Figure 1.
Schematic Diagram for a Frequency-to-Voltage Converter Using the 9400
Figure 1
shows the basic application circuit for using the 9400 in
frequency-to-voltage (F-V) conversion. The 9400 is a 14-pin
voltage-to-frequency/frequency-to-voltage converter IC. Note that
the circuit in Figure 1 needs two voltage supplies (+5V and -5V).
The output
voltage Vout of this circuit varies in linear proportion to the input
frequency Fin, which can range from DC to 10 kHz. Also, the output
of this circuit may exhibit a ripple that is inversely proportional to
the value of Cint and the input frequency. Thus, if the input
frequency is low, Cint must be increased to reduce the ripple at the
output. Another way to reduce the output ripple of this circuit is
by using a ripple eliminator
circuit.
See Also:
Single-Supply 9400-Based V-F
Converter;
Dual-Supply 9400-Based V-F
Converter;
Ripple Remover
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