Output impedance of uA9638C line driver?

Robert Trent

Prodigy 10 points

I can't see this value in the data sheet. Anyone know? Even a good estimation would help.

over 11 years ago

0 Elias Villegas M. over 11 years ago

TI__Guru* 76130 points

Moving to the correct forum.

0 Ron Michallick over 11 years ago

TI__Guru**** 165566 points

Robert,

I can provide an estimation.

VOL is at most 0.5V at 40mA, This is 12.5 ohms maximum. My guess is 7 to 8 ohms.

VOH is derated by 0.5V for a 30mA delta. This is 16.7 ohms. It must be at least 9.6 ohms because of the current sense resistor. My guess is 11 to 12 ohms.

Normally the source will not match the line impedance. The receiver should match the lime impedance to prevent reflections.

Interface

Interface forum

Output impedance of uA9638C line driver?