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FUNCTIONAL BLOCK DIAGRAM

REV. A

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a

General Purpose

Input Isolation Amplifier

AD102/AD104

FEATURES

Integral Isolated Power Supply

500 V rms CMV Isolation Rating (100% Tested)

High Accuracy:

0.05% Max Nonlinearity

Small SIP Style Footprint

Lowest Priced Isolation Amplifiers

APPLICATIONS

Single/Multichannel Data Acquisition Systems

Process Control Input Signal Isolation

Motor Control

Utility Power Monitoring

General Input Protection Circuits

Ground Loop Interruption

GENERAL DESCRIPTION

The AD102 and AD104 are general purpose, two-port, isolation

amplifiers suitable for use where input signal isolation is desired.

Each offers a functionally complete, compact isolation solution

rated at 500 V rms common mode, based upon the proven and

reliable transformer-coupled, galvanic isolation technique used

in all AD200 series isolation amplifier products.

Each model is offered in a minimum footprint package requiring

no external components to operate. Though similar to the

AD202 and AD204, the AD102 and AD104 models are in-

tended as lower cost solutions where the performance of the

AD202 or AD204 is not demanded.

Both the AD102 and AD104 can be used in applications where

input-to-input and/or input-to-system isolation is desired. The

AD102 is best suited for single input uses as it requires only

+15 V dc power to operate. It may also be appropriate for

multichannel applications when input-to-input isolation is not

required such as where a single input multiplexer selects a spe-

cific channel prior to isolation.

For applications where input to input isolation is required, the

AD104 may be a more desirable choice. It offers the lowest cost

per channel especially when powered from a common clock

source, the cost of which may be amortized over many channels.

The clock necessary for AD104 operation is a 25 kHz, 15 V p-p

square wave applied to the clock input pin. Most standard oscil-

lator components like a CD4047 or TL555 may be used, or a

designer may choose the AD246 clock driver developed for the

AD204 product.

PRODUCT HIGHLIGHTS

Complete, Single Device Solution for Input Isolation

The AD102 offers full isolation without external parts or need

for an external dc/dc power source. The AD104 features the

same functionality at a lower price for multichannel uses when

supplied with a 25 kHz clock signal.

High Accuracy

A maximum nonlinearity of 0.05% is specified for both the

AD102 and AD104 over the rated temperature range.

Wide Bandwidth

Each is specified with a full power (–3 dB) bandwidth. The

AD104 at 4 kHz and the AD102 at 1.5 kHz.

High Performance Common-Mode Rejection

While providing continuous 500 V rms isolation, greater than

100 dB rejection is provided. Each part has only 5.5 pF (typical)

of common-mode input capacitance.

Uncommitted Input Stage

Both models offer an uncommitted op amp input stage for user

flexibility and input gain optimization up to 100 V/V.

Low Power Consumption

The AD104 consumes only 35 mW from the clock source, the

AD102 only 75 mW from the +15 V dc supply.

±5V

FS

SIGNAL

ICOM

PWR/CLK

COM

25kHz

POWER

DEMOD

AMPLIFIER

AND

MODULATOR

POWER

RECTIFIER

OSCILLATOR

FILTER

AD102

OUT H I

OUT LO

+15V DC

IN+

IN–

FB 3

6

5

4

9

1

7

2