How to measure the output impedance of the DAC chip

ergo · 9th June 2004, 05:40 AM

I'd like to know the output impedance of AK4393 DAC chip for correct filter and analog stage simulation.

It is a differential voltage output DAC.

How to measure this?

Also while at the subject what about current output DACs like PCM1704. How to determine their output impedance?

Regards,
Ergo

hjelm · 9th June 2004, 06:59 AM

Do you mean that you want the full Z(freq) impedance?

ergo · 9th June 2004, 07:07 AM

No, basicly I want the value of a resistor I should put in series with either a voltage or current source respectively in simulation...

I know that for an amp one could inject a sine wave of known voltage into the powered amps output through a known resistor and that way determine the output impedance.

I'm not sure if I can do it for DAC chip. Is it sure that I can't damage it? I do not know how they do the output circuit in component level inside the IC.

Ergo

9th June 2004, 05:40 AM	#1
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	How to measure the output impedance of the DAC chip I'd like to know the output impedance of AK4393 DAC chip for correct filter and analog stage simulation. It is a differential voltage output DAC. How to measure this? Also while at the subject what about current output DACs like PCM1704. How to determine their output impedance? Regards, Ergo

9th June 2004, 06:59 AM	#2
hjelm diyAudio Member Join Date: Nov 2003 Location: Västerås	Do you mean that you want the full Z(freq) impedance? __________________ Hjelm

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9th June 2004, 07:07 AM	#3
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	No, basicly I want the value of a resistor I should put in series with either a voltage or current source respectively in simulation... I know that for an amp one could inject a sine wave of known voltage into the powered amps output through a known resistor and that way determine the output impedance. I'm not sure if I can do it for DAC chip. Is it sure that I can't damage it? I do not know how they do the output circuit in component level inside the IC. Ergo

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