AD623 Datasheet, PDF (1/16 Pages) Analog Devices – Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier

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Single Supply, Rail-to-Rail, Low Cost
Instrumentation Amplifier
FEATURES
Easy to Use
Higher Performance than Discrete Design
Single and Dual Supply Operation
Rail-to-Rail Output Swing
Input Voltage Range Extends 150 mV Below Ground
(Single Supply)
Low Power, 575 ␮A Max Supply Current
Gain Set with One External Resistor
Gain Range 1 (No Resistor) to 1,000
HIGH ACCURACY DC PERFORMANCE
0.1% Gain Accuracy (G = 1)
0.35% Gain Accuracy (G > 1)
25 ppm Gain Drift (G = 1)
200 ␮V Max Input Offset Voltage (AD623A)
2 ␮V/؇C Max Input Offset Drift (AD623A)
100 ␮V Max Input Offset Voltage (AD623B)
1 ␮V/؇C Max Input Offset Drift (AD623B)
25 nA Max Input Bias Current
NOISE
35 nV/√Hz RTI Noise @ 1 kHz (G = 1)
EXCELLENT AC SPECIFICATIONS
90 dB Min CMRR (G = 10); 84 dB Min CMRR (G = 5)
(@ 60 Hz, 1K Source Imbalance)
800 kHz Bandwidth (G = 1)
20 ␮s Settling Time to 0.01% (G = 10)
APPLICATIONS
Low Power Medical Instrumentation
Transducer Interface
Thermocouple Amplifier
Industrial Process Controls
Difference Amplifier
Low Power Data Acquisition
PRODUCT DESCRIPTION
The AD623 is an integrated single supply instrumentation am-
plifier that delivers rail-to-rail output swing on a single supply
(+3 V to +12 V supplies). The AD623 offers superior user flex-
ibility by allowing single gain set resistor programming, and
conforming to the 8-lead industry standard pinout configura-
tion. 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 up to 1,000.
The AD623 holds errors to a minimum by providing superior
AC CMRR that increases with increasing gain. Line noise, as
well as line harmonics, will be rejected since the CMRR re-
mains constant up to 200 Hz. The AD623 has a wide input
AD623
CONNECTION DIAGRAM
8-Lead Plastic DIP (N),
SOIC (R) and ␮SOIC (RM) Packages
؊R_G 1
؊IN ²
؉IN 3
؊V_S 4
AD623
8 ؉R_G
7 ؉V_S
6 OUTPUT
5 _REF
common-mode range and can amplify signals that have a
common-mode voltage 150 mV below ground. Although the
design of the AD623 has been optimized to operate from a single
supply, the AD623 still provides superior performance when
operated from a dual voltage supply (± 2.5 V to ± 6.0 V).
Low power consumption (1.5 mW at 3 V), wide supply voltage
range, and rail-to-rail output swing make the AD623 ideal for
battery powered applications. The rail-to-rail output stage maxi-
mizes the dynamic range when operating from low supply volt-
ages. The AD623 replaces discrete instrumentation amplifier
designs and offers superior linearity, temperature stability and
reliability in a minimum of space. Until the AD623, this level of
instrumentation amplifier performance has not been achieved.
120
110
100
x1000
90
x100
80
70
x10
60
50
x1
40
30
1
10
100
1k
10k
100k
FREQUENCY – Hz
Figure 1. CMR vs. Frequency, +5 V_S, 0 V_S
REV. C
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© Analog Devices, Inc., 1999