AD8277（Low Power, Wide Supply Range, Low Cost,Unity-Gain Difference Amplifier）IntroductionThe 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.FeatureWide input range beyond suppliesRugged input overvoltage protectionLow supply current: 200μA maximum per channelLow power dissipation: 0.5 mW at VS= 2.5 VBandwidth: 550 kHzCMRR: 86 dB minimum, dc to 10 kHzLow offset voltage drift: ±2 μV/°C maximum (B Grade)Low gain drift: 1 ppm/°C maximum (B Grade)Enhanced slew rate: 1.1 V/μsWide power supply range: – Single supply: 2 V to 36 V – Dual supplies:±2 V to ±18 VAppearance
