Datasheet

LT1720/LT1721
12
17201fc
APPLICATIONS INFORMATION
Figure 5
5V
5V
180Ω
270Ω
820Ω
10KH/E
R2
V
CC
R3
R1
10KH/E
100K/E
V
CC
5V OR 5.2V
4.5V
R1
510Ω
620Ω
R2
180Ω
180Ω
R3
750Ω
510Ω
(a) STANDARD TTL TO PECL TRANSLATOR
(b) LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
LSTTL
1/2 LT1720
R2
V
CC
3V
R3R4
R1
10KH/E
100K/E
V
CC
5V OR 5.2V
4.5V
R1
300Ω
330Ω
R2
180Ω
180Ω
R3
OMIT
1500Ω
(c) 3V LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
1/2 LT1720
R4
560Ω
1000Ω
R4
V
EE
V
CC
R3
17201 F05
R2
R1
ECL FAMILY
10KH/E
V
EE
–5.2V
R1
560Ω
270Ω
V
CC
5V
3V
R2
270Ω
510Ω
R3
330Ω
300Ω
(d) LT1720/LT1721 OUTPUT TO STANDARD ECL TRANSLATOR
1/2 LT1720
R4
1200Ω
330Ω
100K/E –4.5V
680Ω
330Ω
5V
3V
270Ω
390Ω
300Ω
270Ω
1500Ω
430Ω
DO NOT USE FOR LT1720/LT1721
LEVEL TRANSLATION. SEE TEXT