Hello!
First post here, surely not the last.
I was wondering if anyone had experience driving an op amp using a Digital to analog converter that is on an isolated ground from the op amp?
See the schematic below.
My device takes in 48V DC, uses an isolated DC/DC converter to bring it down to 12VDC then again dropped to 5VDC. (I am using a PYBE20-Q48-S12 as the main DC/DC converter)
As shown above, the Op Amp is using the 48VDC input as its supply(VOLTAGE_IN), and as a result is tied to the 48V's ground(DGND_48V); while the DAC is powered via 5VDC it receives from a linear regulator connected to the the isolated DC/DC 12V output, so it is tied to the isolated ground at the output of the DC/DC. (DGND)
I'm afraid that if there are any offsets between the two isolated grounds, the device will have issues with precision. Would this be the case?
Is there anything I can do to make sure there is a static offset, or no offset at all?
Thanks,
JM
First post here, surely not the last.
I was wondering if anyone had experience driving an op amp using a Digital to analog converter that is on an isolated ground from the op amp?
See the schematic below.
My device takes in 48V DC, uses an isolated DC/DC converter to bring it down to 12VDC then again dropped to 5VDC. (I am using a PYBE20-Q48-S12 as the main DC/DC converter)
As shown above, the Op Amp is using the 48VDC input as its supply(VOLTAGE_IN), and as a result is tied to the 48V's ground(DGND_48V); while the DAC is powered via 5VDC it receives from a linear regulator connected to the the isolated DC/DC 12V output, so it is tied to the isolated ground at the output of the DC/DC. (DGND)
I'm afraid that if there are any offsets between the two isolated grounds, the device will have issues with precision. Would this be the case?
Is there anything I can do to make sure there is a static offset, or no offset at all?
Thanks,
JM