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ADS1255: SPI connection for multiple devices

Part Number: ADS1255

Hi,

Please let me know about the SPI specifications.

The customer plans to bus-connect the SPI I/F of five devices.
The data rate is about 1.4Mbps, is there any problem?

Customers are concerned about waveform distortion due to input capacitance.
Do you know the value of the input capacitance?

and
I believe all SPI pins have ESD protection. Is this correct?

Best regards,
Hiroshi