Low Cost, Single-Supply
Differential Amplifier
AD626
FEATURES
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
Pin Selectable Gains of 10 and 100
True Single-Supply Operation
Single-Supply Range of +2.4V to +10V
Dual-Supply Range of ؎1.2 V to ؎6V
Wide OutputVoltage Range of 30 mV to 4.7V
Optional Low-Pass Filtering
200k⍀
200k⍀
+IN
1
2
3
4
–IN
8
7
6
5
1/6
ANALOG
GND
Excellent DC Performance
G = 100
G = 30
Low Input OffsetVoltage: 500 V Max
Large Common-Mode Range: 0V to +54V
Low Power: 1.2 mW (VS = +5V)
Good CMR of 90 dBTyp
+V
S
–V
S
100k⍀
=
FILTER
G
2
OUT
AC Performance
AD626
Fast SettlingTime: 24 s (0.01%)
Includes Input Protection
Series Resistive Inputs (RIN = 200 k⍀)
RFI Filters Included
Allows 50V Continuous Overload
range of this amplifier is equal to 6 (+VS – 1V) which provides a
+24V CMR while operating from a +5V supply. Furthermore,
the AD626 features a CMR of 90 dB typ.
APPLICATIONS
Current Sensing
Interface for PressureTransducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
The amplifier’s inputs are protected against continuous overload of
up to 50V, and RFI filters are included in the attenuator network.
The output range is +0.03V to +4.9V using a +5V supply.The
amplifier provides a preset gain of 10, but gains between 10 and
100 can be easily configured with an external resistor. Further-
more, a gain of 100 is available by connecting the G = 100 pin to
analog ground.The AD626 also offers low-pass filter capability by
connecting a capacitor between the filter pin and analog ground.
PRODUCT DESCRIPTION
The AD626 is a low cost, true single-supply differential amplifier
designed for amplifying and low-pass filtering small differential
voltages from sources having a large common-mode voltage.
The AD626A and AD626B operate over the industrial temperature
range of –40°C to +85°C.The AD626 is available in two 8-lead
packages: a plastic mini-DIP and SOIC.
The AD626 can operate from either a single supply of +2.4V to
+10V, or dual supplies of 1.2V to 6V.The input common-mode
25
20
140
120
100
G = 10, 100
S
؎V
FOR SINGLE
CM
V
= +5V
15
10
5
80
60
40
20
0
AND DUAL SUPPLIES
G = 100
V
= ؎5V
S
G = 10
= ؎5V
V
S
؎V
FOR DUAL
CM
SUPPLIES ONLY
0
0.1
1
10
100
1k
10k
100k
1M
1
2
3
4
5
FREQUENCY – Hz
SUPPLY VOLTAGE – ؎V
Figure 2. Input Common-Mode Range vs. Supply
Figure 1. Common-Mode Rejection vs. Frequency
REV. D
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