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Description
The AP7510 utilizes an unique
combination of digital and analog
conversion techniques, which
features adjustable scaling
and approaches the nearly absolute
accuracy of purely digital fre-
quency division. The Frequency
Scaler accepts a variety of
signal inputs, such as sine
wave, square wave and pulses.
It can also accept a contact
closure input by attaching a
jumper across pins 4 and 6.
A top-mounted, single-turn sensitivity
potentiometer permits an adjustable
input sensitivity from 50mV
to 5V. The conditioned and amplified
frequency input is fed into
an opto coupler, which consists
of an LED and a phototransistor
encapsu- lated in the same housing.
The
opto-coupler provides full DC
to DC isolation and feeds the
input into the digital frequency
divider circuitry. The input
is then divided down and channeled
through an over-current-protected
output driver. The result is
a proportionally reduced square
wave frequency output. If a
5V TTL-compatible output is
desired, use pins 9 and 10 for
output. If a 24V square wave
output is desired, connect the
load between pins 7 and 9.
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Applications
The AP7510 Frequency Scaler
can be used to directly interface
between totalizers and turbine
flowmeters, magnetic tachometer
sensors and other frequency
transducers. A continuously
adjust- able scaling factor
(input-to-output ratio) of 0.00001
to 0.99999 is provided to precisely
match the frequency transducer
and totalizer. The AP7510 provides
a square wave output which can
be used to drive electronic
counters with TTL, CMOS, or
24V inputs.
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