AD8646ARMZ [ADI]
24 MHz Rail-to-Rail Amplifiers with Shutdown Option; 24 MHz轨到轨放大器与关机选项
| 型号： | AD8646ARMZ |
| 厂家： | 
ADI |
| 描述： | 24 MHz Rail-to-Rail Amplifiers with Shutdown Option |
| 文件： | 总20页 (文件大小：392K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
24 MHz Rail-to-Rail Amplifiers
with Shutdown Option
AD8646/AD8647/AD8648
FEATURES
PIN CONFIGURATIONS
Offset voltage: 2.5 mV maximum
Single-supply operation: 2.7 V to 5.5 V
Low noise: 8 nV/√Hz
OUTA
–INA
+INA
V–
1
2
3
4
8
7
6
5
V+
OUTB
–INB
+INB
AD8646
TOP VIEW
(Not to Scale)
Wide bandwidth: 24 MHz
Slew rate: 11 V/μs
Figure 1. 8-Lead SOIC and MSOP
Short-circuit output current: 120 mA
Qualified for automotive applications
No phase reversal
Low input bias current: 1 pA
Low supply current per amplifier: 2 mA maximum
Unity gain stable
OUTA
–INA
+INA
V–
1
2
3
4
5
10 V+
9
8
7
6
OUTB
AD8647
–INB
+INB
SDB
TOP VIEW
(Not to Scale)
SDA
Figure 2. 10-Lead MSOP
APPLICATIONS
1
2
3
4
5
6
7
OUTA
–INA
+INA
V+
14
13
OUTD
–IND
Battery-powered instruments
Multipole filters
ADC front ends
Sensors
Barcode scanners
AD8648
TOP VIEW
(Not to Scale)
12 +IND
11
V–
+INB
–INB
OUTB
10 +INC
9
–INC
ASIC input or output amplifiers
Audio amplifiers
8
OUTC
Photodiode amplifiers
Datapath/mux/switch control
Figure 3. 14-Lead SOIC and TSSOP
GENERAL DESCRIPTION
The AD8646 and the AD8647 are the dual, and the AD8648 is
the quad, rail-to-rail, input and output, single-supply amplifiers
featuring low offset voltage, wide signal bandwidth, low input
voltage, and low current noise. The AD8647 also has a low
power shutdown function.
AD8647/AD8648 offer high output drive capability, which is
excellent for audio line drivers and other low impedance
applications. The AD8646 and AD8648 are available for
automotive applications (see the Ordering Guide).
Applications include portable and low powered instrumenta-
tion, audio amplification for portable devices, portable phone
headsets, barcode scanners, and multipole filters. The ability to
swing rail to rail at both the input and output enables designers
to buffer CMOS ADCs, DACs, ASICs, and other wide output
swing devices in single-supply systems.
The combination of 24 MHz bandwidth, low offset, low noise,
and very low input bias current makes these amplifiers useful in
a wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. AC applications benefit
from the wide bandwidth and low distortion. TheAD8646/
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its 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 and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2010 Analog Devices, Inc. All rights reserved.
AD8646/AD8647/AD8648
TABLE OF CONTENTS
Features .............................................................................................. 1
ESD Caution...................................................................................6
Typical Performance Characteristics ..............................................7
Theory of Operation ...................................................................... 15
Power-Down Operation............................................................ 15
Multiplexing Operation............................................................. 15
Outline Dimensions....................................................................... 16
Ordering Guide .......................................................................... 18
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
REVISION HISTORY
4/10—Rev. C to Rev. D
Revision History: AD8648
Changes to Features Section and General Description Section. 1
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide Section............................................ 18
10/07—Rev. A to Rev. B
Combined with AD8646 ...................................................Universal
Added AD8647 ...................................................................Universal
Deleted Figure 7.................................................................................6
Deleted Figure 11...............................................................................7
Deleted Figure 16 and Figure 17 .....................................................8
Deleted Figure 24...............................................................................9
Deleted Figure 27, Figure 28, Figure 31, and Figure 32 ............ 10
Revision History: AD8646/AD8647/AD8648
2/09—Rev. B to Rev. C
Change to Supply Current Shutdown Mode (AD8647 Only)
Parameter, Table 1............................................................................. 3
Change to Supply Current Shutdown Mode (AD8647 Only)
Parameter, Table 2............................................................................. 5
Added Figure 50; Renumbered Sequentially .............................. 15
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide .......................................................... 18
6/07—Rev. 0 to Rev. A
Changes to General Description .....................................................1
Updated Outline Dimensions....................................................... 12
Changes to Ordering Guide.......................................................... 12
10/07—Revision B: Initial Combined Version
1/06—Revision 0: Initial Version
Revision History: AD8646
10/07—Rev. 0 to Rev. B
Combined with AD8648....................................................Universal
Added AD8647 ...................................................................Universal
Deleted Figure 4 and Figure 7......................................................... 7
Deleted Figure 33............................................................................ 11
8/07—Revision 0: Initial Version
Rev. D | Page 2 of 20
AD8646/AD8647/AD8648
SPECIFICATIONS
VSY = 5 V, VCM = VSY/2, TA = +25oC, unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
Min Typ
Max Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VCM = 0 V to 5 V
−40°C < TA < +125°C
−40°C < TA < +125°C
0.6
2.5
3.2
7.5
1
50
550
0.5
50
250
5
mV
mV
μV/°C
pA
pA
pA
pA
pA
pA
V
Offset Voltage Drift
Input Bias Current
ΔVOS/ΔT
IB
1.8
0.3
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Offset Current
IOS
0.1
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
VCM
CMRR
AVO
0
67
104
VCM = 0 V to 5 V
RL = 2 kΩ, VO = 0.5 V to 4.5 V
84
116
dB
dB
Differential
Common Mode
CDIFF
CCM
2.5
6.7
pF
pF
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
IOUT = 1 mA
4.98 4.99
4.90
4.85 4.92
4.70
V
−40°C < TA < +125°C
IOUT = 10 mA
−40°C < TA < +125°C
IOUT = 1 mA
−40°C < TA < +125°C
IOUT = 10 mA
−40°C < TA < +125°C
Short circuit
V
V
V
mV
mV
mV
mV
mA
Ω
Output Voltage Low
VOL
8.4
20
40
145
200
78
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Isc
ZOUT
120
At 1 MHz, AV = 1
5
Power Supply Rejection Ratio
Supply Current per Amplifier
PSRR
ISY
VSY = 2.7 V to 5.5 V
63
80
1.5
dB
2.0
2.5
mA
mA
nA
−40°C < TA < +125°C
Both amplifiers shut down,
VIN_SDA and VIN_SDB = 0 V
Supply Current Shutdown Mode
(AD8647 Only)
ISD
10
−40°C < TA < +125°C
1
μA
SHUTDOWN INPUTS (AD8647)
Logic High Voltage (Enabled)
Logic Low Voltage (Power-Down)
Logic Input Current (Per Pin)
Output Pin Leakage Current
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
Settling Time
VINH
VINL
IIN
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C (shutdown active)
+2.0
V
V
μA
nA
+0.8
1
1
SR
GBP
Øm
ts
ton
toff
RL = 2 kΩ
11
24
74
0.5
1
V/μs
MHz
Degrees
μs
μs
μs
To 0.1%
Amplifier Turn-On Time (AD8647)
Amplifier Turn-Off Time (AD8647)
25°C, AV = 1, RL = 1 kΩ (see Figure 44)
25°C, AV = 1, RL = 1 kΩ (see Figure 45)
1
Rev. D | Page 3 of 20
AD8646/AD8647/AD8648
Parameter
Symbol
Conditions
Min Typ
Max Unit
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
2.3
8
μV
nV/√Hz
f = 10 kHz
f = 10 kHz
f = 100 kHz
6
nV/√Hz
dB
dB
Channel Separation
CS
−115
−110
Total Harmonic Distortion Plus Noise
THD + N
V p-p = 0.1 V, RL = 600 Ω, f = 25 kHz, TA = 25°C
AV = +1
AV = −10
0.010
0.021
%
%
Rev. D | Page 4 of 20
AD8646/AD8647/AD8648
VSY = 2.7 V, VCM = VSY/2, TA = +25oC, unless otherwise noted.
Table 2.
Parameter
Symbol Conditions
Min Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VCM = 0 V to 2.7 V
−40°C < TA < +125°C
0.6
2.5
3.2
7.0
1
mV
mV
μV/°C
pA
pA
pA
pA
pA
pA
V
Offset Voltage Drift
Input Bias Current
ΔVOS/ΔT −40°C < TA < +125°C
IB
1.8
0.2
−40°C < TA < +85°C
−40°C < TA < +125°C
IOS
−40°C < TA < +85°C
−40°C < TA < +125°C
VCM
50
550
0.5
50
250
2.7
Input Offset Current
0.1
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
0
62
95
CMRR
AVO
VCM = 0 V to 2.7 V
RL = 2 kΩ, VO = 0.5 V to 2.2 V
79
102
dB
dB
Differential
Common Mode
CDIFF
CCM
2.5
7.8
pF
pF
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
VOL
IOUT = 1 mA
−40°C < TA < +125°C
IOUT = 1 mA
−40°C < TA < +125°C
Short circuit
At 1 MHz, AV = 1
2.65 2.68
2.60
11
V
V
mV
mV
mA
Ω
Output Voltage Low
25
30
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Isc
ZOUT
63
5
Power Supply Rejection Ratio
Supply Current per Amplifier
PSRR
ISY
VSY = 2.7 V to 5.5 V
63
80
1.6
dB
2.0
2.5
mA
mA
nA
−40°C < TA < +125°C
Both amplifiers shut down,
VIN_SDA and VIN_SDB = 0 V
Supply Current Shutdown Mode
(AD8647 Only)
ISD
10
−40°C < TA < +125°C
1
ꢀA
SHUTDOWN INPUTS (AD8647)
Logic High Voltage (Enabled)
Logic Low Voltage (Power-Down)
Logic Input Current (Per Pin)
Output Pin Leakage Current
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
Settling Time
VINH
VINL
IIN
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C (shutdown active)
+2.0
V
V
ꢀA
nA
+0.8
1
1
SR
GBP
RL = 2 kΩ
11
24
53
0.3
1.2
1
V/μs
MHz
Degrees
μs
μs
μs
Øm
ts
ton
toff
To 0.1%
Amplifier Turn-On Time (AD8647)
Amplifier Turn-Off Time (AD8647)
NOISE PERFORMANCE
Peak-to-Peak Noise
25°C, AV = 1, RL = 1 kΩ (see Figure 41)
25°C, AV = 1, RL = 1 kΩ (see Figure 42)
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 10 kHz
f = 100 kHz
2.3
8
6
−115
−110
μV
Voltage Noise Density
nV/√Hz
nV/√Hz
dB
Channel Separation
CS
dB
Rev. D | Page 5 of 20
AD8646/AD8647/AD8648
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 3.
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Parameter
Rating
Supply Voltage
6 V
Input Voltage
GND to VSY
3 V
Indefinite
−65°C to +150°C
−40°C to +125°C
300°C
Table 4. Thermal Resistance
Differential Input Voltage
Output Short Circuit to GND
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering 60 sec)
Junction Temperature
Package Type
8-Lead SOIC_N
8-Lead MSOP
θJA
θJC
43
45
44
36
35
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
125
210
200
120
180
10-Lead MSOP
14-Lead SOIC_N
14-Lead TSSOP
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. D | Page 6 of 20
AD8646/AD8647/AD8648
TYPICAL PERFORMANCE CHARACTERISTICS
300
200
180
160
140
120
100
80
V
V
= 2.7V
V
V
= 5V
= 2.5V
SY
SY
= 1.35V
CM
CM
T
= 25°C
T = 25°C
A
A
250
200
150
100
50
2244 AMPLIFIERS
2244 AMPLIFIERS
60
40
20
0
0
–2.0
–1.5
–1.0
–0.5
0
0.5
(mV)
1.0
1.5
2.0
–2.0
–1.5
–1.0
–0.5
0
0.5
(mV)
1.0
1.5
2.0
V
V
OS
OS
Figure 4. Input Offset Voltage Distribution
Figure 7. Input Offset Voltage Distribution
35
30
25
20
15
10
5
35
30
25
20
15
10
5
V
= 2.7V
V
= 5V
SY
SY
–40°C < T < +125°C
–40°C < T < +125°C
A
A
0
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
TCV (µV/°C)
OS
TCV (µV/°C)
OS
Figure 5. VOS Drift (TCVOS) Distribution
Figure 8. VOS Drift (TCVOS) Distribution
2500
2000
1500
1000
500
2500
2000
1500
1000
500
V
T
= 2.7V
= 25°C
V
= 5V
= 25°C
SY
SY
A
T
A
0
0
–500
–500
–1000
–1500
–2000
–2500
–1000
–1500
–2000
–2500
0
1
2
3
4
5
0
0.5
1.0
1.5
2.0
2.5
3.0
INPUT COMMON-MODE VOLTAGE (V)
INPUT COMMON-MODE VOLTAGE (V)
Figure 6. Input Offset Voltage vs. Input Common-Mode Voltage
Figure 9. Input Offset Voltage vs. Input Common-Mode Voltage
Rev. D | Page 7 of 20
AD8646/AD8647/AD8648
10000
10000
1000
100
10
V
= 2.7V
V
= 5V
SY
= 25°C
SY
T = 25°C
A
T
A
1000
100
10
V
– V
OH
SY
V
OL
V
– V
OH
SY
1
1
V
OL
0.1
0.1
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 10. Output Saturation Voltage vs. Load Current
Figure 13. Output Saturation Voltage vs. Load Current
25
20
15
10
5
120
100
80
60
40
20
0
V
= 2.7V
V
= 5V
SY
SY
= 1mA
I
L
V
– V = 10mA
OH
SY
V
– V
OH
SY
V
= 10mA
OL
V
OL
V
– V = 1mA
OH
SY
V
= 1mA
65
OL
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 11. Output Saturation Voltage vs. Temperature
Figure 14. Output Saturation Voltage vs. Temperature
300
250
200
150
100
50
300
250
200
150
100
50
V
= 2.7V
V
= 5V
SY
= 125°C
SY
T = 125°C
A
T
A
0
0
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
COMMON-MODE VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
Figure 12. Input Bias Current vs. Common-Mode Voltage
Figure 15. Input Bias Current vs. Common-Mode Voltage
Rev. D | Page 8 of 20
AD8646/AD8647/AD8648
80
0
80
60
0
V
R
C
= 5V
V
R
C
= 2.7V
= 1kΩ
= 10pF
SY
SY
= 1k
Ω
L
L
L
L
= 10pF
45
90
60
40
20
45
PHASE
40
90
Ф
= 52°
M
20
135
180
225
270
135
Ф
= 74°
M
GAIN
0
0
–20
–40
180
225
270
–20
–40
10k
100k
1M
10M
100M
10k
100k
1M
FREQUENCY (Hz)
10M
100M
FREQUENCY (Hz)
Figure 16. Open-Loop Gain and Phase vs. Frequency
Figure 19. Open-Loop Gain and Phase vs. Frequency
60
40
60
40
V
= 2.7V
V
= 5V
SY
= 25°C
SY
T = 25°C
A
T
A
A
A
= 100
= 10
A
A
= 100
= 10
V
V
V
V
20
20
A
= 1
A
= 1
V
V
0
0
–20
–40
–60
–20
–40
–60
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 17. Closed-Loop Gain vs. Frequency
Figure 20. Closed-Loop Gain vs. Frequency
250
200
150
100
50
120
100
80
60
40
20
0
V
= 2.7V
= 25°C
V
= 5V
SY
SY
T
T = 25°C
A
A
A
= 1
V
A
= 1
V
A
= 10
V
A
= 100
V
A
= 10
V
A
= 100
V
0
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
FREQUENCY (kHz)
FREQUENCY (kHz)
Figure 18. ZOUT vs. Frequency
Figure 21. ZOUT vs. Frequency
Rev. D | Page 9 of 20
AD8646/AD8647/AD8648
100
100
80
60
40
20
0
V
= 2.7V
V
= 5V
= 25°C
SY
= 25°C
SY
T
T
A
A
80
60
40
20
0
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 22. CMRR vs. Frequency
Figure 25. CMRR vs. Frequency
100
80
60
40
20
0
100
80
60
40
20
0
V
= 2.7V
V
T
= 5V
= 25°C
SY
= 25°C
SY
PSRR+
PSRR+
T
A
A
PSRR–
PSRR–
1k
10k
100k
1M
10M
1k
10k
100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 26. PSRR vs. Frequency
Figure 23. PSRR vs. Frequency
70
60
50
40
30
20
10
0
V
R
= 5V
= 10kΩ
= 25°C
V
T
= ±1.35V
SY
SY
= 25°C
L
A
T
60
50
40
30
20
10
0
A
–OS
+OS
OS+
OS–
10
100
1000
1
10
100
1000
C
(pF)
C
(pF)
LOAD
LOAD
Figure 24. Overshoot vs. Load Capacitance
Figure 27. Overshoot vs. Load Capacitance
Rev. D | Page 10 of 20
AD8646/AD8647/AD8648
V
= 2.7V, V
CM
= 1.35V, V = 100mV p-p,
IN
V
= 5V, V
CM
= 2.5V, V = 100mV p-p,
IN
SY
= 25°C, R = 10kΩ, C = 100pF
SY
T = 25°C, R = 10kΩ, C = 100pF
A
T
A
L
L
L
L
(200ns/DIV)
(200ns/DIV)
Figure 28. Small-Signal Transient Response
Figure 31. Small-Signal Transient Response
V
= 2.7V, V = 2V p-p,
IN
V
= 5V, V = 4V p-p,
IN
SY
= 25°C, R = 10kΩ, C = 100pF
SY
T = 25°C, R = 10kΩ, C = 100pF
A
T
A
L
L
L
L
(200ns/DIV)
(200ns/DIV)
Figure 29. Large-Signal Transient Response
Figure 32. Large-Signal Transient Response
0.08
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
V
= ±2.5V
= 600Ω
= 1
V
= ±2.5V
= 600Ω
= –10
SY
SY
R
A
R
A
L
V
A
L
V
A
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
T
= 25°C
T
= 25°C
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 30. THD + Noise vs. Frequency
Figure 33. THD + Noise vs. Frequency
Rev. D | Page 11 of 20
AD8646/AD8647/AD8648
1
V
= 2.7V TO 5V
SY
= 25°C
T
A
0.1
0.01
0.001
V
A
= 5V
SY
= 1
V
BW = 30kHz
R
= 100kΩ
L
f = 1kHz
0.0001
0.001
0.01
0.1
1
TIME (1s/DIV)
OUTPUT AMPLITUDE (V rms)
Figure 34. 0.1 Hz to 10 Hz Voltage Noise
Figure 37. THD + Noise vs. Output Amplitude
1000
100
1000
100
10
V
= 5V
V
= 2.7V TO 5V
SY
SY
= 25°C
T
A
10
1
0.1
25
1
10
100
1k
10k
45
65
80
105
125
TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 35. Voltage Noise Density vs. Frequency
Figure 38. Input Bias Current vs. Temperature
2.5
2.0
1.5
1.0
0.5
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
T
= 25°C
V
V
A
R
= 5V
= 4.9V
= 1
= 10kΩ
= 25°C
A
SY
IN
V
L
T
A
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
100
1k
10k
FREQUENCY (kHz)
SUPPLY VOLTAGE (V)
Figure 36. Supply Current per Amplifier vs. Supply Voltage
Figure 39. Maximum Output Swing vs. Frequency
Rev. D | Page 12 of 20
AD8646/AD8647/AD8648
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
–20
V
= 5V
= 2kΩ
= –100
= 25°C
SY
R1
V
= V /2
SY
OUT
CS (dB) = 20 log (VOUT/100 = VIN
V+
)
20Ω
R
A
L
V
A
V–
U2
R2
T
200Ω
3
6
7
U1
5
V+
V–
+
–
V–
V+
VIN
2
–40
R3
2kΩ
0
0
0
V–
V+
0
V
= 2.7V
SY
–60
V
= 5V
SY
–80
V
= 2V p-p
IN
–100
V
= 0.5V p-p
IN
–120
–40
–20
0
20
40
60
80
100
120
1k
10k
FREQUENCY (Hz)
100k
TEMPERATURE (°C)
Figure 40. Supply Current per Amplifier vs. Temperature
Figure 43. Channel Separation
V
= 5V
= 1kΩ
= 1
SY
SHUTDOWN PIN
SHUTDOWN PIN
R
A
L
V
A
V
R
A
= 2.7V
= 1kΩ
= 1
SY
T
= 25°C
L
V
A
T
= 25°C
AMPLIFIER OUTPUT
AMPLIFIER OUTPUT
TIME (200ns/DIV)
TIME (200ns/DIV)
Figure 41. Turn-On Time
Figure 44. Turn-On Time
V
= 2.7V
SY
V
= 5V
= 1kΩ
= 1
SY
R
A
T
= 1kΩ
= 1
R
A
T
L
V
L
V
= 25°C
= 25°C
A
A
SHUTDOWN PIN
SHUTDOWN PIN
AMPLIFIER OUTPUT
AMPLIFIER OUTPUT
TIME (200ns/DIV)
TIME (200ns/DIV)
Figure 45. Turn-Off Time
Figure 42. Turn-Off Time
Rev. D | Page 13 of 20
AD8646/AD8647/AD8648
100
100
10
V
= 2.7V
V
= 5V
SY
SY
10
1
1
0.1
0.01
0.1
0.01
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 46. Supply Current with Op-Amp Shutdown vs. Temperature
Figure 47. Supply Current with Op-Amp Shutdown vs. Temperature
Rev. D | Page 14 of 20
AD8646/AD8647/AD8648
THEORY OF OPERATION
POWER-DOWN OPERATION
The shutdown function of the AD8647 is referenced to the
negative supply voltage of the operational amplifier. A logic
level high (> 2.0 V) enables the device, while a logic level low
(< 0.8 V) disables the device and places the output in a high
impedance condition. Several outputs can be wire-OR’ed, thus
eliminating a multiplexer. The logic input is a high impedance
CMOS input. If dual or split supplies are used, the logic signals
must be properly referred to the negative supply voltage.
2V
1V
0V
5V
0V
MULTIPLEXING OPERATION
Because each op amp has a separate logic input enable pin, the
outputs can be connected together if it can be guaranteed that
only one op amp is active at any time. By connecting the op amps
as shown in Figure 48, a multiplexer can be eliminated. With
the reasonably short turn-on and turn-off times, low frequency
signal paths can be smoothly selected. The turn-off time is
slightly faster than the turn-on time so, even when using
sections from two different packages, the overlap is less than
300 nanoseconds.
TIME (200µs/DIV)
Figure 49. Switching Waveforms
80
70
60
50
40
30
20
10
0
1/2
AD8647
8
9
7
6
5kHz
5V
V
= 5V
SY
1/2
AD8647
V
= 2.7V
0.9
SY
2
3
10
1
–10
0
0.1
0.2
0.3
V
0.4
0.5
0.6
0.7
(V)
0.8
1.0
5
AND V
IN_SDA
IN_SDB
4
13kHz
2kHz
Figure 50. Supply Current Shutdown Mode, AD8647
1
2
Figure 48. AD8647 Output Switching
Rev. D | Page 15 of 20
AD8646/AD8647/AD8648
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2441)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
0.50 (0.0196)
0.25 (0.0099)
1.27 (0.0500)
BSC
45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 51. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
3.20
3.00
2.80
8
1
5
4
5.15
4.90
4.65
3.20
3.00
2.80
PIN 1
IDENTIFIER
0.65 BSC
0.95
0.85
0.75
15° MAX
1.10 MAX
0.80
0.55
0.40
0.15
0.05
0.23
0.09
6°
0°
0.40
0.25
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 52. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
Rev. D | Page 16 of 20
AD8646/AD8647/AD8648
3.10
3.00
2.90
10
1
6
5
5.15
4.90
4.65
3.10
3.00
2.90
PIN 1
IDENTIFIER
0.50 BSC
0.95
0.85
0.75
15° MAX
1.10 MAX
0.70
0.55
0.40
0.15
0.05
0.23
0.13
6°
0°
0.30
0.15
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-BA
Figure 53. 10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters
5.10
5.00
4.90
14
8
4.50
4.40
4.30
6.40
BSC
1
7
PIN 1
0.65 BSC
1.05
1.00
0.80
1.20
MAX
0.20
0.09
0.75
0.60
0.45
8°
0°
0.15
0.05
COPLANARITY
0.10
SEATING
PLANE
0.30
0.19
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 54. 14-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-14)
Dimensions shown in millimeters
Rev. D | Page 17 of 20
AD8646/AD8647/AD8648
8.75 (0.3445)
8.55 (0.3366)
8
7
14
1
6.20 (0.2441)
5.80 (0.2283)
4.00 (0.1575)
3.80 (0.1496)
1.27 (0.0500)
BSC
0.50 (0.0197)
0.25 (0.0098)
45°
1.75 (0.0689)
1.35 (0.0531)
0.25 (0.0098)
0.10 (0.0039)
8°
0°
COPLANARITY
0.10
SEATING
PLANE
1.27 (0.0500)
0.40 (0.0157)
0.51 (0.0201)
0.31 (0.0122)
0.25 (0.0098)
0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-AB
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 55. 14-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-14)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model1, 2
AD8646ARZ
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead MSOP
Package Option
R-8
R-8
Branding
AD8646ARZ-REEL
AD8646ARZ-REEL7
AD8646ARMZ
AD8646ARMZ-REEL
AD8646WARZ-RL
AD8646WARZ-R7
AD8646WARMZ-RL
AD8646WARMZ-R7
AD8647ARMZ
AD8647ARMZ-REEL
AD8648ARZ
AD8648ARZ-REEL
AD8648ARZ-REEL7
AD8648ARUZ
R-8
RM-8
RM-8
R-8
A1V
A1V
8-Lead MSOP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead MSOP
R-8
RM-8
RM-8
RM-10
RM-10
R-14
R-14
R-14
RU-14
RU-14
RU-14
RU-14
A1V
A1V
A1W
A1W
8-Lead MSOP
10-Lead MSOP
10-Lead MSOP
14-Lead SOIC_N
14-Lead SOIC_N
14-Lead SOIC_N
14-Lead TSSOP
14-Lead TSSOP
14-Lead TSSOP
14-Lead TSSOP
AD8648ARUZ-REEL
AD8648WARUZ
AD8648WARUZ-RL
1 Z = RoHS Compliant Part
2 W = Qualified for Automotive Applications.
Rev. D | Page 18 of 20
AD8646/AD8647/AD8648
NOTES
Rev. D | Page 19 of 20
AD8646/AD8647/AD8648
NOTES
©2006–2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06527-0-4/10(D)
Rev. D | Page 20 of 20
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