ADC input with unexpected value

Hello Huib,

Could you please attach your project and hardware schematic?

We will have a look and get back to you.

Regards,

Harish

Attached the file and schematic for the volume. Vol_A is connected to the ADC_0 input of the DSP

DesignADAU1450.dspproj

Hello Huib,

Your project works fine with my Eval board. So, it should be something with your hardware connections.

The potentiometers on the Eval boards are 10K ohm.

The picture that you attached is not quite readable. Can you please attach a clear picture and mention that part's name?

Regards,

Harish

HI Harish,

First of all thank you for looking into this.

The part used is: https://www.digikey.com.au/en/products/detail/alps-alpine/RK09K1110A0J/19529183?s=N4IgTCBcDaIEoGkAMBOBBGTSCCSBSIAugL5A

If I measure on the on the ADC_0 input pin (pot full open) of the DSP I find 3.25V DC. AVDD is 3.32 Volt DC

This should translate into something around the 1000. Nothing over 1023 anyway. I get 1984 on the RAW reading of the DSP core.

Do I need to terminate the other ADC inputs? They are floating at the moment. ONly 0 and 1 are used at the moment

I have done the same setup on my ADUA1467 eval board (that I used to design my project) and that works fine.

Again thanks for your time.

Huib

First of all thank you for looking into this.

The part used is: https://www.digikey.com.au/en/products/detail/alps-alpine/RK09K1110A0J/19529183?s=N4IgTCBcDaIEoGkAMBOBBGTSCCSBSIAugL5A

If I measure on the on the ADC_0 input pin of the DSP I find 3.25V DC. AVDD is 3.32 Volt DC

This should translate into something around the 1000. Nothing over 1023 anyway. I get 1984 on the RAW reading of the DSP core.

Do I need to terminate the other ADC inputs? They are floating at the moment. Only ADC_0 and ADC_1 are used.

I have done the same setup on my ADUA1467 eval board (that I used to design my project) and that works fine.

Again thanks for your time.

Huib

First of all thank you for looking into this.

The part used is: https://www.digikey.com.au/en/products/detail/alps-alpine/RK09K1110A0J/19529183?s=N4IgTCBcDaIEoGkAMBOBBGTSCCSBSIAugL5A

If I measure on the on the ADC_0 input pin of the DSP I find 3.25V DC. AVDD is 3.32 Volt DC

This should translate into something around the 1000. Nothing over 1023 anyway. I get 1984 on the RAW reading of the DSP core.

Do I need to terminate the other ADC inputs? They are floating at the moment. Only ADC_0 and ADC_1 are used.

I have done the same setup on my ADUA1467 eval board (that I used to design my project) and that works fine.

Again thanks for your time.

Huib