ADS8332EVMV2-PDK: wrong sampling rate at the eval board GUI GUI

Roee Kimchi

Part Number: ADS8332EVMV2-PDK
Other Parts Discussed in Thread: ADS8332

Hi,

I tried to use the evaluation board of ADS8332 to see the performance, and I saw something that I didn't fully understand.

I injected the following sine wave to the evaluation board:

around 2.5V peak to peak, 1 KHz sine wave (attached a screenshot from the scope).

I configured the GUI to 300KSPS.

the second attached picture is the 1KHz signal that we can see at the GUI:

I was expecting to see around 300 samples per single period of the sine wave, but I see around 40 samples.

also, when I change the sample rate at the GUI, it doesn't really affecting the signal that I see at the GUI.

would you please advise?

thank you very much!

9 months ago

Alexander Smith 9 months ago

TI__Mastermind 49941 points

Hi,

Please allow us some time to respond as many of our engineers are out for the holidays. Thank you.

Ryan Andrews 9 months ago

TI__Guru 61826 points

Hi Roee,

Happy New Year! Thanks for your patience while we were out of office.

The ADS8332 is an 8-channel device. When all channels are enabled for Auto-Sequence Mode, the sampling rate of the ADC core remains at 300kSPS, but the effective throughput per channel is reduced by a factor 8. Therefore, Channel 2 in your data capture is sampling the 1kHz sine wave at 37.5kSPS, resulting in 37.5 samples per period.

You can get the full 300-kHz bandwidth of the ADC by disabling the unused channels.

Best regards,

Ryan

Roee Kimchi 9 months ago in reply to Ryan Andrews

Prodigy 120 points

Hi Ryan, happy new year!

thank you, that resolved my issue.

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ADS8332EVMV2-PDK: wrong sampling rate at the eval board GUI GUI