Datasheet

Precision Lowest Cost
ISOLATION AMPLIFIER
FEATURES
● 100% TESTED FOR HIGH-VOLTAGE
BREAKDOWN
● RATED 1500Vrms
● HIGH IMR: 140dB at 60Hz
● BIPOLAR OPERATION: V
O
= ±10V
● 16-PIN PLASTIC DIP AND 28-LEAD SOIC
● EASE OF USE: Fixed Unity Gain
Configuration
● 0.020% max NONLINEARITY
●
±4.5V to ±18V SUPPLY RANGE
APPLICATIONS
● INDUSTRIAL PROCESS CONTROL:
Transducer Isolator, Isolator for Thermo-
couples, RTDs, Pressure Bridges, and
Flow Meters, 4mA to 20mA Loop Isolation
● GROUND LOOP ELIMINATION
● MOTOR AND SCR CONTROL
● POWER MONITORING
● PC-BASED DATA ACQUISITION
● TEST EQUIPMENT
V
OUT
V
IN
+V
S1
ISO122
DESCRIPTION
The ISO122 is a precision isolation amplifier incor-
porating a novel duty cycle modulation-demodulation
technique. The signal is transmitted digitally across
a 2pF differential capacitive barrier. With digital modu-
lation the barrier characteristics do not affect signal
integrity, 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% max nonlinearity, 50kHz signal bandwidth,
and 200µV/°C V
OS
drift. A power supply range of
±4.5V to ±18V and quiescent currents of ±5.0mA on
V
S1
and ±5.5mA on V
S2
make these amplifiers ideal
for a wide range of applications.
The ISO122 is available in 16-pin plastic DIP and 28-
lead plastic surface mount packages.
–V
S1
Gnd
+V
S2
–V
S2
Gnd
©
1989 Burr-Brown Corporation PDS-857F Printed in U.S.A. November, 1993
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
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