PCM1803A: Detail of HPF frequency response

Koyo Asaishi

Intellectual 1980 points

Part Number: PCM1803A

Hi team,

The datasheet of PCM1803A have HPF which cutoff frequency is 0.019*fs.
Do you have detail information such that graph, schematic or anything?

Gain and phase at low frequency is important for our project.

Best regards,
Koyo

over 4 years ago

0 Collin Wells over 4 years ago

TI__Guru 63965 points

Hello Koyo,

The HPF gain response is located in the performance curve section of the datasheet.

0 Koyo Asaishi over 4 years ago in reply to Collin Wells

TI__Intellectual 1980 points

Hi Collin,

The picture shows the cutoff frequency is 0.454*fs but I want to know this kind of graph about 0.019*fs.

Or could you explain what is "HPF frequency response" at page 6 of the datasheet?

Best regards,
koyo

0 Collin Wells over 4 years ago in reply to Koyo Asaishi

TI__Guru 63965 points

Hi Koyo,

I attached an image to the previous post, it definitely shows the low-frequency high-pass filter response, not the low-pass response. Please review figures 5 and 6 in the datasheet.

0 Koyo Asaishi over 4 years ago in reply to Collin Wells

TI__Intellectual 1980 points

Hi Collin

OK, thanks.

Is this 2nd order IIR HPF (Butterworth) filter?

Best regards,
koyo

+1 Collin Wells over 4 years ago in reply to Koyo Asaishi

TI__Guru 63965 points

Hi Koyo,

It's a 2nd order IIR and looks to have a butterworth response type.

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PCM1803A: Detail of HPF frequency response