Overview

The Gennum® GN2405A is a quad repeater/re-timer device designed to enhance the reach and robustness of high speed serial links by compensating for transmission losses and re-setting the crosstalk and jitter budget.

The GN2405A features Gennum's proven reference-free CDR architecture which simplifies system design and reduces overall cost. Each channel supports independent locking to data rates from 9.95 - 11.3Gbps. To enable backward compatibility with legacy data rates, half rate (5Gbps) and quarter rate (2.5Gbps) operation is also supported. Other rates can be supported using the re-timer bypass feature.

The GN2405A can be used in multiple applications. It can be used as a CDR in parallel optical modules or in active copper cable assemblies. It’s flexible de-emphasis driver and jitter performance are ideal for use as a line card or backplane repeater.

Packaging

48-pin QFN

Order Codes

GN2405A-INE3

PB Free/ROHS

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Features

Automatic locking from 9.95Gbps to 11.3Gbps
Automatic rate detect for quarter rate (2.5Gbps) and half rate (5Gbps) modes
Re-timer bypass up to 11.3Gbps
Low output jitter
High input jitter tolerance, better than 0.7 UI
No reference clock required
Programmable output, with 400mV to 800mV differential output voltage range
Independent channel operation
De-emphasis to compensate up to 28dB of loss
I²C control interface
Automatically loads configuration data from E²PROM
Loss of signal detect with adjustable threshold
Low power dissipation
Single 3.3V supply
7x7mm, 48-pin QFN package
GN2405A and GN2406 are fully pin compatible

Applications

Optical modules and active copper cable assemblies for:
- Infiniband® SDR/DDR/QDR
- 40Gbps and 100Gbps Ethernet
Re-timer on line card for:
- QSFP modules
- Parallel optical modules
- SFP+ modules
10Gbps serial backplane retimer