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TAC5112: Output swing and ac coupling cap

Shinji Tsuji
Genius 12668 points
Part Number: TAC5112

Tool/software:

Hi team,

#1. When I configure DAC output channel as single end, the output is 1Vrms?

If I configure below DAC_CH1_FULLSCALE_VAL register to 1d, then the output will be 2Vrms?

#2. AC coupling cap is recommended as 47uF. Is there any concern if I use 100uF or 22uF?

regards,

  • 0
    TI__Intellectual 760 points

    Hi,

    Yes, when you configure the DAC output as single-ended for AVDD=3.3V, the output will be 1Vrms. 

    I am looking into configuring the DAC_CH1_FULLSCALE_VAL, I set the bit with I2C to the parameter that would give 2Vrms for single ended, but saw no change in the output. From the way it is written, it seems like it could be an error in the datasheet and the full scale value may only be changeable for the ADC. I will ask a designer about this feature to make sure and let you know what they say.

    Which capacitor are you looking at for the 47uF coupling capacitor? Let me know and I will get back to you.

    Best,
    Mir