Datasheet AD22057 (Analog Devices)

a
Single-Supply Sensor Interface Amplifier AD22057 FEATURES FUNCTIONAL BLOCK DIAGRAM Gain of
ⴛ
20. Alterable from
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1 to
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160 Input CMR from Below Ground to 6
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(VS – 1 V) +VS OFS A1 A2 Output Span 20 mV to (VS – 0.2) V 1-, 2-, 3-Pole Low-Pass Filtering Available AD22057 Accurate Midscale Offset Capability Differential Input Resistance 400 k
⍀
IN+ A1 A2 Drives 1 k OUT
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Load to +4 V Using VS = +5 V IN– 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 GND Operating Temperature Range: –40
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C to +125
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C APPLICATIONS Current Sensing Motor Control Interface for Pressure Transducers, Position Indicators, Strain Gages, and Other Low Level Signal Sources Accelerometers GENERAL DESCRIPTION
a +5 V supply with excellent rejection of this common-mode The AD22057 is a single-supply difference amplifier for ampli- voltage. This is achieved by the use of a special resistive attenua- fying and low-pass filtering small differential voltages (typically tor at the input, laser trimmed to a very high differential balance. 100 mV FS at a gain of 40) from sources having a large common- Provisions are included for optional low-pass filtering and gain mode voltage. adjustment. An accurate midscale offset feature allows bipolar Supply voltages from +3.0 V to +36 V can be used. The input signals to be amplified. common-mode range extends from below ground to +24 V using
+VS (CAR BATTERY) +5V SOLENOID LOAD ANALOG OUTPUT 4V PER AMP 100m
V
AD22057 200k
V
CORNER FREQUENCY CMOS DRIVER = 0.796Hz-
m
F C POWER ANALOG GROUND DARLINGTON CHASSIS SINGLE-POLE LOW-PASS FILTERING, GAIN: 40
Figure 1. Typical Application Circuit for a Current Sensor Interface REV. B
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