AD22057R Analog Devices Inc, AD22057R Datasheet

IC AMP DIFF SNGL-SUP 8SOIC

AD22057R

Manufacturer Part Number
AD22057R
Description
IC AMP DIFF SNGL-SUP 8SOIC
Manufacturer
Analog Devices Inc
Type
Sensor Interfacer
Datasheet

Specifications of AD22057R

Rohs Status
RoHS non-compliant
Input Type
Voltage
Output Type
Analog
Interface
Differential
Current - Supply
200µA
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)

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a
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
+V
CMOS DRIVER
CHASSIS
S
(CAR BATTERY)
Figure 1. Typical Application Circuit for a Current Sensor Interface
S
– 0.2) V
1 to
S
= +5 V
160
(V
S
– 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
C
IN+
IN–
FUNCTIONAL BLOCK DIAGRAM
AD22057
200k
World Wide Web Site: http://www.analog.com
CORNER FREQUENCY
Single-Supply Sensor
A1
+V
= 0.796Hz- F
Interface Amplifier
S
ANALOG GROUND
OFS
+5V
ANALOG OUTPUT
4V PER AMP
A1 A2
© Analog Devices, Inc., 1999
AD22057
A2
OUT
GND

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AD22057R Summary of contents

Page 1

FEATURES Gain of 20. Alterable from 1 to Input CMR from Below Ground to 6 Output Span – 0. 1-, 2-, 3-Pole Low-Pass Filtering Available Accurate Midscale Offset Capability Differential Input Resistance 400 ...

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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