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DAC11001B: LDAC

neal keane
Prodigy 30 points
Part Number: DAC11001B

There is a section in the DAC11001B datasheet that states:

7.5.3.2 Asynchronous Update In asynchronous mode (LDACMODE = 0), data are updated with the rising edge of the SYNC (when daisy-chain mode is enabled, DSDO = 0), or at the 32nd falling edge of SCLK (When daisy-chain mode is disabled, DSDO = 1). For asynchronous updates, the LDAC pin is not required, and must be connected to 0 V permanently.

If instead, the LDAC pin is connected to +3.3v permanently, how will this affect performance?  We are seeing significant sinusoidal temperature sensitivity across -40 to +80 degC while using this device.

  • 0
    TI__Mastermind 19086 points

    Hi,

    For asynchronous updates, /LDAC has to be connected to GND  not 3.3V.

    Regarding sinusoidal sensitivity with respect to temperature, do you mean amplitude or frequency? Amplitude sensitivity can be due to the external reference, buffer etc.

    Can you please share schematics to a.k@ti.com

    Regards,

    AK