GA1086MC1000 Просмотр технического описания (PDF) - TriQuint Semiconductor

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GA1086MC1000

11-Output Clock Buffer

TriQuint Semiconductor 

GA1086

Parallel Termination of Outputs

The GA1086 can be terminated either in parallel or in

series. If power dissipation is not of primary concern,

then parallel termination can be the most effective

mode of termination for the GA1086. An example of

this termination is shown in Figure 7, along with the

waveforms at an output pin and at the load. Note that

the Thevenin equivalent using two resistors and +5 V

supply can replace the 65 ohms to 1.5 V.

Unused outputs must be terminated.

Figure 7. Parallel Termination

ROUT A

ZO

VOUT

B

R IN

t AB

RT

Series Termination of Outputs

The alternative to parallel termination is series

termination. For applications where overshoots and

undershoots of the clock signal are a concern, it is best

to use balanced termination as shown in Figure 8. This

could, however, slow the rise time of the pulses

arriving at the destination.

Figure 8. Balanced Termination

65 Ω

52 Ω

FBIN

13 Ω

FBOUT

13 Ω

Q

CLK

GA1086

52 Ω

Qt0

65 Ω

Qt1

30 pF

Qt0

1.4 ns (max)

Qt1

1.8 ns (typ)

For additional information and latest specifications, see our website: www.triquint.com

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