FEATURES

100% TESTED FOR PARTIAL DISCHARGE

ISO120: Rated 1500Vrms

ISO121: Rated 3500Vrms

HIGH IMR: 115dB at 60Hz

USER CONTROL OF CARRIER

FREQUENCY

LOW NONLINEARITY: ±0.01% max

BIPOLAR OPERATION: VO = ±10V

0.3-WIDE 24-PIN HERMETIC DIP, ISO120

SYNCHRONIZATION CAPABILITY

WIDE TEMP RANGE: –55°C to +125°C

(ISO120)

APPLICATIONS

INDUSTRIAL PROCESS CONTROL: Transducer

Isolator for Thermocouples, RTDs,

Pressure Bridges, and Flow Meters, 4mA

to 20mA Loop Isolation

GROUND LOOP ELIMINATION

MOTOR AND SCR CONTROL

POWER MONITORING

ANALYTICAL MEASUREMENTS

BIOMEDICAL MEASUREMENTS

DATA ACQUISITION

TEST EQUIPMENT

DESCRIPTION

The ISO120 and ISO121 are precision isolation amplifiers

incorporating a novel duty cycle modulationdemodulation

technique. The signal is transmitted

digitally across a 2pF differential capacitive barrier.

With digital modulation the barrier characteristics do

not affect signal integrity, which results in excellent

reliability and good high frequency transient immunity

across the barrier. Both the amplifier and barrier

capacitors are housed in a hermetic DIP. The ISO120

and ISO121 differ only in package size and isolation

voltage rating.

These amplifiers are easy to use. No external components

are required for 60kHz bandwidth. With the

addition of two external capacitors, precision specifications

of 0.01% max nonlinearity and 150mV/°C max

VOS drift are guaranteed with 6kHz bandwidth. A

power supply range of ±4.5V to ±18V and low quiescent

current make these amplifiers ideal for a wide

range of applications.