HCPL-7860 datasheet(18/18 Pages) HP

18 / 18 page

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Data subject to change.

Obsolete 5989-1485EN

December 21, 2004

5989-2166EN

Voltage Sensing

The HCPL-7860/HCPL-786J

Isolated Modulator can also be

used to isolate signals with

amplitudes larger than its

recommended input range with

the use of a resistive voltage

divider at its input. The only

restrictions are that the

impedance of the divider be

relatively small (less than 1

Ω) so that the input

resistance (280 k

Ω) and input

bias current (1

µA) do not

affect the accuracy of the

measurement. An input bypass

capacitor is still required,

although the 39

Ω series

damping resistor is not (the

resistance of the voltage

divider provides the same

function). The low-pass filter

formed by the divider

resistance and the input

bypass capacitor may limit the

achievable bandwidth. To

obtain higher bandwidth, the

input bypass capacitor (C2)

can be reduced, but it should

not be reduced much below

1000 pF to maintain adequate

input bypassing of the isolated

modulator.

HCPL-7860 Datasheet(PDF) 18 Page - Agilent(Hewlett-Packard)

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