AD8220BRMZ-R7

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1. DESCRIPTION

The AD8220BRMZ-R7 is the first single-supply, JFET input instrumentation amplifier available in an MSOP package. Designed to meet the needs of high performance, portable instrumentation, the AD8220BRMZ-R7 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 5 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial temperature range. Despite the JFET inputs, the AD8220BRMZ-R7 typically has a noise corner of only 10 Hz. With the proliferation of mixed-signal processing, the number of power supplies required in each system has grown. The AD8220BRMZ-R7 is designed to alleviate this problem. The AD8220 can operate on a ±18 V dual supply, as well as on a single +5 V supply. Its railto-rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need to use higher voltage, dual supplies. The AD8220BRMZ-R7 draws a maximum of 750 μA of quiescent current, making it ideal for battery powered devices.  Gain is set from 1 to 1000 with a single resistor. Increasing the gain increases the common-mode rejection. Measurements that need higher CMRR when reading small signals benefit when the AD8220BRMZ-R7 is set for large gains. A reference pin allows the user to offset the output voltage. This feature is useful when interfacing with analog-to-digital converters. The AD8220BRMZ-R7 is available in an MSOP that takes roughly half the board area of an SOIC. Performance for the A and B grade is specified over the industrial temperature range of −40°C to +85°C, and the W grade is specified over the automotive temperature range of −40°C to +125°C. 

2. FEATURES

    1. Low input currents

        - 10 pA maximum input bias current (B grade)

        - 0.6 pA maximum input offset current (B grade) 

    2. High CMRR

        - 100 dB CMRR (minimum), G = 10 (B grade)

        - 80 dB CMRR (minimum) to 5 kHz, G = 1 (B grade)

    3. Excellent ac specifications and low power

        - 1.5 MHz bandwidth (G = 1)

        - 14 nV/√Hz input noise (1 kHz)

        - Slew rate: 2 V/μs

        - 750 μA quiescent supply current (maximum)

    4. Versatile

        - MSOP package

        - Rail-to-rail output

        - Input voltage range to below negative supply rail

        - 4 kV ESD protection

        - 4.5 V to 36 V single supply

        - ±2.25 V to ±18 V dual supply

        - Gain set with single resistor (G = 1 to 1000)

    5. Qualified for automotive applications

3. APPLICATIONS

    1. Medical instrumentation

    2. Precision data acquisition

    3. Transducer interfaces