Analog Devices AD8202 c Datasheet

High Common-Mode Voltage,

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 typ gain drift 80 dB CMRR min dc to 10 kHz

PLATFORMS

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. The input CMV range extends from

−8 V to +28 V at a typical supply voltage of 5 V.

Single-Supply Difference Amplifier

AD8202

FUNCTIONAL BLOCK DIAGRAM

INDUCTIVE LOAD

+IN

–IN

647

G = ×2

+IN

–IN

AD8202

GND

AD8202

OUT

10kΩ

GND

OUT

04981-001

OUTPUT

+IN

–IN

BATTERY

NC A1

200kΩ200kΩ

NC = NO CONNECT

Figure 1. SOIC (R) Package Die Form

CLAMP

DIODE

14V

G = ×10

+IN

–IN

4-TERM

SHUNT

POWER DEVICE

100kΩ

The AD8202 is offered in die and packaged form. Both package options are specified over a wide temperature range of −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, which keeps 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.

The AD8202 features an externally accessible 100 kΩ resistor at the output of the preamp A1, which can be used for low-pass filter applications and for establishing gains other than 20.

Rev. C

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 registered trademarks are the property of their respective owners.

COMMON

NC = NO CONNECT

Figure 2. High-Line Current Sensor

POWER DEVICE

BATTERY

14V

CLAMP

DIODE

COMMON NC = NO CONNECT

4-TERM

SHUNT

INDUCTIVE LOAD

Figure 3. Low-Line Current Sensor

www.analog.com

+IN

–IN

AD8202

GND

OUT

04981-002

OUTPUT

04981-003

AD8202

TABLE OF CONTENTS

Specifications—Single Supply......................................................... 3

Gain Trim .................................................................................... 14

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

Theory of Operation ...................................................................... 12

Applications..................................................................................... 13

Current Sensing .......................................................................... 13

Gain Adjustment ........................................................................ 13

REVISION HISTORY

2/05—Rev. B to Rev. C

Changes to Table 1............................................................................ 3

Changes to Figure 14........................................................................ 8

Changes to Figure 22........................................................................ 9

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

Low-Pass Filtering ...................................................................... 14

High-Line Current Sensing with LPF and Gain Adjustment

Driving Charge Redistribution ADCs..................................... 15

Outline Dimensions ....................................................................... 16

Ordering Guide .......................................................................... 16

................................................................. 15

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. C | Page 2 of 16

AD8202

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

Initial 20 20 20 V/V Error

0.02 ≤ V

OUT

≤

4.8 V dc @ 25°C

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 CMV Continuous −8 +28 −8 +28 −8 +28 V Common-Mode Rejection

VCM = −8 V to +28 V f = dc 82 82 82 dB f = 1 kHz 82 82 82 dB f = 10 kHz

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 2 2 2 V/V Gain Error 0.02 ≤ V

≤ 4.8 V dc −0.3 +0.3 −0.3 +0.3 −0.3 +0.3 %

OUT

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

Slew Rate

= 0.1 V p-p;

= 2.0 V p-p

OUT

= 0.2 V dc;

= 4 V step

OUT

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

= 0.1 V dc 0.25 1.0 0.25 1.0 0.25 1.0 mA

Quiescent Current vs.

Temperature

PSRR VS = 3.5 V to 12 V 75 83 75 83 75 83 dB

TEMPERATURE RANGE

For Specified Performance −40 +125 −40 +125 −40 +150 °C

See notes on next page.

−0.3 +0.3 −0.3 +0.3 %

80 80 80 dB

30 50 30 50 30 50 kHz

0.28 0.28 0.28 V/µs

Rev. C | Page 3 of 16

AD8202

Source imbalance < 2 Ω.

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 Pins 1, 8 and 3, 4 might couple an input common-mode signal larger than the greatly attenuated preamplifier output. The effect of pin-topin coupling can be neglected in all applications by using filter capacitors at Node 3.

Rev. C | Page 4 of 16

AD8202

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 12.5 V Transient Input Voltage (400 ms) 44 V Continuous Input Voltage (Common Mode) 35 V Reversed Supply Voltage Protection 0.3 V Operating Temperature Range

Die −40°C to +150°C SOIC −40°C to +125°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

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

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.

Rev. C | Page 5 of 16

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