Author Topic: how to demodulate signal using xr2211 ic for low freq 180hz and 340hz  (Read 939 times)

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Offline KheshavTopic starter

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i m trying to do fsk demodulation using xr2211 ic for f1=180hz and f2=340hz and baudrate of 206
i using this datasheet https://assets.maxlinear.com/web/documents/xr2211av104.pdf
and my values are
R0=39k + 10k(pot)
C0=0.1uf
R1= 100k
C1=5.6nf
Rf=510k
Cf=2.2nf
Rb=2.2M
RL=5.1k
i m not getting proper fsk data at pin 7

can anyone tell me what i am doing wrong
this my circuit diagram
 

Offline Terry Bites

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Re: how to demodulate signal using xr2211 ic for low freq 180hz and 340hz
« Reply #1 on: December 17, 2023, 01:42:20 pm »
With the components shown, your centre frequency is only 41Hz. It needs to be centred between the upper and lower fsk frequencies. More like 250Hz so Co~15n.
 


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