General Description

The MAX3800 is a +3.3V adaptive cable equalizer and

cable driver implemented together on a single chip. It is

designed for coaxial and twin-axial cable point-to-point

communications applications. The driver features differ-

ential current-mode logic (CML) inputs and outputs as

well as adjustable output amplitude. The equalizer

includes differential CML data inputs and outputs, a

loss-of-signal (LOS) output, and a cable integrity moni-

tor (CIM) output.

The adaptive cable equalizer is capable of equalizing

differential or single-ended signals at data rates up to

3.2Gbps. It automatically adjusts to attenuation caused

by skin-effect losses of up to 30dB at 1.6GHz. The

equalizer effectively extends the usable length of cop-

per cable in high-frequency interconnect applications.

The MAX3800 is available in a 32-pin TQFP package

with exposed pad and consumes only 200mW at

+3.3V. The driver can be disconnected from the power

supply when it is not needed, resulting in a 40% reduc-

tion in supply current.

Applications

High-Speed Links in Communications

and Data Systems

Backplane and Interconnect Applications

SDH/SONET Transmission Equipment

Features

o Single +3.3V Operation

o Typical Power Dissipation = 200mW at +3.3V

o Data Rates Up to 3.2Gbps

o Adjustable Cable Driver Output Amplitude

o Equalizer Automatically Adjusts for Different

Cable Lengths

o 0dB to 30dB Equalization at 1.6GHz (3.2Gbps)

o Loss-of-Signal (LOS) Indicator

o Cable Integrity Monitor (CIM)

o On-Chip Input and Output Terminations

o Low External Component Count

o Operating Temperature Range = 0°C to +85°C

o ESD Protection on Cable Inputs and Outputs

3.2Gbps Adaptive Equalizer

and Cable Driver

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

DOUT

EIN

DIN

MAX3800

DOUT

EIN

DIN

THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

RMOD

CIM

MAX3800

+3.3V

+3.3V

LOS

RMOD

CIM

LOS

Typical Application Circuit

19-1953; Rev 1; 11/01

PART

TEMP. RANGE

PIN-PACKAGE

MAX3800UGJ

0

°C to +85°C

32 QFN

MAX3800UHJ

0

°C to +85°C

32 TQFP-EP*

*EP = exposed pad

Pin Configuration appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.