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General Description

The MAX3982 is a single-channel, copper-cable preem-

phasis driver that operates from 1Gbps to 4.25Gbps. It

provides compensation for copper links, such as

4.25Gbps Fibre Channel, allowing spans of up to 15m

with 24AWG. The cable driver provides four selectable

preemphasis levels. The input compensates for up to

10in of FR4 circuit board material at 4.25Gbps.

The MAX3982 also features SFP-compliant loss-of-signal

detection with selectable sensitivity and TX_DISABLE.

Selectable output swing reduces EMI and power con-

sumption. It is packaged in a 3mm x 3mm, 16-pin thin

QFN and operates from 0°C to +85°C temperature range.

Applications

SFP Active Copper-Cable Assemblies

Backplanes

1.0625Gbps, 2.125Gbps, and 4.25Gbps Fibre

Channel

1.25Gbps Ethernet

2.488Gbps STM16

InfiniBand

PCI Express

Features

♦ Drives Up to 15m with 24AWG Cable

♦ Drives Up to 30in of FR4

♦ 0.25W Total Power with +3.3V Supply

♦ Selectable 1600mV

P-P

or 1200mV

P-P

Differential

Output Swing

♦ Selectable Output Preemphasis

♦ Fixed Input Equalization

♦ Loss-of-Signal Detection with Selectable

Sensitivity

♦ Transmit Disable

MAX3982

SFP Copper-Cable Preemphasis Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3354; Rev 2; 2/06

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.

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX3982UTE

0°C to +85°C

16 Thin QFN

T1633-4

MAX3982UTE+

0°C to +85°C

16 Thin QFN

T1633-4

MAX3982

+3.3V

TX_DISABLE

PE0

PE1

LOSLEV

IN+

OUTLEV

IN-

LOS

OUT+

OUT-

0.01μF

GND

SWITCH OR

SERDES

X+

X-

4.25Gbps LIMITING

AMPLIFIER

+3.3V

OUT+

OUT-

IN+

IN-

LOS

0.01μF

X+

X-

≤ 5V

≥4.7kΩ

GND

4.25Gbps LIMITING

AMPLIFIER

+3.3V

TX_DISABLE

PE0

PE1

LOSLEV

IN+

OUTLEV

IN-

LOS

OUT+

OUT-

0.01μF

MAX3982

+3.3V

OUT+

OUT-

IN+

IN-

LOS

0.01μF

GND

SWITCH OR

SERDES

X+

X-

X+

X-

DISK

ENCLOSURE

FABRIC SWITCH

GND

≤ 5V

≥ 4.7kΩ

COPPER-CABLE

DIFFERENTIAL 100Ω TWIN-AX

SFP ACTIVE CABLE ASSEMBLY

≤ 15m (24AWG)

UP TO 4.25Gbps

Typical Application Circuit

Pin Configuration appears at end of data sheet.

+Denotes lead-free package.

Summary of content (15 pages)

PAGE 1
9-3354; Rev 2; 2/06 KIT ATION EVALU E L B AVAILA SFP Copper-Cable Preemphasis Driver The MAX3982 is a single-channel, copper-cable preemphasis driver that operates from 1Gbps to 4.25Gbps. It provides compensation for copper links, such as 4.25Gbps Fibre Channel, allowing spans of up to 15m with 24AWG. The cable driver provides four selectable preemphasis levels. The input compensates for up to 10in of FR4 circuit board material at 4.25Gbps.
PAGE 2
MAX3982 SFP Copper-Cable Preemphasis Driver ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC..............................................-0.5V to +6.0V Continuous CML Output Current at OUT+, OUT-..............................................-25mA to +25mA Voltage at IN+, IN-, LOSLEV, LOS, TX_DISABLE, PE0, PE1, OUTLEV ..........-0.5V to (VCC + 0.5V) LOS Open Collector Supply Voltage with ≥ 4.7kΩ Pullup Resistor..............................-0.5V to +5.5V Continuous Power Dissipation at +85°C (derate 20.
PAGE 3
SFP Copper-Cable Preemphasis Driver MAX3982 ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C and VCC = +3.3V, unless otherwise noted.
PAGE 4
MAX3982 SFP Copper-Cable Preemphasis Driver VLOW_PP VHIGH_PP ⎡ ⎛V ⎞⎤ HIGH _ PP ⎥ PE(dB) = 20 ⎢log ⎜ ⎟ ⎢ ⎜⎝ VLOW _ PP ⎟⎠ ⎥ ⎣ ⎦ Figure 1. Illustration of Tx Preemphasis in dB TEST SETUP PCBOARD (FR4) SIGNAL SOURCE A B MAX3982 6 mil IN 24AWG 100Ω TWIN-AX OUT 1in ≤ L ≤ 10in 6 mil L = 2in SMA CONNECTORS SMA CONNECTORS OSCILLOSCOPE OR ERROR DETECTOR L ≤ 1in 6 mil D FR4 4.0 ≤ εR ≤ 4.4 tan δ = 0.022 Figure 2. Test Setup.
PAGE 5
SFP Copper-Cable Preemphasis Driver MAX3982 TEST SETUP PC BOARD (FR4) A SIGNAL SOURCE B MAX3982 6 mil SMA CONNECTORS IN 24AWG 100Ω TWIN-AX 6 mil OUT 1in ≤ L ≤ 12in L = 2in L ≤ 1in L ≤ 1in SMA CONNECTORS 39Ω OSCILLOSCOPE OR ERROR DETECTOR 22pF MAX3748 6 mil OUT IN 22pF FR4 4.0 ≤ εR ≤ 4.4 tan δ = 0.022 D 39Ω Figure 3. End-to-End Test Setup Using the MAX3748 as a Receiver. Deterministic jitter and eye diagrams measured at point D. Typical Operating Characteristics (VCC = +3.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101.) END-TO-END EYE DIAGRAM, 20m 24AWG CABLE AT 4.25Gbps END-TO-END EYE DIAGRAM, 20m 24AWG CABLE AT 2.125Gbps MAX3982 toc04 0.35 0.30 PE[1,0] = 01 0.25 0.20 PE[1,0] = 10 0.15 PE[1,0] = 11 0.10 PE[1,0] = 00 600 500 PE[1,0] = 01 400 PE[1,0] = 10 300 PE[1,0] = 11 200 100 0.05 4.
PAGE 7
SFP Copper-Cable Preemphasis Driver (VCC = +3.3V, TA = +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101.) 15m 24AWG CABLE ASSEMBLY OUTPUT WITH MAX3982 PREEMPHASIS, 4.25Gbps CJTPAT MAX3982 toc11 DETERMINISTIC JITTER vs. CABLE LENGTH MAX3982 toc12 1.0 40mV/div DETERMINISTIC JITTER (UI) 4.25Gbps PRBS7 + 100CID 0.8 MAX3982 toc13 15m 24AWG CABLE ASSEMBLY OUTPUT WITHOUT MAX3982, 4.25Gbps CJTPAT PE[1,0] = 00 PE[1,0] = 01 0.6 PE[1,0] = 10 0.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101.) 15m 24AWG CABLE ASSEMBLY OUTPUT WITHOUT MAX3982, 4.25Gbps PRBS31 15m 24AWG CABLE ASSEMBLY OUTPUT WITH MAX3982 PREEMPHASIS, 4.25Gbps PRBS31 MAX3982 toc17 HOT-PLUG WITH TX_DISABLE LOW MAX3982 toc19 MAX3982 toc18 3.
PAGE 9
SFP Copper-Cable Preemphasis Driver (VCC = +3.3V, TA = +25°C, unless otherwise noted. PRBS7 + 100CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101.) 30in FR4 OUTPUT WITHOUT MAX3982 4.25Gbps PRBS7 + 100CID 30in FR4 OUTPUT WITH MAX3982 PREEMPHASIS, 4.25Gbps PRBS7 + 100CID MAX3982 toc23 TRANSMITTER ENABLE MAX3982 toc24 MAX3982 toc25 VCC 3.3V 100mV/div HIGH TX_DISABLE LOW OUT+ PREEMPHASIS, PE[1,0] = 10, OUTLEV = HIGH 200ns/div 30in FR4 OUTPUT WITH MAX3982 PREEMPHASIS, 4.
PAGE 10
MAX3982 SFP Copper-Cable Preemphasis Driver Pin Description PIN NAME FUNCTION 1 VCC1 2 IN+ Positive Data Input, CML. This input is internally terminated with 50Ω to VCC1. 3 IN- Negative Data Input, CML. This input is internally terminated with 50Ω to VCC1. 4, 8, 9 GND Power-Supply Connection for Input. Connect to +3.3V. Circuit Ground Output-Swing Control Input, LVTTL with 40kΩ Internal Pullup. Set to TTL high or open for maximum output swing, or set to TTL low for reduced swing.
PAGE 11
SFP Copper-Cable Preemphasis Driver MAX3982 VCC2 10kΩ VCC2 MAX3982 2 2 PE0 PE1 LVTTL VCC2 VCC1 LIMITER IN+ CML IN- FIXED EQUALIZER PREEMPHASIS OUT+ CML OUTLOS VCC1 SIGNAL DETECT 40kΩ LOSLEV VCC1 LVTTL VCC2 10kΩ VCC2 LVTTL TX_DISABLE VCC2 40kΩ VCC2 LVTTL OUTLEV GND Figure 4. Functional Diagram Detailed Description The MAX3982 comprises a PC board receiver, a cable driver, and a loss-of-signal detector with adjustable threshold (Figure 4). Equalization is provided in the receiver.
PAGE 12
MAX3982 SFP Copper-Cable Preemphasis Driver Table 1. Preemphasis Translation Ratio α VHIGH _ PP VHIGH _ PP − VLOW _ PP VLOW _ PP VHIGH _ PP + VLOW _ PP 1.26 0.11 0.21 2 1.58 0.23 0.37 4 2.51 0.43 0.6 8 5.01 0.67 0.8 14 10Gbase–CX4 1− VLOW _ PP VHIGH _ PP IN dB ⎡ ⎛V ⎞⎤ HIGH _ PP ⎥ 20 ⎢log ⎜ ⎟ ⎢ ⎜⎝ VLOW _ PP ⎟⎠ ⎥ ⎣ ⎦ VLOW_PP VHIGH_PP Layout Considerations Applications Information Autodetect The MAX3982 can automatically detect an incoming signal and enable the data outputs.
PAGE 13
SFP Copper-Cable Preemphasis Driver MAX3982 LOS VCCX RPULLUP GND LVTTL IN Figure 8. Loss-of-Signal Equivalent Output Structure GND LOSLEV VCCX RPULLUP (kΩ) 40 VCC1 OUTLEV VCC2 40 TX_DISABLE, PE0, PE1 VCC2 10 PIN NAME Chip Information TRANSISTOR COUNT: 2957 PROCESS: SiGe Bipolar Figure 7.
PAGE 14
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.) (NE - 1) X e E MARKING 12x16L QFN THIN.EPS MAX3982 SFP Copper-Cable Preemphasis Driver E/2 D2/2 (ND - 1) X e D/2 AAAA e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C C L C L 0.08 C A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.
PAGE 15
SFP Copper-Cable Preemphasis Driver PKG 8L 3x3 12L 3x3 16L 3x3 REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. A 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 b 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 D 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 E 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 e L 0.65 BSC. 0.35 N 0.55 0.50 BSC. 0.50 BSC. 0.75 0.45 0.55 0.65 0.30 12 8 0.40 ND 2 3 4 2 3 4 0 A1 k 0.02 0.05 0 0.25 - 0.02 0.