AD5696R_17 [ADI]

Quad 16-/14-/12-Bit nanoDAC Reference, I2C Interface;
AD5696R_17
型号: AD5696R_17
厂家: ADI    ADI
描述:

Quad 16-/14-/12-Bit nanoDAC Reference, I2C Interface

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Quad 16-/14-/12-Bit nanoDAC+  
with 2 ppm/°C Reference, I2C Interface  
AD5696R/AD5695R/AD5694R  
Data Sheet  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
High relative accuracy (INL): 2 LSB maximum at 16 bits  
Low drift 2.5 V reference: 2 ppm/°C typical  
Tiny package: 3 mm × 3 mm, 16-lead LFCSP  
Total unadjusted error (TUE): 0.1% of FSR maximum  
Offset error: 1.5 mV maximum  
Gain error: 0.1% of FSR maximum  
High drive capability: 20 mA, 0.5 V from supply rails  
User selectable gain of 1 or 2 (GAIN pin)  
Reset to zero scale or midscale (RSTSEL pin)  
1.8 V logic compatibility  
V
GND  
V
REF  
DD  
2.5V  
AD5696R/AD5695R/AD5694R  
REFERENCE  
V
LOGIC  
SCL  
STRING  
DAC A  
INPUT  
DAC  
V
V
V
V
A
B
C
D
OUT  
OUT  
OUT  
OUT  
REGISTER  
REGISTER  
BUFFER  
BUFFER  
BUFFER  
BUFFER  
STRING  
DAC B  
INPUT  
REGISTER  
DAC  
REGISTER  
SDA  
A1  
STRING  
DAC C  
INPUT  
REGISTER  
DAC  
REGISTER  
Low glitch: 0.5 nV-sec  
400 kHz I2C-compatible serial interface  
Low power: 3.3 mW at 3 V  
A0  
STRING  
DAC D  
INPUT  
REGISTER  
DAC  
REGISTER  
POWER-ON  
RESET  
GAIN =  
×1/×2  
POWER-  
DOWN  
LOGIC  
2.7 V to 5.5 V power supply  
−40°C to +105°C temperature range  
LDAC RESET  
RSTSEL  
GAIN  
APPLICATIONS  
Optical transceivers  
Figure 1.  
Base-station power amplifiers  
Process control (PLC I/O cards)  
Industrial automation  
Data acquisition systems  
GENERAL DESCRIPTION  
The AD5696R/AD5695R/AD5694R family are low power, quad,  
16-/14-/12-bit buffered voltage output DACs. The devices include  
a 2.5 V, 2 ppm/°C internal reference (enabled by default) and a  
gain select pin giving a full-scale output of 2.5 V (gain = 1) or  
5 V (gain = 2). All devices operate from a single 2.7 V to 5.5 V  
supply, are guaranteed monotonic by design, and exhibit less  
than 0.1% FSR gain error and 1.5 mV offset error performance.  
The devices are available in a 3 mm × 3 mm LFCSP and a  
TSSOP package.  
Table 1. Quad nanoDAC+ Devices  
Interface Reference 16-Bit  
14-Bit  
12-Bit  
SPI  
Internal  
External  
Internal  
External  
AD5686R  
AD5686  
AD5696R  
AD5696  
AD5685R AD5684R  
AD5684  
I2C  
AD5695R AD5694R  
AD5694  
PRODUCT HIGHLIGHTS  
The AD5696R/AD5695R/AD5694R also incorporate a power-  
on reset circuit and a RSTSEL pin that ensures that the DAC  
outputs power up to zero scale or midscale and remain there  
until a valid write takes place. Each part contains a per-channel  
power-down feature that reduces the current consumption of  
the device to 4 µA at 3 V while in power-down mode.  
1. High Relative Accuracy (INL).  
AD5696R (16-bit): 2 LSB maximum.  
AD5695R (14-bit): 1 LSB maximum.  
AD5694R (12-bit): 1 LSB maximum.  
2. Low Drift 2.5 V On-Chip Reference.  
2 ppm/°C typical temperature coefficient.  
5 ppm/°C maximum temperature coefficient.  
3. Two Package Options.  
The AD5696R/AD5695R/AD5694R use a versatile 2-wire serial  
interface that operates at clock rates up to 400 kHz, and includes  
a VLOGIC pin intended for 1.8 V/3 V/5 V logic.  
3 mm × 3 mm, 16-lead LFCSP.  
16-lead TSSOP.  
Rev. D  
Document Feedback  
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rightsof third parties that may result fromits use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2012–2017 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
TABLE OF CONTENTS  
Features .............................................................................................. 1  
Serial Operation ......................................................................... 21  
Write Operation.......................................................................... 21  
Read Operation........................................................................... 22  
Multiple DAC Readback Sequence.......................................... 22  
Power-Down Operation............................................................ 23  
Applications....................................................................................... 1  
Functional Block Diagram .............................................................. 1  
General Description......................................................................... 1  
Product Highlights ........................................................................... 1  
Revision History ............................................................................... 2  
Specifications..................................................................................... 3  
AC Characteristics........................................................................ 5  
Timing Characteristics ................................................................ 6  
Absolute Maximum Ratings............................................................ 7  
ESD Caution.................................................................................. 7  
Pin Configuration and Function Descriptions............................. 8  
Typical Performance Characteristics ............................................. 9  
Terminology .................................................................................... 16  
Theory of Operation ...................................................................... 18  
Digital-to-Analog Converter .................................................... 18  
Transfer Function....................................................................... 18  
DAC Architecture....................................................................... 18  
Serial Interface ............................................................................ 19  
Write and Update Commands.................................................. 20  
LDAC  
Load DAC (Hardware  
Pin)........................................... 24  
Mask Register ................................................................. 24  
Hardware Reset ( ) .......................................................... 25  
LDAC  
RESET  
Reset Select Pin (RSTSEL) ........................................................ 25  
Internal Reference Setup ........................................................... 25  
Solder Heat Reflow..................................................................... 25  
Long-Term Temperature Drift ................................................. 25  
Thermal Hysteresis .................................................................... 26  
Applications Information.............................................................. 27  
Microprocessor Interfacing....................................................... 27  
AD5696R/AD5695R/AD5694R to ADSP-BF531 Interface .... 27  
Layout Guidelines....................................................................... 27  
Galvanically Isolated Interface ................................................. 27  
Outline Dimensions....................................................................... 28  
Ordering Guide .......................................................................... 29  
REVISION HISTORY  
4/2017—Rev. C to Rev. D  
5/2014—Rev. B to Rev. C  
Changes to Features Section............................................................ 1  
Changes to Specifications Section.................................................. 3  
Changes to VLOGIC Parameter, Table 1 ............................................ 4  
Changes to AC Characteristics Section and Output Noise  
Spectral Density Parameter, Table 3............................................... 5  
Changes to Timing Characteristics Section.................................. 6  
Changes to Table 5............................................................................ 7  
Deleted Long-Term Stability Drift Parameter, Table 1.................4  
Deleted Figure 8; Renumbered Sequentially .................................9  
Changes to Read Operation Section and Figure 51................... 22  
Deleted Long-Term Temperature Drift Section......................... 25  
6/2013—Rev. A to Rev. B  
Changes to Pin GAIN and Pin RSTSEL Descriptions; Table 6 ...8  
RESET  
Changes to VLOGIC Pin Description and  
Pin Description,  
11/2012—Rev. 0 to Rev. A  
Table 6 ................................................................................................ 8  
Changes to Figure 18 to Figure 22................................................ 11  
Changes to Figure 23 to Figure 26 and Figure 28 ...................... 12  
Changes to Figure 29, Figure 32, and Figure 34......................... 13  
Changes to Figure 39 and Figure 40............................................. 14  
Changes to Figure 50...................................................................... 21  
Changes to Figure 51...................................................................... 22  
Changes to Table 1.............................................................................1  
Changes to Table 4.............................................................................6  
Changes to Figure 10.........................................................................9  
Changes to Figure 33...................................................................... 13  
Changes to Serial Interface Section.............................................. 19  
Changes to Figure 52...................................................................... 22  
RESET  
Changes to Hardware Reset (  
) Section............................ 25  
4/2012—Revision 0: Initial Version  
Added Long-Term Temperature Drift Section and Figure 55;  
Renumbered Sequentially...................................................................25  
Changes to Ordering Guide................................................................29  
Rev. D | Page 2 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
SPECIFICATIONS  
VDD = 2.7 V to 5.5 V; 1.62 V ≤ VLOGIC ≤ 5.5 V; all specifications TMIN to TMAX, unless otherwise noted. RL = 2 kΩ; CL = 200 pF.  
Table 2.  
B Grade1  
Typ  
A Grade1  
Typ  
Parameter  
Min  
Max  
Min  
Max  
Unit  
Test Conditions/Comments  
STATIC PERFORMANCE2  
AD5696R  
Resolution  
16  
16  
Bits  
LSB  
Relative Accuracy  
±2  
±2  
±±  
±±  
±1  
±1  
±1  
±2  
±3  
±1  
Gain = 2  
Gain = 1  
Differential Nonlinearity  
AD5695R  
LSB  
Guaranteed monotonic by design  
Resolution  
14  
12  
14  
12  
Bits  
LSB  
LSB  
Relative Accuracy  
Differential Nonlinearity  
AD5694R  
±ꢀ.5  
±4  
±1  
±ꢀ.5  
±1  
±1  
Guaranteed monotonic by design  
Resolution  
Bits  
LSB  
LSB  
mV  
mV  
Relative Accuracy  
Differential Nonlinearity  
Zero-Code Error  
Offset Error  
±ꢀ.12 ±2  
±1  
±ꢀ.12 ±1  
±1  
Guaranteed monotonic by design  
All zeros loaded to DAC register  
ꢀ.4  
4
ꢀ.4  
1.5  
+ꢀ.1  
±4  
+ꢀ.1  
±1.5  
Full-Scale Error  
+ꢀ.ꢀ1 ±ꢀ.2  
±ꢀ.ꢀ2 ±ꢀ.2  
±ꢀ.ꢀ1 ±ꢀ.25  
±ꢀ.25  
+ꢀ.ꢀ1 ±ꢀ.1  
±ꢀ.ꢀ2 ±ꢀ.1  
±ꢀ.ꢀ1 ±ꢀ.1  
±ꢀ.2  
% of  
FSR  
All ones loaded to DAC register  
Gain Error  
% of  
FSR  
Total Unadjusted Error  
% of  
FSR  
External reference; gain = 2; TSSOP  
Internal reference; gain = 1; TSSOP  
% of  
FSR  
Offset Error Drift3  
±1  
±1  
±1  
±1  
μV/°C  
ppm  
Gain Temperature  
Coefficient3  
Of FSR/°C  
DC Power Supply Rejection  
Ratio3  
ꢀ.15  
ꢀ.15  
mV/V  
DAC code = midscale; VDD = 5 V ± 1ꢀ%  
DC Crosstalk3  
±2  
±2  
μV  
Due to single channel, full-scale  
output change  
±3  
±2  
±3  
±2  
μV/mA  
μV  
Due to load current change  
Due to powering down (per channel)  
OUTPUT CHARACTERISTICS3  
Output Voltage Range  
VREF  
VREF  
V
Gain = 1  
2 × VREF  
2 × VREF  
V
Gain = 2, see Figure 3ꢀ  
RL = ∞  
Capacitive Load Stability  
2
2
nF  
1ꢀ  
1ꢀ  
nF  
RL = 1 kΩ  
Resistive Load4  
Load Regulation  
1
1
kΩ  
±ꢀ  
±ꢀ  
±ꢀ  
±ꢀ  
μV/mA  
5 V ± 1ꢀ%, DAC code = midscale;  
−3ꢀ mA ≤ IOUT ≤ 3ꢀ mA  
μV/mA  
3 V ± 1ꢀ%, DAC code = midscale;  
−2ꢀ mA ≤ IOUT ≤ 2ꢀ mA  
Short-Circuit Current5  
Load Impedance at Rails6  
Power-Up Time  
4ꢀ  
25  
2.5  
4ꢀ  
25  
2.5  
mA  
Ω
See Figure 3ꢀ  
μs  
Coming out of power-down mode;  
VDD = 5 V  
Rev. D | Page 3 of 29  
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
B Grade1  
Typ  
A Grade1  
Typ  
Parameter  
Min  
Max  
Min  
Max  
Unit  
Test Conditions/Comments  
REFERENCE OUTPUT  
Output Voltage7  
Reference TC8, 9  
Output Impedance3  
Output Voltage Noise3  
2.4975  
2.5025  
20  
2.4975  
2.5025  
5
V
At ambient  
5
2
ppm/°C  
Ω
See the Terminology section  
0.04  
12  
0.04  
12  
0.1 Hz to 10 Hz  
µV p-p  
Output Voltage Noise  
Density3  
240  
240  
nV/√Hz  
At ambient; f = 10 kHz, CL = 10 nF  
Load Regulation Sourcing3  
Load Regulation Sinking3  
At ambient  
At ambient  
VDD ≥ 3 V  
20  
40  
±5  
20  
40  
±5  
µV/mA  
µV/mA  
mA  
Output Current Load  
Capability3  
Line Regulation3  
Thermal Hysteresis3  
100  
125  
25  
100  
125  
25  
μV/V  
ppm  
ppm  
At ambient  
First cycle  
Additional cycles  
LOGIC INPUTS3  
Input Current  
2
2
μA  
V
Per pin  
VINL, Input Low Voltage  
VINH, Input High Voltage  
Pin Capacitance  
0.3 × VLOGIC  
0.3 × VLOGIC  
0.7 × VLOGIC  
0.7 × VLOGIC  
V
2
4
2
4
pF  
LOGIC OUTPUTS (SDA)3  
Output Low Voltage, VOL  
0.4  
0.4  
V
ISINK = 3 mA  
Floating State Output  
Capacitance  
pF  
POWER REQUIREMENTS  
VLOGIC  
1.62  
5.5  
3
1.62  
5.5  
3
V
ILOGIC  
µA  
V
VDD  
2.7  
5.5  
5.5  
2.7  
5.5  
5.5  
Gain = 1  
VDD  
VREF + 1.5  
VREF + 1.5  
V
Gain = 2  
IDD  
VIH = VDD, VIL = GND, VDD = 2.7 V to 5.5 V  
Internal reference off  
Internal reference on, at full scale  
−40°C to +85°C  
Normal Mode10  
0.59  
1.1  
1
0.7  
1.3  
4
0.59  
1.1  
1
0.7  
1.3  
4
mA  
mA  
μA  
All Power-Down Modes11  
6
6
μA  
−40°C to +105°C  
1 Temperature range: A and B grade: −40°C to +105°C.  
2 DC specifications tested with the outputs unloaded, unless otherwise noted. Upper dead band = 10 mV and exists only when VREF = VDD with gain = 1 or when VREF/2 =  
V
DD with gain = 2. Linearity calculated using a reduced code range of 256 to 65,280 (AD5696R), 64 to 16,320 (AD5695R), and 12 to 4080 (AD5694R).  
3 Guaranteed by design and characterization; not production tested.  
4 Channel A and Channel B can have a combined output current of up to 30 mA. Similarly, Channel C and Channel D can have a combined output current of up to  
30 mA up to a junction temperature of 110°C.  
5 VDD = 5 V. The device includes current limiting that is intended to protect the device during temporary overload conditions. Junction temperature can be exceeded  
during current limit. Operation above the specified maximum operation junction temperature may impair device reliability.  
6 When drawing a load current at either rail, the output voltage headroom with respect to that rail is limited by the 25 Ω typical channel resistance of the output  
devices. For example, when sinking 1 mA, the minimum output voltage = 25 Ω × 1 mA = 25 mV (see Figure 30).  
7 Initial accuracy presolder reflow is 750 μV; output voltage includes the effects of preconditioning drift. See the Internal Reference Setup section.  
8 Reference is trimmed and tested at two temperatures and is characterized from −40°C to +105°C.  
9 Reference temperature coefficient calculated as per the box method. See the Terminology section for further information.  
10 Interface inactive. All DACs active. DAC outputs unloaded.  
11 All DACs powered down.  
Rev. D | Page 4 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
AC CHARACTERISTICS  
VDD = 2.7 V to 5.5 V; RL = 2 kΩ to GND; CL = 200 pF to GND; 1.62 V ≤ VLOGIC ≤ 5.5 V; all specifications TMIN to TMAX, unless otherwise noted.1  
Table 3.  
Parameter2  
Min  
Typ  
Max  
Unit  
Test Conditions/Comments3  
Output Voltage Settling Time  
AD5696R  
AD5695R  
5
5
5
8
8
7
µs  
µs  
µs  
¼ to ¾ scale settling to 2 LSB  
¼ to ¾ scale settling to 2 LSB  
¼ to ¾ scale settling to 2 LSB  
AD5694R  
Slew Rate  
0.8  
0.5  
0.13  
0.1  
0.2  
0.3  
−80  
300  
V/µs  
Digital-to-Analog Glitch Impulse  
Digital Feedthrough  
Digital Crosstalk  
nV-sec  
nV-sec  
nV-sec  
nV-sec  
nV-sec  
dB  
1 LSB change around major carry  
Analog Crosstalk  
DAC-to-DAC Crosstalk  
Total Harmonic Distortion4  
Output Noise Spectral Density  
At ambient, BW = 20 kHz, VDD = 5 V, fOUT = 1 kHz  
DAC code = midscale, 10 kHz; gain = 2,  
internal reference  
nV/√Hz  
Output Noise  
SNR  
SFDR  
6
µV p-p  
dB  
dB  
0.1 Hz to 10 Hz  
90  
83  
80  
At ambient, BW = 20 kHz, VDD = 5 V, fOUT = 1 kHz  
At ambient, BW = 20 kHz, VDD = 5 V, fOUT = 1 kHz  
At ambient, BW = 20 kHz, VDD = 5 V, fOUT = 1 kHz  
SINAD  
dB  
1 Guaranteed by design and characterization; not production tested.  
2 See the Terminology section.  
3 Temperature range is −40°C to +105°C, typical at 25°C.  
4 Digitally generated sine wave at 1 kHz.  
Rev. D | Page 5 of 29  
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
TIMING CHARACTERISTICS  
VDD = 2.5 V to 5.5 V; 1.62 V ≤ VLOGIC ≤ 5.5 V; all specifications TMIN to TMAX, unless otherwise noted. 1  
Table 4.  
Parameter2  
Unit  
μs  
μs  
μs  
μs  
ns  
μs  
μs  
μs  
μs  
ns  
ns  
ns  
ns  
ns  
pF  
Conditions/Comments  
SCL cycle time  
tHIGH, SCL high time  
tLOW, SCL low time  
tHD,STA, start/repeated start condition hold time  
tSU,DAT, data setup time  
tHD,DAT, data hold time  
tSU,STA, setup time for repeated start  
tSU,STO, stop condition setup time  
tBUF, bus free time between a stop and a start condition  
tR, rise time of SCL and SDA when receiving  
tF, fall time of SDA and SCL when transmitting/ receiving  
LDAC pulse width  
Min  
2.5  
0.6  
1.3  
0.6  
100  
0
0.6  
0.6  
1.3  
0
Max  
t1  
t2  
t3  
t4  
t5  
3
t6  
0.9  
t7  
t8  
t9  
t10  
t11  
t12  
t13  
300  
300  
4
20 + 0.1CB  
20  
400  
0
SCL rising edge to LDAC rising edge  
Pulse width of suppressed spike  
Capacitive load for each bus line  
5
tSP  
CB  
50  
400  
4
1 See Figure 2.  
2 Guaranteed by design and characterization; not production tested.  
3 A master device must provide a hold time of at least 300 ns for the SDA signal (referred to the VIH min of the SCL signal) to bridge the undefined region of SCL’s  
falling edge.  
4 CB is the total capacitance of one bus line in pF. tR and tF measured between 0.3 VDD and 0.7 VDD  
Input filtering on the SCL and SDA inputs suppresses noise spikes that are less than 50 ns.  
.
5
START  
CONDITION  
REPEATED START  
CONDITION  
STOP  
CONDITION  
SDA  
SCL  
t9  
t10  
t11  
t4  
t3  
t4  
t2  
t1  
t6  
t5  
t7  
t8  
t12  
1
2
t13  
LDAC  
LDAC  
t12  
NOTES  
1
ASYNCHRONOUS LDAC UPDATE MODE.  
SYNCHRONOUS LDAC UPDATE MODE.  
2
Figure 2. 2-Wire Serial Interface Timing Diagram  
Rev. D | Page 6 of 29  
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
ABSOLUTE MAXIMUM RATINGS  
TA = 25°C, unless otherwise noted.  
Stresses at or above those listed under Absolute Maximum  
Ratings may cause permanent damage to the product. This is a  
stress rating only; functional operation of the product at these  
or any other conditions above those indicated in the operational  
section of this specification is not implied. Operation beyond  
the maximum operating conditions for extended periods may  
affect product reliability.  
Table 5.  
Parameter  
Rating  
VDD to GND  
VLOGIC to GND  
VOUT to GND  
VREF to GND  
Digital Input Voltage to GND1  
SDA and SCL to GND  
Operating Temperature Range  
Storage Temperature Range  
Junction Temperature  
−0.3 V to +7 V  
−0.3 V to +7 V  
−0.3 V to VDD + 0.3 V  
−0.3 V to VDD + 0.3 V  
−0.3 V to VLOGIC + 0.3 V  
−0.3 V to +7 V  
−40°C to +105°C  
−65°C to +150°C  
125°C  
ESD CAUTION  
16-Lead TSSOP, θJA Thermal  
112.6°C/W  
Impedance, 0 Airflow (4-Layer Board)  
16-Lead LFCSP, θJA Thermal  
Impedance, 0 Airflow (4-Layer Board)  
Reflow Soldering Peak  
70°C/W  
260°C  
Temperature, Pb Free (J-STD-020)  
1 Excluding SDA and SCL.  
Rev. D | Page 7 of 29  
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS  
AD5696R/AD5695R/AD5694R  
V
V
A 1  
12 A1  
11 SCL  
10 A0  
OUT  
GND 2  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
V
RSTSEL  
RESET  
A1  
REF  
V
3
4
DD  
V
V
B
A
OUT  
9
V
AD5696R/  
AD5695R/  
AD5694R  
TOP VIEW  
(Not to Scale)  
C
OUT  
LOGIC  
OUT  
GND  
SCL  
V
A0  
DD  
V
V
C
D
V
LOGIC  
OUT  
TOP VIEW  
(Not to Scale)  
GAIN  
LDAC  
OUT  
SDA  
NOTES  
1. THE EXPOSED PAD MUST BE TIED TO GND.  
Figure 3. 16-Lead LFCSP Pin Configuration  
Figure 4. 16-Lead TSSOP Pin Configuration  
Table 6. Pin Function Descriptions  
Pin No.  
TSSOP  
LFCSP  
Mnemonic Description  
1
2
3
3
4
5
VOUT  
GND  
VDD  
A
Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.  
Ground Reference Point for All Circuitry on the Part.  
Power Supply Input. These parts can be operated from 2.7 V to 5.5 V, and the supply should be  
decoupled with a 10 μF capacitor in parallel with a 0.1 μF capacitor to GND.  
4
5
6
6
7
8
VOUT  
VOUT  
SDA  
C
D
Analog Output Voltage from DAC C. The output amplifier has rail-to-rail operation.  
Analog Output Voltage from DAC D. The output amplifier has rail-to-rail operation.  
Serial Data Input. This pin is used in conjunction with the SCL line to clock data into or out of the  
24-bit input shift register. SDA is a bidirectional, open-drain data line that should be pulled to the  
supply with an external pull-up resistor.  
7
8
9
LDAC  
GAIN  
LDAC can be operated in two modes, asynchronously and synchronously. Pulsing this pin low allows  
any or all DAC registers to be updated if the input registers have new data. This allows all DAC outputs  
to simultaneously update. This pin can also be tied permanently low.  
10  
Span Set Pin. When this pin is tied to GND, all four DAC outputs have a span from 0 V to VREF. If this  
pin is tied to VLOGIC, all four DACs output a span of 0 V to 2 × VREF  
Digital Power Supply. Voltage ranges from 1.62 V to 5.5 V.  
Address Input. Sets the first LSB of the 7-bit slave address.  
Serial Clock Line. This is used in conjunction with the SDA line to clock data into or out of the 24-bit  
input register.  
.
9
10  
11  
11  
12  
13  
VLOGIC  
A0  
SCL  
12  
13  
14  
15  
A1  
RESET  
Address Input. Sets the second LSB of the 7-bit slave address.  
Asynchronous Reset Input. The RESET input is falling edge sensitive. When RESET is low, all LDAC  
pulses are ignored. When RESET is activated, the input register and the DAC register are updated  
with zero scale or midscale, depending on the state of the RSTSEL pin. If the pin is forced low at  
power-up, the POR circuit does not initialize correctly until the pin is released.  
14  
15  
16  
1
RSTSEL  
VREF  
Power-On Reset Pin. Tying this pin to GND powers up all four DACs to zero scale. Tying this pin to  
VLOGIC powers up all four DACs to midscale.  
Reference Voltage. The AD5696R/AD5695R/AD5694R have a common reference pin. When using  
the internal reference, this is the reference output pin. When using an external reference, this is the  
reference input pin. The default for this pin is as a reference output.  
16  
17  
2
N/A  
VOUT  
EPAD  
B
Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.  
Exposed Pad. The exposed pad must be tied to GND.  
Rev. D | Page 8 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
TYPICAL PERFORMANCE CHARACTERISTICS  
2.5020  
1600  
1400  
1200  
1000  
800  
600  
400  
200  
0
V
= 5V  
= 25°C  
DD  
DEVICE 1  
DEVICE 2  
DEVICE 3  
DEVICE 4  
DEVICE 5  
V
= 5V  
DD  
T
A
2.5015  
2.5010  
2.5005  
2.5000  
2.4995  
2.4990  
2.4985  
2.4980  
–40  
–20  
0
20  
40  
60  
80  
100  
120  
10  
100  
1k  
10k  
100k  
1M  
TEMPERATURE (°C)  
FREQUENCY (MHz)  
Figure 5. Internal Reference Voltage vs. Temperature (Grade B)  
Figure 8. Internal Reference Noise Spectral Density vs. Frequency  
2.5020  
DEVICE 1  
V
= 5V  
= 25°C  
T
DD  
DEVICE 2  
DEVICE 3  
T
A
2.5015  
DEVICE 4  
DEVICE 5  
2.5010  
2.5005  
2.5000  
2.4995  
2.4990  
2.4985  
2.4980  
1
V
= 5V  
120  
DD  
–40  
–20  
0
20  
40  
60  
80  
100  
CH1 2µV  
M1.0s  
A CH1  
160mV  
TEMPERATURE (°C)  
Figure 9. Internal Reference Noise, 0.1 Hz to 10 Hz  
Figure 6. Internal Reference Voltage vs. Temperature (Grade A)  
2.5000  
2.4999  
2.4998  
2.4997  
2.4996  
2.4995  
2.4994  
2.4993  
90  
V
= 5V  
= 25°C  
V
= 5V  
DD  
DD  
T
A
80  
70  
60  
50  
40  
30  
20  
10  
0
–0.005  
–0.003  
–0.001  
0.001  
(A)  
0.003  
0.005  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
I
LOAD  
TEMPERATURE DRIFT (ppm/°C)  
Figure 10. Internal Reference Voltage vs. Load Current  
Figure 7. Reference Output Temperature Drift Histogram  
Rev. D | Page 9 of 29  
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
2.5002  
10  
8
T
= 25°C  
A
D1  
2.5000  
6
4
2.4998  
2
D3  
2.4996  
2.4994  
0
–2  
–4  
–6  
–8  
–10  
2.4992  
V
= 5V  
DD  
D2  
T
= 25°C  
A
INTERNAL REFERENCE = 2.5V  
2.4990  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
5.5  
0
625  
1250  
1875  
CODE  
2500  
3125  
3750 4096  
V
(V)  
DD  
Figure 14. AD5694R INL  
Figure 11. Internal Reference Voltage vs. Supply Voltage  
1.0  
0.8  
10  
8
6
0.6  
0.4  
4
0.2  
2
0
0
–0.2  
–0.4  
–0.6  
–0.8  
–1.0  
–2  
–4  
–6  
–8  
–10  
V = 5V  
DD  
V
= 5V  
= 25°C  
DD  
T = 25°C  
T
A
A
INTERNAL REFERENCE = 2.5V  
10000 20000 30000  
CODE  
INTERNAL REFERENCE = 2.5V  
10000 20000 30000  
CODE  
0
40000  
50000  
60000  
0
40000  
50000  
60000  
Figure 15. AD5696R DNL  
Figure 12. AD5696R INL  
1.0  
0.8  
0.6  
0.4  
0.2  
0
10  
8
6
4
2
0
–0.2  
–2  
–4  
–6  
–8  
–10  
–0.4  
–0.6  
–0.8  
–1.0  
V = 5V  
DD  
V
= 5V  
= 25°C  
DD  
T = 25°C  
T
A
A
INTERNAL REFERENCE = 2.5V  
2500 5000 7500  
CODE  
INTERNAL REFERENCE = 2.5V  
2500 5000 7500  
CODE  
0
10000  
12500  
15000 16383  
0
10000  
12500  
15000 16348  
Figure 16. AD5695R DNL  
Figure 13. AD5695R INL  
Rev. D | Page 10 of 29  
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
1.0  
0.8  
10  
8
0.6  
6
0.4  
4
0.2  
2
INL  
0
0
DNL  
–0.2  
–0.4  
–0.6  
–2  
–4  
–6  
–8  
–10  
V
= 5V  
= 25°C  
DD  
–0.8  
–1.0  
T
= 25°C  
A
T
A
INTERNAL REFERENCE = 2.5V  
INTERNAL REFERENCE = 2.5V  
2.7 3.2 3.7  
SUPPLY VOLTAGE (V)  
0
625  
1250  
1875  
CODE  
2500  
3125  
3750 4096  
4.2  
4.7  
5.2  
Figure 17. AD5694R DNL  
Figure 20. INL Error and DNL Error vs. Supply Voltage  
10  
8
0.10  
0.08  
0.06  
0.04  
0.02  
0
6
4
FULL-SCALE ERROR  
GAIN ERROR  
2
INL  
0
DNL  
–0.02  
–0.04  
–0.06  
–0.08  
–0.10  
–2  
–4  
–6  
–8  
–10  
V
= 5V  
V
= 5V  
DD  
DD  
INTERNAL REFERENCE = 2.5V  
INTERNAL REFERENCE = 2.5V  
–40 –20 20 40  
TEMPERATURE (°C)  
–40 10  
60  
110  
0
60  
80  
100  
120  
TEMPERATURE (°C)  
Figure 18. INL Error and DNL Error vs. Temperature  
Figure 21. Gain Error and Full-Scale Error vs. Temperature  
10  
8
V
= 5V  
DD  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
INTERNAL REFERENCE = 2.5V  
6
4
2
INL  
0
DNL  
–2  
–4  
–6  
–8  
–10  
ZERO-CODE ERROR  
OFFSET ERROR  
V
= 5V  
= 25°C  
DD  
T
A
–40  
–20  
0
20  
40  
60  
80  
100  
120  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
TEMPERATURE (°C)  
V
(V)  
REF  
Figure 22. Zero-Code Error and Offset Error vs. Temperature  
Figure 19. INL Error and DNL Error vs. VREF  
Rev. D | Page 11 of 29  
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
0.10  
0.08  
0.06  
0.04  
0.02  
0
0.10  
0.08  
0.06  
0.04  
0.02  
0
GAIN ERROR  
FULL-SCALE ERROR  
–0.02  
–0.04  
–0.06  
–0.08  
–0.10  
–0.02  
–0.04  
–0.06  
–0.08  
–0.10  
T
= 25°C  
T
= 25°C  
A
A
INTERNAL REFERENCE = 2.5V  
2.7 3.2 3.7  
SUPPLY VOLTAGE (V)  
INTERNAL REFERENCE = 2.5V  
2.7 3.2 3.7  
SUPPLY VOLTAGE (V)  
4.2  
4.7  
5.2  
4.2  
4.7  
5.2  
Figure 23. Gain Error and Full-Scale Error vs. Supply  
Figure 26. TUE vs. Supply, Gain = 1  
1.5  
1.0  
0
–0.01  
–0.02  
–0.03  
–0.04  
–0.05  
–0.06  
–0.07  
–0.08  
–0.09  
–0.10  
0.5  
ZERO-CODE ERROR  
OFFSET ERROR  
0
–0.5  
–1.0  
–1.5  
V
= 5V  
DD  
T
= 25°C  
A
T
= 25°C  
A
INTERNAL REFERENCE = 2.5V  
INTERNAL REFERENCE = 2.5V  
2.7  
3.2  
3.7  
4.2  
4.7  
5.2  
0
10000  
20000  
30000  
CODE  
40000  
50000  
60000 65535  
SUPPLY VOLTAGE (V)  
Figure 24. Zero-Code Error and Offset Error vs. Supply  
Figure 27. TUE vs. Code  
0.10  
0.09  
0.08  
0.07  
0.06  
0.05  
0.04  
0.03  
0.02  
0.01  
0
V
= 5V  
= 25°C  
DD  
V
= 5V  
DD  
25  
T
A
INTERNAL REFERENCE = 2.5V  
EXTERNAL  
REFERENCE = 2.5V  
20  
15  
10  
5
0
540  
560  
580  
600  
620  
640  
–40  
–20  
0
20  
40  
60  
80  
100  
120  
I
(µA)  
DD  
TEMPERATURE (°C)  
Figure 28. IDD Histogram with External Reference, 5 V  
Figure 25. TUE vs. Temperature  
Rev. D | Page 12 of 29  
Data Sheet  
AD5696R/AD5695R/AD5694R  
5
4
V
= 5V  
= 25°C  
DD  
V
= 3V  
= 25°C  
30  
25  
20  
15  
10  
5
DD  
T
A
T
A
INTERNAL  
REFERENCE = 2.5V  
GAIN = 1  
EXTERNAL  
REFERENCE = 2.5V  
3
0xFFFF  
0xC000  
0x8000  
0x4000  
2
1
0x0000  
0
–1  
0
–2  
–60  
1000  
1020  
1040  
1060  
1080  
1100  
1120  
1140  
–40  
–20  
0
20  
40  
60  
I
FULLSCALE (µA)  
DD  
I
(mA)  
OUT  
Figure 29. IDD Histogram with Internal Reference, VREFOUT = 2.5 V, Gain = 2  
Figure 32. Source and Sink Capability at 3 V  
1.0  
0.8  
0.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
FULL-SCALE  
ZERO CODE  
0.4  
SINKING 2.7V  
0.2  
SINKING 5V  
0
EXTERNAL REFERENCE, FULL-SCALE  
–0.2  
SOURCING 5V  
–0.4  
–0.6  
–0.8  
–1.0  
SOURCING 2.7V  
15  
–40  
10  
60  
110  
0
5
10  
20  
25  
30  
TEMPERATURE (°C)  
LOAD CURRENT (mA)  
Figure 33. Supply Current vs. Temperature  
Figure 30. Headroom/Footroom vs. Load Current  
4.0  
7
6
DAC A  
DAC B  
DAC C  
DAC D  
V
= 5V  
DD  
= 25°C  
T
A
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
GAIN = 2  
INTERNAL  
REFERENCE = 2.5V  
0xFFFF  
5
4
0xC000  
0x8000  
0x4000  
0x0000  
3
2
1
0
V
T
= 5V  
= 25°C  
DD  
A
–1  
–2  
INTERNAL REFERENCE = 2.5V  
¼ TO ¾ SCALE  
0
20  
40  
80  
160  
320  
–0.06  
–0.04  
–0.02  
0
0.02  
0.04  
0.06  
TIME (µs)  
LOAD CURRENT (A)  
Figure 34. Settling Time, 5.25 V  
Figure 31. Source and Sink Capability at 5 V  
Rev. D | Page 13 of 29  
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
0.06  
6
0.003  
0.002  
0.001  
0
CH A  
CH B  
CH C  
CH B  
CH C  
CH D  
0.05  
5
CH D  
V
DD  
0.04  
0.03  
0.02  
0.01  
0
4
3
2
1
–0.001  
–0.002  
0
T
= 25°C  
A
INTERNAL REFERENCE = 2.5V  
–0.01  
–1  
–10  
–5  
0
5
10  
15  
0
5
10  
15  
20  
25  
TIME (µs)  
TIME (µs)  
Figure 35. Power-On Reset to 0 V  
Figure 38. Analog Crosstalk, Channel A  
3
CH A  
CH B  
CH C  
CH D  
SYNC  
T
GAIN = 2  
2
1
0
GAIN = 1  
1
V
= 5V  
= 25°C  
DD  
V
= 5V  
= 25°C  
DD  
T
A
T
A
INTERNAL REFERENCE = 2.5V  
EXTERNAL REFERENCE = 2.5V  
–5  
0
5
10  
TIME (µs)  
CH1 2µV M1.0s  
A
CH1  
802mV  
Figure 36. Exiting Power-Down to Midscale  
Figure 39. 0.1 Hz to 10 Hz Output Noise Plot, External Reference  
2.5008  
2.5003  
2.4998  
2.4993  
2.4988  
T
1
CHANNEL B  
= 25°C  
T
A
V
= 5.25V  
DD  
INTERNAL REFERENCE  
CODE = 7FFF TO 8000  
ENERGY = 0.227206nV-sec  
V
= 5V  
= 25°C  
DD  
T
A
INTERNAL REFERENCE = 2.5V  
0
2
4
6
8
10  
12  
TIME (µs)  
CH1 2µV M1.0s  
A CH1  
802mV  
Figure 37. Digital-to-Analog Glitch Impulse  
Figure 40. 0.1 Hz to 10 Hz Output Noise Plot, 2.5 V Internal Reference  
Rev. D | Page 14 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
1600  
4.0  
3.9  
3.8  
3.7  
3.6  
3.5  
3.4  
3.3  
3.2  
3.1  
3.0  
0nF  
V
T
= 5V  
= 25°C  
V
T
= 5V  
DD  
DD  
FULL-SCALE  
MIDSCALE  
ZERO-SCALE  
0.1nF  
10nF  
0.22nF  
4.7nF  
= 25°C  
A
A
1400  
1200  
1000  
800  
600  
400  
200  
0
INTERNAL REFERENCE = 2.5V  
INTERNAL REFERENCE = 2.5V  
10  
100  
1k  
10k  
100k  
1M  
1.590 1.595 1.600 1.605 1.610 1.615 1.620 1.625 1.630  
FREQUENCY (Hz)  
TIME (ms)  
Figure 41. Noise Spectral Density  
Figure 43. Settling Time vs. Capacitive Load  
20  
0
0
V
= 5V  
= 25°C  
DD  
T
A
INTERNAL REFERENCE = 2.5V  
–10  
–20  
–40  
–20  
–30  
–40  
–50  
–60  
–60  
–80  
–100  
–120  
–140  
–160  
–180  
V
= 5V  
DD  
T
= 25°C  
A
EXTERNAL REFERENCE = 2.5V, ±0.1V p-p  
10k 100k 1M  
FREQUENCY (Hz)  
0
2000 4000 6000 8000 10000 12000 14000 16000 18000 20000  
FREQUENCY (Hz)  
10M  
Figure 42. Total Harmonic Distortion at 1 kHz  
Figure 44. Multiplying Bandwidth, External Reference = 2.5 V, 0.1 V p-p,  
10 kHz to 10 MHz  
Rev. D | Page 15 of 29  
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
TERMINOLOGY  
Relative Accuracy or Integral Nonlinearity (INL)  
For the DAC, relative accuracy or integral nonlinearity is a  
measurement of the maximum deviation, in LSBs, from a  
straight line passing through the endpoints of the DAC transfer  
function. A typical INL vs. code plot is shown in Figure 12.  
Output Voltage Settling Time  
This is the amount of time it takes for the output of a DAC to  
settle to a specified level for a ¼ to ¾ full-scale input change.  
Digital-to-Analog Glitch Impulse  
Digital-to-analog glitch impulse is the impulse injected into the  
analog output when the input code in the DAC register changes  
state. It is normally specified as the area of the glitch in nV-sec,  
and is measured when the digital input code is changed by  
1 LSB at the major carry transition (0x7FFF to 0x8000) (see  
Figure 37).  
Differential Nonlinearity (DNL)  
Differential nonlinearity is the difference between the measured  
change and the ideal 1 LSB change between any two adjacent  
codes. A specified differential nonlinearity of 1 LSB maximum  
ensures monotonicity. This DAC is guaranteed monotonic by  
design. A typical DNL vs. code plot can be seen in Figure 15.  
Digital Feedthrough  
Zero-Code Error  
Digital feedthrough is a measure of the impulse injected into the  
analog output of the DAC from the digital inputs of the DAC,  
but is measured when the DAC output is not updated. It is  
specified in nV-sec, and measured with a full-scale code change  
on the data bus, that is, from all 0s to all 1s and vice versa.  
Zero-code error is a measurement of the output error when  
zero code (0x0000) is loaded to the DAC register. Ideally, the  
output should be 0 V. The zero-code error is always positive in  
the AD5696R because the output of the DAC cannot go below  
0 V due to a combination of the offset errors in the DAC and  
the output amplifier. Zero-code error is expressed in mV. A plot  
of zero-code error vs. temperature can be seen in Figure 22.  
Reference Feedthrough  
Reference feedthrough is the ratio of the amplitude of the signal  
at the DAC output to the reference input when the DAC output  
is not being updated. It is expressed in dB.  
Full-Scale Error  
Full-scale error is a measurement of the output error when full-  
scale code (0xFFFF) is loaded to the DAC register. Ideally, the  
output should be VDD − 1 LSB. Full-scale error is expressed in  
percent of full-scale range (% of FSR). A plot of full-scale error  
vs. temperature can be seen in Figure 21.  
Noise Spectral Density  
This is a measurement of the internally generated random  
noise. Random noise is characterized as a spectral density  
(nV/√Hz). It is measured by loading the DAC to midscale and  
measuring noise at the output. It is measured in nV/√Hz. A plot  
of noise spectral density is shown in Figure 41.  
Gain Error  
This is a measure of the span error of the DAC. It is the deviation  
in slope of the DAC transfer characteristic from the ideal  
expressed as % of FSR.  
DC Crosstalk  
DC crosstalk is the dc change in the output level of one DAC in  
response to a change in the output of another DAC. It is  
measured with a full-scale output change on one DAC (or soft  
power-down and power-up) while monitoring another DAC kept  
at midscale. It is expressed in μV.  
Offset Error Drift  
This is a measurement of the change in offset error with a  
change in temperature. It is expressed in µV/°C.  
Gain Temperature Coefficient  
This is a measurement of the change in gain error with changes  
in temperature. It is expressed in ppm of FSR/°C.  
DC crosstalk due to load current change is a measure of the  
impact that a change in load current on one DAC has to  
another DAC kept at midscale. It is expressed in μV/mA.  
Offset Error  
Digital Crosstalk  
Offset error is a measure of the difference between VOUT (actual)  
and VOUT (ideal) expressed in mV in the linear region of the  
transfer function. Offset error is measured on the AD5696R  
with Code 512 loaded in the DAC register. It can be negative  
or positive.  
This is the glitch impulse transferred to the output of one DAC  
at midscale in response to a full-scale code change (all 0s to all  
1s and vice versa) in the input register of another DAC. It is  
measured in standalone mode and is expressed in nV-sec.  
DC Power Supply Rejection Ratio (PSRR)  
This indicates how the output of the DAC is affected by changes  
in the supply voltage. PSRR is the ratio of the change in VOUT to  
a change in VDD for full-scale output of the DAC. It is measured  
in mV/V. VREF is held at 2 V, and VDD is varied by 10%.  
Rev. D | Page 16 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
Analog Crosstalk  
Total Harmonic Distortion (THD)  
This is the glitch impulse transferred to the output of one DAC  
due to a change in the output of another DAC. It is measured by  
loading one of the input registers with a full-scale code change  
(all 0s to all 1s and vice versa). Then execute a software LDAC  
and monitor the output of the DAC whose digital code was not  
changed. The area of the glitch is expressed in nV-sec.  
This is the difference between an ideal sine wave and its  
attenuated version using the DAC. The sine wave is used as the  
reference for the DAC, and the THD is a measurement of the  
harmonics present on the DAC output. It is measured in dB.  
Voltage Reference TC  
Voltage reference TC is a measure of the change in the reference  
output voltage with a change in temperature. The reference TC  
is calculated using the box method, which defines the TC as the  
maximum change in the reference output over a given tempera-  
ture range expressed in ppm/°C as follows;  
DAC-to-DAC Crosstalk  
This is the glitch impulse transferred to the output of one DAC  
due to a digital code change and subsequent analog output  
change of another DAC. It is measured by loading the attack  
channel with a full-scale code change (all 0s to all 1s and vice  
versa), using the write to and update commands while monitor-  
ing the output of the victim channel that is at midscale. The  
energy of the glitch is expressed in nV-sec.  
V
REFmax VREFmin  
TC =  
×106  
V
×TempRange  
REFnom  
where:  
REFmax is the maximum reference output measured over the  
total temperature range.  
REFmin is the minimum reference output measured over the total  
temperature range.  
REFnom is the nominal reference output voltage, 2.5 V.  
Multiplying Bandwidth  
V
The amplifiers within the DAC have a finite bandwidth. The  
multiplying bandwidth is a measure of this. A sine wave on the  
reference (with full-scale code loaded to the DAC) appears on  
the output. The multiplying bandwidth is the frequency at  
which the output amplitude falls to 3 dB below the input.  
V
V
TempRange is the specified temperature range of −40°C to  
+105°C.  
Rev. D | Page 17 of 29  
AD5696R/AD5695R/AD5694R  
Data Sheet  
THEORY OF OPERATION  
The resistor string structure is shown in Figure 46. It is a string  
of resistors, each of Value R. The code loaded to the DAC register  
determines the node on the string where the voltage is to be  
tapped off and fed into the output amplifier. The voltage is  
tapped off by closing one of the switches connecting the  
string to the amplifier. Because it is a string of resistors, it is  
guaranteed monotonic.  
DIGITAL-TO-ANALOG CONVERTER  
The AD5696R/AD5695R/AD5694R are quad 16-/14-/12-bit,  
serial input, voltage output DACs with an internal reference.  
The parts operate from supply voltages of 2.7 V to 5.5 V. Data is  
written to the AD5696R/AD5695R/AD5694R in a 24-bit word  
format via a 2-wire serial interface. The AD5696R/AD5695R/  
AD5694R incorporate a power-on reset circuit to ensure that the  
DAC output powers up to a known output state. The devices also  
have a software power-down mode that reduces the typical  
current consumption to typically 4 µA.  
V
REF  
R
TRANSFER FUNCTION  
R
R
The internal reference is on by default. To use an external  
reference, only a nonreference option is available. Because the  
input coding to the DAC is straight binary, the ideal output  
voltage when using an external reference is given by  
TO OUTPUT  
AMPLIFIER  
D
2
VOUT =VREF ×Gain  
N
R
R
where:  
D is the decimal equivalent of the binary code that is loaded to  
the DAC register as follows:  
0 to 4,095 for the 12-bit device.  
0 to 16,383 for the 14-bit device.  
0 to 65,535 for the 16-bit device.  
N is the DAC resolution.  
Figure 46. Resistor String Structure  
Internal Reference  
Gain is the gain of the output amplifier and is set to 1 by default.  
This can be set to ×1 or ×2 using the gain select pin. When this  
pin is tied to GND, all four DAC outputs have a span from 0 V  
to VREF. If this pin is tied to VDD, all four DACs output a span of  
The AD5696R/AD5695R/AD5694R on-chip reference is on at  
power-up but can be disabled via a write to a control register.  
See the Internal Reference Setup section for details.  
The AD5696R/AD5695R/AD5694R have a 2.5 V, 2 ppm/°C  
reference, giving a full-scale output of 2.5 V or 5 V depending  
on the state of the GAIN pin. The internal reference associated  
with the device is available at the VREF pin. This buffered  
reference is capable of driving external loads of up to 10 mA.  
0 V to 2 × VREF  
.
DAC ARCHITECTURE  
The DAC architecture consists of a string DAC followed by an  
output amplifier. Figure 45 shows a block diagram of the DAC  
architecture.  
Output Amplifiers  
V
REF  
The output buffer amplifier can generate rail-to-rail voltages on  
its output, which gives an output range of 0 V to VDD. The actual  
range depends on the value of VREF, the GAIN pin, offset error,  
and gain error. The GAIN pin selects the gain of the output.  
2.5V  
REF  
REF (+)  
INPUT  
REGISTER  
DAC  
REGISTER  
RESISTOR  
STRING  
V
X
OUT  
If this pin is tied to GND, all four outputs have a gain of 1  
and the output range is 0 V to VREF  
If this pin is tied to VLOGIC, all four outputs have a gain of 2  
and the output range is 0 V to 2 × VREF  
REF (–)  
GAIN  
.
(GAIN = 1 OR 2)  
GND  
Figure 45. Single DAC Channel Architecture Block Diagram  
.
These amplifiers are capable of driving a load of 1 kΩ in parallel  
with 2 nF to GND. The slew rate is 0.8 V/µs with a ¼ to ¾ scale  
settling time of 5 µs.  
Rev. D | Page 18 of 29  
 
 
 
 
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
Table 7. Command Definitions  
SERIAL INTERFACE  
Command  
The AD5696R/AD5695R/AD5694R have 2-wire I2C-compati-  
ble serial interfaces (refer to I2C-Bus Specification, Version 2.1,  
January 2000, available from Philips Semiconductor). See Figure 2  
for a timing diagram of a typical write sequence. The AD5696R/  
AD5695R/AD5694R can be connected to an I2C bus as a slave  
device, under the control of a master device. The AD5696R/  
AD5695R/AD5694R support standard (100 kHz) and fast  
(400 kHz) data transfer modes. Support is not provided for 10-  
bit addressing and general call addressing. Power should not be  
removed while the device is connected to an active I2C bus.  
C3  
0
C2  
0
C1 C0  
Description  
0
0
1
0
1
0
No operation  
0
0
LDAC  
Write to Input Register n (dependent on )  
0
0
Update DAC Register n with contents of Input  
Register n  
0
0
1
1
Write to and update DAC Channel n  
Power down/power up DAC  
0
1
0
0
0
1
0
1
LDAC  
Hardware mask register  
0
1
1
0
Software reset (power-on reset)  
Internal reference setup register  
Reserved  
0
1
1
1
1
0
0
0
Input Shift Register  
1
1
1
1
Reserved  
Reserved  
The input shift register of the AD5696R/AD5695R/AD5694R is  
24 bits wide. Data is loaded into the device as a 24-bit word  
under the control of a serial clock input, SCL. The first eight  
MSBs make up the command byte. The first four bits are the  
command bits (C3, C2, C1, C0) that control the mode of  
operation of the device (see Table 7). The last 4 bits of first byte  
are the address bits (DAC A, DAC B, DAC C, DAC D) (see  
Table 8).  
Table 8. Address Commands  
Address (n)  
DAC D DAC C DAC B DAC A  
Selected DAC Channel1  
DAC A  
DAC B  
DAC C  
0
0
0
1
0
1
0
0
1
0
0
1
0
1
0
0
1
1
1
0
0
0
1
1
DAC D  
DAC A and DAC B1  
All DACs  
The data-word comprises 16-bit, 14-bit, or 12-bit input code,  
followed by four, two, or zero don’t care bits for the AD5696R,  
AD5695R, and AD5694R, respectively (see Figure 47, Figure 48,  
and Figure 49). These data bits are transferred to the input  
register on the 24 falling edges of SCL.  
1 Any combination of DAC channels can be selected using the address bits.  
Commands can be executed on individual DAC channels,  
combined DAC channels, or on all DACs, depending on the  
address bits selected.  
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0  
C3  
C2  
C1  
C0 DAC D DAC C DAC B DAC A D11  
D10  
D9  
D8  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
X
X
X
X
COMMAND  
DAC ADDRESS  
DAC DATA  
DAC DATA  
COMMAND BYTE  
DATA HIGH BYTE  
DATA LOW BYTE  
Figure 47. AD5696R Input Shift Register Content  
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0  
C3  
C2  
C1  
C0 DAC D DAC C DAC B DAC A D13  
D12  
D11  
D10  
D9  
D8  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
X
X
COMMAND  
DAC ADDRESS  
DAC DATA  
DAC DATA  
COMMAND BYTE  
DATA HIGH BYTE  
DATA LOW BYTE  
Figure 48. AD5695R Input Shift Register Content  
Rev. D | Page 19 of 29  
 
 
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0  
C3  
C2  
C1  
C0 DAC D DAC C DAC B DAC A D15  
D14  
D13  
D12  
D11  
D10  
D9  
D8  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
COMMAND  
DAC ADDRESS  
DAC DATA  
DAC DATA  
COMMAND BYTE  
DATA HIGH BYTE  
DATA LOW BYTE  
Figure 49. AD5694R Input Shift Register Content  
Update DAC Register n with Contents of Input Register n  
WRITE AND UPDATE COMMANDS  
Command 0010 loads the DAC registers/outputs with the  
contents of the input registers selected and updates the DAC  
outputs directly.  
Write to Input Register n (Dependent on  
)
LDAC  
Command 0001 allows the user to write to each DACs  
LDAC  
dedicated input register individually. When  
is low,  
LDAC  
Write to and Update DAC Channel n (Independent of  
the input register is transparent (if not controlled by the  
mask register).  
)
LDAC  
Command 0011 allows the user to write to the DAC registers  
and update the DAC outputs directly.  
Rev. D | Page 20 of 29  
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
2. Data is transmitted over the serial bus in sequences of nine  
clock pulses (eight data bits followed by an acknowledge  
bit). The transitions on the SDA line must occur during  
the low period of SCL and remain stable during the high  
period of SCL.  
3. When all data bits have been read or written, a stop  
condition is established. In write mode, the master pulls  
the SDA line high during the 10th clock pulse to establish  
a stop condition. In read mode, the master issues a no  
acknowledge for the 9th clock pulse (that is, the SDA line  
remains high). The master then brings the SDA line low  
before the 10th clock pulse, and then high during the 10th  
clock pulse to establish a stop condition.  
SERIAL OPERATION  
The AD5696R/AD5695R/AD5694R each have a 7-bit slave  
address. The five MSBs are 00011 and the two LSBs (A1, A0)  
are set by the state of the A0 and A1 address pins. The ability  
to make hardwired changes to A0 and A1 allows the user to  
incorporate up to four of these devices on one bus, as outlined  
in Table 9.  
Table 9. Device Address Selection  
A0 Pin Connection  
A1 Pin Connection  
A0  
0
1
A1  
0
0
GND  
VLOGIC  
GND  
GND  
GND  
VLOGIC  
0
1
VLOGIC  
VLOGIC  
1
1
WRITE OPERATION  
The 2-wire serial bus protocol operates as follows:  
1. The master initiates data transfer by establishing a start  
When writing to the AD5696R/AD5695R/AD5694R, the user  
must begin with a start command followed by an address byte  
W
(R/ = 0), after which the DAC acknowledges that it is  
condition when a high-to-low transition on the SDA line  
occurs while SCL is high. The following byte is the address  
byte, which consists of the 7-bit slave address. The slave  
address corresponding to the transmitted address responds  
by pulling SDA low during the 9th clock pulse (this is  
termed the acknowledge bit). At this stage, all other devices  
on the bus remain idle while the selected device waits for  
data to be written to, or read from, its shift register.  
prepared to receive data by pulling SDA low. The AD5696R/  
AD5695R/AD5694R require two bytes of data for the DAC  
and a command byte that controls various DAC functions.  
Three bytes of data must, therefore, be written to the DAC with  
the command byte followed by the most significant data byte  
and the least significant data byte, as shown in Figure 50. All  
these data bytes are acknowledged by the AD5696R/AD5695R/  
AD5694R. A stop condition follows.  
1
9
1
9
SCL  
SDA  
0
0
0
1
1
A1  
A0  
R/W  
ACK. BY  
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16  
ACK. BY  
AD5696R/AD5695R/AD5694R  
START BY  
MASTER  
AD5696R/AD5695R/AD5694R  
FRAME 1  
SLAVE ADDRESS  
FRAME 2  
COMMAND BYTE  
1
9
1
9
SCL  
(CONTINUED)  
SDA  
(CONTINUED)  
DB15 DB14 DB13 DB12 DB11 DB10 DB9  
DB7  
DB6 DB5 DB4  
DB3  
DB2  
DB1  
DB0  
DB8  
ACK. BY  
ACK. BY  
AD5696R/AD5695R/AD5694R  
AD5696R/AD5695R/AD5694R  
FRAME 3  
MOST SIGNIFICANT  
DATA BYTE  
FRAME 4  
STOP BY  
MASTER  
LEAST SIGNIFICANT  
DATA BYTE  
Figure 50. I2C Write Operation  
Rev. D | Page 21 of 29  
 
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
MULTIPLE DAC READBACK SEQUENCE  
READ OPERATION  
W
The user begins with an address byte (R/ = 0), after which the  
When reading data back from the AD5696R DACs, the user  
DAC acknowledges that it is prepared to receive data by pulling  
SDA low. This address byte must be followed by the control  
byte, which is also acknowledged by the DAC. The user  
configures which channel to start the readback using the  
control byte. Following this, there is a repeated start condition  
W
begins with an address byte (R/ = 0), after which the DAC  
acknowledges that it is prepared to receive data by pulling SDA  
low. This address byte must be followed by the NOP command  
operation that sets the internal pointer to the DAC address to  
read from, which is also acknowledged by the DAC. Following  
this, there is a repeated start condition by the master and the  
W
by the master and the address is resent with R/ = 1. This is  
acknowledged by the DAC, indicating that it is prepared to  
transmit data. The first two bytes of data are then read from the  
DAC Input Register n selected using the control byte, most  
significant byte first as shown in Figure 51. The next two bytes  
read back are the contents of DAC Input Register n + 1, the next  
bytes read back are the contents of DAC Input Register n + 2.  
Data continues to be read from the DAC input registers in this  
auto-incremental fashion, until a NACK followed by a stop  
condition follows. If the contents of DAC Input Register D are  
read out, the next two bytes of data that are read are from the  
contents of DAC Input Register A.  
W
address is resent with R/ = 1. This is acknowledged by the  
DAC, indicating that it is prepared to transmit data. Two bytes  
of data are then read from the DAC, as shown in Figure 51. A  
NACK condition from the master, followed by a STOP  
condition, completes the read sequence. Default readback  
is Channel A if more than one DAC is selected.  
1
9
1
9
SCL  
0
0
0
1
1
A1  
A0  
R/W  
ACK. BY  
DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16  
SDA  
ACK. BY  
AD5696R/AD5695R/AD5694R  
START BY  
MASTER  
AD5696R/AD5695R/AD5694R  
FRAME 1  
SLAVE ADDRESS  
FRAME 2  
COMMAND BYTE  
1
9
1
9
SCL  
SDA  
0
0
0
1
1
A1  
A0  
R/W  
ACK. BY  
DB15 DB14 DB13 DB12 DB11 DB10 DB9  
DB8  
REPEATED START BY  
MASTER  
AD5696R/AD5695R/AD5694R  
FRAME 3  
SLAVE ADDRESS  
1
9
SCL  
(CONTINUED)  
SDA  
(CONTINUED)  
DB7 DB6  
DB5 DB4  
DB3 DB2  
DB1  
DB0  
STOP BY  
MASTER  
FRAME 5  
SLAVE ADDRESS  
SIGNIFICANT DATA BYTE n  
Figure 51. I2C Read Operation  
Rev. D | Page 22 of 29  
 
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
output stage is also internally switched from the output of the  
amplifier to a resistor network of known values. This has the  
advantage that the output impedance of the part is known while  
the part is in power-down mode. There are three different  
power-down options. The output is connected internally to  
GND through either a 1 kΩ or a 100 kΩ resistor, or it is left  
open-circuited (three-state). The output stage is illustrated in  
Figure 52.  
POWER-DOWN OPERATION  
The AD5696R/AD5695R/AD5694R contain three separate  
power-down modes. Command 0100 is designated for the power-  
down function (see Table 7). These power-down modes are  
software-programmable by setting eight bits, Bit DB7 to Bit DB0,  
in the shift register. There are two bits associated with each DAC  
channel. Table 10 shows how the state of the two bits corresponds  
to the mode of operation of the device.  
Table 10. Modes of Operation  
AMPLIFIER  
V
X
DAC  
OUT  
Operating Mode  
Normal Operation  
Power-Down Modes  
1 kΩ to GND  
100 kΩ to GND  
Three-State  
PDx1  
PDx0  
0
0
0
1
1
1
0
1
POWER-DOWN  
CIRCUITRY  
RESISTOR  
NETWORK  
Figure 52. Output Stage During Power-Down  
Any or all DACs (DAC A to DAC D) can be powered down  
to the selected mode by setting the corresponding bits. See  
Table 11 for the contents of the input shift register during  
the power-down/power-up operation.  
The bias generator, output amplifier, resistor string, and other  
associated linear circuitry are shut down when the power-down  
mode is activated. However, the contents of the DAC register  
are unaffected when in power-down. The DAC register can be  
updated while the device is in power-down mode. The time  
required to exit power-down is typically 4.5 µs for VDD = 5 V.  
When both Bit PDx1 and Bit PDx0 (where x is the channel  
selected) in the input shift register are set to 0, the parts work  
normally with its normal power consumption of 4 mA at 5 V.  
However, for the three power-down modes, the supply current  
falls to 4 μA at 5 V. Not only does the supply current fall, but the  
To reduce the current consumption further, the on-chip reference  
can be powered off. See the Internal Reference Setup section.  
Table 11. 24-Bit Input Shift Register Contents of Power-Down/Power-Up Operation1  
DB15  
to  
DB8  
DB0  
(LSB)  
DB23 DB22  
DB21  
DB20  
DB19 to DB16  
DB7  
DB6  
DB5  
DB4  
DB3  
DB2  
DB1  
0
1
0
0
X
X
PDD1  
PDD0  
PDC1  
PDC0  
PDB1  
PDB0 PDA1  
PDA0  
Command bits (C3 to C0)  
Address bits  
Don’t care  
Power-Down  
Select DAC D  
Power-Down  
Select DAC C  
Power-Down  
Select DAC B  
Power-Down  
Select DAC A  
1 X = don’t care.  
Rev. D | Page 23 of 29  
 
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
LOAD DAC (HARDWARE LDAC PIN)  
LDAC MASK REGISTER  
The AD5696R/AD5695R/AD5694R DACs have double  
buffered interfaces consisting of two banks of registers:  
input registers and DAC registers. The user can write to  
any combination of the input registers. Updates to the DAC  
LDAC  
function.  
Command 0101 is reserved for this software  
Address bits are ignored. Writing to the DAC, using Command  
LDAC  
0101, loads the 4-bit  
for each channel is 0; that is, the  
Setting the bits to 1 forces this DAC channel to ignore transitions  
LDAC LDAC  
register (DB3 to DB0). The default  
LDAC  
pin works normally.  
LDAC  
register are controlled by the  
pin.  
OUTPUT  
AMPLIFIER  
on the  
pin. This flexibility is useful in applications where the user  
LDAC  
pin, regardless of the state of the hardware  
12-/14-/16-BIT  
REFIN  
LDAC  
V
OUT  
DAC  
wishes to select which channels respond to the  
LDAC  
pin.  
Table 12.  
Load  
Overwrite Definition  
Register  
DAC  
REGISTER  
LDAC  
Bits  
LDAC  
INPUT  
Pin  
Operation  
LDAC  
LDAC  
1 or 0  
X1  
(DB3 to DB0)  
REGISTER  
0
1
Determined by the LDAC pin.  
DAC channels update and  
override the LDAC pin. DAC  
channels see LDAC as 1.  
SCL  
SDO  
INPUT SHIFT  
REGISTER  
Figure 53. Simplified Diagram of Input Loading Circuitry for a Single DAC  
1 X = don’t care.  
LDAC  
Instantaneous DAC Updating (  
Held Low)  
LDAC  
over the hardware  
The  
register gives the user extra flexibility and control  
LDAC LDAC  
LDAC  
is held low while data is clocked into the input register  
pin (see Table 12). Setting the  
bits (DB0 to DB3) to 0 for a DAC channel means that this  
LDAC  
using Command 0001. Both the addressed input register and  
the DAC register are updated on the 24th clock and the output  
begins to change (see Table 13).  
channel’s update is controlled by the hardware  
pin.  
LDAC  
Deferred DAC Updating (  
is Pulsed Low)  
LDAC  
is held high while data is clocked into the input register  
using Command 0001. All DAC outputs are asynchronously  
th  
LDAC  
updated by taking  
low after the 24 clock. The update  
LDAC  
now occurs on the falling edge of  
Table 13. Write Commands and  
Commands Description  
.
1
LDAC  
Pin Truth Table  
Hardware  
Pin State  
LDAC  
Input Register  
Contents  
DAC Register Contents  
No change (no update)  
Data update  
0001  
Write to Input Register n (dependent on LDAC)  
VLOGIC  
GND2  
Data update  
Data update  
No change  
0010  
Update DAC Register n with contents of Input  
Register n  
VLOGIC  
Updated with input register  
contents  
GND  
No change  
Updated with input register  
contents  
0011  
Write to and update DAC Channel n  
VLOGIC  
GND  
Data update  
Data update  
Data update  
Data update  
1
LDAC  
A high to low hardware  
pin transition always updates the contents of the contents of the DAC register with the contents of the input register on channels that  
LDAC  
are not masked (blocked) by the  
mask register.  
2 When LDAC is permanently tied low, the LDAC mask bits are ignored.  
Rev. D | Page 24 of 29  
 
 
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
HARDWARE RESET (  
)
RESET  
SOLDER HEAT REFLOW  
RESET  
is an active low reset that allows the outputs to be  
cleared to either zero scale or midscale. The clear code value is  
RESET  
As with all IC reference voltage circuits, the reference value  
experiences a shift induced by the soldering process. Analog  
Devices, Inc., performs a reliability test called precondition to  
mimic the effect of soldering a device to a board. The output  
voltage specification quoted previously includes the effect of  
this reliability test.  
user selectable via the  
RESET  
operation (see Figure 2). When the  
high, the output remains at the cleared value until a new value is  
programmed. The outputs cannot be updated with a new value  
select pin. It is necessary to keep  
low for a minimum amount of time to complete the  
RESET  
signal is returned  
Figure 54 shows the effect of solder heat reflow (SHR) as  
measured through the reliability test (precondition).  
RESET  
while the  
pin is low. There is also a software executable  
reset function that resets the DAC to the power-on reset code.  
Command 0110 is designated for this software reset function  
POSTSOLDER  
HEAT REFLOW  
60  
50  
40  
30  
20  
10  
0
LDAC  
(see Table 7). Any events on  
during a power-on reset are  
PRESOLDER  
HEAT REFLOW  
RESET  
ignored. If the  
pin is pulled low at power-up, the device  
does not initialize correctly until the pin is released.  
RESET SELECT PIN (RSTSEL)  
The AD5696R/AD5695R/AD5694R contain a power-on reset  
circuit that controls the output voltage during power-up. By  
connecting the RSTSEL pin low, the output powers up to zero  
scale. Note that this is outside the linear region of the DAC; by  
connecting the RSTSEL pin high, VOUT powers up to midscale.  
The output remains powered up at this level until a valid write  
sequence is made to the DAC.  
2.498  
2.499  
2.500  
(V)  
2.501  
2.502  
V
REF  
Figure 54. SHR Reference Voltage Shift  
INTERNAL REFERENCE SETUP  
LONG-TERM TEMPERATURE DRIFT  
The on-chip reference is on at power-up by default. To reduce  
the supply current, this reference can be turned off by setting  
software programmable bit, DB0, in the control register.  
Table 14 shows how the state of the bit corresponds to the  
mode of operation. Command 0111 is reserved for setting up  
the internal reference (see Figure 6). Table 14 shows how the  
state of the bits in the input shift register corresponds to the  
mode of operation of the device during internal reference setup.  
Figure 55 shows the change in the VREF (ppm) value after 1000  
hours at 25°C ambient temperature.  
140  
120  
100  
80  
Table 14. Reference Setup Register  
60  
Internal Reference  
Setup Register (DB0) Action  
40  
0
1
Reference on (default)  
Reference off  
20  
0
–20  
0
100 200 300 400 500 600 700 800 900 1000  
ELAPSED TIME (Hours)  
Figure 55. Reference Drift Through to 1000 Hours  
Rev. D | Page 25 of 29  
 
 
 
 
 
 
 
 
AD5696R/AD5695R/AD5694R  
Data Sheet  
9
8
7
6
5
4
3
2
1
THERMAL HYSTERESIS  
FIRST TEMPERATURE SWEEP  
SUBSEQUENT TEMPERATURE SWEEPS  
Thermal hysteresis is the voltage difference induced on the  
reference voltage by sweeping the temperature from ambient  
to cold, to hot and then back to ambient.  
Thermal hysteresis data is shown in Figure 56. It is measured by  
sweeping temperature from ambient to −40°C, then to +105°C,  
and returning to ambient. The VREF delta is then measured  
between the two ambient measurements and shown in blue  
in Figure 56. The same temperature sweep and measurements  
were immediately repeated and the results are shown in red in  
Figure 56.  
0
–200  
–150  
–100  
–50  
0
50  
DISTORTION (ppm)  
Figure 56. Thermal Hysteresis  
Table 15. 24-Bit Input Shift Register Contents for Internal Reference Setup Command1  
DB23  
(MSB)  
DB22 DB21  
DB20  
DB19  
DB18  
DB17  
DB16  
DB15 to DB1  
X
DB0 (LSB)  
0
1
1
1
X
X
X
X
1/0  
Command bits (C3 to C0)  
Address bits (A2 to A0)  
Don’t care  
Reference setup register  
1 X = don’t care.  
Rev. D | Page 26 of 29  
 
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
APPLICATIONS INFORMATION  
special considerations to design the motherboard and to mount  
the package. For enhanced thermal, electrical, and board level  
performance, solder the exposed paddle on the bottom of the  
package to the corresponding thermal land paddle on the PCB.  
Design thermal vias into the PCB land paddle area to further  
improve heat dissipation.  
MICROPROCESSOR INTERFACING  
Microprocessor interfacing to the AD5696R/AD5695R/  
AD5694R is via a serial bus that uses a standard protocol that  
is compatible with DSP processors and microcontrollers. The  
communications channel requires a 2-wire interface consisting of  
a clock signal and a data signal.  
The GND plane on the device can be increased (as shown in  
Figure 58) to provide a natural heat sinking effect.  
AD5696R/AD5695R/AD5694R TO ADSP-BF531  
INTERFACE  
AD5696R/  
AD5695R/  
AD5694R  
The I2C interface of the AD5696R/AD5695R/AD5694R is  
designed to be easily connected to industry-standard DSPs and  
microcontrollers. Figure 57 shows the AD5696R/AD5695R/  
AD5694R connected to the Analog Devices Blackfin® DSP. The  
Blackfin has an integrated I2C port that can be connected  
directly to the I2C pins of the AD5696R/AD5695R/AD5694R.  
GND  
PLANE  
AD5696R/  
AD5695R/  
AD5694R  
BOARD  
ADSP-BF531  
Figure 58. Paddle Connection to Board  
GPIO1  
GPIO2  
SCL  
SDA  
GALVANICALLY ISOLATED INTERFACE  
In many process control applications, it is necessary to  
provide an isolation barrier between the controller and  
the unit being controlled to protect and isolate the controlling  
circuitry from any hazardous common-mode voltages that  
may occur. iCoupler® products from Analog Devices provide  
voltage isolation in excess of 2.5 kV. The serial loading struc-  
ture of the AD5696R/AD5695R/AD5694R makes the part ideal  
for isolated interfaces because the number of interface lines is  
kept to a minimum. Figure 59 shows a 4-channel isolated  
interface to the AD5696R/AD5695R/AD5694R using an  
ADuM1400. For further information, visit  
PF9  
PF8  
LDAC  
RESET  
Figure 57. ADSP-BF531 Interface  
LAYOUT GUIDELINES  
In any circuit where accuracy is important, careful consider-  
ation of the power supply and ground return layout helps  
to ensure the rated performance. The PCB on which the  
AD5696R/AD5695R/AD5694R are mounted should be  
designed so that the AD5696R/AD5695R/AD5694R lie  
on the analog plane.  
http://www.analog.com/icouplers.  
The AD5696R/AD5695R/AD5694R should have ample supply  
bypassing of 10 μF in parallel with 0.1 μF on each supply, located as  
close to the package as possible, ideally right up against the  
device. The 10 μF capacitors are the tantalum bead type. The  
0.1 μF capacitor should have low effective series resistance  
(ESR) and low effective series inductance (ESI) such as the  
common ceramic types, which provide a low impedance path to  
ground at high frequencies to handle transient currents due to  
internal logic switching.  
ADuM14001  
CONTROLLER  
V
V
V
V
V
V
V
V
IA  
IB  
IC  
ID  
OA  
OB  
OC  
OD  
TO  
SERIAL  
ENCODE  
ENCODE  
ENCODE  
ENCODE  
DECODE  
DECODE  
DECODE  
DECODE  
SCL  
CLOCK IN  
TO  
SDA  
SERIAL  
DATA OUT  
TO  
RESET  
RESET OUT  
In systems where there are many devices on one board, it is  
often useful to provide some heat sinking capability to allow  
the power to dissipate easily.  
LOAD DAC  
OUT  
TO  
LDAC  
1
ADDITIONAL PINS OMITTED FOR CLARITY.  
The AD5696R/AD5695R/AD5694R LFCSP models have an  
exposed paddle beneath the device. Connect this paddle to the  
GND supply for the part. For optimum performance, use  
Figure 59. Isolated Interface  
Rev. D | Page 27 of 29  
 
 
 
 
 
 
 
 
AD5696R/AD5695R/AD5694R  
OUTLINE DIMENSIONS  
Data Sheet  
3.10  
3.00 SQ  
2.90  
0.30  
0.23  
0.18  
PIN 1  
INDICATOR  
PIN 1  
INDICATOR  
13  
16  
0.50  
BSC  
1
4
12  
EXPOSED  
PAD  
1.75  
1.60 SQ  
1.45  
9
8
5
0.50  
0.40  
0.30  
0.25 MIN  
TOP VIEW  
BOTTOM VIEW  
FOR PROPER CONNECTION OF  
THE EXPOSED PAD, REFER TO  
THE PIN CONFIGURATION AND  
FUNCTION DESCRIPTIONS  
0.80  
0.75  
0.70  
0.05 MAX  
0.02 NOM  
COPLANARITY  
0.08  
SECTION OF THIS DATA SHEET.  
SEATING  
PLANE  
0.20 REF  
COMPLIANT TO JEDEC STANDARDS MO-220-WEED-6.  
Figure 60. 16-Lead Lead Frame Chip Scale Package [LFCSP_WQ]  
3 mm × 3 mm Body, Very Very Thin Quad  
(CP-16-22)  
Dimensions shown in millimeters  
5.10  
5.00  
4.90  
16  
9
8
4.50  
4.40  
4.30  
6.40  
BSC  
1
PIN 1  
1.20  
MAX  
0.15  
0.05  
0.20  
0.09  
0.75  
0.60  
0.45  
8°  
0°  
0.30  
0.19  
0.65  
BSC  
SEATING  
PLANE  
COPLANARITY  
0.10  
COMPLIANT TO JEDEC STANDARDS MO-153-AB  
Figure 61. 16-Lead Thin Shrink Small Outline Package [TSSOP]  
(RU-16)  
Dimensions shown in millimeters  
Rev. D | Page 28 of 29  
 
Data Sheet  
AD5696R/AD5695R/AD5694R  
ORDERING GUIDE  
Reference  
Tempco  
(ppm/°C)  
Temperature  
Range  
Package  
Description  
Package  
Option  
Model1  
Resolution  
16 Bits  
16 Bits  
16 Bits  
16 Bits  
16 Bits  
16 Bits  
14 Bits  
14 Bits  
14 Bits  
14 Bits  
14 Bits  
12 Bits  
12 Bits  
12 Bits  
12 Bits  
12 Bits  
Accuracy  
±± LꢀB INL  
±2 LꢀB INL  
±± LꢀB INL  
±± LꢀB INL  
±2 LꢀB INL  
±2 LꢀB INL  
±1 LꢀB INL  
±4 LꢀB INL  
±4 LꢀB INL  
±1 LꢀB INL  
±1 LꢀB INL  
±1 LꢀB INL  
±2 LꢀB INL  
±2 LꢀB INL  
±1 LꢀB INL  
±1 LꢀB INL  
Branding  
DJA  
DJD  
AD5696RACPZ-RL7  
AD5696RBCPZ-RL7  
AD5696RARUZ  
AD5696RARUZ-RL7  
AD5696RBRUZ  
AD5696RBRUZ-RL7  
AD5695RBCPZ-RL7  
AD5695RARUZ  
AD5695RARUZ-RL7  
AD5695RBRUZ  
AD5695RBRUZ-RL7  
AD5694RBCPZ-RL7  
AD5694RARUZ  
AD5694RARUZ-RL7  
AD5694RBRUZ  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
−40°C to +105°C  
±5 ꢁtyp)  
±5 ꢁ(aꢂ)  
±5 ꢁtyp)  
±5 ꢁtyp)  
±5 ꢁ(aꢂ)  
±5 ꢁ(aꢂ)  
±5 ꢁ(aꢂ)  
±5 ꢁtyp)  
±5 ꢁtyp)  
±5 ꢁ(aꢂ)  
±5 ꢁ(aꢂ)  
±5 ꢁ(aꢂ)  
±5 ꢁtyp)  
±5 ꢁtyp)  
±5 ꢁ(aꢂ)  
±5 ꢁ(aꢂ)  
16-Lead LFCꢀP_WQ CP-16-22  
16-Lead LFCꢀP_WQ CP-16-22  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
RU-16  
RU-16  
RU-16  
RU-16  
16-Lead LFCꢀP_WQ CP-16-22  
DJR  
DJL  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
RU-16  
RU-16  
RU-16  
RU-16  
16-Lead LFCꢀP_WQ CP-16-22  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
16-Lead TꢀꢀOP  
RU-16  
RU-16  
RU-16  
RU-16  
AD5694RBRUZ-RL7  
EVAL-AD5696RꢀDZ  
AD5696R TꢀꢀOP  
Evaluation Board  
1 Z = RoHꢀ Co(pliant Part.  
©2012–2017 Analog Devices, Inc. All rights reserved. Trademarks and  
registered trademarks are the property of their respective owners.  
D10486-0-4/17(D)  
Rev. D | Page 29 of 29  
 

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