Datasheet AD623 (Analog Devices)

Single-Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier AD623 FEATURES CONNECTION DIAGRAM Easy to use AD623 –R 1 Higher performance than discrete design G 8 +RG –IN 2 7 +VS Single-supply and dual-supply operation +IN 3 6 OUTPUT Rail-to-rail output swing –V 4 S 5 REF Input voltage range extends 150 mV below
1
TOP VIEW
-00
ground (single supply)
78
(Not to Scale)
07 0
Low power, 550 μA maximum supply current
Figure 1. 8-Lead PDIP (N), SOIC (R), and MSOP (RM) Packages
Gain set with one external resistor Gain range: 1 (no resistor) to 1000 120 High accuracy dc performance 0.10% gain accuracy (G = 1) 110 0.35% gain accuracy (G > 1) 100 ×1000 10 ppm maximum gain drift (G = 1) 90 200 μV maximum input offset voltage (AD623A) ×100 2 μV/°C maximum input offset drift (AD623A) B) 80 d ( 100 μV maximum input offset voltage (AD623B) R 70 CM 1 μV/°C maximum input offset drift (AD623B) ×10 60 25 nA maximum input bias current Noise: 35 nV/√Hz RTI noise @ 1 kHz (G = 1) 50 Excellent ac specifications ×1 40 90 dB minimum CMRR (G = 10); 70 dB minimum CMRR (G = 1) 30 at 60 Hz, 1 kΩ source imbalance 1 10 100 1k 10k 100k
02 0 8-
800 kHz bandwidth (G = 1) FREQUENCY (Hz)
77 00
20 μs settling time to 0.01% (G = 10)
Figure 2. CMR vs. Frequency, 5 VS, 0 VS
APPLICATIONS Low power medical instrumentation
The AD623 holds errors to a minimum by providing superior
Transducer interfaces
ac CMRR that increases with increasing gain. Line noise, as
Thermocouple amplifiers
well as line harmonics, are rejected because the CMRR remains
Industrial process controls
constant up to 200 Hz. The AD623 has a wide input common-
Difference amplifiers
mode range and can amplify signals that have a common-mode
Low power data acquisition
voltage 150 mV below ground. Although the design of the AD623 was optimized to operate from a single supply, the AD623 still
GENERAL DESCRIPTION
provides superior performance when operated from a dual The AD623 is an integrated single-supply instrumentation voltage supply (±2.5 V to ±6.0 V). amplifier that delivers rail-to-rail output swing on a 3 V to 12 V Low power consumption (1.5 mW at 3 V), wide supply voltage supply. The AD623 offers superior user flexibility by allowing range, and rail-to-rail output swing make the AD623 ideal single gain set resistor programming and by conforming to the for battery-powered applications. The rail-to-rail output stage 8-lead industry standard pinout configuration. With no external maximizes the dynamic range when operating from low supply resistor, the AD623 is configured for unity gain (G = 1), and voltages. The AD623 replaces discrete instrumentation amplifier with an external resistor, the AD623 can be programmed for designs and offers superior linearity, temperature stability, and gains up to 1000. reliability in a minimum of space.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS SINGLE SUPPLY DUAL SUPPLIES BOTH DUAL AND SINGLE SUPPLIES ABSOLUTE MAXIMUM RATINGS ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION APPLICATIONS INFORMATION BASIC CONNECTION GAIN SELECTION REFERENCE TERMINAL INPUT AND OUTPUT OFFSET VOLTAGE INPUT PROTECTION RF INTERFERENCE GROUNDING Ground Returns for Input Bias Currents Output Buffering Single-Supply Data Acquisition System Amplifying Signals with Low Common-Mode Voltage INPUT DIFFERENTIAL AND COMMON-MODE RANGE vs. SUPPLY AND GAIN OUTLINE DIMENSIONS ORDERING GUIDE