4

1.25 Gbps Single Mode SFF LC Transceiver

C-1xx-1250AC-FDFB-SLCx

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

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

LUMNDS772-Mar0308

Rev A.1

LUMINENTOIC.COM

Recommended Circuit Schematic

The split-loaded terminations for ECL signals need to be located at the input of devices receiving those ECL signals.

The power supply filtering is required for good EMI performance. Use short tracks from the inductor L1/L2 to the module Rx Vcc and Tx Vcc.

A GND plane under the module is required for good EMI and sensitivity performance.

TTL logic level

Fig. 3

2

Vcc_RX

POST

AMP

RECEIVER

PIN

BIAS

AMP

TZ

RX_GND

1

RX_D

5

RX_D

4

3

SD

See

Fig. 2

DRIVER

TRANSMITTER

LASER

7

TX_GND

Vcc_TX 6

TX_D 10

See

TX_D 9

TX_DIS

8

Serializer / De-Serializer

with LV PECL lnputs/Outputs

130

Ω

130

Ω

Vcc= +3.3V

82

Ω

Z=50�

Z=50�

82

Ω

RD +

RD -

Note 1

Z=50�

Z=50�

TD -

TD +

Figure 1: Recommended Transceiver and Receive Data Terminations