[time-nuts] Designing and building an OCXO and GPSDO
Mark Sims
holrum at hotmail.com
Mon Aug 11 16:56:43 UTC 2008
For your temperature sensor and/or ADC consider the Analog Devices AD537 voltage to frequency converter chip. It has an onboard temperature sensor or could be interfaced to a thermistor, etc. The on chip sensor has a fairly large thermal mass. If you need instantaneous response to temperature use a very small thermistor.
Since the output is frequency, any time nut worth his/her/its salt should be able to come up with a suitable counter circuit. One system that I did had the V/F freq set around 200 Hz. Counting a 16 MHz clock over 256 cycles of V/F waveform yielded microdegree resolution.
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