ANALOG DEVICES AD8202 Service Manual
Single-Supply Difference Amplifier
AD8202
Rev. F
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A1
+IN
–IN
200kΩ200kΩ
100kΩ
A2
+IN
–IN
G = ×10
G = ×2
AD8202
10kΩ
10kΩ
+IN
–IN
GND
OUT
NC A1
A2
+V
S
NC = NO CONNECT
2
5
647
8
1
3
04981-001
GND
NC
–IN
+IN
A1
+V
S
A2
OUT
AD8202
5V
OUTPUT
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
COMMON
NC = NO CONNECT
04981-002
GND
NC
–IN
+IN
A1
+V
S
A2
OUT
AD8202
5V
OUTPUT
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
COMMON
NC = NO CONNECT
04981-003
Data Sheet
FEATURES
High common-mode voltage range
−8 V to +28 V at a 5 V supply voltage
Operating temperature range: −40°C to +125°C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (1-pole or 2-pole)
Excellent ac and dc performance
±1 mV voltage offset
±1 ppm/°C typical gain drift
80 dB CMRR min dc to 10 kHz
Qualified for automotive applications
High Common-Mode Voltage,
FUNCTIONAL BLOCK DIAGRAMS
APPLICATIONS
Transmission control
Diesel injection control
Engine management
Adaptive suspension control
Vehicle dynamics control
GENERAL DESCRIPTION
The AD8202 is a single-supply difference amplifier for amplifying
and low-pass filtering small differential voltages in the presence of a
large common-mode voltage (CMV). The input CMV range
extends from −8 V to +28 V at a typical supply voltage of 5 V.
The AD8202 is available in die and packaged form. The MSOP
and SOIC packages are specified over a wide temperature range,
from −40°C to +125°C, making the AD8202 well-suited for use
in many automotive platforms.
Automotive platforms demand precision components for
better system control. The AD8202 provides excellent ac and
dc performance keeping errors to a minimum in the user’s
system. Typical offset and gain drift in the SOIC package are
0.3 µV/°C and 1 ppm/°C, respectively. Typical offset and gain
drift in the MSOP package are 2 µV/°C and 1 ppm/°C, respectively. The device also delivers a minimum CMRR of 80 dB
from dc to 10 kHz.
Figure 1. SOIC (R) Package Die Form
Figure 2. High Line Current Sensor
The AD8202 features an externally accessible 100 kΩ resistor
at the output of the Preamp A1 that can be used for low-pass
filter applications and for establishing gains other than 20.
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. Specificati ons subject to change without no tice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 © 2004-2
Figure 3. Low Line Current Sensor
www.analog.com
012 Analog Devices, Inc. All rights reserved.
AD8202 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Theory of Operation ...................................................................... 12
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Single Supply ................................................................................. 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
4/12—Rev. E to Rev. F
Changes to Table 3 and Figure 5 ..................................................... 5
10/11—Rev. D to Rev. E
Change to Features Section ............................................................. 1
Changes to Ordering Guide .......................................................... 17
Updated Outline Dimensions ....................................................... 17
Added Automotive Products Section .......................................... 17
11/05—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Typical Performance Characteristics ........................ 6
Added Figure 18 ................................................................................ 8
Added Figure 25 to Figure 27 .......................................................... 9
Added Figure 32 .............................................................................. 10
Added Figure 37 to Figure 39 ........................................................ 11
Changes to Theory of Operation .................................................. 12
Added Figure 41 .............................................................................. 13
2/05—Rev. B to Rev. C
Changes to Table 1 ............................................................................ 3
Changes to Figure 14 ........................................................................ 8
Changes to Figure 22 ........................................................................ 9
Applications ..................................................................................... 14
Current Sensing .......................................................................... 14
Gain Adjustment ........................................................................ 14
Gain Trim .................................................................................... 15
Low-Pass Filtering ...................................................................... 15
High Line Current Sensing with LPF and Gain Adjustment 16
Driving Charge Redistribution ADCs ..................................... 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
Automotive Products ................................................................. 17
1/05—Rev. A to Rev. B
Changes to the General Description ............................................... 1
Changes to Specifications ................................................................. 3
Added Figure 14 to Figure 33 .......................................................... 8
Changes to Figure 38 ...................................................................... 14
Changes to Figure 40 and Figure 41............................................. 15
Changes to Ordering Guide .......................................................... 16
11/04—Rev. 0 to Rev. A
Changes to the Features .................................................................... 1
Changes to the General Description ............................................... 1
Changes to Specifications (Table 1) ................................................ 3
Changes to Absolute Maximum Ratings (Table 2) ....................... 4
Changes to Pin Function Descriptions (Table 3) .......................... 5
Changes to Figure 5 ........................................................................... 5
Changes to Figure 9 and Figure 10 .................................................. 6
Updated Outline Dimensions ....................................................... 12
Changes to the Ordering Guide ................................................... 12
7/04—Revision 0: Initial Version
Rev. F | Page 2 of 20
Data Sheet AD8202
Initial
20
20
20 V/V
OUT
CMV
Continuous
−8 +28
−8 +28
−8 +28
V
Gain
2 2 2 V/V
OUT
OUT
OUT
For Specified Performance
−40 +125
−40 +125
−40 +150
°C
SPECIFICATIONS
SINGLE SUPPLY
TA = operating temperature range, VS = 5 V, unless otherwise noted.
Table 1.
AD8202 SOIC AD8202 MSOP AD8202 Die
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit
SYSTEM GAIN
Error 0.02 ≤ V
≤ 4.8 V dc @ 25°C −0.3 +0.3 −0.3 +0.3 %
vs. Temperature 1 20 1 25 1 30 ppm/°C
VOLTAGE OFFSET
Input Offset (RTI) VCM = 0.15 V; 25°C −1 +1 −2 +2 −1 +1 mV
vs. Temperature −40°C to +125°C −10 +0.3 +10 −20 +2 +20 −10 +0.3 +10 µV/°C
−40°C to +150°C −15 +5 +15 µV/°C
INPUT
Input Impedance
Differential 260 325 390 260 325 390 260 325 390 kΩ
Common Mode 135 170 205 135 170 205 135 170 205 kΩ
CMRR1 VCM = −8 V to +28 V
f = dc 82 82 82 dB
f = 1 kHz 82 82 82 dB
f = 10 kHz2 80 80 80 dB
PREAMPLIFIER
Gain 10 10 10 V/V
Gain Error −0.3 +0.3 −0.3 +0.3 −0.3 +0.3 %
Output Voltage Range 0.02 4.8 0.02 4.8 0.02 4.8 V
Output Resistance 97 100 103 97 100 103 97 100 103 kΩ
OUTPUT BUFFER
Gain Error 0.02 ≤ V
≤ 4.8 V dc −0.3 +0.3 −0.3 +0.3 −0.3 +0.3 %
Output Voltage Range 0.02 4.8 0.02 4.8 0.02 4.8 V
Input Bias Current 40 40 40 nA
Output Resistance 2 2 2 Ω
DYNAMIC RESPONSE
System Bandwidth VIN = 0.1 V p-p; V
Slew Rate VIN = 0.2 V dc; V
= 2.0 V p-p 30 50 30 50 30 50 kHz
= 4 V step 0.28 0.28 0.28 V/µs
NOISE
0.1 Hz to 10 Hz 10 10 10 µV p-p
Spectral Density, 1 kHz (RTI) 275 275 275 nV/√Hz
POWER SUPPLY
Operating Range 3.5 12 3.5 12 3.5 12 V
Quiescent Current vs.
VO = 0.1 V dc 0.25 1.0 0.25 1.0 0.25 1.0 mA
Temperature
PSRR VS = 3.5 V to 12 V 75 83 75 83 75 83 dB
TEMPERATURE RANGE
1
Source imbalance <2 Ω.
2
The AD8202 preamplifier exceeds 80 dB CMRR at 10 kHz. However, because the signal is available only by way of a 100 kΩ resistor, even the small amount of pin-to-
pin capacitance between Pin 1, Pin 8 and Pin 3, Pin 4 might couple an input common-mode signal larger than the greatly attenuated preamplifier output. The effect of
pin-to-pin coupling can be neglected in all applications by using filter capacitors at Node 3.
Rev. F | Page 3 of 20
AD8202 Data Sheet
Transient Input Voltage (400 ms)
44 V
SOIC
−40°C to +125°C
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage 12.5 V
Continuous Input Voltage (Common Mode) 35 V
Reversed Supply Voltage Protection 0.3 V
Operating Temperature Range
Die −40°C to +150°C
MSOP −40°C to +125°C
Storage Temperature −65°C to +150°C
Output Short-Circuit Duration Indefinite
Lead Temperature Range (Soldering, 10 sec) 300°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. F | Page 4 of 20
Data Sheet AD8202
–IN
1
GND
2
A1
3
A2
4
+IN
8
NC
7
+V
S
6
OUT
5
NC = NO CONNECT
AD8202
TOP VIEW
(Not to Scale)
04981-004
8
+IN
+205
+409
(CIRCUIT S IDE)
1.165
1.180
1
2
3
4
5
6
7
8
04981-100
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 3. Pin Function Descriptions
Pin No. Mnemonic X Y
1 −IN −205 +409
2 GND −413 +285
3 A1 −413 −229
4 A2 −309 −410
5 OUT +272 −410
6 +VS +417 −121
7 NC N/A1 N/A1
1
N/A = not applicable.
Figure 4. Pin Configuration
Figure 5. Metallization Photograph
Rev. F | Page 5 of 20
AD8202 Data Sheet
FREQUENCY (Hz)
PSRR (dB)
90
70
80
50
60
40
10
20
30
0
10 100 1k
10k 100k
04981-006
FREQUENCY (Hz)
OUTPUT (dB)
30
25
20
15
5
10
0
100 1k 10k 100k 1M
04981-007
FREQUENCY (Hz)
CMRR (dB)
100
95
90
85
75
80
70
10 100 1k 10k 100k
04981-008
POWER SUPPLY (V)
COMMON-MODE VOLTAGE (V)
0
–5
–10
–15
–20
–25
–30
–35
3 4 5 6 7 8 9 10 11 12 13
04981-009
–55°C
–40°C
+25°C
+125°C
+150
°C
POWER SUPPLY (V)
COMMON-MODE VOLTAGE (V)
40
35
25
30
20
5
10
15
0
3 654 87 109 11 1312
04981-010
–40°C
–55°C
+25°C
+125°C
+150°C
LOAD RESISTANCE (Ω)
OUTPUT SWING (V)
5.0
4.0
4.5
3.5
3.0
2.5
0.5
1.0
1.5
2.0
0
10 100 1k 10k
04981-011
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = 5 V, VCM = 0 V, RL = 10 kΩ, unless otherwise noted.
Figure 6. Power Supply Rejection Ratio vs.
Frequency Valid for CM Range −8 V to +28 V
Figure 7. Bandwidth
Figure 9. Negative Common-Mode Voltage vs. Voltage Supply
Figure 10. Positive Common-Mode Voltage vs. Voltage Supply
Figure 8. Common-Mode Rejection Ratio vs. Frequency
Valid for Common-Mode Range −8 V to +28 V
Figure 11. Output Swing vs. Load Resistance
Rev. F | Page 6 of 20
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