OUTP

OUTN

VDD2

GND2

GND1

VCAP

IN

VDD1

ISO224

Isolated

4.5 V to 18 V

4.5 V to 5.5 V

ADS7945

14-Bit ADC

Up to ±12 V

optional

optional

GND1

GND2

Clamp

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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.

ISO224

SBAS738A – JUNE 2018 – REVISED OCTOBER 2018

ISO224 Reinforced Isolated Amplifier

With Single-Ended Input of ±12 V and Differential Output of ±4 V

1

1 Features

1

•

Offered in High-Grade (ISO224B) and Low-Grade

(ISO224A) Versions

•

±12-V Input Voltage Range Optimized for Isolated

Voltage Measurement in Industrial Applications

•

Overvoltage Input Clamp With 9-kV ESD

•

±4-V Differential Output Voltage Range With

Common-Mode at VDD2 / 2

•

Low DC-Error Operation (ISO224B):

–

Input Offset: ±5 mV at 25°C, ±15 µV/°C max

–

Gain Error: ±0.3% at 25°C, ±35 ppm/°C max

–

Nonlinearity: ±0.01% max, ±0.1 ppm/°C typ

•

4.5-V to 18-V Single-Supply on High-Side

•

4.5-V to 5.5-V Operation on Low-Side

•

Safety-Related Certifications:

–

7071-VPEAK Reinforced Isolation per DIN VDE

V 0884-11: 2017-01

–

5000-VRMS Isolation for 1 Minute per UL1577

•

High CMTI (ISO224B): 80 kV/µs (typ)

2 Applications

•

Isolated Analog Signal Acquisition in:

–

Grid Automation

–

Protection Relays

–

Factory Automation and Control

–

Rail Transport

–

Motor Drives

–

Power Analyzers

3 Description

The ISO224 is a precision isolated amplifier with an

output separated from the input circuitry by an

isolation barrier with high immunity to magnetic

interference. This barrier is certified to provide

reinforced galvanic isolation of up to 5 kVRMS with an

exceptionally long lifetime and low power dissipation.

When used with isolated power supplies, this device

separates parts of the system that operate on

different common-mode voltage levels and protects

lower-voltage devices from damage.

The input of the ISO224 is optimized for accurate

sensing of ±10-V signals that are widely used in

industrial applications. The device operates of a

single supply on the high-side. This unique feature

simplifies the design of the isolated power supply and

reduces the system cost. The integrated high-side

supply voltage detection feature simplifies system

level diagnostics. The ±4-V output of the ISO224

allows lower-cost analog-to-digital converters (ADCs)

to be used. The differential structure of the output

supports high immunity to noise.

The ISO224 is fully specified over the extended

industrial temperature range of –55°C to +125°C and

is available in a wide-body 8-pin SOIC (DWV)

package.

Device Information(1)

DEVICE NAME

PACKAGE

BODY SIZE

ISO224

SOIC (8)

5.85 mm × 7.5 mm

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

the end of the datasheet.

Simplified Schematic