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on7nh
Joined: 05 Jun 2006 Posts: 41 Location: Belgium
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Pic Selection for Frequency measurements |
Posted: Mon Sep 03, 2007 12:07 am |
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Hy group,
i have a simple question,
i need a PIC for creating a locked frequency oscilator
my idea....input from de oscilator direct on the input of a counter (13.000Mhz Maximum)
The input of a GPS 1 hz output on a interrupt input (B0?)
i need to calculate the last 200Khz from this oscilator,
and i have a output (i2c) to set a DAC8574 16bit D/A Converter
the output of this converter regulate the frequency of the oscilator
the oscilator runs on 12.8 Mhz (+-200 Khz)
With PIC do i select for this topic and any ideas hou to do this in C ?
Many Thanks,
Carl |
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icesynth
Joined: 03 Sep 2007 Posts: 32 Location: Edmonton, Alberta
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Posted: Mon Sep 03, 2007 5:22 pm |
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Need a little clarification...
You need an oscillator that ranges from 12.6MHZ to 13MHz, What kind of output? Sine, or programmable ( ie, the DAC? ), What frequency are the steps required to be? 10Khz or so? And how precise does it need to be? |
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on7nh
Joined: 05 Jun 2006 Posts: 41 Location: Belgium
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Posted: Mon Sep 03, 2007 11:49 pm |
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No,
The oscilator is a Voltage Regulated oscilator
output square
i need to count it in full 32 bit
with the 1 hz comming from the GPS receiver, i can regulate the 12.8 Mhz |
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