CA16B2CAA 데이터 시트보기 (PDF) - Agere -> LSI Corporation
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CA16B2CAA
Agere -> LSI Corporation
CA16B2CAA Datasheet PDF : 30 Pages
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CA16-Type 2.5 Gbits/s DWDM Transponder with
16-Channel 155 Mbits/s Multiplexer/Demultiplexer
Advance Data Sheet
March 2001
Functional Description (continued)
Transponder Interfacing (continued)
TxREFCLKP/N
The TXREFCLK input is different than the other inputs to
the transmitter because it is internally terminated, ac-
coupled, and self-biased. Therefore, it must be treated
differently than the TXD and PICLK inputs. Differentially,
the input impedance at this input is 100 Ω, but due to
the way it is biased internally, when driven single-
ended, the impedance appears as 60 Ω. The proper
termination scheme for the TXREFCLK input is shown in
Figure 4.
LVPECL
SONET/SDH
INTERFACE
IC
(VCC = 3.3 V)
TXREFCLKP
TXREFCLKN
50 Ω TRANSMISSION LINES
CA16 TRANSPONDER
MULTIPLEXER
PLL
CLOCK
SYNTHESIZER
LVPECL
SONET/SDH
INTERFACE
IC
(VCC = 3.3 V)
DIFFERENTIAL INTERFACE
TXREFCLKP
TXREFCLKN
0.1 µF
50 Ω TRANSMISSION LINES
CA16 TRANSPONDER
MULTIPLEXER
PLL
CLOCK
SYNTHESIZER
FOR A SINGLE-ENDED INPUT,
THE INPUT IMPEDANCE IS
EQUIVALENT TO 60 Ω.
SINGLE-ENDED INTERFACE
Figure 4. Interfacing to the TxRefClk Input
1-1084 (F).c
144
Agere Systems Inc.
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