TC9400_06 MICROCHIP [Microchip Technology], TC9400_06 Datasheet - Page 14

• Manufacturer Part Number: TC9400_06
• Description: Voltage-to-Frequency/Frequency-to-Voltage Converters
• Manufacturer: MICROCHIP [Microchip Technology]

TC9400/9401/9402
6.0
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 resis-
tor, 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.
DS21483C-page 14
FREQUENCY-TO-VOLTAGE
(F/V) CIRCUIT DESCRIPTION
INT
) across R
INT
averages these
REF
∞ V
REF
)
© 2006 Microchip Technology Inc.