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AD22057

Single-Supply Sensor Interface Amplifier

Analog Devices 

a

FEATURES

Gain of ؋20. Alterable from ؋1 to ؋160

Input CMR from Below Ground to 6؋ (VS – 1 V)

Output Span 20 mV to (VS – 0.2) V

1-, 2-, 3-Pole Low-Pass Filtering Available

Accurate Midscale Offset Capability

Differential Input Resistance 400 k⍀

Drives 1 k⍀ Load to +4 V Using VS = +5 V

Supply Voltage: +3.0 V to +36 V

Transient Spike Protection and RFI Filters Included

Peak Input Voltage (40 ms): 60 V

Reversed Supply Protection: –34 V

Operating Temperature Range: –40؇C to +125؇C

APPLICATIONS

Current Sensing

Motor Control

Interface for Pressure Transducers, Position Indicators,

Strain Gages, and Other Low Level Signal Sources

Accelerometers

Single-Supply Sensor

Interface Amplifier

AD22057

FUNCTIONAL BLOCK DIAGRAM

+VS OFS A1 A2

AD22057

IN+

A1

IN–

A2

OUT

GND

GENERAL DESCRIPTION

The AD22057 is a single-supply difference amplifier for ampli-

fying and low-pass filtering small differential voltages (typically

100 mV FS at a gain of 40) from sources having a large common-

mode voltage.

Supply voltages from +3.0 V to +36 V can be used. The input

common-mode range extends from below ground to +24 V using

a +5 V supply with excellent rejection of this common-mode

voltage. This is achieved by the use of a special resistive attenua-

tor at the input, laser trimmed to a very high differential balance.

Provisions are included for optional low-pass filtering and gain

adjustment. An accurate midscale offset feature allows bipolar

signals to be amplified.

+VS (CAR BATTERY)

SOLENOID

LOAD

+5V

ANALOG OUTPUT

4V PER AMP

100m⍀

AD22057

200k⍀

CMOS DRIVER

CORNER FREQUENCY

= 0.796Hz-␮F

C

CHASSIS

POWER

DARLINGTON

SINGLE-POLE LOW-PASS FILTERING, GAIN: 40

ANALOG GROUND

Figure 1. Typical Application Circuit for a Current Sensor Interface

REV. B

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