Board

Supply

Chip

Supply

C

10 F

m

C

1 F

m

C

0.1 F(x6)

m

FerriteBead

V

CC

(a) Output DC Termination

(b) Output AC Termination

CDCLVP2108

LVPECL

86 W

86 W

50 W

50 W

V

BB

CDCLVP2108

LVPECL

250 W

62.5 W

250 W

62.5 W

V

CC

V

CC

CDCLVP2108

www.ti.com

SCAS878B

– MAY 2009 – REVISED AUGUST 2011

Figure 13 illustrates this recommended power-supply decoupling method.

Figure 13. Power-Supply Decoupling

LVPECL Output Termination

The CDCLVP2108 is an open emitter for LVPECL outputs. Therefore, proper biasing and termination are

required to ensure correct operation of the device and to minimize signal integrity. The proper termination for

LVPECL outputs is a 50

Thevenin equivalent circuit is worked out for the LVPECL termination in both direct-coupled (dc) and ac-coupled

= 3.3 V, respectively. It is recommended to place all resistive components close to either the driver end or the

receiver end. If the supply voltage for the driver and receiver is different, ac coupling is required.

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© 2009–2011, Texas Instruments Incorporated

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Product Folder Link(s): CDCLVP2108