tc9400 Microchip Technology Inc., tc9400 Datasheet - Page 13

• Manufacturer Part Number: tc9400
• Description: Voltage-to-frequency / Frequency-to-voltage Converters
• Manufacturer: Microchip Technology Inc.

5.0
When used as an F/V converter, the TC9400 generates
an output voltage linearly proportional to the input
frequency waveform.
Each zero crossing at the threshold detector’s input
causes a precise amount of charge (q = C
to be dispensed into the op amp’s summing junction.
This charge, in turn, flows through the feedback
resistor, generating voltage pulses at the output of the
op amp. A capacitor (C
pulses into a DC voltage, which is linearly proportional
to the input frequency.
© 2007 Microchip Technology Inc.
FREQUENCY-TO-VOLTAGE
(F/V) CIRCUIT DESCRIPTION
INT
) across R
INT
averages these
REF
x V
REF
)
TC9400/9401/9402
DS21483D-page 13