Low Cost, Single-Supply
Differential Ampli鏗乪r
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
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N)
and SOIC (R) Packages
200k
鈥揑N
ANALOG
GND
鈥揤
S
1
1/6
2
G = 30
7
G = 100
200k
8
+IN
3
100k
6
+V
S
FILTER
4
G=2
5
OUT
AD626
range of this ampli鏗乪r is equal to 6 (+V
S
鈥?1 V) which provides a
+24 V CMR while operating from a +5 V supply. Fur thermore,
the AD626 features a CMR of 90 dB typ.
The ampli鏗乪r鈥檚 inputs are protected against continuous overload of
up to 50 V, and RFI 鏗乴ters are included in the attenuator network.
The output range is +0.03 V to +4.9 V using a +5 V supply. The
ampli鏗乪r provides a preset gain of 10, but gains between 10 and
100 can be easily con鏗乬ured 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 鏗乴ter capability by
connecting a capacitor between the 鏗乴ter pin and analog ground.
The AD626A and AD626B operate over the industrial temperature
range of 鈥?0擄C to +85擄C. The AD626 is available in two 8-lead
packages: a plastic mini-DIP and SOIC.
25
The AD626 is a low cost, true single-supply differential ampli鏗乪r
designed for amplifying and low-pass 鏗乴tering 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 鹵1.2 V to 鹵6 V. The input common-mode
140
INPUT COMMON-MODE RANGE 鈥?V
COMMON-MODE REJECTION 鈥?dB
120
20
100
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
1
10
100
1k
FREQUENCY 鈥?Hz
10k
100k
1M
0
1
2
3
SUPPLY VOLTAGE 鈥?/div>
4
V
5
Figure 1. Common-Mode Rejection vs. Frequency
Figure 2. Input Common-Mode Range vs. Supply
REV. D
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
that may result from its use. No license is granted by implication or other-
wise under any patent or patent rights of Analog Devices.Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P Box 9106, Norwood, MA 02062-9106, U.S.A.
.O.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
漏 2003 Analog Devices, Inc. All rights reserved.
1
2
3
4
5
6
7
8
9
10
11
12
