HCPL-7560 Datasheet, PDF (18/18 Pages) Agilent(Hewlett-Packard) – Optically Isolated Sigma-Delta Modulator

Voltage Sensing
The HCPL-7560 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 kΩ) so that the input
resistance (280 kΩ) and input
bias current (1µA) do not
affect the accuracy of the
measurement. An input bypass
capacitor is still required,
although the 39Ω 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.
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Data subject to change.
Copyright © 2005 Agilent Technologies, Inc.
February 2, 2005
Obsoletes 5989-1422EN
5989-2164EN