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ADS9120: SPI Protocols for Reading From the Device

HIDEHARU KONDO
Prodigy 150 points

Part Number: ADS9120

I'm using SPI-00-S protocol for reading from the ADS9120.
I can see "capture edge" is sclk rising on table 5,
but I can't see" sclk launch edge".

The ”sclk launch edge” on SPI-00-S protocol is falling?

It is important for understanding td_CKDO.

  • 0
    TI__Guru 51280 points

    Hello Hideharu,

    Yes, SCLK launch edge is the falling edge for SPI-00-S.

    Please refer to Figure 56 in the datasheet for details on the launch edge.  The MSB, D19, is launched on the falling edge of /CS.  The remaining data, D18..D0, are launched on the falling edge of SCLK.  This is shown in 'BLUE' in Figure 56.  You should capture data on the rising edge of SCLK, shown in 'RED'.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    Prodigy 150 points

    Hello Keith,

    Thank you for your detailed explanation.

    I've understood what you explain.

    Regards,

    Hideharu Kondo