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DAC7565 Enable line usage

David Duxstad
Prodigy 10 points
Other Parts Discussed in Thread: DAC7565

We are still in the design phase. We are using the DAC7565 with common SCLK and DIN among 5 devices. We have 5 individual sync lines, 1 per device. We currently have the Enable pin tied to ground, essentially using the Sync line as a chip select. Are there any disadvantages(performance degradations) to this method vs routing an additional 5 enable lines ( 1 per device )? The digital feed-thru spec mentions the SYNC line but not the enable line. Timing requirement T11 prevents us from tying sync and enable together.

  • 0
    TI__Expert 6915 points

    HI David,

    Looking at the set up (Five DAC7565's with Enable always on) it doesn't look there would be any degradation.
    It sounds like you are basically doing simultaneous conversions. The only draw back noticed is the power consumption.

     

  • 0
    TI__Guru**** 180941 points

    Hi David,

    The ENABLE pin on the DAC7565 essentially is the chip select input, while it is high, the DAC7576 ignores DIN and SCLK.  If the ENA on your five devices is held low and the SCLK + DIN is shared, you need to be careful about keeping the SYNC lines quiet.  If SYNC on one or more of the devices you are not intending to communicate with glitches, you could corrupt that DAC output.  If you have the available I/O lines, you should consider adding distinct enables.