1721I View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'1721I' PDF : 28 Pages View PDF
APPLICATIONS INFORMATION
5V
180Ω
LSTTL 270Ω
5V
DO NOT USE FOR LT1720/LT1721
LEVEL TRANSLATION. SEE TEXT
10KH/E
820Ω
(a) STANDARD TTL TO PECL TRANSLATOR
VCC
1/2 LT1720
R2
R1
R3
VCC
R1 R2 R3
10KH/E 5V OR 5.2V 510Ω 180Ω 750Ω
100K/E 4.5V 620Ω 180Ω 510Ω
LT1720/LT1721
(b) LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
VCC
3V
1/2 LT1720
R2
R1
R4
R3
VCC
R1 R2 R3 R4
10KH/E 5V OR 5.2V 300Ω 180Ω OMIT 560Ω
100K/E 4.5V 330Ω 180Ω 1500Ω 1000Ω
(c) 3V LT1720/LT1721 OUTPUT TO PECL TRANSLATOR
VCC
1/2 LT1720
R4
R1
R2 R3
VEE
(d) LT1720/LT1721 OUTPUT TO STANDARD ECL TRANSLATOR
ECL FAMILY VEE
10KH/E – 5.2V
100K/E – 4.5V
VCC R1 R2 R3 R4
5V 560Ω 270Ω 330Ω 1200Ω
3V 270Ω 510Ω 300Ω 330Ω
5V 680Ω 270Ω 300Ω 1500Ω
3V 330Ω 390Ω 270Ω 430Ω
1720/21 F05
Figure 5
11
Share Link: 
