Hi,
I'm looking at a simple capacitively coupled spdif driver using parallel 74hcu04s. In calculating the resistor values to get the correct ouput level and impedance is it worthwhile taking account of the 74hcu04 output imdedance - if so could someone suggest the value to use [can't find one on the relavent data sheets except a generic one from from Fairchild which suggests HC normal outputs are in the region of 40-50 ohms - http://www.fairchildsemi.com/an/AN/AN-393.pdf.]
Thanks.
I'm looking at a simple capacitively coupled spdif driver using parallel 74hcu04s. In calculating the resistor values to get the correct ouput level and impedance is it worthwhile taking account of the 74hcu04 output imdedance - if so could someone suggest the value to use [can't find one on the relavent data sheets except a generic one from from Fairchild which suggests HC normal outputs are in the region of 40-50 ohms - http://www.fairchildsemi.com/an/AN/AN-393.pdf.]
Thanks.