~ National ~ Semiconductor - Al Kossow's Bitsavers

Typical Applications (Continued)
DATA
DELAY
Rl
150
I 2
I
L_-*iI--1
GNO
R5
150
5.
CONNECT TO
DP8341
+INJ
RECEIVER
-IN
6
Note 1: Resistance values afe in n, ±5%, YI.W.
(ft
gOg COAX
(RG62AfU)
3
R6
120
Note 2: Tl is a 1:1:1 pulse transformer, LMIN = 500 f'H for 18 MHz system clock.
Pulse Engineering Pari No. 5762,
Valor Electronics Pari No. CT1501
T echnitrol Pari No. 11 LHA or equivalentlransformers.
FIGURE 16. Interface Logic for a Coax Transmission Line
TL/F/5237-18
TLlF/5237-19
'To maintain loss at 95% of ideal signal, select
transformer inductance such that:
10,000
4MIN) = fOLK
Example:
fOLK = System Clock
Frequency
(e.g., 18.87 MHz)
Note 1: Less Inductance will cause greater amplitude
attenuation.
Note 2: Greater inductance may decrease signal rise
time slightly and incease ringing, but these effects are
generally negligible.
TL/Ff5237-20
L=~- L(MIN) = 530 H
18.87 X 106 f'
FIGURE 17. Transformer Selection
2-43