[casper] KatADC counts to volts

[Tom Kuiper]

The KatADC is based on the Texas Instruments ADC08D1520. It is an 8-bit 
(255-level) ADC operating between +/- 50 mV (0.392 mV/step). The KatADC 
has a 20 dB amplifier (factor of 10 voltage gain).  So this gives it an 
input range of +/- 5 mV, or 0.0392 mV/step (39.2 uV/step).  In the KAT 
RFI 16K spectrometer code I see a count to mV scale factor of 3.93.  I'm 
missing something.  Can anyone set me straight?

Thanks
Tom

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