Analog Output Impedance ???

[Yellow Pitaya]

Hello,
Does anybody know the output impedance's value of the Analog outputs (AO0 - AO3) from the extension connector
Thanks !
YP

[jeanminet]

Hi,

The characteristics of the analog outputs are defined in the file red-pitaya.xdc:
https://github.com/RedPitaya/RedPitaya/ ... a.xdc#L111

Voltage is 1.8 V and drive current is 12 mA.
If I'm not missing something, that means an output impedance of 1.8/0.012 = 150 Ohms.

[Nils Roos]

Voltage is 1.8 V and drive current is 12 mA.
If I'm not missing something, that means an output impedance of 1.8/0.012 = 150 Ohms.

Well, you're missing the external passive low pass filter, which is not documented in detail.

[redpitaya]

Hi guys,

In the attachment is the output impedance of fast analog outputs:

Best, RP

[Nils Roos]

Sadly, adding attachments here has been "kaputt" for a couple of months.

[redpitaya]

Hi,

It looks like they are broken.
We will check this.

Best, RP

[Nils Roos]

So, while you are looking into repairing attachments, could you please upload the schematic somewhere and post a link ? Or publish it eg. on the redpitaya.com faqs page ?

[redpitaya]

Hi

ah, sure.
This link should work:
https://dl.dropboxusercontent.com/s/ffu ... edance.png

We will put it on FAQ also.

Best,

[Nils Roos]

Hey, you fixed attachments, great

The fast analog output impedance is also really helpful, but the original question was for the auxiliary analog outputs.

[redpitaya]

Thanks Nils, I have miss that.
Here is the output impedance for AO0-AO3.

Best