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AD8622
Service Manual
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ANALOG DEVICES AD8622, AD8624 Service Manual

Low Power, Precision
AD8622/AD8624
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8622
TOP VIEW
(Not to Scale)
07527-001
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8622
TOP VIEW
(Not to S cale)
07527-002
07527-067
AD8624
1
2
3
4
5
6
7
14
13
12
11
10
9
8
TOP VIEW
(Not to S cale)
OUT A
OUT D –IN D +IN D V– +IN C –IN C OUT C
–IN A +IN A
V+ +IN B –IN B
OUT B
07527-068
NOTES
1. NC = NO CONNECT.
2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE CONNECTE D TO V–.
12 11 10
1
3 4
–IN D +IN D V–
9
+IN C
–IN A
V+
2
+IN A
+IN B
6OUT B
5–IN B
7OUT C
8
–IN C
16
NC
15
OUT A
14
OUT D
13
NC
TOP VIEW
(Not to Scale)
AD8624

FEATURES

Very low offset voltage
125 μV maximum Supply current: 215 μA/amp typical Input bias current: 200 pA maximum Low input offset voltage drift: 1.2 μV/°C maximum Very low voltage noise: 11 nV/√Hz Operating temperature: −40°C to +125°C Rail-to-rail output swing Unity gain stable ±2.5 V to ±15 V operation

APPLICATIONS

Portable precision instrumentation Laser diode control loops Strain gage amplifiers Medical instrumentation Thermocouple amplifiers
Rail-to-Rail Output Op Amp

PIN CONFIGURATIONS

Figure 1. 8-Lead Narrow-Body SOIC
Figure 2. 8-Lead MSOP

GENERAL DESCRIPTION

The AD8622/AD8624 are dual and quad precision rail-to-rail output operational amplifiers with low supply currents of only 350 µA/amplifier maximum over temperature and supply voltages. The AD8622/AD8624 also has an input bias current cancellation circuitry that provides a very low input bias current over the full operating temperature.
With a typical offset voltage of only 10 µV, offset drift of 0.5 µV/°C, and noise of only 0.2 μV p-p (0.1 Hz to 10 Hz), they are perfectly suited for applications where large error sources cannot be tolerated. Many systems can take advantage of the low noise, dc precision, and rail-to-rail output swing provided by the AD8622/AD8624 to maximize the signal-to-noise ratio and dynamic range for low power operation. The AD8622/
AD8624 are specified for the extended industrial temperature
range of −40°C to +125°C. The AD8622 is available in lead-free 8-lead SOIC and MSOP packages, while the AD8624 is available in lead-free 14-lead TSSOP and 16-lead LFCSP packages.
Rev. C
Figure 3. 14-Lead TSSOP
Figure 4. 16-Lead LFCSP
Table 1. Low Power Op Amps
Supply 40 V 36 V 12 V to 18 V 6 V
Single OP97 OP777 AD8663 OP1177 Dual OP297 OP727 AD8667 ADA4692-2 OP2177 Quad OP497 OP747 AD8669 ADA4692-4 OP4177
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2009–2011 Analog Devices, Inc. All rights reserved.
www.analog.com
AD8622/AD8624
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics—±2.5 V Operation .......................... 3
Electrical Characteristics—±15 V Operation ........................... 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5

REVISION HISTORY

6/11—Rev. B to Rev. C
Changes to Figure 13 ........................................................................ 7
2/10—Rev. A to Rev. B
Changed 16-Lead to 14-Lead in Figure 62 Caption ................... 19
1/10—Rev. 0 to Rev. A
Added 14-Lead TSSOP ...................................................... Universal
Added 16-Lead LFCSP ....................................................... Universal
Added Figure 3 and Figure 4; Renumbered Sequentially ........... 1
Changes to Table 5 ............................................................................ 5
Changes to Figure 10 to Figure 16 .................................................. 6
Changes to Figure 26 ........................................................................ 9
Changes to Figure 29 ...................................................................... 10
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
7/09—Revision 0: Initial Version
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Applications Information .............................................................. 15
Input Protection ......................................................................... 15
Phase Reversal ............................................................................ 15
Micropower Instrumentation Amplifier ................................. 15
Hall Sensor Signal Conditioning .............................................. 16
Simplified Schematic ...................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 19
Rev. C | Page 2 of 20
AD8622/AD8624
n_uncorr

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS—±2.5 V OPERATION

VSY = ±2.5 V, VCM = 0 V, TA = 25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 10 125 μV
−40°C ≤ TA ≤ +125°C 230 μV Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.5 1.2 µV/°C Input Bias Current IB 30 200 pA
−40°C ≤ TA ≤ +125°C 400 pA Input Offset Current IOS 25 200 pA
−40°C ≤ TA ≤ +125°C 300 pA Input Voltage Range −40°C ≤ TA ≤ +125°C −1.3 +1.3 V Common-Mode Rejection Ratio CMRR VCM = −1.3 V to +1.3 V 110 120 dB
−40°C ≤ TA ≤ +125°C 107 dB Open-Loop Gain AVO RL = 10 kΩ, VO = −2.0 V to +2.0 V 118 135 dB
−40°C ≤ TA ≤ +125°C 109 dB Input Resistance, Differential Mode R Input Resistance, Common Mode R Input Capacitance, Differential Mode C Input Capacitance, Common Mode C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 2.45 2.49 V
−40°C ≤ TA ≤ +125°C 2.41 V RL = 10 kΩ to ground 2.40 2.45 V
−40°C ≤ TA ≤ +125°C 2.36 V Output Voltage Low VOL RL = 100 kΩ to ground −2.49 −2.45 V
−40°C ≤ TA ≤ +125°C −2.41 V RL = 10 kΩ to ground −2.45 −2.40 V
−40°C ≤ TA ≤ +125°C −2.36 V Short-Circuit Current ISC ±30 mA Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±2.0 V to ±18.0 V 125 145 dB
−40°C ≤ TA ≤ +125°C 120 dB Supply Current/Amplifier ISY IO = 0 mA 175 225 μA
−40°C ≤ TA ≤ +125°C 310 μA DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ, CL = 100 pF AV = 1 0.28 V/μs Gain Bandwidth Product
Phase Margin ΦM RL = 10 kΩ, CL = 20 pF, AV = 1 74 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density en f = 1 kHz 12 nV/√Hz Uncorrelated Current Noise Density i Correlated Current Noise Density i
1 GΩ
INDM
1 TΩ
INCM
5.5 pF
INDM
3 pF
INCM
f = 1 kHz, AV = 1 2 Ω
OUT
GBP R
= 10 kΩ, CL = 20 pF, AV = 1
L
540
f = 1 kHz 0.15 pA/√Hz
f = 1 kHz 0.07 pA/√Hz
n_corr
kHz
Rev. C | Page 3 of 20
AD8622/AD8624
INDM
OUT
n_corr

ELECTRICAL CHARACTERISTICS—±15 V OPERATION

VSY = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise specified.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 10 125 μV
−40°C ≤ TA ≤ +125°C 230 μV Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.5 1.2 μV/°C Input Bias Current IB 45 200 pA
−40°C ≤ TA ≤ +125°C 500 pA Input Offset Current IOS 35 200 pA
−40°C ≤ TA ≤ +125°C 500 pA Input Voltage Range −13.8 +13.8 V Common-Mode Rejection Ratio CMRR VCM = −13.8 V to +13.8 V 125 135 dB
−40°C ≤ TA ≤ +125°C 112 dB Open-Loop Gain AVO RL = 10 kΩ, VO = −13.5 V to +13.5 V 125 137 dB
−40°C ≤ TA ≤ +125°C 120 dB Input Resistance, Differential Mode R Input Resistance, Common Mode R Input Capacitance, Differential Mode C Input Capacitance, Common Mode C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 14.94 14.97 V
−40°C ≤ TA ≤ +125°C 14.84 V RL = 10 kΩ to ground 14.86 14.89 V
−40°C ≤ TA ≤ +125°C 14.75 V Output Voltage Low VOL RL = 100 kΩ to ground −14.97 −14.94 V
−40°C ≤ TA ≤ +125°C −14.92 V RL = 10 kΩ to ground −14.89 −14.90 V
−40°C ≤ TA ≤ +125°C −14.80 V Short-Circuit Current ISC ±40 mA Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±2.0 V to ±18.0 V 125 145 dB
−40°C ≤ TA ≤ +125°C 120 dB Supply Current/Amplifier ISY IO = 0 mA 215 250 μA
−40°C ≤ TA ≤ +125°C 350 μA DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ, CL = 100 pF, AV = 1 0.48 V/μs Gain Bandwidth Product
Phase Margin ΦM RL = 10 kΩ, CL = 20 pF, AV = 1 75 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 0.2 μV p-p Voltage Noise Density en f = 1 kHz 11 nV/√Hz Uncorrelated Current Noise Density i Correlated Current Noise Density i
1 GΩ
1 TΩ
INCM
5.5 pF
INDM
3 pF
INCM
f = 1 kHz, AV = 1 1.5 Ω
GBP R
n_uncorr
= 10 kΩ, CL = 20 pF, AV = 1
L
f = 1 kHz 0.15 pA/√Hz
560
f = 1 kHz 0.06 pA/√Hz
kHz
Rev. C | Page 4 of 20
AD8622/AD8624

ABSOLUTE MAXIMUM RATINGS

Table 2.
Parameter Rating
Supply Voltage ±18 V Input Voltage ±VSY Input Current1 ±10 mA Differential Input Voltage2 ±10 V Output Short-Circuit Duration to GND Indefinite Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Junction Temperature Range −65°C to +150°C Lead Temperature (Soldering, 60 sec) 300°C
1
The input pins have clamp diodes to the power supply pins. The input
current should be limited to 10 mA or less whenever input signals exceed the power supply rail by 0.5 V.
2
Differential input voltage is limited to 10 V or the supply voltage, whichever is less.
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.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. This was measured using a standard 4-layer board.
Table 3. Thermal Resistance
Package Type θJA θJC Unit
8-Lead SOIC_N (R-8) 120 45 °C/W 8-Lead MSOP (RM-8) 142 45 °C/W 14-Lead TSSOP (RU-14) 112 35 °C/W 16-Lead LFCSP (CP-16-17) 55 14 °C/W

ESD CAUTION

Rev. C | Page 5 of 20
AD8622/AD8624
60
50
40
30
20
10
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
V
OS
(µV)
NUMBER OF AMP LIFIERS
07527-065
V
SY
= ±2.5V
V
CM
= 0V
60
50
40
30
20
10
0
0 0.2
0.4 0.6 0.8 1.0 1.2 TCV
OS
(µV/°C)
NUMBER OF AMP LIFIERS
07527-066
VSY = ±2.5V
–40°C ≤ T
A
≤ +125°C
50
40
30
20
10
0
–10
–20 –30
–40
–50
–2.5 –1.5 –0.5 0.5 1.5 2.5
VCM (V)
V
OS
(µV)
07527-007
+85°C
+25°C
–40°C
+125°C
V
SY
= ±2.5V
60
50
40
30
20
10
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
V
OS
(µV)
NUMBER OF AMP LIFIERS
07527-063
VSY = ±15V V
CM
= 0V
60
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1.0 1.2
TCV
OS
(µV/°C)
NUMBER OF AMP LIFIERS
07527-064
VSY = ±15V
–40°C ≤ T
A
≤ +125°C
50
40
30
20
10
0
–10
–20 –30
–40
–50
–15 –10 –5 0 5 10 +15
V
CM
(V)
V
OS
(µV)
07527-004
VSY = ±15V
+85°C
+25°C
–40°C
+125°C

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.
Figure 5. Input Offset Voltage Distribution
Figure 6. Input Offset Voltage Drift Distribution
Figure 8. Input Offset Voltage Distribution
Figure 9. Input Offset Voltage Drift Distribution
Figure 7. Input Offset Voltage vs. Common-Mode Voltage
Figure 10. Input Offset Voltage vs. Common-Mode Voltage
Rev. C | Page 6 of 20
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