Single-Supply Differential Amplifier
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Low Cost, Single-Supply
Pin Selectable Gains of 10 and 100
True Single-Supply Operation
Single-Supply Range of +2.4 V to +10 V
Dual-Supply Range of ؎1.2 V to ؎6 V
Wide Output Voltage Range of 30 mV to 4.7 V
Optional Low-Pass Filtering
Excellent DC Performance
Low Input Offset Voltage: 500 V Max
Large Common-Mode Range: 0 V to +54 V
Low Power: 1.2 mW (VS = +5 V)
Good CMR of 90 dB Typ
Fast Settling Time: 24 s (0.01%)
Includes Input Protection
Series Resistive Inputs (RIN = 200 k⍀)
RFI Filters Included
Allows 50 V Continuous Overload
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
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 AD626 can operate from either a single supply of +2.4 V to
+10 V, or dual supplies of ±1.2 V to ±6 V.The input common-mode
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
G = 30
7 G = 100
range of this ampliﬁer is equal to 6 (+VS – 1 V) which provides a
+24 V CMR while operating from a +5 V supply. Furthermore,
the AD626 features a CMR of 90 dB typ.
The ampliﬁer’s inputs are protected against continuous overload of
up to 50 V, and RFI ﬁlters are included in the attenuator network.
The output range is +0.03 V to +4.9 V using a +5 V 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.
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.
G = 10, 100
VS = +5V
G = 100
60 VS = ؎5V
G = 10
VS = ؎5V
0.1 1 10 100 1k 10k 100k 1M
FREQUENCY – Hz
15 ؎VCM FOR SINGLE
AND DUAL SUPPLIES
5 ؎VCM FOR DUAL
SUPPLY VOLTAGE – ؎V
Figure 1. Common-Mode Rejection vs. Frequency
Figure 2. Input Common-Mode Range vs. Supply
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