5

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

Signal Detect

The C-1xx-1250AC-FDFB-SLCx transceivers are equipped with LVTTL signal detect output. The standard LVTTL output

eliminates the

need for a LVPECL to LVTTL level shifter in most applications.

Power Coupling

A suggested layout for power and ground connections is given in figure 3A below. Connections are made via separate voltage and

ground planes. The mounting posts are at case ground and should not be connected to circuit ground. The mounting posts are at case ground

and should not be connected to circuit ground. The ferrite bead should provide a real impedance of 50 to 100 ohms at 100 to 1000 MHz. Bypass

capacitors should be placed as close to the 10-pin connector as possible.

R=N.C

R1

Figure 2: Signal Detect

VALUES:

C1, C2 = 1000pF,

C3, = 0.1 uF

C4, = 10 uF,

L1, L2 = Real impednce of 50 to

100 Ohms to 1000 MHz.

L1

C3

C4

C1

C2

Vcc

L2

Figure 3: Suggested Power Coupling-Electrical Schematic