SGTL5000 anti-alias filter?

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SGTL5000 anti-alias filter?

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caballero_hyoga
Contributor I

Does SGTL5000 chip have a low-pass anti-alias filter? I have been researching about it for a while and neither in the documentation nor anywhere else I have found any reference of it. Nevertheless, reading this forum thread it seems there may be an anti-alias filter in the chip circuit. Could anyone confirm whether is there such filter or not? And, if there is, is it possible to disable it with programming?

Thank you.

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2 Replies

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Michael

seems yes, it is described as ADC_HPF_BYPASS in register CHIP_ADCDAC_CTRL.

SGTL5000, Low Power Stereo Codec with Headphone Amp - Data Sheet

Best regards
igor
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caballero_hyoga
Contributor I

Hi Igor. That one is to bypass a high-pass filter (attenuate low frequencies). Anti-aliasing filters are low-pass filters. In the datasheet doesn't seem to be any parameter to configure or disable a ADC low-pass filter. So I guess that if it is present in the circuit, it is not possible to disable it.

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