PGA970: PGA970 Demodulator BPF coefficients

Alex Duranti

Part Number: PGA970

Good morning,

I have a request related to the demodulator BPF coefficients of PGA970.

In the datasheet are reported the filter coefficents multiple of 1000Hz.

For my specific application are required the following frequency : 2600,2700,2800,2850,2900,3000,3100,3150,3200,3300 and 3400 Hz.

Can you provide me a table of the coefficents for each one of the previous frequencies (with a bandwith of 20, 100 and 250 Hz)?

Thanks in advance,

Best regards,

Alex

over 1 year ago

0 Cole Macias over 1 year ago

TI__Mastermind 18900 points

Hi Alex,

Let me take a look at get back to you before the end of the week.

Thanks,

-Cole

0 Cole Macias over 1 year ago

TI__Mastermind 18900 points

Hi Alex,

My recommendation is to download the PGA970 GUI, use the ADC Capture page to select the BPF settings you want, and then go to the DEMODx_BPF_xx_x register and see the result. Like you pointed out, the filter can only be programmed with coefficients with the multiple of 1000Hz and you exact frequencies are not possible. So 3000Hz with up to 250Hz BW is you best bet.

Here's an example for the f_c = 3kHz and f_BW = 250Hz case: