Can I Disable Decimation Filter in KM34

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Can I Disable Decimation Filter in KM34

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martinzhang
Contributor III

Hi,

I’m using AFE of KM34, I noted that the decimation filters will affect the ADC frequency response, my quest is: Can I disable the decimation filter to improve the ADC frequency response?
I tried to disable the decimation filters but the AFE cannot work correctly?

Best Regards,

Martin

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3 Replies

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Omar_Anguiano
NXP TechSupport
NXP TechSupport

Hello Martin Zhang

 

You can disable the Decimation filter with the field AFE_CHx_CFR(DEC_EN).

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Let me know if this is helpful, if you have more questions do not hesitate to ask me.

Best regards,

Omar

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martinzhang
Contributor III

Hello Omar,

Thank for your reply!

I have tried to disable the Decimation filter again, set the flag DEC_EN to 0 in AFE_CHx_CFR, but the MCU never enter the AFE interrupt. I change back DEC_EN to 1 and the AFE work correctly.

Is there any other related setting to disable decimation filter and keep AFE works correctly?

Best Regards,
Martin

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Omar_Anguiano
NXP TechSupport
NXP TechSupport

Hello Martin Zhang

 

I consulted this with an internal team. Unfortunately, the Decimation filter must be enabled. If it is not enabled the AFE won't work correctly.

 

I apologize for the inconvenience this may cause you. If you have more questions do not hesitate to ask me.

Best regards,

Omar

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