ISO122

ISO122 Precision Lowest Cost ISOLATION AMPLIFIER FEATURES q 100% TESTED FOR HIGH-VOLTAGE BREAKDOWN q q q q q RATED 1500Vrms HIGH IMR: 140dB at 60Hz BIPOLAR OPERATION: VO = ±10V 16-PIN PLASTIC DIP AND 28-LEAD SOIC EASE OF USE: Fixed Unity Gain Configuration APPLICATIONS q INDUSTRIAL PROCESS CONTROL: Transducer Isolator, Isolator for Thermocouples, RTDs, Pressure Bridges, and Flow Meters, 4mA to 20mA Loop Isolation q GROUND LOOP ELIMINATION q MOTOR AND SCR CONTROL q POWER MONITORING q PC-BASED DATA ACQUISITION q TEST EQUIPMENT q 0.020% max NONLINEARITY q ±4.5V to ±18V SUPPLY RANGE DESCRIPTION The ISO122 is a precision isolation amplifier incorporating a novel duty cycle modulation-demodulation technique. The signal is transmitted digitally across a 2pF differential capacitive barrier. With digital modulation the barrier characteristics do not affect signal integrity, resulting in excellent reliability and good high frequency transient immunity across the barrier. Both barrier capacitors are imbedded in the plastic body of the package. The ISO122 is easy to use. No external components are required for operation. The key specifications are 0.020% max nonlinearity, 50kHz signal bandwidth, and 200µV/°C VOS drift. A power supply range of ±4.5V to ±18V and quiescent currents of ±5.0mA on VS1 and ±5.5mA on VS2 make these amplifiers ideal for a wide range of applications. The ISO122 is available in 16-pin plastic DIP and 28lead plastic surface mount packages. +VS1 VIN VOUT –VS2 ...