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.