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DAC38J82: DAC38J82 SPI rates

Ilya Michlin
Prodigy 120 points
Part Number: DAC38J82


Im trying to measure wakeup times on the DAC38J82EVM based on the thread: https://e2e.ti.com/support/data_converters/high_speed_data_converters/f/68/p/578820/2162323#2162323

When I measure the SPI's SCLK pin, I see that it sends 24 pulses but it takes 40uSec instead of 2.4uSec as in the thread.

How can I change the SPI's speed?

  • 0
    TI__Guru* 91947 points

    Ilya,

    The speed is limited by the software driver. You would have to use another source (FPGA, microcontroller, ect...) to drive the SPI interface if you would like to operate the interface at a faster rate. The EVM does have a connector (J24) that would allow the user to bring in external SPI control signals. You would have to reprogram U1 though to get these signals to the DAC. If needed, we can provide the original source code for this CPLD.

    Regards,

    Jim