Output Impedance?
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 19th January 2006, 05:10 PM #1 ble0t   diyAudio Member     Join Date: May 2004 Location: Milwaukee, WI Output Impedance? How would one calculate the output impedance of something like this: http://www.st.com/stonline/products/...73/74v1g70.pdf Do you need to average the high and low voltages both divided by the typical output current? Does that make any sense? Thanks! __________________ gravity always wins
 19th January 2006, 05:17 PM #2 poobah   diyAudio Member     Join Date: Nov 2005 You need to divide a change (difference) in output voltage by a corresponding change in output current. They didn't give you the data to do this. This is a logic device... probably not good for a linear application.
 19th January 2006, 05:35 PM #3 ble0t   diyAudio Member     Join Date: May 2004 Location: Milwaukee, WI It's not for a linear application persay. It's for buffering a digital output signal (more specifically SPDIF). I want to match an impedance for the primary side of a transformer. I can't get the output impedance of the transmitter I'm using, so I thought buffering it and using that output impedance would be the best idea. __________________ gravity always wins
 19th January 2006, 06:19 PM #4 poobah   diyAudio Member     Join Date: Nov 2005 HMMM... 25 Ohms might be a good guess for CMOS. I have calculated Zo for these device before. Also look for "differential line (or bus) driver". They won't be lacking in spec's.
 19th January 2006, 06:45 PM #5 ble0t   diyAudio Member     Join Date: May 2004 Location: Milwaukee, WI Thanks much __________________ gravity always wins

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