frequency to voltage

Jun 23, 2006 7 Replies
M

Hi , i should use a TC9402 (microchip) to convert very slow frequency to voltage.



My frequency range in between DC and 5 Hz... and i have some questions:


1) at page 1 of the datasheet they says "Operation: DC to 100 kHz", but at page 4 "Input FrequencyRange" section they says 10Hz to 100KHz... what are the right values ?


2) I want to try the schematic at page 16 with single supply (12V): the equation:VOUT = [VREF CREF RINT] FIN If want to get 1V/Hz , is it right to set: vref=5V cref=10u and Rint=20K ?


thanks to all...



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C

The datatsheet says its a voltage to frequency converter so the simple answer is no. Simple low frequency work is often easy to do mith a micro. Frequency ranges almost never include 0hz, decide what your real lower end is.

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M

[...] The devices can also be used as highly accurate Frequency- to-Voltage (F/V) converters, accepting virtually any input frequency waveform and providing a linearly proportional voltage output. [...]

My lowest frequence could be 0.5 Hz

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C

In that case small micro is the easiest way.

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C

Hardware is really simple, you need to convert your input to a logic level square wave. Connect to one of the interrupt lines. Use a pwm generator for your output. Connect it to a CR low pass network and your done, apart from the software.

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M

oh, right... i see... apart from the sw ;)

for this reason i was wondering if is there any IC was suitable for my problems...

snipped-for-privacy@aol.com wrote:

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C

A few hours work, unless your completely new to it. Lots of examples on microchips site to get you stared. Micros are such a big part of the industry today that you will have to learn sooner or later, so it might as well be now.

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