TC9402 datasheet(8/24 Pages) MICROCHIP

Part #	TC9402

Description	Voltage-to-Frequency/Frequency-to-Voltage Converters

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

Logo

8 / 24 page

TC9400/9401/9402

DS21483C-page 8

3.2

Voltage-to-Time Measurements

The TC9400 output can be measured in the time

domain as well as the frequency domain. Some micro-

computers, for example, have extensive timing capabil-

ity, but limited counter capability. Also, the response

time of a time domain measurement is only the period

between two output pulses, while the frequency mea-

surement must accumulate pulses during the entire

counter time-base period.

Time measurements can be made from either the

TC9400’s PULSE FREQ OUT output, or from the

FREQ/2 OUT output. The FREQ/2 OUT output

changes state on the rising edge of PULSE FREQ

OUT, so FREQ/2 OUT is a symmetrical square wave at

one-half the pulse output frequency. Timing measure-

ments can, therefore, be made between successive

PULSE FREQ OUT pulses, or while FREQ/2 OUT is

high (or low).

TC9402 Datasheet(PDF) 8 Page - Microchip Technology