7846ARPFB [MAXWELL]
16-Bit Digital to Analog Converter; 16位数模转换器型号: | 7846ARPFB |
厂家: | MAXWELL TECHNOLOGIES |
描述: | 16-Bit Digital to Analog Converter |
文件: | 总11页 (文件大小:258K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
7846A
16-Bit Digital to Analog Converter
VCC
21
VDD
4
VREF+
7
R
R
6
5
RIN
R
R
R
-
+
A2
16
-
+
VOUT
A3
Segment
Switch
Matrix
12-bit DAC
12
-
+
A1
23
22
CS
VREF-
7846A
8
DAC Latch
4
R/W
Control
Logic
12
25 LDAC
24 CLR
I/O Latch
9
10
3
20
VSS
DB15
DB0
DGND
Logic Diagram
FEATURES:
DESCRIPTION:
• RAD-PAK® technology-hardened against natural
space radiation
Maxwell Technologies’ 7846A 16-Bit DAC converter microcir-
cuit features a greater than 100 krad (Si) total dose tolerance,
• Total dose hardness:
depending upon space mission. The 7846A has V
and
REF+
- > 100 krad (Si), depending upon space mission
• Excellent Single Event Effects
VREF- reference inputs and an on-chip output amplifier which
gives the option of unipolar or bipolar output. The 7846A uses
a segmented architecture. The 4 MSBs in the DAC latch
select one of the segments in a 16-resistor string. Both taps of
the segment are buffered by amplifiers and fed to a 12-bit
DAC, which provides a further 12 bits of resolution. This archi-
tecture ensures 16-bit monotonicity. Excellent integral linearity
results from tight matching between the input offset voltages
of the two buffer amplifiers. In addition to the excellent accu-
racy specifications, the 7846A also offers a comprehensive
microprocessor interface. There are 16 data I/O pins, plus
control lines (CS, R/W, LDAC and CLR). R/W and CS have
readback function which allows writing to and reading from the
I/O latch.
- SEL > 114 MeV/mg/cm2
TH
- SEU < 8 MeV/mg/cm2
• Package:
-28 pin RAD-PAK® Flat Pack
• Microprocessor compatible with readback capability
• 16-Bit monotonicity over temperature
• ±2 LSBs integral linearity error
• Unipolar or bipolar output
• Multiplying capability
• Low power (100 mW typical)
Maxwell Technologies' patented RAD-PAK® packaging technol-
ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, RAD-PAK provides greater than 100
krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.
05.29.03 REV 5
1
All data sheets are subject to change without notice
(619) 503-3300 - Fax: (619) 503-3301- www.maxwell.com
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
TABLE 1. 7846A PINOUT DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1-3
4
DB2-DB0
Data I/O pins. DB0 is LSB.
Positive supply for analog circuitry. This is +15V nominal.
DAC output voltage pin.
V
DD
5
V
OUT
6
RIN
Input to summing resistor of DAC output amplifier. This is used
to select output voltage ranges.
7
8
V
V
REF+ Input. The DAC is specified for VREF+ = +5V.
REF+
V
VREF- Input. For unipolar operation connect VREF- to 0V and for
REF-
bipolar operation connect it to -5V. The device is specified for
both conditions.
9
10-19
20
V
Negative supply for the analog circuitry. This is -15V nominal.
Data I/O pins. DB15 is MSB.
SS
DB15-DB6
DGND
Ground pin for digital circuitry.
21
V
Positive supply for digital circuitry. This is +5V nominal.
CC
22
R/W
R/W Input. This can be used to load data to the DAC or to read
back the DAC latch contents.
23
24
CS
Chip select input. This selects the device.
CLR
Clear Input. The DAC can be cleared to 000...000 or
100...000.
25
LDAC
Asynchronous load input to DAC.
Data I/O pins.
26-28
DB5-DB3
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2
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
1
TABLE 2. 7846A ABSOLUTE MAXIMUM RATINGS
PARAMETER
DD to DGND
CC to DGND
MIN
MAX
UNIT
V
-0.3
-0.3
+17
V
V
V
VDD +0.3 or 7
(Whichever Is Lower)
V to DGND
-17
-25
-25
-25
-25
-0.3
-0.3
+0.3
+25
+25
+25
+25
V
V
V
V
V
V
V
SS
V
REF+ to DGND
REF- to DGND
OUT to DGND 2
V
V
R to DGND
IN
Digital Input Voltage to DGND
Digital Output Voltage to DGND
VCC +0.3
V +0.3
CC
Power Dissipation
To +75 °C
Derates above +75 °C
1000
10
mW
mW/°C
Thermal Inpedance
2.78
°C
ΘJC
-55
Operating Temperature Range
Storage Temperature Range
+125
+150
°C
°C
-65
1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational sec-
tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may
affect device reliability. Only one absolute maximum rating may be applied at any one time.
2. VOUT may be shorted to DGND, V , V and VCC provided that the power dissipation of the package is not exceeded.
DD SS
TABLE 3. DELTA LIMITS
PARAMETER
VARIATION
IDD
IEE
ICC
±10% of value specified in Table 4.
±10% of value specified in Table 4.
±10% of value specified in Table 4.
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©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
1
TABLE 4. 7846A ELECTRICAL SPECIFICATIONS
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
T =-55 °C TO +125
A
PARAMETER
Resolution
TEST CONDITIONS/COMMENTS
SUBGROUPS
UNIT
Bits
°C
16
UNIPOLAR OUTPUT
Relative Accuracy @ 25 °C
- TMIN to TMAX
Differential Nonlinearity Error
Gain Error @ 25 °C
- TMIN to TMAX
Offset Error @ 25 °C
- TMIN to TMAX
Gain TC 2
Offset TC 2
VREF-=0V, VOUT=0V to +10V
1LSB=153µV
1
2, 3
1
1
2,3
1
2,3
1
1
±16
±16
±1
±12
±24
±12
±24
±2
LSB typ
LSB max
LSB max
LSB typ
LSB max
Guaranteed Monotonic
VOUT Load= 10MΩ
LSB typ
LSB max
ppm FSR/°C typ
ppm FSR/°C typ
±2
BIPOLAR OUTPUT
Relative Accuracy @ 25 °C
- TMIN to TMAX
VREF-=-5V, VOUT=-10V to +10V
1LSB=305µV
1
2, 3
1
1
2, 3
1
2, 3
1
2, 3
1
1
1
±6
±8
±1
±6
±16
±6
±16
±6
±16
±2
±2
±2
LSB typ
LSB max
LSB max
LSB typ
LSB max
LSB typ
LSB max
LSB typ
LSB max
Differential Nonlinearity Error
Gain Error @ 25 °C
- TMIN to TMAX
Guaranteed Monotonic
VOUT Load=10MΩ
Offset Error @ 25 °C
- TMIN to TMAX
VOUT Load=10MΩ
Bipolar Zero Error @ 25 °C
- TMIN to TMAX
Gain TC 2
ppm FSR/°C typ
ppm FSR/°C typ
ppm FSR/°C typ
Offset TC 2
Bipolar Zero TC 2
REFERENCE INPUT
Input Resistance
Resistance from VREF- to V
Typically 30kΩ
1, 2, 3
1, 2, 3
20
40
KΩ min
KΩ max
V
REF+
VREF+ Range
V + 6 to VDD - 6
V + 6 to VDD - 6
SS
VREF- Range
V
SS
OUTPUT CHARACTERISTICS
Output Voltage Swing
Resistive Load1
Capacitive Load3
Output Resistance
V + 4 to VDD - 3
V max
kΩ min
pF max
Ω typ
SS
To 0V
To 0V
3
1000
0.3
Short Circuit Current
To 0V or Any Power Supply
±25
mA typ
DIGITAL INPUTS
V (Input High Voltage)
1, 2, 3
1, 2, 3
2.4
0.8
±10
10
V min
V max
µAmax
pF max
IH
V (Input Low Voltage)
IL
I (Input Current)
IN
CIN (Input Capacitance) 2
DIGITAL OUTPUTS
V (Output Low Voltage)
ISINK = 1.6mA
SOURCE = 400µA
DB0-DB15 = 0 to V
0.4
4.0
±10
10
V max
V min
µAmax
pF max
OL
VOH (Output High Voltage)
I
Floating State Leakage Current
Floating State Output Capacitance 2
CC
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16-Bit Digital to Analog Converter
7846A
1
TABLE 4. 7846A ELECTRICAL SPECIFICATIONS
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
T =-55 °C TO +125
A
PARAMETER
TEST CONDITIONS/COMMENTS
SUBGROUPS
UNIT
°C
POWER REQUIREMENTS 4
V
1, 2, 3
+11.4/+15.75
-11.4/-15.75
+4.75/+5.25
V min/V max
V min/V max
V min/V max
mA max
DD
V
SS
V
CC
IDD
ISS
V
OUT Unloaded
5
5
VOUT Unloaded
mA max
ICC
1
2
100
mA max
LSB/V max
mW typ
Power Supply Sensitivity 5
Power Dissipation
VOUT Unloaded
1. Minimum load is 3kΩ.
2. Sample tested to ensure compliance.
3. Maximum load is 1000pF.
4. 7846ARP is functional with power supplies of ±12V. See typical performance curves.
5. Sensitivity to Gain Error, Offset Error and Bipolar Zero Error to V , V variations.
DD SS
6. Guaranteed by design
1
TABLE 5. 7846A AC PERFORMANCE CHARACTERISTICS
(VDD=+15V ±5%; VSS=-15V ±5%; VCC = +5 V ±5%, TA = -55 TO +125°C)
TA=25°C
TA=TMIN TO TMAX
PARAMETER
TEST CONDITIONS
UNIT
Output Settling Time
To 0.006% FSR. VOUT loaded. VREF-=0V.
To 0.003% FSR. VOUT loaded. VREF-=-5V.
7
9
7
9
µs max
µs max
Digital-to-Analog Glitch DAC alternately loaded with 10…0000 and
400
400
nV-secs typ
Impulse
01…1111. VOUT unloaded.
AC Feed through
V
REF-=0V, VREF+=1V rms, 10kHz sine wave.
0.5
10
50
0.5
10
50
mV pk-pk typ
nV-secs typ
DAC loaded with all 0s.
Digital Feed through
DAC alternately loaded with all 1s and all
0s. CS High.
½
Output Noise Voltage
Density
Measured at V . DAC loaded with
0111011…11.
nV/(Hz) typ
OUT
(1kHz-100kHz)
VREF+=VREF-=0V.
1. Guaranteed by design.
05.29.03 REV 5
All data sheets are subject to change without notice
5
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
1,2,3,4
TABLE 6. 7846A TIMING CHARACTERISTICS
(VDD = +14.25V TO 15.75V; V = -14.25V TO -15.75V; VCC = 4.75 TO 5.25V; UNLESS OTHERWISE SPECIFIED)
SS
LIMIT AT
PARAMETER
TEST CONDITIONS/COMMENTS
UNIT
T =-55 °C TO +125 °C
A
t1
t2
t3
t4
t5
t6
t7
R/W to CS Setup Time
CS Pulse Width (Write Cycle)
R/W to CS Hold Time
Data Setup Time
50
190
50
ns min
ns min
ns min
ns min
ns min
ns max
ns min
ns max
ns min
ns min
ns min
ns min
ns min
120
0
Data Hold Time
Data Access Time
320
10
Bus Relinquish Time
90
t8
CLR Setup Time
20
t9
CLR Pulse Width
150
0
t10
t11
t12
CLR Hold Time
LDAC Pulse Width
CS Pulse Width (Read Cycle)
100
330
1. Guaranteed by design. All input control signals are specified with tR = tF = 5ns (10% to 90% of +5V) and timed from a voltage
level of 1.6V.
2. t6 is measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8V or 2.4V.
3. t7 is defined as the time required for an output to change 0.5V when loaded with the circuits of Figure 2. Specifications subject to
change without notice.
4. See Figure 3 on page 7.
05.29.03 REV 5
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6
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
FIGURE 1. LOAD CIRCUITS FOR ACCESS TIME (t6)
FIGURE 2. LOAD CIRCUITS FOR BUS RELINQUISH TIME (t7)
FIGURE 3. 16-BIT DIGITAL TO ANALOG CONVERTER
t3
t1
t3
R./W
CS
0V
t12
t2
5V
t5
t4
t6
5V
DATA
CLR
Data Valid
Data Valid
t9
t8
t10
t10
0V
t11
LDAC
05.29.03 REV 5
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7
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
05.29.03 REV 5
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8
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
28 PIN RAD-PAK® FLAT PACKAGE
DIMENSION
SYMBOL
MIN
NOM
MAX
A
b
0.190
0.015
0.004
--
0.207
0.017
0.005
0.720
0.410
--
0.224
0.022
0.009
0.740
0.420
0.440
--
c
D
E
0.380
--
E1
E2
E3
e
0.180
0.030
0.250
0.080
0.050 BSC
0.370
0.073
0.027
28
--
L
0.360
0.062
0.000
0.380
0.081
--
Q
S1
N
F28-02
Note: All dimensions in inches
05.29.03 REV 5
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9
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
Important Notice:
These data sheets are created using the chip manufacturers published specifications. Maxwell Technologies verifies
functionality by testing key parameters either by 100% testing, sample testing or characterization.
The specifications presented within these data sheets represent the latest and most accurate information available to
date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no
responsibility for the use of this information.
Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems
without express written approval from Maxwell Technologies.
Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech-
nologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.
05.29.03 REV 5
All data sheets are subject to change without notice 10
©2003 Maxwell Technologies
All rights reserved.
16-Bit Digital to Analog Converter
7846A
Product Ordering Options
Model Number
7846A
RP
F
X
Option Details
Feature
Monolithic
Screening Flow
S = Maxwell Class S
B = Maxwell Class B
I = Industrial (testing @ -55°C,
+25°C, +125°C)
E = Engineering (testing @ +25°C)
F = Flat Pack
Package
RP = RAD-PAK® package
Radiation Feature
16-Bit Digital to Analog Converter
Base Product
Nomenclature
05.29.03 REV 5
All data sheets are subject to change without notice 11
©2003 Maxwell Technologies
All rights reserved.
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