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dac7563 using LDAC signal

Oscar Gomez Fuente
Expert 2060 points
Other Parts Discussed in Thread: DAC7563

Hi,

In my design, I've got three dac7563, six DACs in total, and I would like to update every analog output signal at the same time.

I think I could do this using a signal by a falling edge to activate the three LDAC pins. These are the steps followed in the three DACs dac7563:

1º.- Reset all registers and update all DACs: 0x38 0x00 0x00

2º.- LDAC pin active for DAC-A and DAC-B: 0x30 0x00 0x00

3º.- Write Input Reg Dac-A: 0x00 0xvalue_MSB 0xvalue_LSB

4º.- Write Input Reg Dac-B: 0x01 0xvalue_MSB 0xvalue_LSB

5º.- Active the line LDAC with falling edge. 

But the values are updated in the steps 3 and 4.

Could anyone help me?

Thank you so much. Best regards.

NOTE: nCLR is floating.

LDAC pin active for DAC-A and DAC-B

  • 0
    TI__Genius 10615 points

    Hi Oscar,

    Oscar Gomez Fuente said:
    NOTE: nCLR is floating.

    \CLR must be tied to a definite voltage. Otherwise the device might clear it's setting at any time during operation.

    Oscar Gomez Fuente said:
    1º.- Reset all registers and update all DACs: 0x38 0x00 0x00

    The code for this should be 0x28 0x00 0x00. The code you are using right now is disabling the internal reference.

    The rest of the codes are correct, although the LDAC activate is not required. It the default when you power on the device.

    Oscar Gomez Fuente said:
    I think I could do this using a signal by a falling edge to activate the three LDAC pins.

    This is correct. Do you have LDAC HIGH throughout the entire write sequence?