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C-129-2500-FDFB-SLC4

更新时间： 2024-02-07 13:23:20

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2.5 Gbps Single Mode SFF LC Transceiver

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2.5 Gbps Single Mode SFF LC Transceiver

C-1XX-2500(C)-FDFB-SLCX

Recommended Circuit Schematic

Inputs to the C-1XX-2500(C)-FDFB-SLCX series transmitters are AC coupled and internally terminated through 50 ohms to AC ground.

These transceivers can operate with LVPECL or CML logic levels. The input signal must have at least a 200 mV peak to (single ended) signal

swing. Output from the receiver section of the module is also AC coupled and is expected to drive into 50 ohm load. Different termination

strategies may be required depending on the particular Serializer / Deserializer chip set used.

The C-1XX-2500(C)-FDFB-SLCX series product family are designed with AC coupled data inputs and outputs to provide the following

advantages:

■ Close positioning of SERDES with respect to transceiver; allows for shorter line lengths and at gigabit speeds reduces EMI.

■ Minimum number of external components.

■ Internal termination reduces the potential for unterminated stubs which would otherwise increase jitter and reduce transmission

margin.

Figure 1 & Figure 2 illustrates the recommended transmit and receive data line trminations for SERDES with CML and LVPECL Inputs / Outputs

respectively.

TX_DIS

TTL logic level

TX_GND

TRANSMITTER

Z=50�

TD +

TD -

TX_D

DRIVER

Z=50�

ꢀ0

LASER

Vcc_TX

Vcc_RX

Serializer / De-Serializer

with CML lnputs/Outputs

See

Fig. 4A

See

Fig. 3

BIAS

Z=50�

RD -

RX_D

POST

AMP

Z=50�

RD +

RX_D

ꢀ

RX_GND

RECEIVER

Note ꢀ

Figure 1.Recommended TRANSMIT and RECEIVE Data Terminations for SERDES with CML I/Os.

Note 1. Consult SERDES manufacturer’s data sheet and application data for appropriate receiver input biasing network.

Some deserializer inputs are internally terminated and may not need external termination resistors.

20550 Nordhoff St. • Chatsworth, CA 91311 • tel: 818.773.9044 • fax: 818.576.9486

LUMINENTOIC.COM

LUMNDS851-Jul2005

rev. A.0

9F, No 81, Shui Lee Rd. • Hsinchu, Taiwan, R.O.C. • tel: 886.3.5169222 • fax: 886.3.5169213

1 2 345 6 7...10

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