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Old 19th January 2006, 04:10 PM   #1
ble0t is offline ble0t  United States
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Default 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!
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Old 19th January 2006, 04:17 PM   #2
poobah is offline poobah  United States
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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.

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Old 19th January 2006, 04:35 PM   #3
ble0t is offline ble0t  United States
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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.
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Old 19th January 2006, 05:19 PM   #4
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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.

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Old 19th January 2006, 05:45 PM   #5
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Thanks much
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