AD8225ARZ

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1. DESCRIPTION

The AD8225ARZ is an instrumentation amplifier with a fixed gain of 5, which sets new standards of performance. The superior CMRR of the AD8225ARZ enables rejection of high frequency common-mode voltage (80 dB Min @ 10 kHz). As a result, higher ambient levels of noise from utility lines, industrial equipment, and other radiating sources are rejected. Extended CMV range enables the AD8225ARZ to extract low level differential signals in the presence of high common-mode dc voltage levels even at low supply voltages. Ambient electrical noise from utility lines is present at 60 Hz and harmonic frequencies. Power systems operating at 400 Hz create high noise environments in aircraft instrument clusters. Good CMRR performance over frequency is necessary if power system generated noise is to be rejected. The dc to 10 kHz CMRR performance of the AD8225ARZ rejects noise from utility systems, motors, and repair equipment on factory floors, switching power supplies, and medical equipment. Low input bias currents combined with a high slew rate of 5 V/µs make the AD8225ARZ ideally suited for multiplexed applications. The AD8225ARZ provides excellent dc precision, with maximum input offset voltage of 150 µV and drift of 2 µV/°C. Gain drift is 5 ppm/°C or less. Operating on either single or dual supplies, the fixed gain of 5 and wide input common-mode voltage range make the AD8225ARZ well suited for patient monitoring applications. The AD8225ARZ is packaged in an 8-lead SOIC package and is specified over the standard industrial temperature range, –40°C to +85°C.

2. FEATURES

    1. No External Components Required

    2. Highly Stable, Factory Trimmed Gain of 5

    3. Low Power, 1.2 mA Max Supply Current

    4. Wide Power Supply Range (
1.7 V to
18 V)

    5. Single- and Dual-Supply Operation

    6. Excellent Dynamic Performance

        - High CMRR

           - 86 dB Min @ DC

           - 80 dB Min to 10 kHz

        - Wide Bandwidth

           - 900 kHz

           - 4 V to 36 V Single Supply

        - High Slew Rate

           - 5 V/s Min

    7. Outstanding DC Precision

        - Low Gain Drift

           - 5 ppm/C Max

        - Low Input Offset Voltage

           - 150 V Max

        - Low Offset Drift

           - 2 V/C Max

        - Low Input Bias Current

           - 1.2 nA Max

3. APPLICATIONS

    1. Patient Monitors

    2. Current Transmitters

    3. Multiplexed Systems

    4. 4 to 20 mA Converters

    5. Bridge Transducers

    6. Sensor Signal Conditioning