ANALOG DEVICES AD8691, AD8692, AD8694 Service Manual
Low Cost, Low Noise, CMOS Rail-to-Rail
O
O
www.BDTIC.com/ADI
FEATURES
Offset voltage: 400 μV typical
Low offset voltage drift: 6 μV/°C maximum
(
AD8692/AD8694)
Very low input bias currents: 1 pA maximum
Low noise: 8 nV/√Hz
Low distortion: 0.0006%
Wide bandwidth: 10 MHz
Unity-gain stable
Single-supply operation: 2.7 V to 6 V
APPLICATIONS
Photodiode amplification
Battery-powered instrumentation
Medical instruments
Multipole filters
Sensors
Portable audio devices
GENERAL DESCRIPTION
The AD8691, AD8692, and AD8694 are low cost, single, dual,
and quad rail-to-rail output, single-supply amplifiers featuring
low offset and input voltages, low current noise, and wide signal
bandwidth. The combination of low offset, low noise, very low
input bias currents, and high speed make these amplifiers useful
in a wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from this
combination of performance features. Audio and other ac
applications benefit from the wide bandwidth and low
distortion of these devices.
Applications for these amplifiers include power amplifier (PA)
ontrols, laser diode control loops, portable and loop-powered
c
instrumentation, audio amplification for portable devices, and
ASIC input and output amplifiers.
The small SC70 and TSOT package options for the AD8691
llow it to be placed next to sensors, thereby reducing external
a
noise pickup.
The AD8691, AD8692, and AD8694 are specified over the
ended industrial temperature range of −40°C to +125°C.
ext
The AD8691 single is available in 5-lead SC70 and 5-lead TSOT
packages. The AD8692 dual is available in 8-lead MSOP and
narrow SOIC surface-mount packages. The AD8694 quad is
available in 14-lead TSSOP and narrow 14-lead SOIC packages.
Output Operational Amplifiers
AD8691/AD8692/AD8694
PIN CONFIGURATIONS
UT
1
AD8691
2
V–
TOP VIEW
(Not to Scal e)
3
+IN
Figure 1. 5-Lead TSOT
UT A
+IN A
AD8691
1
2
V–
3
Figure 2. 5-Lead SC70
OUT A
1
AD8692
2
–IN A
+IN A
V–
TOP VIEW
3
(Not to Scale)
4
Figure 3. 8-Lead MSOP
OUT A
1
AD8692
2
–IN A
3
+IN A
V–
TOP VIEW
(Not to Scale)
4
Figure 4. 8-Lead SOIC
OUT A
1
–IN A
2
+IN A
3
AD8694
TOP VIEW
V+
4
(Not to Scal e)
5
+IN B
6
–IN B
OUT B
7
Figure 5. 14-Lead SOIC
1
OUT A
2
–IN A
3
+IN A
V+
+IN B
–IN B
OUT B
AD8694
TOP VIEW
4
(Not to Scale)
5
6
7
Figure 6. 14-Lead TSSOP
14
13
12
11
10
9
8
5
4
5
4
8
7
6
5
8
7
6
5
14
13
12
11
10
9
8
V+
–IN
V+
–IN
V+
OUT B
–IN B
+IN B
V+
OUT B
–IN B
+IN B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
04991-030
04991-031
04991-001
04991-002
04991-032
04991-033
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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 registered trademarks 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 www.analog.com
Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.
AD8691/AD8692/AD8694
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Electrical Characteristics ................................................................. 3
REVISION HISTORY
5/07—Rev. B to Rev. C
Change to Figure 1 ........................................................................... 1
Changes to Large Signal Voltage Gain Values in Table 1 ............ 3
Change to Phase Margin Symbol in Table 1 ................................. 3
Change to TA Value for Table 2...................................................... 4
Changes to Large Signal Voltage Gain Values in Table 2 ............ 4
Change to Phase Margin Symbol in Table 2 ................................. 4
Changes to Table 4............................................................................ 5
Changes to Outline Dimensions................................................... 11
Changes to Ordering Guide.......................................................... 12
3/05—Rev. A to Rev. B
Added AD8694 ...................................................................Universal
1/05—Rev. 0 to Rev. A
Added AD8691 ...................................................................Universal
Changes to Features.......................................................................... 1
Added Figure 1 and Figure 2........................................................... 1
Changes to Electrical Characteristics ............................................ 3
Changes to Figure 6 caption............................................................ 6
Changes to Figure 9.......................................................................... 6
Updated Outline Dimensions....................................................... 11
Changes to Ordering Guide.......................................................... 11
10/04—Revision 0: Initial Version
Absolute Maximum Ratings ............................................................5
Thermal Characteristics ...............................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics..............................................6
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 12
Rev. C | Page 2 of 12
AD8691/AD8692/AD8694
www.BDTIC.com/ADI
ELECTRICAL CHARACTERISTICS
VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
V
Input Bias Current IB 0.2 1 pA
−40°C < TA < +85°C 50 pA
−40°C < TA < +125°C 260 pA
Input Offset Current IOS 0.1 0.5 pA
−40°C < TA < +85°C 20 pA
−40°C < TA < +125°C 75 pA
Input Voltage Range −0.3 +1.6 V
Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +1.6 V 68 90 dB
VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C 60 85 dB
Large Signal Voltage Gain AVO
AD8691/AD8692 RL = 2 kΩ, VO = 0.5 V to 2.2 V 90 250 V/mV
AD8694 RL = 2 kΩ, VO = 0.5 V to 2.2 V 60 V/mV
Offset Voltage Drift ∆VOS/∆T
AD8691 2 12 μV/°C
AD8692/AD8694 1.3 6 μV/°C
INPUT CAPACITANCE
Common-Mode Input Capacitance C
Differential Input Capacitance C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
−40°C < TA < +125°C 2.6 V
Output Voltage Low VOL I
−40°C < TA < +125°C 60 mV
Short-Circuit Current ISC ±20 mA
Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 95 dB
−40°C < TA < +125°C 75 95 dB
Supply Current/Amplifier ISY V
−40°C < TA < +125°C 1.2 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 5 V/μs
Settling Time tS To 0.01% 1 μs
Gain Bandwidth Product GBP 10 MHz
Phase Margin Øm 60 Degrees
Total Harmonic Distortion + Noise THD + N
NOISE PERFORMANCE
Voltage Noise e
Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz
e
Current Noise Density in f = 1 kHz 0.05 pA/√Hz
CM
DM
f = 1 MHz, AV = 1 12 Ω
OUT
f = 0.1 Hz to 10 Hz 1.6 3.0 μV p-p
n p-p
f = 10 kHz 6.5 nV/√Hz
n
= −0.3 V to +1.6 V 0.4 2.0 mV
CM
= −0.1 V to +1.6 V; −40°C < TA < +125°C 3.0 mV
CM
5 pF
2.5 pF
= 1 mA 2.64 2.66 V
L
= 1 mA 25 40 mV
L
= 0 V 0.85 0.95 mA
O
G = 1, RL = 600 Ω, f = 1 kHz, VO = 250 mV p-p
0.003 %
Rev. C | Page 3 of 12
AD8691/AD8692/AD8694
www.BDTIC.com/ADI
VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
V
Input Bias Current IB 0.2 1 pA
−40°C < TA < +85°C 50 pA
−40°C < TA < +125°C 260 pA
Input Offset Current IOS 0.1 0.5 pA
−40°C < TA < +85°C 20 pA
−40°C < TA < +125°C 75 pA
Input Voltage Range
Common-Mode Rejection Ratio CMRR VCM = −0.3 V to +3.9 V 70 95 dB
V
Large Signal Voltage Gain AVO
AD8691/AD8692 VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V 250 2000 V/mV
AD8694 VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V 150 V/mV
Offset Voltage Drift
AD8691 2 12 μV/°C
AD8692/AD8694 1.3 6 μV/°C
INPUT CAPACITANCE
Common-Mode Input Capacitance C
Differential Input Capacitance C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
I
−40°C to +125°C 4.6 V
Output Voltage Low VOL I
AD8691/AD8692 IL = 10 mA 165 210 mV
AD8694 IL = 10 mA 185 240 mV
AD8691/AD8692 −40°C to +125°C 290 mV
AD8694 −40°C to +125°C 370 mV
Short-Circuit Current ISC ±80 mA
Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 80 95 dB
−40°C < TA < +125°C 75 95 dB
Supply Current/Amplifier ISY V
−40°C < TA < +125°C 1.3 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 5 V/μs
Settling Time tS To 0.01% 1 μs
Full Power Bandwidth BWP <1% distortion 360 kHz
Gain Bandwidth Product GBP 10 MHz
Phase Margin Øm 65 Degrees
Total Harmonic Distortion + Noise THD + N
NOISE PERFORMANCE
Voltage Noise e
Voltage Noise Density en f = 1 kHz 8 12
e
Current Noise Density in f = 1 kHz 0.05
∆VOS/∆T
CM
DM
f = 1 MHz, AV = 1 10 Ω
OUT
f = 0.1 Hz to 10 Hz 1.6 3.0 μV p-p
n p-p
f = 10 kHz 6.5
n
= −0.3 V to +3.9 V 0.4 2.0 mV
CM
= −0.1 V to +3.9 V; −40°C < TA < +125°C 3.0 mV
CM
+3.9 V
−0.3
= −0.1 V to +3.9 V; −40°C < TA < +125°C 67 95 dB
CM
5 pF
2.5 pF
= 1 mA 4.96 4.98 V
L
= 10 mA 4.7 4.78 V
L
= 1 mA 20 40 mV
L
= 0 V 0.95 1.05 mA
O
G = 1, R
= 600 Ω, f = 1 kHz, VO = 1 V p-p
L
0.0006 %
nV/√Hz
nV/√Hz
pA/√Hz
Rev. C | Page 4 of 12
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