TVRX IF frequency

In data sheet of Microtune 4937 DI5, the IF frequency of a tuner comes
to 5.75MHz.

But according to it directly measures(pin17,18) with spectrum analyzer,
IF frequency is 44MHz.

Moreover, DDC values comes out to -20M if ‘’ is carried out.

So the ADC is 64MSPS, I don’t know why DDC is -20M and why IF frequency
44MHz… is it possible figure?

Sang-Won Kim @Cognitive Radio Research Team

Tel : +82-42-860-4850 Fax : +82-42-860-5199

email : mailto:[email protected] [email protected]