ISO120G
Precision Low Cost ISOLATION AMPLIFIER
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 150µV/°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.
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