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DAC3484 In 2 Channel Mode - Register discrepancy in datasheet?

Brian Antheunisse
Expert 5305 points
Other Parts Discussed in Thread: DAC3484, DAC3482

Hi High Speed Data Converter team,

I have a question about the DAC3484. 

In the datasheet, it mentions that in 2 channel mode, you should reference the DAC3482 datasheet for details:

When referencing the DAC3482 datasheet, it states that when complementing the DACI and DACQ, bits 5 and 6 of config1 should be set. We have found this to be incorrect, and after some testing, flipping bits 6 and 7 instead have actually been shown to successfully control this complementing function. According to the datasheet however, bit 7 is supposed to be reserved:

Can you guys confirm? Also, if this is true, what is bit 5...reserved?

Thanks!

Brian Antheunisse

  • 0
    TI__Guru* 78164 points
    Brian,

    I will look into this.

    -Kang
  • 0
    TI__Guru* 78164 points

    Brian,

    I have confirmed the customer's finding and the next action is to correct the datasheet.

    Brief history:

    The DAC3482's I/Q path is operating on the same path of the DAC3484's digital channel A/B path. After the DAC3482's DSP path such as FIR and mixers, the final DAC digital data on I/Q path (or digital path AB) is send to the middle two DAC output core (DACI/DACQ or DAC_B/DAC_C of DAC3484 package). Since the complementing function is on the digital side, we should use bit 7 and bit 6 to complement the I/Q path (or A/B side)

    The register setting below is copied from the DAC3484 datasheet. You can see that the DAC3482's complementing function should be on bit 7 and bit 6 for path A and B DSP path complementing function. The original mistake on the DAC3482 datasheet is that the complementing function follows the analog core path of channel B/C output. This is a mistake and we will fix it. Our apologies. 

    -Kang

  • 0 in reply to Kang Hsia
    TI__Expert 5305 points

    Kang,

    Great! thanks for the speedy response.

    Any ETA on the updated datasheet? How long does that usually take to fix?

    Regards,

    Brian

  • 0 in reply to Brian Antheunisse
    TI__Guru* 78164 points
    Brian,

    datasheet update requires approval from the Quality team. The change will not be immediate and requires time. I do not have an ETA at this point.