Hi! I am trying to select a DAC that will be connected to a filter circuit. I would prefer NOT to use an additional op amp to buffer the DAC output. The DAC output will be 0-5V. The first cell of the filter looks like this:
Now, looking at two different DACS (one 12bit and one 16bit, this is not really important to the question), I can only find the following about driving capabilities:
MCP4921: http://ww1.microchip.com/downloads/en/DeviceDoc/22248a.pdf
In this datasheet it says that all tests have been done with Rload = 5kOhm and output of 4.096V. I am having a hard time to understand exactly how to interpret Rload and what this means - as far as I can read, Rload means a (theoretical/equivalient) resistor from output to GND.
I understand this as "any Rload HIGHER than 5kOhm will be fine", is this correct?
DAC8830: https://www.ti.com/lit/ds/symlink/dac8830.pdf
This datasheet says:
"These DACs are capable of driving unbuffered loads of 60 kΩ".
Does this mean that anything LOWER than 60kOhm is not possible without additional buffering? And does this mean that this DAC is unsuitable for directly driving my filter?
Sorry if these questions are stupid...
Now, looking at two different DACS (one 12bit and one 16bit, this is not really important to the question), I can only find the following about driving capabilities:
MCP4921: http://ww1.microchip.com/downloads/en/DeviceDoc/22248a.pdf
In this datasheet it says that all tests have been done with Rload = 5kOhm and output of 4.096V. I am having a hard time to understand exactly how to interpret Rload and what this means - as far as I can read, Rload means a (theoretical/equivalient) resistor from output to GND.
I understand this as "any Rload HIGHER than 5kOhm will be fine", is this correct?
DAC8830: https://www.ti.com/lit/ds/symlink/dac8830.pdf
This datasheet says:
"These DACs are capable of driving unbuffered loads of 60 kΩ".
Does this mean that anything LOWER than 60kOhm is not possible without additional buffering? And does this mean that this DAC is unsuitable for directly driving my filter?
Sorry if these questions are stupid...