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Original question:

DAC80508: Read the Device ID

DAC80508: No output on DAC channels

Chandra Sekhar N
Intellectual 880 points
Part Number: DAC80508
Other Parts Discussed in Thread: USB2ANY

Ref : https://e2e.ti.com/support/data-converters/f/73/t/890391

Dear AK,

In continuation with the above thread, I have replaced a new DAC chip, and still the output not being observed.

I have tried with both the internal and external reference voltage options.

As you mentioned in the last message, I have checked the status register. The value is FF. That is Alarm is set.

I have verified that the Gain = 1 (BUFF-GAIN = 1, REF-DIV = 1).

Still the current drawn by the chip is 300 mA, which means the output stage is not enabled.

I am not sure what I can check further. Do you have any option alternate to USB2ANY ( I do not have one) to check with the example?

I do not find the Labview vi sketch being shared with the example package. Can you please share the vi project of the example so that I can verify the sequence being executed?

This will give some idea to me.

Chandra

 

  • 0
    TI__Mastermind 19086 points

    Hi,

    Alarm bit set means, it has to do BUF_GAIN and REF_DIV setting. Since your supply is 3.3V, and internal reference is 2.5V, you need to do the following setting.

    BUF_GAIN = 2, and REF_DIV  = 2, so that output voltage will be 0 to Vref. Corresponding bits will be 1. 

    First write these registers before you enable internal reference (Important !!)

    Status register reading 1 means,  the difference between VREF/DIV and VDD is below the required minimum analog threshold

    Let me know after reading the above steps, power up the device and write registers for REF_DIV and BUF_GAIN , enable device outputs and enable reference.

    Regards,

    AK