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AD22057RZ

P1-P3P4-P6P7-P9
FUNCTIONAL BLOCK DIAGRAM
AD22057
OUT
GND
IN+
IN–
+V
S
OFS A1
A2
A1
A2
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.
a
Single-Supply Sensor
Interface Amplifier
AD22057
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
FEATURES
Gain of ⴛ20. Alterable from ⴛ1 to ⴛ160
Input CMR from Below Ground to 6ⴛ (V
S
– 1 V)
Output Span 20 mV to (V
S
– 0.2) V
1-, 2-, 3-Pole Low-Pass Filtering Available
Accurate Midscale Offset Capability
Differential Input Resistance 400 k⍀
Drives 1 k⍀ Load to +4 V Using V
S
= +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: –40ⴗC to +125ⴗC
APPLICATIONS
Current Sensing
Motor Control
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
Accelerometers
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.
AD22057
SINGLE-POLE LOW-PASS FILTERING, GAIN: 40
POWER
DARLINGTON
100mV
200kV
C
+5V
ANALOG OUTPUT
4V PER AMP
CORNER FREQUENCY
= 0.796Hz-mF
ANALOG GROUND
SOLENOID
LOAD
+V
S
(CAR BATTERY)
CMOS DRIVER
CHASSIS
Figure 1. Typical Application Circuit for a Current Sensor Interface
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
AD22057* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
DOCUMENTATION
Application Notes
• AN-669: Effectively Applying the AD628 Precision Gain
Block
Data Sheet
• AD22057: Single-Supply Sensor Interface Amplifier Data
Sheet
Technical Books
• A Designer's Guide to Instrumentation Amplifiers, 3rd
Edition, 2006
TOOLS AND SIMULATIONS
• AD22057 SPICE Macro-Model
REFERENCE MATERIALS
Technical Articles
• Auto-Zero Amplifiers
• Current Measurement in Solenoids for Automotive
Control Systems
• High-performance Adder Uses Instrumentation Amplifiers
DESIGN RESOURCES
• AD22057 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
View all AD22057 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
DOCUMENT FEEDBACK
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ORDERING GUIDE
Model Temperature Range Package Descriptions Package Options
AD22057N –40°C to +125°C Plastic DIP N-8
AD22057R –40°C to +125°C Plastic SOIC SO-8
AD22057R-Reel –40°C to +125°C Tape and Reel SO-8*
*Quantities must be in increments of 2,500 pieces each.
AD22057–SPECIFICATIONS
REV. A
–2–
(T
A
= +25ⴗC, V
S
= +5 V, V
CM
= 0, R
L
= 10 k⍀ unless otherwise noted)
Parameter Comments Test Conditions Min Typ Max Units
INPUTS (PINS 1 AND 8)
+CMR Positive Common-Mode Range T
A
= T
MIN
to T
MAX
+24 V
CMR Negative Common-Mode Range T
A
= T
MIN
to +85°C –1.0 V
CMRR
LF
Common-Mode Rejection Ratio f ≤ 10 Hz 80 90 dB
CMRR
HF
Common-Mode Rejection Ratio f = 1 kHz 80 90 dB
R
INCM
Common-Mode Input Resistance Pin 1 or Pin 8 to Pin 2 180 240 300 kΩ
R
MATCH
Matching of Resistances ±0.5 %
R
INDIFF
Differential Input Resistance Pin 1 to Pin 8 280 400 kΩ
PREAMPLIFIER
G
CL
Closed-Loop Gain
1
9.7 10.0 10.3 V/V
V
O
Output Voltage Range (Pin 3) +0.01 +4.8 V
R
O
Output Resistance
2
97 100 103 kΩ
OUTPUT BUFFER
G
CL
Closed-Loop Gain
1
R
LOAD
≥ 10 kΩ 1.94 2.0 2.06 V/V
V
O
Output Voltage Range
3
+0.02 +4.8 V
R
O
Output Resistance (Pin 5) V
O
≥ 0.1 V dc 2.0 Ω
OVERALL SYSTEM
G Gain
1
V
O
≥ 0.1 V dc 19.9 20.0 20.1 V/V
Gain Drift T
A
= T
MIN
to T
MAX
–62.5 +62.5 ppm/°C
V
OS
Input Offset Voltage
4
–1 0.03 1 mV
Offset Drift T
A
= T
MIN
to T
MAX
–12.5 +12.5 µV/°C
OFS Midscale Offset (Pin 7) Scaling 0.49 0.50 0.51 V/V
Input Resistance Pin 7 to Pin 2 2.5 3.0 kΩ
I
OSC
Short-Circuit Output Current 7 11 25 mA
T
A
= T
MIN
to T
MAX
527mA
BW
–3 dB
–3 dB Bandwidth V
O
= +1 V dc 20 30 kHz
SR Slew Rate 0.2 V/µs
N
SD
Noise Spectral Density
4
f = 100 Hz to 10 kHz 0.2 µV/√Hz
PSR Power Supply Rejection V
S
= 5 V, V
O
= 1 V to 4.2 V
V
S
= 24 V, V
O
= 1 V to 22 V
T
A
= T
MIN
to T
MAX
V
OS
Input Offset Voltage
4
20.0 µV/V
G Gain 0.05 %/V
POWER SUPPLY
V
S
Operating Range T
A
= T
MIN
to T
MAX
3536V
I
S
Quiescent Supply Range
5
T
A
= +25°C, V
S
= +5 V 200 500 µA
TEMPERATURE RANGE
T
OP
Operating Temperature Range –40 +125 °C
PACKAGE Plastic Mini-DIP (N-8) AD22057N
Plastic SOIC (SO-8) AD22057R
NOTES
1
Specified 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.
2
The actual output resistance of A1 is only a few ohms, but access to this output, via Pin 3, is always through a 100 kΩ resistor, which is trimmed to ±3%.
3
For V
CM
≤ 20 V. For V
CM
> 20 V, V
OL
⯝ 1 mV/V × V
CM
.
4
Referred to the input (Pins 1 and 8).
5
With V
DM
= 0 V. Differential mode signals are referred to as V
DM
, while V
CM
refers to common-mode voltages.
Specifications subject to change without notice.
P1-P3P4-P6P7-P9

AD22057RZ

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Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers IC INTERFACE AMP
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