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GHDD4414

10-Gbps GaAs Family High-Speed Optical Communications System

Oki Electric Industry 

KGL4201

10-GHz 8:1 Multiplexer

GENERAL DESCRIPTION

Oki’s KGL4201 is a 10-GHz 8:1 multiplexer designed to operate in 10-Gbps communication links. This

circuit synchronously merges eight 1.25-Gbps data streams, clocked at low frequency rates into a single

10-Gbps stream, clocked at the higher frequency. In the KGL4201 multiplexer, the 10-GHz master clock is

first divided by two, then by four. The lower frequency components are first multiplexed by four, then

the two groups are merged into a single data stream using the master 10-Gbps clock. Complementary

1/8 synchronous clock outputs are made available from the KGL4201 for use in synchronizing lower fre-

quency logic.

All signal interfaces are 50-Ω with direct DC coupling on the 1.25-Gbps data inputs and phase-locked

1.25-Gbps clock outputs. The 10-Gbps data output and 10-GHz clock input are AC-capacitively-coupled

for ease of interfacing at microwave speeds and reducing ground noise induced phase jitter. All package

clock and data pins are separated by either ground or supply voltage pins to control the I/O impedance,

maintain signal isolation and reduce phase noise.

The KGL4201 is shipped in a 40-pin ceramic flat-package with impedance-controlling ground plane and

flush mounting bottom heat sink.

FEATURES

• AC-coupled 10 Gbps I/O: eliminates DC

coupled phase jitter

• 1/8 clock generated on chip: easy to

synchronize downstream logic

• 2 V, 2.4 W

• Isolated I/O pins: minimize noise and

impedance variation

• Packaged in 40-pin ceramic flat-package with

ground plane and heat sink.

Oki Semiconductor

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