Datasheet AD627 (Analog Devices)

Micropower, Single- and Dual-Supply, Rail-to-Rail Instrumentation Amplifier Data Sheet AD627 FEATURES FUNCTIONAL BLOCK DIAGRAM Micropower, 85 μA maximum supply current AD627 R 1 8 R Wide power supply range (+2.2 V to ±18 V) G G Easy to use –IN 2 7 +VS Gain set with one external resistor +IN 3 6 OUTPUT Gain range 5 (no resistor) to 1000
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Higher performance than discrete designs –V 4
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S 5 REF
2- 78
Rail-to-rail output swing
00 Figure 1. 8-Lead PDIP (N) and SOIC_N (R)
High accuracy dc performance 0.03% typical gain accuracy (G = +5) (AD627A) 100 10 ppm/°C typical gain drift (G = +5) 90 125 μV maximum input offset voltage (AD627B d ual supply) 80 AD627 200 μV maximum input offset voltage (AD627A dual sup ply) 70 1 μV/°C maximum input offset voltage drift (AD627B) 60 3 μV/°C maximum input offset voltage drift (AD627A) B) d 10 nA maximum input bias current 50 RR ( TRADITIONAL Noise: 38 nV/√Hz RTI noise at 1 kHz (G = +100) CM 40 LOW POWER DISCRETE DESIGN Excellent ac specifications 30 AD627A: 7 7 dB minimum CMRR (G = +5) 20 AD627B: 83 dB minimum CMRR (G = +5) 10 80 kHz bandwidth (G = +5)
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135 μs settling time to 0.01% (G = +5, 5 V step) 01 10 100 1k 10k
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FREQUENCY (Hz)
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APPLICATIONS
Figure 2. CMRR vs. Frequency, ±5 VS, Gain = +5
4 mA to 20 mA loop-powered applications Low power medical instrumentation—ECG, EEG Transducer interfacing Thermocouple amplifiers Industrial process controls Low power data acquisition Portable battery-powered instruments GENERAL DESCRIPTION
ideal for battery-powered applications. Its rail-to-rail output The AD627 is an integrated, micropower instrumentation stage maximizes dynamic range when operating from low amplifier that delivers rail-to-rail output swing on single and supply voltages. Dual-supply operation (±15 V) and low power dual (+2.2 V to ±18 V) supplies. The AD627 provides excellent consumption make the AD627 ideal for industrial applications, ac and dc specifications while operating at only 85 μA maximum. including 4 mA to 20 mA loop-powered systems. The AD627 offers superior flexibility by allowing the user to set The AD627 does not compromise performance, unlike other the gain of the device with a single external resistor while con- micropower instrumentation amplifiers. Low voltage offset, forming to the 8-lead industry-standard pinout configuration. offset drift, gain error, and gain drift minimize errors in the With no external resistor, the AD627 is configured for a gain of 5. system. The AD627 also minimizes errors over frequency by With an external resistor, it can be set to a gain of up to 1000. providing excellent CMRR over frequency. Because the CMRR remains high up to 200 Hz, line noise and line harmonics are A wide supply voltage range (+2.2 V to ±18 V) and micropower rejected. current consumption make the AD627 a perfect fit for a wide range of applications. Single-supply operation, low power The AD627 provides superior performance, uses less circuit consumption, and rail-to-rail output swing make the AD627 board area, and costs less than micropower discrete designs.
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Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Single Supply Dual Supply Dual and Single Supplies Absolute Maximum Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Using the AD627 Basic Connections Setting the Gain Reference Terminal Input Range Limitations in Single-Supply Applications Output Buffering Input and Output Offset Errors Make vs. Buy: A Typical Application Error Budget Errors Due to AC CMRR Ground Returns for Input Bias Currents Layout and Grounding Input Protection RF Interference Applications Circuits Classic Bridge Circuit 4 mA to 20 mA Single-Supply Receiver Thermocouple Amplifier Outline Dimensions Ordering Guide