Differential Gain and Differential Phase errors measured at

the load are less than 1% and 1˚ respectively.

R

pensate for the line losses and for proper response at the

output. Values shown correspond to a twisted pair cable

length of 25 meters with about 3 turns/inch (see

Figure 5 for

step response).

The supply voltage can vary from 8.5V up to 30V with the

output rise and fall times under 12 ns. With the component

values shown, the overall gain from the input to the output is

about 1.

Even though the transmission line is not terminated in its

nominal characteristic impedance of about 600

Ω, the result-

ing reflection at the load is only about 5% of the total signal

and in most cases can be neglected. Using 75

Ω termination

instead, has the advantage of operating at a low impedance

and results in a higher realizable bandwidth and signal

fidelity.

DS012348-94

Note:

Pin numbers shown are for SO-8 package.

FIGURE 4. Single Supply Differential Twister Pair Cable Transmitter/Receiver

8.5V

≤ V

www.national.com

16