+V

S1

V

IN

V

OUT

–V

S1

+V

S2

Gnd 2

–V

S2

Gnd 1

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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.

ISO124

SBOS074D – SEPTEMBER 1997 – REVISED JULY 2016

ISO124 Precision Lowest-Cost Isolation Amplifier

1

1 Features

1

•

100% Tested for High-Voltage Breakdown

•

Rated 1500 Vrms

•

High IMR: 140 dB at 60 Hz

•

0.010% Maximum Nonlinearity

•

•

DIP-16 and SO-28

•

Ease of Use: Fixed Unity Gain Configuration

•

±4.5-V to ±18-V Supply Range

2 Applications

•

Industrial Process Control:

–

Transducer Isolator, Isolator for

Thermocouples, RTDs, Pressure Bridges, and

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

•

Ground Loop Elimination

•

Motor and SCR Control

•

Power Monitoring

•

PC-Based Data Acquisition

•

Test Equipment

3 Description

The

ISO124

is

a

precision

isolation

amplifier

incorporating

a

novel

duty

cycle

modulation-

demodulation technique. The signal is transmitted

digitally across a 2-pF differential capacitive barrier.

With digital modulation, the barrier characteristics do

not affect signal integrity, thus 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 ISO124 is easy to use. No external components

are required for operation. The key specifications are

0.010%

maximum

nonlinearity,

50-kHz

signal

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

device ideal for a wide range of applications.

The ISO124 is available in SOIC-16 and SOIC-28

plastic surface-mount packages.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

ISO124

SOIC (16)

17.90 mm × 7.50 mm

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