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–V

S1

Gnd

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S2

Gnd

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ISO122

SBOS160A – NOVEMBER 1993 – REVISED JANUARY 2015

ISO122 Precision Lowest-Cost Isolation Amplifier

1 Features

3 Description

The

ISO122

is

a

precision

isolation

amplifier

1

•

100% Tested for High-Voltage Breakdown

incorporating

a

novel

duty

cycle

modulation-

•

Rated 1500 Vrms

demodulation technique. The signal is transmitted

•

High IMR: 140 dB at 60 Hz

digitally across a 2-pF differential capacitive barrier.

With digital modulation the barrier characteristics do

•

Bipolar Operation: VO = ±10 V

not affect signal integrity, thus resulting in excellent

•

16-Pin Plastic DIP and 28-Lead SOIC

reliability and good high-frequency transient immunity

•

Ease of Use: Fixed Unity Gain Configuration

across the barrier. Both barrier capacitors are

imbedded in the plastic body of the package.

•

0.020% Maximum Nonlinearity

•

±4.5-V to ±18-V Supply Range

The ISO122 is easy to use. No external components

are required for operation. The key specifications are

2 Applications

0.020%

maximum

nonlinearity,

50-kHz

signal

bandwidth, and 200-V/°C VOS drift. A power supply

•

Industrial Process Control:

range of 4.5 V to 18 V and quiescent currents of 5

–

Transducer Isolator, Isolator for

mA on VS1 and ±5.5 mA on VS2 make the ISO122

Thermocouples, RTDs, Pressure Bridges, and

ideal for a wide range of applications.

Flow Meters, 4-mA to 20-mA Loop Isolation

The ISO122 is available in 16-pin plastic DIP and

•

Ground Loop Elimination

28-lead plastic surface-mount packages.

•

Motor and SCR Control

Device Information(1)

•

Power Monitoring

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

PC-Based Data Acquisition

PDIP (16)

17.90 mm × 7.50 mm

•

Test Equipment

ISO122

SOIC (28)

20.01 mm × 6.61 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

4 Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.