AD627ARZ-R7

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1. DESCRIPTION

The AD627ARZ-R7 is an integrated, micropower instrumentation amplifier that delivers rail-to-rail output swing on single and dual (+2.2 V to ±18 V) supplies. The AD627ARZ-R7 provides excellent ac and dc specifications while operating at only 85 μA maximum. The AD627ARZ-R7 offers superior flexibility by allowing the user to set the gain of the device with a single external resistor while conforming to the 8-lead industry-standard pinout configuration. With no external resistor, the AD627ARZ-R7 is configured for a gain of 5. With an external resistor, it can be set to a gain of up to 1000. A wide supply voltage range (+2.2 V to ±18 V) and micropower current consumption make the AD627ARZ-R7 a perfect fit for a wide range of applications. Single-supply operation, low power consumption, and rail-to-rail output swing make the AD627ARZ-R7 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD627ARZ-R7 ideal for industrial applications, including 4 mA to 20 mA loop-powered systems. The AD627ARZ-R7 does not compromise performance, unlike other micropower instrumentation amplifiers. Low voltage offset, offset drift, gain error, and gain drift minimize errors in the system. The AD627ARZ-R7 also minimizes errors over frequency by providing excellent CMRR over frequency. Because the CMRR remains high up to 200 Hz, line noise and line harmonics are rejected. The AD627ARZ-R7 provides superior performance, uses less circuit board area, and costs less than micropower discrete designs.

2. FEATURES

    1. Micropower, 85 μA maximum supply current

    2. Wide power supply range (+2.2 V to ±18 V)

    3. Easy to use

        - Gain set with one external resistor

        - Gain range 5 (no resistor) to 1000

    4. Higher performance than discrete designs

    5. Rail-to-rail output swing

        - 6. High accuracy dc performance

        - 0.03% typical gain accuracy (G = +5) (AD627A)

        - 10 ppm/°C typical gain drift (G = +5)

        - 125 μV maximum input offset voltage (AD627B dual supply)

        - 200 μV maximum input offset voltage (AD627A dual supply)

        - 1 μV/°C maximum input offset voltage drift (AD627B)

        - 3 μV/°C maximum input offset voltage drift (AD627A)

        - 10 nA maximum input bias current

    6. Noise: 38 nV/√Hz RTI noise at 1 kHz (G = +100)

    7. Excellent ac specifications

        - AD627A: 77 dB minimum CMRR (G = +5)

        - AD627B: 83 dB minimum CMRR (G = +5)

        - 80 kHz bandwidth (G = +5)

        - 135 μs settling time to 0.01% (G = +5, 5 V step)

3. APPLICATIONS

    1. 4 mA to 20 mA loop-powered applications

    2. Low power medical instrumentation—ECG, EEG

    3. Transducer interfacing

    4. Thermocouple amplifiers

    5. Industrial process controls

    6. Low power data acquisition

    7. Portable battery-powered instruments