AD22057 Analog Devices, AD22057 Datasheet

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AD22057

Manufacturer Part Number
AD22057
Description
Single Supply Sensor Interface Amplifier
Manufacturer
Analog Devices
Datasheet

Specifications of AD22057

Filter Option
Yes
Common Mode Input (v)min
--1V
Common Mode Input (v)max
+24V
Bandwidth G=10 (khz Typ)
30kHz
Cmrr (db)
80dB
Vcc-vee
3V to 26V

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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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AD22057 Summary of contents

Page 1

... Interface for Pressure Transducers, Position Indicators, Strain Gages, and Other Low Level Signal Sources Accelerometers GENERAL DESCRIPTION The AD22057 is a single-supply difference amplifier for ampli- fying and low-pass filtering small differential voltages (typically 100 gain of 40) from sources having a large common- mode voltage. ...

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

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD22057 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... V – 0.2 V) with large differential input voltages. The input of S the AD22057 is limited to no greater than (V – 0.2)/10, for overall gains less than 10, since the preamplifier, with its fixed gain of 10, reaches its full scale output before the output buffer. For this is 0 ...

Page 5

... If the maximum battery voltage spikes up to +20 V, the common- mode voltage at the input can be as high as 21.5 V. This can measured using even supply for the AD22057 –5– AD22057 has the same 3 has at a frequency 1 ...

Page 6

... The relationship is described by: ANALOG COMMON *This 20 k resistor is internal to the AD22057 and can vary by 30%. where R L cannot be made arbitrarily small since this would require exces- sive current from the output. The output current should be limited total. – ...

Page 7

... R Since the perturbations from the analog-to-digital converter are small, the output of the AD22057 will appear low impedance. The transient response will, therefore, have a time constant governed by the product of the two lag compo- ...

Page 8

... Pin 3 to ground. By sepa- rating the connections at Pins 3 and 4, a two-pole Sallen and R1 200k IN+ IN– R2 200k R11 2k R10 2k Figure 16. Simplified Schematic of AD22057, Including Component Values Plastic Mini-DIP Package (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN 1 ...

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