AWR2243: ADC and analog LPF details

Taro Shibata

Expert 7720 points

Part Number: AWR2243

Hi,

This is regarding ADC and analog LPF in AWR2243P.

An aliases after ADC sampling will be determined by ADC oversampling frequency and analog LPF specifications.

In order to avoid errors caused by the aliases, customer need to know followings.

(1) How many orders of the analog filter?

(2) Filter type is active or passive?

(3) Butterworth / Chebyshev / else?

(4) Cut-off frequency

(5) Oversampling frequency of ADC is 1.8GHz?

Thanks & Regards,

-Shibata

over 5 years ago

0 Vivek Dham over 5 years ago

TI__Guru 58035 points

Hello Shibata,

The analog LPF is a first order RC filter and has a loos cut off frequency of around 35Mhz. The main LPF filtering happens in the digital decimation chain using FIR filters. The digital provides > 60dB attenuation beyond the programmed ADC sampling frequency.

regards,

Vivek

0 Taro Shibata over 5 years ago in reply to Vivek Dham

TI__Expert 7720 points

Hi Vivek,

Thanks for the information.

Could you also answer my question (5)?

Regards,

-Shibata

0 Vivek Dham over 5 years ago in reply to Taro Shibata

TI__Guru 58035 points

Yes, the ADC is operating at 1.8Ghz,

0 Taro Shibata over 5 years ago in reply to Vivek Dham

TI__Expert 7720 points

Thanks Vivek.

Regards,

-Shibata

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AWR2243: ADC and analog LPF details