Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp, differential amplifier Differential MSOP 8

High Common-Mode Voltage,

Single-Supply Difference Amplifier

Data Sheet

AD8202

Rev. H Document Feedback

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support www.analog.com

FEATURES

High common-mode voltage range

−6 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

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 −6 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, respec-

tively. 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 that can be used for low-pass

filter applications and for establishing gains other than 20.

FUNCTIONAL BLOCK DIAGRAMS

+IN

–IN

200kΩ200kΩ

100kΩ

+IN

–IN

G = ×10 G = ×2

AD8202

10kΩ

+IN

–IN

GND

OUT

NC A1

NC = NO CONNECT

647

04981-001

Figure 1. SOIC (R) Package Die Form

GND

–IN

+IN

OUT

AD8202

OUTPUT

INDUCTIVE

LOAD

POWER

DEVICE

4-TERM

SHUNT

CLAMP

DIODE

BATTERY

14V

COMMON

NC = NO CONNECT

04981-002

Figure 2. High Line Current Sensor

GND

–

+IN

OUT

AD8202

OUTPUT

INDUCTIVE

LOAD

POWER

DEVICE

4-TERM

SHUNT

CLAMP

DIODE

BATTERY

14V

COMMON

NC = NO CONNECT

04981-003

Figure 3. Low Line Current Sensor

Summary of content (20 pages)

PAGE 1
High Common-Mode Voltage, Single-Supply Difference Amplifier AD8202 Data Sheet FEATURES FUNCTIONAL BLOCK DIAGRAMS NC A1 A2 +VS 7 3 4 6 AD8202 100kΩ G = ×10 G = ×2 +IN A1 –IN +IN 8 –IN 1 +IN A2 –IN 5 10kΩ 200kΩ 200kΩ 10kΩ 2 APPLICATIONS NC = NO CONNECT GND Figure 1.
PAGE 2
AD8202 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 12 Applications ....................................................................................... 1 Applications..................................................................................... 14 General Description ..............................................
PAGE 3
Data Sheet AD8202 SPECIFICATIONS SINGLE SUPPLY TOPR = operating temperature range, VS = 5 V, unless otherwise noted, RTI = referred to input, VCM = common-mode voltage. Table 1. Parameter SYSTEM GAIN Initial Error vs. Temperature Gain Drift VOLTAGE OFFSET Initial Input Offset (RTI), TOPR Offset vs.
PAGE 4
AD8202 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Transient Input Voltage (400 ms) Continuous Input Voltage (Common Mode) Reversed Supply Voltage Protection Operating Temperature Range Die SOIC MSOP Storage Temperature Output Short-Circuit Duration Lead Temperature Range (Soldering, 10 sec) Rating 12.5 V 44 V 35 V 0.
PAGE 5
Data Sheet AD8202 –IN 1 GND 2 AD8202 8 +IN 7 NC 6 +VS A1 3 TOP VIEW A2 4 (Not to Scale) 5 OUT NC = NO CONNECT 04981-004 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 4. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 Mnemonic −IN GND A1 A2 OUT +VS NC +IN 1.180 X −205 −413 −413 −309 +272 +417 N/A1 +205 Y +409 +285 −229 −410 −410 −121 N/A1 +409 1 8 2 7 1.165 6 3 N/A = not applicable. 4 5 (CIRCUIT SIDE) Figure 5. Metallization Photograph Rev.
PAGE 6
AD8202 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VS = 5 V, VCM = 0 V, RL = 10 kΩ, unless otherwise noted. 90 0 80 PSRR (dB) 60 50 40 30 20 0 10 100 1k FREQUENCY (Hz) 10k –40°C –15 +25°C –20 –25 +125°C –30 04981-006 10 –55°C –10 +150°C 04981-009 COMMON-MODE VOLTAGE (V) –5 70 –35 100k 3 Figure 6. Power Supply Rejection Ratio vs. Frequency Valid for CM Range −8 V to +28 V 4 5 6 7 8 9 10 POWER SUPPLY (V) 11 12 13 Figure 9. Negative Common-Mode Voltage vs.
PAGE 7
Data Sheet AD8202 18 0 TEMPERATURE = 25°C 16 OUTPUT MINUS SUPPLY (mV) –10 14 NO LOAD –20 12 HITS –30 –40 10k LOAD 10 8 6 –50 04981-012 3 4 6 5 7 8 9 10 SUPPLY VOLTAGE (V) 11 12 2 0 13 –70 –65 –60 –55 –50 –45 –40 –35 –30 –25 –20 –15 –10 –5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 –70 04981-043 4 –60 CMRR (µV/V) Figure 12. Output Minus Supply vs. Supply Voltage Figure 15.
PAGE 8
AD8202 Data Sheet 9 10 TEMPERATURE = –40°C VSUPPLY = 5V TEMPERATURE RANGE = 25°C TO 85°C 9 8 8 7 7 6 HITS HITS 6 5 5 4 4 3 3 04981-052 0 VOS DRIFT (µV/°C) –2200 –2000 –1800 –1600 –1400 –1200 –1000 –800 –600 –400 –200 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 1 16.0 14.0 12.0 8.0 10.0 6.0 4.0 0 2.0 –2.0 –4.0 –6.0 –8.0 –10.0 –12.0 –14.0 0 –16.0 1 04981-039 2 2 VOS (µV) Figure 18.
PAGE 9
Data Sheet AD8202 14 10 VSUPPLY = 5V TEMPERATURE RANGE = 25°C TO 125°C TEMPERATURE = –40°C 9 12 8 7 6 8 HITS HITS 10 6 5 4 3 4 04981-042 18 16 14 12 8 10 6 4 2 0 –2 –4 –6 –8 –10 –12 –14 –16 0 –18 1 –0.15 –0.13 –0.11 –0.09 –0.07 –0.05 –0.03 –0.01 0.01 0.03 0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29 0 04981-050 2 2 GAIN DRIFT (PPM/°C) ERROR (%) Figure 24. MSOP Gain Accuracy, Temperature = −40°C Figure 27.
PAGE 10
AD8202 Data Sheet 30 35 TEMPERATURE = –40°C 30 25 VSUPPLY = 5V TEMPERATURE RANGE = 25°C TO 125°C 25 HITS HITS 20 20 15 15 10 10 –10.0 –9.0 –8.0 –7.0 –6.0 –5.0 –4.0 –3.0 –2.0 –1.0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 04981-029 0 –1500 –1400 –1300 –1200 –1100 –1000 –900 –800 –700 –600 –500 –400 –300 –200 –100 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 0 04981-027 5 5 VOS DRIFT (µV/°C) VOS (µV) Figure 30.
PAGE 11
Data Sheet AD8202 50 25 TEMPERATURE = –40°C VSUPPLY = 5V TEMPERATURE RANGE = 25°C TO 85°C 45 20 40 35 15 HITS HITS 30 25 10 20 15 0 ERROR (%) GAIN DRIFT (PPM/°C) Figure 36. Gain Accuracy, SOIC, Temperature = −40°C Figure 38. Gain Drift Distribution, SOIC, Temperature Range = 25°C to 85°C 40 35 –25 –23 –21 –19 –17 –15 –13 –11 –9 –7 –5 –3 –1 1 3 5 7 9 11 13 15 17 19 21 23 25 04981-033 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.
PAGE 12
AD8202 Data Sheet THEORY OF OPERATION The AD8202 consists of a preamp and buffer arranged as shown in Figure 40. Like-named resistors have equal values. The preamp uses a dynamic bridge (subtractor) circuit. Identical networks (within the shaded areas), consisting of RA, RB, RC, and RG, attenuate input signals applied to Pin 1 and Pin 8.
PAGE 13
Data Sheet AD8202 –140 VSUPPLY = 5V TEMPERATURE RANGE = +125°C TO –40°C A2 INPUT BIAS CURRENT (nA) –120 • The total error at the input of A2, 24 mV, multiplied by the buffer gain generates a resulting error of 48 mV at the output of the buffer. This is AD8202 system output low saturation potential. • The high output voltage range of the AD8202 is specified as 4.8 V. Therefore, assuming a typical A2 input bias current, the output voltage range for the AD8202 is 48 mV to 4.8 V.
PAGE 14
AD8202 Data Sheet APPLICATIONS The AD8202 difference amplifier is intended for applications that require extracting a small differential signal in the presence of large common-mode voltages. The differential input resistance is nominally 325 kΩ, and the device can tolerate common-mode voltages higher than the supply voltage and lower than ground. The open collector output stage sources current to within 20 mV of ground and to within 200 mV of VS.
PAGE 15
Data Sheet AD8202 GAIN TRIM Figure 45 shows a method for incremental gain trimming by using a trim potentiometer and external resistor, REXT. The following approximation is useful for small gain ranges: ΔG ≈ (10 MΩ/REXT)% Thus, the adjustment range is ±2% for REXT = 5 MΩ; ±10% for REXT = 1 MΩ, and so on. Low-pass filters can be implemented in several ways by using the AD8202.
PAGE 16
AD8202 Data Sheet by a 1-pole low-pass filter, set with a corner frequency of 3.6 Hz, providing about 30 dB of attenuation at 100 Hz. A higher rate of attenuation can be obtained using a 2-pole filter with fC = 20 Hz, as shown in Figure 50. Although this circuit uses two separate capacitors, the total capacitance is less than half that needed for the 1-pole filter.
PAGE 17
Data Sheet AD8202 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 8 0.50 (0.0196) 0.25 (0.0099) 3.20 3.00 2.80 1 45° 5 5.15 4.90 4.65 4 PIN 1 IDENTIFIER 8° 0° 0.65 BSC 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 18
AD8202 Data Sheet NOTES Rev.
PAGE 19
Data Sheet AD8202 NOTES Rev.