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©2017 Integrated Device Technology, Inc.

August 23, 2017

ICS853S012I Datasheet

Termination for 2.5V LVPECL Outputs

Figure 5A

and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50

 to

VCC – 2V. For VCC = 2.5V, the VCC – 2V is very close to ground level. The R3 in Figure 5B can be eliminated and the termination is shown

in Figure 5C.

Figure 5A. 2.5V LVPECL Driver Termination Example

Figure 5B. 2.5V LVPECL Driver Termination Example

Figure 5C. 2.5V LVPECL Driver Termination Example

2.5V LVPECL Driver

VCC = 2.5V

2.5V

2.5V

50

Ω

50

Ω

R1

250

Ω

R3

250

Ω

R2

62.5

Ω

R4

62.5

Ω

+

–

2.5V LVPECL Driver

VCC = 2.5V

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

R3

18

Ω

+

–

2.5V LVPECL Driver

VCC = 2.5V

2.5V

50

Ω

50

Ω

R1

50

Ω

R2

50

Ω

+

–