a
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
Low Cost, Single Supply
Differential Amplifier
AD626
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (SO) Packages
200k
–IN
ANALOG
GND
–V
S
1
1/6
2
G = 30
200k
8
+IN
7
G = 100
3
100k
6
+V
S
FILTER
4
G=2
5
OUT
AD626
The AD626 is a low cost, true single supply differential ampli-
fier designed for amplifying and low-pass filtering small differen-
tial 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 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.
160
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 be-
tween 10 to 100 can be easily configured with an external resis-
tor. Furthermore, 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 tempera-
ture range of –40°C to +85°C. The AD626 is available in two
8-lead packages: a plastic mini-DIP and SOIC.
25
INPUT COMMON MODE RANGE – Volts
140
20
100
CMRR – dB
80
60
40
20
0
0.1
G = 10,100
V
S
= +5V
G = 100
V
S
= 5V
15
V
CM
FOR SINGLE
AND DUAL SUPPLIES
10
G = 10
V
S
= 5V
5
V
CM
FOR DUAL
SUPPLIES ONLY
0
1
10
100
1k
FREQUENCY – Hz
10k
100k
1M
1
2
3
4
Volts
5
POWER SUPPLY VOLTAGE –
Common-Mode Rejection vs. Frequency
Input Common-Mode Range vs. Supply
REV. C
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
AD [ ANALOG DEVICES ]
