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NE564 as a FM demodulator - a question

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lovemini

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ne564d

I use NE564D as a FM demodulator.

Question:
is the output of Pin9 FM sinal or carrier frequency(single frequency)?
 

HO_220

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pin 14 ne564

hi.
for more information please read datasheet.
bests.
 

lovemini

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lovemini

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Re: application note

i know Pin9 is internal VCO output. when phase locked, the VCO output is as the same as INPUT FM Signal. so can i treat VCO-output as INTPUT FM signal?

flatulent said:
Here is an application note http://www.semiconductors.philips.com/acrobat/applicationnotes/AN1802.pdf with all sorts of information on FM demodulating with the 564.

Pin 9 is the internal VCO output. This is not the demodulated FM baseband output.
 

flatulent

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pin 9

The signal on pin 9 is a duplicate of the input to the chip (FM modulated signal). The signal on the VCO clontrol line is the demodulated audio.
 

lovemini

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Re: pin 9

thanks. it't right. the book i have read described incorrect.

flatulent said:
The signal on pin 9 is a duplicate of the input to the chip (FM modulated signal). The signal on the VCO clontrol line is the demodulated audio.
 

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