ADS8664: Digital output logic level

Hello Ryo,

Can you please let me know which Io value you are interested in also if there is a special reason you care it? I do think this 500uA is max current the digital ouput pin can drive also I do not think we have a curve between Vol-Iol, but I would like to check with team after getting your information. Also, are you referring the loading resistor?

Thanks&regards,

Dale

Hello Dale,

Thank you for your reply.

I would like to know whether resistor value between Lower n-channel and ground is constant or not. To know this, Vol-Iol curve is needed.

If this resistor value is constant, Vol is determined by Iol. So I can expect Vol value roughly.

I would appreciate if you would give me comment.

Thanks and best regards,

Ryo Akashi

Hello Ryo,

Before check with team, I would like to confirm with you about the circuit you showed here, this is not the circuit for this ADS8664 device, right? where (or which device) did you get this circuit? thanks.

Regards,

Dale

Hello Dale,

Sorry for my poor explanation.

This picture is from TI's logic app note.

The output which we are discussing about is DIGITAL OUTPUTS (CMOS).

Maybe it's not exact same, but it's same architecture basically. So I pasted that picture.

Thanks and best regards,

Ryo Akashi

Hello Ryo,

No problem. I have confirmed with our design team, "Yes, the resistance will be fixed for a given AVDD and IO supply, it can be modeled as a fixed resistance, so you can calculate VOL level for the sink current in your system".

Thanks.

Regards,

Dale

Hello Dale,

Thank you very much for your reply.

I understand that I can calculate Vol level for the sink current.

Do you have Vol-Iol curve data?

If possible could you share me?

Thanks and best regards,

Ryo Akashi

Hello Ryo,

As a fixed resistance, the resistance can be modeled and you will be able to calculate VOL for a given sink current. Also, the characterization data can not be shared after confirmed. Thanks for understanding.

Best regards,

Dale