AD623_16 Datasheet, PDF (1/27 Pages) Analog Devices – Single and Dual-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier

Data Sheet
Single and Dual-Supply, Rail-to-Rail,
Low Cost Instrumentation Amplifier
AD623
FEATURES
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)
APPLICATIONS
Low power medical instrumentation
Transducer interfaces
Thermocouple amplifiers
Industrial process controls
Difference amplifiers
Low power data acquisition
GENERAL DESCRIPTION
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 common-
mode voltages as low as 150 mV below ground. The AD623
maintains superior performance with dual and single polarity
power supplies.
Table 1. Low Power Upgrades for the AD623
Part No.
Total VS (V dc)
Typical IQ (μA)
AD8235
5.5
30
AD8236
5.5
33
AD8237
5.5
33
AD8226
36
350
AD8227
36
325
AD8420
36
85
AD8422
36
300
AD8426
36
325 (per channel)
2
–IN
V_DIFF ^–
2₊
V_CM
V_DIFF ^–
2₊
+IN
3
FUNCTIONAL BLOCK DIAGRAM
+V_S
7
50kΩ 50kΩ
A1
–R_G 50kΩ
R_G
1
8
50kΩ
A3
+R_G
4
–V_S
50kΩ 50kΩ
A2
Figure 1.
6
OUTPUT
5
REF
Rev. E
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