AD629BR-REEL

AD629BR-REEL FEATURES

Improved replacement for: INA117P and INA117KU±270 V common-mode voltage rangeInput protection to±500 V common mode±500 V differential modeWide power supply range (±2.5 V to ±18 V)±10 V output swing on ±12 V supply1 mA maximum power supply currentHIGH ACCURACY DC PERFORMANCE3 ppm maximum gain nonlinearity (AD629B)20 μV/°C maximum offset drift (AD629A)10 μV/°C maximum offset drift (AD629B)10 ppm/°C maximum gain driftEXCELLENT AC SPECIFICATIONS77 dB minimum CMRR @ 500 Hz (AD629A)86 dB minimum CMRR @ 500 Hz (AD629B)500 kHz bandwidth

AD629BR-REEL GENERAL DESCRIPTION

The AD629 is a difference amplifier with a very high input,common-mode voltage range. It is a precision device that allowsthe user to accurately measure differential signals in thepresence of high common-mode voltages up to ±270 V.The AD629 can replace costly isolation amplifiers inapplications that do not require galvanic isolation. The deviceoperates over a ±270 V common-mode voltage range and hasinputs that are protected from common-mode or differentialmode transients up to ±500 V.The AD629 has low offset, low offset drift, low gain error drift,low common-mode rejection drift, and excellent CMRR over awide frequency range.The AD629 is available in die and packaged form featuring8-lead PDIP and 8-lead SOIC packages. For all packages(including die) and grades, performance is guaranteed overthe industrial temperature range of −40°C to +85°C.FREQUENCY (Hz)COMMON-MODE REJECTION RATIO (dB)10050556065707580859095201001k10k20k00783-002Figure 2. Common-Mode Rejection Ratio vs. FrequencyCOMMON-MODE VOLTAGE (V)OUTPUT ERROR (2mV/DIV)–240240120–120000783-0032mV/DIV60V/DIVFigure 3. Error Voltage vs. Input Common-Mode Voltage

AD629BR-REEL APPLICATIONS

High voltage current sensingBattery cell voltage monitorsPower supply current monitorsMotor controlsIsolation