Single and Dual-Supply, Rail-to-Rail,
Low Cost Instrumentation Amplifier
AD623
Data Sheet
FEATURES
GENERAL DESCRIPTION
Easy to use
Rail-to-rail output swing
Input voltage range extends 150 mV below ground
(single supply)
Low power, 550 μA maximum supply current
Gain set with one external resistor
Gain range: 1 to 1000
High accuracy dc performance
0.10% gain accuracy (G = 1)
0.35% gain accuracy (G > 1)
Noise: 35 nV/√Hz RTI noise at 1 kHz
Excellent dynamic specifications
800 kHz bandwidth (G = 1)
20 μs settling time to 0.01% (G = 10)
The AD623 is an integrated, single- or dual-supply instrumentation
amplifier that delivers rail-to-rail output swing using supply
voltages from 3 V to 12 V. The AD623 offers superior user
flexibility by allowing single gain set resistor programming and by
conforming to the 8-lead industry standard pinout configuration.
With no external resistor, the AD623 is configured for unity
gain (G = 1), and with an external resistor, the AD623 can be
programmed for gains of up to 1000.
The superior accuracy of the AD623 is the result of increasing
ac common-mode rejection ratio (CMRR) coincident with
increasing gain; line noise harmonics are rejected due to
constant CMRR up to 200 Hz. The AD623 has a wide input
common-mode range and amplifies signals with commonmode voltages as low as 150 mV below ground. The AD623
maintains superior performance with dual and single polarity
power supplies.
APPLICATIONS
Low power medical instrumentation
Transducer interfaces
Thermocouple amplifiers
Industrial process controls
Difference amplifiers
Low power data acquisition
Table 1. Low Power Upgrades for the AD623
Part No.
AD8235
AD8236
AD8237
AD8226
AD8227
AD8420
AD8422
AD8426
Total VS (V dc)
5.5
5.5
5.5
36
36
36
36
36
Typical IQ (μA)
30
33
33
350
325
85
300
325 (per channel)
FUNCTIONAL BLOCK DIAGRAM
A1
–
VDIFF
2 +
VCM
–RG
–
RG
VDIFF
2 +
+IN
3
50kΩ
50kΩ
1
8
50kΩ
50kΩ
A3
6
OUTPUT
+RG
A2
4
–VS
50kΩ
50kΩ
5
REF
00778-054
–IN
+VS
7
2
Figure 1.
Rev. E
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