AD626_03 Datasheet, PDF (1/12 Pages) Analog Devices – Low Cost, Single-Supply Differential Amplifi er

Low Cost, Single-Supply
Differential Amplifier
AD626
FEATURES
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 (V_S = +5 V)
Good CMR of 90 dB Typ
AC Performance
Fast Settling Time: 24 ␮s (0.01%)
Includes Input Protection
Series Resistive Inputs (R_IN = 200 k⍀)
RFI Filters Included
Allows 50 V Continuous Overload
APPLICATIONS
Current Sensing
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
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 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
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
–IN 1
ANALOG
GND
2
200k⍀
1/6
G = 30
200k⍀
8 +IN
7 G = 100
–V_S 3
FILTER 4
100k⍀
AD626
G=2
6 +VS
5 OUT
range of this amplifier is equal to 6 (+V_S – 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.
140
25
120
100
G = 10, 100
V_S = +5V
80
G = 100
60
V_S = ؎5V
40
G = 10
V_S = ؎5V
20
0
0.1
1
10
100
1k
10k 100k
1M
FREQUENCY – Hz
20
15
؎V_CM FOR SINGLE
AND DUAL SUPPLIES
10
5
؎V_CM FOR DUAL
SUPPLIES ONLY
0
1
2
3
4
5
SUPPLY VOLTAGE – ؎V
Figure 1. Common-Mode Rejection vs. Frequency
REV. D
Figure 2. Input Common-Mode Range vs. Supply
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