Increased output current on AD5504 high voltage DAC

Hello,

On a board, I already made a system with 60V 50mA outputs. It has a little noise at the output.

MCU with internal 3.3V DAC  ->  DAC reconstruction Sallen-Key filter DAC ->  LTC6090 high voltage op amp as non inverting amplifier with gain

I am considering replacing with a AD5504 high voltage DAC.

The AD5504 datasheet says ± 1mA load current. Is there a recommended application note or circuit to get more current (about 50mA)? Do I just hook it to the input of LTC6090 built as a Sallen-Key LPF I need very low noise output and DAC reconstruction filtering.

Frank

Top Replies

    •  Analog Employees 
    Jul 9, 2021 +1 verified

    Hi

    You may use the AD5504 with the LT6090. I would suggest having a look at our error budget tool to get a noise figure for the duo.

    If you are happy with the noise figure, you may simply use the…

Parents
  • +1
    •  Analog Employees 
    on Jul 9, 2021 8:02 AM

    Hi

    You may use the AD5504 with the LT6090. I would suggest having a look at our error budget tool to get a noise figure for the duo.

    If you are happy with the noise figure, you may simply use the LT6090 as a buffer, and if not, use it as a filter, in which case you will need to consider the capacitive load stability for the DAC. Either case, make sure that the DAC comes on first before the buffer to mitigate the risk of damaging the device.

    Regards

    Suraj

Reply
  • +1
    •  Analog Employees 
    on Jul 9, 2021 8:02 AM

    Hi

    You may use the AD5504 with the LT6090. I would suggest having a look at our error budget tool to get a noise figure for the duo.

    If you are happy with the noise figure, you may simply use the LT6090 as a buffer, and if not, use it as a filter, in which case you will need to consider the capacitive load stability for the DAC. Either case, make sure that the DAC comes on first before the buffer to mitigate the risk of damaging the device.

    Regards

    Suraj

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