Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - drivers SDH/SONET 1/0 TQFP 32 EP

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

♦ 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

MAX3800

3.2Gbps Adaptive Equalizer

and Cable Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

DOUT

EIN

DIN

EOUT

MAX3800

DOUT

EIN

DIN

THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

EOUT

RMOD CIM

MAX3800

CARD 2

CARD 1

+3.3V

LOS RMOD CIMLOS

Typical Application Circuit

19-1953; Rev 3; 12/05

PART

TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX3800UGJ

0°C to +85°C

32 QFN

G3255-1

MAX3800UHJ

0°C to +85°C

32 TQFP-EP*

AA-EP

MAX3800UHJ+

0°C to +85°C

32 TQFP-EP*

AA-EP

*EP = exposed pad

+Denotes lead-free package.

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.

Summary of content (13 pages)

PAGE 1
9-1953; 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.
PAGE 2
MAX3800 3.2Gbps Adaptive Equalizer and Cable Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC..............................................-0.5V to +6.0V Voltage at LOS, RMOD, and CIM...............-0.5V to (VCC + 0.5V) Voltage at EIN+, EIN-, DIN+, DIN- .....(VCC - 1V) to (VCC + 0.5V) Current Out of EOUT+, EOUT-, DOUT+, DOUT- ................25mA Continuous Power Dissipation (TA = +85°C) 32-Pin TQFP-EP (derate 22.2mW/°C above +85°C) ...1444mW Operating Ambient Temperature Range ................
PAGE 3
.2Gbps Adaptive Equalizer and Cable Driver (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 5) PARAMETER SYMBOL CONDITIONS Maximum Input Data Rate MIN TYP MAX 3.2 UNITS Gbps CABLE DRIVER SPECIFICATIONS Random Jitter (Note 6) 2 4 mUIRMS Deterministic Jitter (Note 6) 20 60 mUIp-p Output Edge Speed 20% to 80% 59 76 ps Input Return Loss (Single-Ended) ≤3.2GHz 14 dB Output Return Loss (Single-Ended) ≤3.
PAGE 4
Typical Operating Characteristics (TA = +25°C, VCC = +3.3V, all jitter measurements done at 3.2Gbps, 700mV cable input with 213-1 PRBS pattern with 100 consecutive ones and 100 consecutive zeros substituted. Note: Test pattern produces near worst-case jitter results. Results will vary with pattern, unless otherwise noted.) DRIVER INPUT RETURN LOSS (S11) SUPPLY CURRENT vs. TEMPERATURE CABLE DRIVER OUTPUT VOLTAGE vs.
PAGE 5
3.2Gbps Adaptive Equalizer and Cable Driver MAX3800 toc12 MAX3800 toc11 MAX3800 toc10 68ps/div (2.5Gbps) 60ps/div (2.5Gbps) EQUALIZER OUTPUT EYE DIAGRAM AFTER 50FT OF MADISON #14887 SHIELDED TWISTED PAIR CABLE (DIFFERENTIAL, 27-1 PRBS) CIM VOLTAGE vs. CABLE LENGTH (RG179B 75Ω COAXIAL CABLE SINGLE-ENDED) CIM- 1.7 CIM VOLTAGE (V) MAX3800 toc15 1.8 MAX3800 toc14 MAX3800 toc13 EQUALIZER OUTPUT EYE DIAGRAM AFTER 100FT OF BELDEN 9207 CABLE (DIFFERENTIAL, 27-1 PRBS) 1.6 1.5 1.4 1.3 CIM+ 1.
PAGE 6
3.2Gbps Adaptive Equalizer and Cable Driver MAX3800 Pin Description PIN NAME 1, 3, 6, 11, 14 VCCE Equalizer Power Supply FUNCTION 2, 7, 10, 15, 23, 24, 26, 31 GND Ground 4 EIN+ Positive Equalizer Input, CML 5 EIN- Negative Equalizer Input, CML 8 CIM- Negative Cable Integrity Monitor (CIM) Output 9 CIM+ Positive Cable Integrity Monitor (CIM) Output 12 EOUT- Negative Equalizer Output, CML Positive Equalizer Output, CML 13 EOUT+ 16, 17 N.C. No Connection. Leave unconnected.
PAGE 7
CIM- MAX3800 CIM+ 3.2Gbps Adaptive Equalizer and Cable Driver 200MHz PWR DETECTOR FLAT RESPONSE AMP 600MHz PWR DETECTOR LOOP FILTER |H(f)| VARIABLE ATTENUATOR |H(f)| EIN Σ √f CML SKIN EFFECT COMPENSATION AMP P0WER DETECTOR CML EOUT VARIABLE ATTENUATOR CURRENT STEERING NETWORK MAX3800 LOS DOUT LIMITING AMP CABLE DRIVER CML DIN CML RMOD Figure 1. Functional Diagram VCC VCC ESD STRUCTURES 62.5Ω 50Ω 62.5Ω 50Ω OUT+ IN+ OUT- IN- ESD STRUCTURES GND GND Figure 2.
PAGE 8
MAX3800 3.2Gbps Adaptive Equalizer and Cable Driver CML, see Maxim application note HFAN-1.0, Interfacing Between CML, PECL, and LVDS. Flat Response and Skin-Effect Compensation Amplifiers The buffered input waveform is fed equally to two amplifiers—the flat response amplifier and the skineffect compensation amplifier.
PAGE 9
3.2Gbps Adaptive Equalizer and Cable Driver MAX3800 Single-Ended Operation For single-ended operation of the cable driver or equalizer, connect the unused input to ground through a series combination of a capacitor (of equal value to other AC-coupling capacitors) and a 50Ω resistor. Note that the MAX3800 is specified for differential operation. Layout Considerations The MAX3800’s performance can be significantly affected by circuit-board layout and design.
PAGE 10
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 32L QFN.EPS MAX3800 3.
PAGE 11
3.2Gbps Adaptive Equalizer and Cable Driver ______________________________________________________________________________________ 11 MAX3800 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.
PAGE 12
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 32L,TQFP.EPS MAX3800 3.2Gbps Adaptive Equalizer and Cable Driver PACKAGE OUTLINE, 32L TQFP, 5x5x1.
PAGE 13
3.2Gbps Adaptive Equalizer and Cable Driver PACKAGE OUTLINE, 32L TQFP, 5x5x1.0mm, EP OPTION 21-0079 F 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.