1720 Просмотр технического описания (PDF) - Linear Technology

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1720

Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs

Linear Technology 

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

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