MAXIM MAX3801 Technical data

General Description

The MAX3801 is a +3.3V adaptive cable equalizer
designed for coaxial and twin-axial cable point-to-point
communications applications. 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 MAX3801 is available in a 24-pin QFN package
with exposed pad and consumes only 125mW at
+3.3V.

Applications

High-Speed Links in Communications
and Data Systems

Backplane and Interconnect Applications

SDH/SONET Transmission Equipment

Features

♦ Single +3.3V Operation

♦ Typical Power Dissipation = 125mW at +3.3V

♦ Data Rates Up to 3.2Gbps

♦ 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 Inputs and Outputs

MAX3801

3.2Gbps Adaptive Equalizer

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

EIN EOUT

MAX3801

EIN

THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

EOUT

CIM

MAX3801

CARD 2

CARD 1

+3.3V

+3.3V

LOS

CIM

LOS

Typical Application Circuit

19-1999; Rev 4; 7/04

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.

PART

TEMP

RANGE

PIN­PACKAGE

PACKAGE

CODE

MAX3801UGG

24 QFN

MAX3801UTG

T2444-2

MAX3801UTG+

T2444-2

Pin Configuration appears at end of data sheet.

+Denotes lead-free package.

0°C to +85°C
0°C to +85°C 24 Thin QFN
0°C to +85°C 24 Thin QFN

G2444-1

MAX3801

3.2Gbps Adaptive Equalizer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +3.46V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage, VCC..............................................-0.5V to +6.0V

Voltage at LOS, CIM+, CIM-.......................-0.5V to (V

CC

+ 0.5V)

Voltage at EIN+, EIN- .........................(V

CC

- 1V) to (VCC+ 0.5V)

Current Out of EOUT+, EOUT-............................................25mA

Continuous Power Dissipation (T

A

= +85°C)

24-Lead QFN-EP (derate 25.1mW/°C above +85°C) .1630mW

Operating Ambient Temperature Range ................0°C to +85°C

Storage Temperature Range .............................-55°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current I

CC

Includes external load current 37 60 mA

INPUT SPECIFICATIONS

M i ni m um C ab l e Inp ut ( D i ffer enti al )

MV

P-P

M axi m um C ab l e Inp ut ( D i ffer enti al )

mV

P-P

Input Impedance Single-ended 40 53

Ω

OUTPUT SPECIFICATIONS

Output Voltage (Differential) (Note 2)

mV

P-P

Output Impedance Single-ended 50 65 75 Ω

V ol tag e at C IM Outp ut ( D i ffer enti al )

V

CIM

No external load, V

CIM

= (V

CIM+

) - (V

CIM-

)

V

P-P

Voltage at CIM Output
(Single-Ended)

V

CIM+,

V

CIM-

No external load 0.5

V

Output high (Note 3) 2.4

Voltage at LOS

Output low (Note 3) 0.4

V

Outp ut C om m on- M od e V ol tag e Each output DC-coupled 50Ω to V

CC

V

CC

- 0.2 V

3.2Gbps, 30dB cable loss at 1.6GHz (Note 1) 650 700

1100

500 1000

62.5

-0.5 +0.5

V

CC

- 0.5

MAX3801

3.2Gbps Adaptive Equalizer

_______________________________________________________________________________________ 3

Note 1: Minimum cable input for LOS to assert high.
Note 2: Input voltage within specification limits, 50Ω to V

CC

at each output.

Note 3: 100kΩ load to ground.
Note 4: AC electrical characteristics are guaranteed by design and characterization.
Note 5: Includes random jitter and deterministic jitter.
Note 6: Differential cable input voltage = 700mV

P-P

, 3.2Gbps 2

13

- 1PRBS with 100 consecutive ones and 100 consecutive zeros

substituted. Cable loss is due to skin effect only.

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.14V to +3.46V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.) (Note 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Input Data Rate 3.2

Gbps

0dB cable loss (Note 6)

24dB cable loss (Note 6)

Residual Jitter (Note 5)

30dB cable loss (Note 6)

mUI

P-P

Output Edge Speed 20% to 80% 64 90 ps

Input Return Loss (Single-Ended)

≤3.2GHz 15 dB

Outp ut Retur n Loss ( S i ng l e- E nd ed )

≤3.2GHz 15 dB

Equalization Compensation 1.6GHz (skin-effect losses only) 30 dB

Equalization Time Constant 5µs

120 240

140 240

100 200