1 Features

1• 100% Tested for High-Voltage Breakdown

• Rated 1500 Vrms

• High IMR: 140 dB at 60 Hz

• Bipolar Operation: VO = ±10 V

• 16-Pin Plastic DIP and 28-Lead SOIC

• Ease of Use: Fixed Unity Gain Configuration

• 0.020% Maximum Nonlinearity

• ±4.5-V to ±18-V Supply Range

2 Applications

• Industrial Process Control:

– Transducer Isolator, Isolator for

Thermocouples, RTDs, Pressure Bridges, and

Flow Meters, 4-mA to 20-mA Loop Isolation

• Ground Loop Elimination

• Motor and SCR Control

• Power Monitoring

• PC-Based Data Acquisition

• Test Equipment

3 Description

The ISO122 is a precision isolation amplifier

incorporating a novel duty cycle modulation- demodulation technique. The signal is transmitted

digitally across a 2-pF differential capacitive barrier.

With digital modulation the barrier characteristics do

not affect signal integrity, thus 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% maximum nonlinearity, 50-kHz signal

bandwidth, and 200-V/°C VOS drift. A power supply range of 4.5 V to 18 V and quiescent currents of 5

mA on VS1 and ±5.5 mA on VS2 make the ISO122

ideal for a wide range of applications.

The ISO122 is available in 16-pin plastic DIP and

28-lead plastic surface-mount packages.