AD8277 Difference Amplifier IC Chip

AD8277（Low Power, Wide Supply Range, Low Cost,Unity-Gain Difference Amplifier）

Introduction

The AD8276/AD8277 are general-purpose, unity-gain difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. They provide exceptional common-mode rejection ratio(86 dB) and high bandwidth while amplifying signals well beyond the supply rails. The on-chip resistors are laser-trimmed for excellent gain accuracy and high CMRR. They also have extremely low gain drift Vs. temperature.

The common-mode range of the amplifiers extends to almost double the supply voltage, making these amplifiers ideal for single-supply applications that require a high common-mode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amps.

The AD8276/AD8277 are unity-gain stable. While they are optimized for use as difference amplifiers, they can also be connected in high precision, single-ended configurations with G =-1,+1, +2. The AD8276/AD8277 provide an integrated precision solution that has smaller size, lower cost, and better performance than a discrete alternative.

The devices operate on single supplies (2.0V to 36V) or dual supplies (±2V to ±18V). The maximum quiescent supply current is 200 μA per channel, which is ideal for battery -operated and portable systems.

Feature

• Wide input range beyond supplies
• Rugged input overvoltage protection
• Low supply current: 200μA maximum per channel
• Low power dissipation: 0.5 mW at VS= 2.5 V
• Bandwidth: 550 kHz
• CMRR: 86 dB minimum, dc to 10 kHz
• Low offset voltage drift: ±2 μV/°C maximum (B Grade)
• Low gain drift: 1 ppm/°C maximum (B Grade)
• Enhanced slew rate: 1.1 V/μs
• Wide power supply range:
  – Single supply: 2 V to 36 V
  – Dual supplies:±2 V to ±18 V

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