4.25 Gbps, 8 × 8,

Asynchronous Crosspoint Switch

ADN4600

Rev. 0

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FEATURES

Full 8 × 8 crossbar connectivity

Fully buffered signal path supports multicast and broadcast

operation

Optimized for dc to 4.25 Gbps data

Programmable receive equalization

Compensates for up to 30 in. of FR4 @ 4.25 Gbps

Programmable transmit pre-emphasis/de-emphasis

Compensates for up to 30 in. of FR4 @ 4.25 Gbps

Flexible 1.8 V to 3.3 V core supply

Per lane positive/negative (P/N) pair inversion for routing ease

Low power: 125 mW/channel at 4.25 Gbps

DC- or ac-coupled differential CML inputs

Programmable CML output levels

50 Ω on-chip termination

−40°C to +85°C temperature range operation

Supports 8b10b, scrambled or uncoded nonreturn-to-zero

(NRZ) data

Package: 64-lead LFCSP

APPLICATIONS

1×, 2×, 4× FibreChannel

XAUI

Gigabit Ethernet over backplane

10GBase-CX4

InfiniBand®

50 Ω cables

FUNCTIONAL BLOCK DIAGRAM

RECEIVE

EQUALIZATION

CROSSPOINT

ARRAY

TRANSMIT

PRE-EMPHASIS

CONTROL LOGIC

ADN4600

IP[7:0]

IN[7:0]

ADDR[1:0]

SCL

SDA

RESETB

OP[7:0]

ON[7:0]

EQ

PE

Figure 1.

GENERAL DESCRIPTION

The ADN4600 is an asynchronous, nonblocking crosspoint

switch with eight differential PECL-/CML-compatible inputs

with programmable equalization and eight differential CML

outputs with programmable output levels and pre-emphasis or

de-emphasis. The operation of this device is optimized for NRZ

data at rates up to 4.25 Gbps.

The receive inputs provide programmable equalization with

nine settings to compensate for up to 30 in. of FR4 and

programmable pre-emphasis with seven settings to compensate

for up to 30 in. of FR4 at 4.25 Gbps.

The ADN4600 nonblocking switch core implements an 8 × 8

crossbar and supports independent channel switching through the

path supporting NRZ data rates from dc to 4.25 Gbps. Each

channel is fully independent of other channels. The ADN4600

has low latency and very low channel-to-channel skew.

The main application for the ADN4600 is to support switching

on the backplane, line card, or cable interface sides of serial links.

The ADN4600 is packaged in a 9 mm × 9 mm, 64-lead LFCSP

package and operates from −40°C to +85°C.