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ADS7953: SPI Interface will only run up to 8MHz. Would like to see 16MHz

May 24, 2019, 10:56 am

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Part Number:ADS7953

Having trouble driving the SPI interface with SCLK at 16MHz. everything works fine at 8MHz. But our company wanted to improve performance. I cannot read data from it at 16MHz. I noticed that the SDO output seems to be in a tri-state level sometimes. So I added first a 10K pull-up on the SDO which is attached to the 5VDC which also supplies both the VA and VBD. This got rid of a slow rise time for the SDO after all the 16 channels were scanned. But I noticed there is still a curve after each individual channel has finished its read sequence. So I switched the 10K out with a 2.2K. This improved things a little as far as how the waveform looks, but I still cannot read the data.

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