ADS1601: Internal Antialias Filter Response of Converter

Howard Tetrault

Part Number: ADS1601

Is there a detailed response curve of the internal filter over the frequency range of 1kHz to 10 MHz for a 10MHz clock (sample rate output of 625kHz)?

over 7 years ago

0 Ryan Andrews over 7 years ago

TI__Guru 65386 points

Hello Howard,

Thanks for your post and welcome to our forum!

The figures detailing the response of the digital filter can scaled for different CLK input frequencies and data rates. For example, Figure 45 shows the frequency response from DC to CLK / 2 (one-half the modulator sampling rate) and Figure 48 shows the same response extended to 3 x CLK. For a 10-MHz CLK, the digital filter will reach -3 dB at 307.5 Hz.

Best Regards,

0 Howard Tetrault over 7 years ago in reply to Ryan Andrews

Prodigy 20 points

Thanks Ryan,

I know the figure can be re-scaled. The problem is there is not enough detail on the rolloff from 3dB to -60dB. I can only estimate the frequency scale and would like an exact frequency/attenuation curve for this region.

0 Ryan Andrews over 7 years ago in reply to Howard Tetrault

TI__Guru 65386 points

Ah, ok. Let me see if I can find the source of the plot curve.

Regards,

0 Ryan Andrews over 7 years ago in reply to Ryan Andrews

TI__Guru 65386 points

Hello Howard,

I was able to find the source of the frequency response plots. Please see the figure below. The Frequency vs. Magnitude points are also provided in the attached Excel file for your convenience.

ADS1601_freq_resp_CLK=10MHz.xlsx

Best Regards,

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ADS1601: Internal Antialias Filter Response of Converter