AD22057N Analog Devices, AD22057N Datasheet

AD22057N

Manufacturer Part Number

AD22057N

Description

Single-Supply Sensor Interface Amplifier

Manufacturer

Analog Devices

Datasheet

1.AD22057N.pdf (8 pages)

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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

REV. A

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Gain of

Input CMR from Below Ground to 6

Output Span 20 mV to (V

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

Accurate Midscale Offset Capability

Differential Input Resistance 400 k

Drives 1 k

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,

Accelerometers

Strain Gages, and Other Low Level Signal Sources

20. Alterable from

Load to +4 V Using V

CMOS DRIVER

CHASSIS

(CAR BATTERY)

Figure 1. Typical Application Circuit for a Current Sensor Interface

– 0.2) V

1 to

= +5 V

160

– 1 V)

100m

SOLENOID

LOAD

POWER

DARLINGTON

SINGLE-POLE LOW-PASS FILTERING, GAIN: 40

AD22057

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.

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

Tel: 781/329-4700

Fax: 781/326-8703

IN+

IN–

FUNCTIONAL BLOCK DIAGRAM

AD22057

200k

World Wide Web Site: http://www.analog.com

CORNER FREQUENCY

Single-Supply Sensor

= 0.796Hz- F

Interface Amplifier

ANALOG GROUND

OFS

+5V

ANALOG OUTPUT

4V PER AMP

A1 A2

AD22057

OUT

GND

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AD22057N Summary of contents

Page 1

... CHASSIS Figure 1. Typical Application Circuit for a Current Sensor Interface REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

... C MAX –1 0.03 1 –12.5 +12.5 MAX 0.49 0.50 0.51 2.5 3 MAX 20 30 0.2 0.2 20.0 0. MAX = +5 V 200 500 –40 +125 AD22057N AD22057R resistor, which is trimmed to 3%. Package Options N-8 SO-8 SO-8* Units V V kHz V/V %/ REV. A ...

Page 3

ABSOLUTE MAXIMUM RATINGS* Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . +3 +36 V Peak Input Voltage (40 ms) . ...

Page 4

AD22057 Figure 3 shows a general method for trimming the gain, either upward or downward amount dependent on the resistor, R. The gain range, expressed as a percentage of the overall gain, is given by (10 M /R)%. ...

Page 5

OFS +V OUT CORNER FREQUENCY = S V AD22057 DM THAT IS, 1.59Hz- F –IN GND ...

Page 6

AD22057 To produce a full-scale output gain 40 is used, adjust- able absorb the tolerance in the sense resistor. There is sufficient headroom to allow at least a 10% overrange (to +4.4 V). ...

Page 7

APPLICATION HINTS Frequency Compensation As are all closed-loop op amp circuits, the AD22057 is sensitive to capacitive loading at its output. However, the AD22057 is sensitive at higher output voltages due to nonlinear effects in the rail-to-rail design of the ...

Page 8

AD22057 A unique method of feedback around A1, provided by R9 and R7, sets the closed-loop gain of the preamplifier to 10 (from the input pins). The feedback network is balanced by the inclu- sion of R6 and R8. The ...

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