MAXIM MAX3803 User Manual

General Description

The MAX3803 equalizer automatically provides com­pensation for transmission-medium losses encountered
with FR4 stripline and cable in an incredibly small 2mm
× 2.5mm package. It is ideal for backplane applications
requiring up to 40in between the line card and the
switch card or up to 10m of twin ax cable between
racks. Its small size provides placement and routing
flexibility. The CML inputs and outputs are DC-coupled
and can be terminated to a supply as low as +1.1V.
The MAX3803 operates from 0°C to +85°C and con­sumes 160mW at +3.3V.

Applications

Backplane Interconnect

Rack-to-Rack Interconnect

Common-Mode Voltage Translation
(LVDS, PECL, or CML)

Features

♦ DC-Coupled Input and Output to Terminations

as Low as +1.1V

♦ 2mm × 2.5mm UCSP

TM

♦ 1Gbps to 3.2Gbps Operating Range

♦ Spans 40in (1m) of FR4

♦ Spans 10m, 28AWG Twin Ax

♦ Receive Equalization to Reduce ISI

MAX3803

DC-Coupled, UCSP 3.125Gbps Equalizer

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAC
WITH

SERDES

Rx Tx

Tx Rx

+1.1V ≤ V ≤ V

CC

+3.3V

+1.1V ≤ V ≤ V

CC

SWITCH

ASIC
WITH

SERDES

Rx

Tx

+1.1V ≤ V ≤ V

CC

+1.1V ≤ V ≤ V

CC

2222

IN

V

TIVCC

+3.3V

V

CC

V

TO

OUT

OUT

V

TO

V

TI

IN

22 22

≤40in (1m)

FR4 STRIPLINE

FR4 STRIPLINE

PC BOARD

BACKPLANE

LINE CARD SWITCH CARD

MAX3803

MAX3803

Typical Application Circuit

19-2699; Rev 1; 6/04

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.

Pin Configuration appears at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

PART TEMP RANGE PIN-PACKAGE

MAX3803UBP-T

0°C to +85°C 5 x 4 UCSP

MAX3803

DC-Coupled, UCSP 3.125Gbps Equalizer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

OPERATING CONDITIONS

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, VTI, and VTO..........................-0.5V to +6V

Continuous Output Current ...............................-25mA to +25mA

IN±, OUT±, EN............................................-0.5V to (V

CC

+ 0.5V)

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

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

PARAMETER

CONDITIONS

UNITS

Supply Voltage V

CC

3.0 3.3 3.6 V

Input Termination Voltage V

TI

1.1

V

Output Termination Voltage V

TO

1.1

V

10Hz ≤ f < 100Hz

100Hz ≤ f < 1MHz 40Supply Noise Tolerance

1MHz ≤ f ≤ 2.5GHz 10

mV

P-P

02585°C

Bit Rate NRZ data

Gbps

CID Consecutive identical digits 100 bits

ELECTRICAL CHARACTERISTICS

(Typical values are at +3.3V and at TA= +25°C, unless otherwise noted. Specifications guaranteed over specified operating conditions.)

PARAMETER

SYMBOL

CONDITIONS MIN

TYP

MAX

UNITS

EN = high 45 67

Supply Current (Note 1)

EN = low 14 32

mA

Output Driver Supply Current (Note 2) 9 14 mA

Input Swing (Note 1)

400

mV

P-P

Input Common-Mode Voltage
Range

(Note 1)

V

TI

-

V

TI

­V

Input Return Loss 100MHz to 2.5GHz 10 dB

Input Resistance Single ended (Note 1)

50

Ω

EN = high 440

680

Output Swing (Notes 1, 3)

EN = low 30

mV

P-P

Output Common-Mode Voltage

V

TO

­V

Output Resistance Single ended (Note 1)

50

Ω

Output Return Loss 100MHz to 2.5GHz 10 dB

Output Transition Time tr, t

f

20% to 80% (Notes 2, 4) 40 70 100 ps

Differential Skew

Difference in 50% crossing between OUT+
and OUT-

10 ps

Operating Ambient Temperature

SYMBOL

MIN TYP MAX

100

2.488 3.125

Measured differentially at point A (Figure 1)

0.25V

42.5

42.5

525

0.112V

V

CC

V

CC

1000

0.10V

57.5

57.5

MAX3803

DC-Coupled, UCSP 3.125Gbps Equalizer

_______________________________________________________________________________________ 3

Note 1: Production tested at TA= +25°C. Specifications over temperature are guaranteed by design and characterization.
Note 2: Specifications are guaranteed by design and characterization.
Note 3: Measured differentially at point C with 50Ω±1% at each side (Figure 1).
Note 4: Using a 0000011111 or equivalent pattern at selected bit rate. Measured at 600mV

P-P

input voltage, 10m cable or 40in FR4,

at 2.5Gbps and within 2in of output pins.

Note 5: Difference in peak-to-peak deterministic jitter between reference points A and C in Figure 1. Evaluated at 2.5Gbps with CJTPAT.
Note 6: Difference in peak-to-peak deterministic jitter between reference points A and C in Figure 1. Evaluated at 2.5Gbps with a

PRBS 2

7

with 100 CIDs input pattern.

Note 7: Difference in peak-to-peak deterministic jitter between reference points A and C in Figure 1. Evaluated at 3.125Gbps with

CJTPAT.

ELECTRICAL CHARACTERISTICS (continued)

(Typical values are at +3.3V and at TA= +25°C, unless otherwise noted. Specifications guaranteed over specified operating conditions.)

PARAMETER

CONDITIONS MIN

UNITS

0in, 6-mil FR4

10in, 6-mil FR4

20in, 6-mil FR4

30in, 6-mil FR4

40in, 6-mil FR4

3m Tensolite cable

5m Tensolite cable 0.1

Resi d ual D eter m i ni sti c Ji tter Outp ut
( 2.5Gb p s, C JTP AT) ( N otes 2, 5)

10m Tensolite cable

UI

0in, 6-mil FR4

10in, 6-mil FR4

20in, 6-mil FR4

30in, 6-mil FR4

Resi d ual D eter m i ni sti c Ji tter Outp ut
( 2.5Gb p s, 2

7

P RBS + 100 C ID )

( N otes 2, 6)

3m Tensolite cable

UI

0in, 6-mil FR4

10in, 6-mil FR4

20in, 6-mil FR4

30in, 6-mil FR4

40in, 6-mil FR4

3m Tensolite cable

Resi d ual D eter m i ni sti c Ji tter Outp ut

( 3.125Gb p s, C JT P AT) ( N otes 2, 7)

5m Tensolite cable

UI

Random Jitter Output (Notes 2, 4) 2 3

ps

RMS

Latency From IN to OUT 0.3 ns

Low-Frequency Cutoff 15 kHz

LV TTL Inp ut H i g h V ol tag eV

IH

( N ote 1) 1.5 V

LVTTL Input Low Voltage V

IL

( N ote 1) 0.5 V

LV TTL Inp ut H i g h C ur r ent I

IH

( N ote 1) 10 µA

LVTTL Input Low Current I

IL

( N ote 1) 10 µA

SYMBOL

TYP MAX

0.01 0.10

0.04 0.10

0.05 0.10

0.05 0.15

0.07 0.15

0.03 0.10

0.14 0.25

0.01 0.10

0.06 0.10

0.11 0.15

0.15 0.20

0.09 0.15

0.01 0.10

0.02 0.10

0.03 0.15

0.06 0.15

0.11 0.25

0.05 0.10

0.16 0.25

0.20