19-1953; Rev 3; 12/05
3.2Gbps Adaptive Equalizer
and Cable Driver
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 differential 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 monitor (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 copper 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% reduction in supply current.
Features
♦ Single +3.3V Operation
♦ Typical Power Dissipation = 200mW at +3.3V
♦ Data Rates Up to 3.2Gbps
♦ Adjustable Cable Driver Output Amplitude
♦ Equalizer Automatically Adjusts for Different
Cable Lengths
♦ 0dB to 30dB Equalization at 1.6GHz (3.2Gbps)
♦ Loss-of-Signal (LOS) Indicator
♦ Cable Integrity Monitor (CIM)
♦ On-Chip Input and Output Terminations
♦ Low External Component Count
♦ Operating Temperature Range = 0°C to +85°C
♦ ESD Protection on Cable Inputs and Outputs
Applications
High-Speed Links in Communications
and Data Systems
Ordering Information
TEMP
RANGE
PART
PINPACKAGE
PKG
CODE
Backplane and Interconnect Applications
MAX3800UGJ
0°C to +85°C
32 QFN
SDH/SONET Transmission Equipment
MAX3800UHJ
0°C to +85°C
32 TQFP-EP*
AA-EP
MAX3800UHJ+
0°C to +85°C
32 TQFP-EP*
AA-EP
Pin Configuration appears at end of data sheet.
G3255-1
*EP = exposed pad
+Denotes lead-free package.
Typical Application Circuit
+3.3V
CARD 1
DIN
DOUT
MAX3800
LOS
MAX3800
EIN
EOUT
RMOD
EOUT
EIN
CARD 2
+3.3V
DOUT
CIM
LOS
DIN
RMOD
CIM
THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX3800
General Description
