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Analog Devices Semiconductor Electronic Components Datasheet

AD22057 Datasheet

Single-Supply Sensor Interface Amplifier

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AD22057 pdf
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 kLoad 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. 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD22057 Datasheet

Single-Supply Sensor Interface Amplifier

No Preview Available !

AD22057 pdf
AD22057–SPECIFICATIONS (TA = +25؇C, VS = +5 V, VCM = 0, RL = 10 kunless otherwise noted)
Parameter
Comments
Test Conditions
Min Typ Max Units
INPUTS (PINS 1 AND 8)
+CMR
CMR
CMRRLF
CMRRHF
RINCM
RMATCH
RINDIFF
Positive Common-Mode Range TA = TMIN to TMAX
Negative Common-Mode Range TA = TMIN to +85°C
Common-Mode Rejection Ratio f 10 Hz
Common-Mode Rejection Ratio f = 1 kHz
Common-Mode Input Resistance Pin 1 or Pin 8 to Pin 2
Matching of Resistances
Differential Input Resistance
Pin 1 to Pin 8
+24 V
–1.0 V
80 90
dB
80 90
dB
180 240 300 k
± 0.5 %
280 400
k
PREAMPLIFIER
GCL
VO
RO
OUTPUT BUFFER
GCL
VO
RO
OVERALL SYSTEM
G
VOS
OFS
IOSC
BW–3 dB
SR
NSD
PSR
VOS
G
Closed-Loop Gain1
Output Voltage Range (Pin 3)
Output Resistance2
9.7
+0.01
97
10.0
100
10.3 V/V
+4.8 V
103 k
Closed-Loop Gain1
Output Voltage Range3
Output Resistance (Pin 5)
RLOAD 10 k
VO 0.1 V dc
1.94
+0.02
2.0
2.0
2.06 V/V
+4.8 V
Gain1
Gain Drift
Input Offset Voltage4
VO 0.1 V dc
TA = TMIN to TMAX
19.9 20.0 20.1 V/V
–62.5
+62.5 ppm/°C
–1 0.03 1 mV
Offset Drift
TA = TMIN to TMAX
Midscale Offset (Pin 7) Scaling
–12.5
+12.5 µV/°C
0.49 0.50 0.51 V/V
Input Resistance
Pin 7 to Pin 2
2.5 3.0
k
Short-Circuit Output Current
7 11 25 mA
–3 dB Bandwidth
Slew Rate
Noise Spectral Density4
TA = TMIN to TMAX
VO = +1 V dc
f = 100 Hz to 10 kHz
5 27 mA
20 30
kHz
0.2 V/µs
0.2 µV/Hz
Power Supply Rejection
Input Offset Voltage4
VS = 5 V, VO = 1 V to 4.2 V
VS = 24 V, VO = 1 V to 22 V
TA = TMIN to TMAX
20.0 µV/V
Gain
0.05 %/V
POWER SUPPLY
VS
IS
Operating Range
Quiescent Supply Range5
TA = TMIN to TMAX
TA = +25°C, VS = +5 V
3
5 36 V
200 500 µA
TEMPERATURE RANGE
TOP
PACKAGE
Operating Temperature Range
Plastic Mini-DIP (N-8)
Plastic SOIC (SO-8)
–40 +125 °C
AD22057N
AD22057R
NOTES
1Specified for default mode i.e., with no external components. The overall gain is trimmed to ± 0.5% while the individual gains of A1 and A2 may be subject to a
maximum ± 3% tolerance. Note that the actual gain in a particular application can be modified by the use of external resistor networks.
2The actual output resistance of A1 is only a few ohms, but access to this output, via Pin 3, is always through a 100 k resistor, which is trimmed to ± 3%.
3For VCM 20 V. For VCM > 20 V, VOL Ӎ 1 mV/V × VCM.
4Referred to the input (Pins 1 and 8).
5With VDM = 0 V. Differential mode signals are referred to as VDM, while VCM refers to common-mode voltages.
Specifications subject to change without notice.
ORDERING GUIDE
Model
Temperature Range Package Descriptions
AD22057N
AD22057R
AD22057R-Reel
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Plastic DIP
Plastic SOIC
Tape and Reel
*Quantities must be in increments of 2,500 pieces each.
Package Options
N-8
SO-8
SO-8*
–2– REV. A


Part Number AD22057
Description Single-Supply Sensor Interface Amplifier
Maker Analog Devices
Total Page 8 Pages
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