1 Features
1• 100% Tested for High-Voltage Breakdown
• Rated 1500 Vrms
• High IMR: 140 dB at 60 Hz
• Maximum Nonlinearity: 0.010%
• Bipolar Operation: VO = ±10 V
• Packages: PDIP-16 and SOIC-28
• Ease of Use: Fixed Unity Gain Configuration
• Supply Range: ±4.5-V to ±18-V

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 ISO124 is a precision isolation amplifier
incorporating a novel duty cycle modulationdemodulation
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 ISO124 is easy to use. No external components
are required for operation. The key specifications are
0.010% maximum nonlinearity, 50-kHz signal
bandwidth, and 200-μV/°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 ISO124
device a good choice for a wide range of applications.
The ISO124 is available in 16-pin PDIP and 28-lead
SOIC plastic surface-mount packages.