Does the DAC AD5755-1 support mA output in Sink mode? or what would be the equivalent part which supports sink mode output?
Hi Sabapathy K,
The AD5755-1 does not have current sinking capability. A discrete circuitry should be added. I don’t have a design at hand but it would likely take a large amount of area for 4 channels. You may want to look at the AD5750 for single channel option. However, please note that the AD5750 needs an analog input so you will need a quad channel DAC for four channels of your application. I would recommend the AD5064 for the input requirement of the AD5750. A sample system configuration for the AD5750 is shown below.
My understanding to your first question is if the AD5755-1 can sink current while using the current output mode. If so, the AD5755-1 have three ranges when using the current output mode.
That being said, the AD5755-1 can only source current given that the output current are all positive. May I ask how do you want to use the DAC? Knowing how you would use it would give us better perspective and let us advice you with appropriate recommendation for your DAC needs.
Thanks for the quick response.
for your better understanding, I have put a drawing below.
In source mode as you said, it is the AD5755-1 which generates source current to the far end device and transmit over the current loop.
In case of sink mode, the far end device just supplies the voltage and AD5755-1 has to convert it to controlled current as per the user setting thereby controlling the loop current locally by AD5755-1 over the defined voltage range it receives.
The DAC will be used in a mA output module which will be used as an mA repeater. The output shall be used for monitoring or in plotter to check mA trend graph. The module shall be used in either sink or source setting depending on the customer requirement.
I would also highly appreciate if you can give suggestions on the above configuration that can be achieved through any other configuration ideas or different devices from analog device
Thank you very much Mark for the information.
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