ISO120 Datasheet, PDF (1/16 Pages) Burr-Brown (TI) – Precision Low Cost ISOLATION AMPLIFIER

ISO120
ISO121
SBOS158
Precision Low Cost
ISOLATION AMPLIFIER
FEATURES
q 100% TESTED FOR PARTIAL DISCHARGE
q ISO120: Rated 1500Vrms
q ISO121: Rated 3500Vrms
q HIGH IMR: 115dB at 60Hz
q USER CONTROL OF CARRIER
FREQUENCY
q LOW NONLINEARITY: ±0.01% max
q BIPOLAR OPERATION: V_O = ±10V
q 0.3"-WIDE 24-PIN HERMETIC DIP, ISO120
q SYNCHRONIZATION CAPABILITY
q WIDE TEMP RANGE: –55°C to +125°C
(ISO120)
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL: Trans-
ducer Isolator for Thermocouples, RTDs,
Pressure Bridges, and Flow Meters, 4mA
to 20mA Loop Isolation
q GROUND LOOP ELIMINATION
q MOTOR AND SCR CONTROL
q POWER MONITORING
q ANALYTICAL MEASUREMENTS
q BIOMEDICAL MEASUREMENTS
q DATA ACQUISITION
q TEST EQUIPMENT
DESCRIPTION
The ISO120 and ISO121 are precision isolation ampli-
fiers incorporating a novel duty cycle modulation-
demodulation 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 immu-
nity 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 compo-
nents are required for 60kHz bandwidth. With the
addition of two external capacitors, precision specifi-
cations of 0.01% max nonlinearity and 150µV/°C max
V_OS drift are guaranteed with 6kHz bandwidth. A
power supply range of ±4.5V to ±18V and low quies-
cent current make these amplifiers ideal for a wide
range of applications.
C_1H
C_1L
V_IN
Signal
Com 1
Ext Osc
+V_S1
Gnd 1
–V_S1
Isolation Barrier
C_2H
C_2L
Sense
V_OUT
Signal
Com 2
–V_S2
Gnd 2
+V_S2
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© 1988 Burr-Brown Corporation
PDS-820D
Printed in U.S.A. March, 1992