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General Description

The MAX3984 is a single-channel, preemphasis driver

with input equalization that operates from 1Gbps to

10.3Gbps. It provides compensation for copper links,

such as 8.5Gbps Fibre Channel and 10.3Gbps

Ethernet, allowing spans of up to 10m with 24 AWG

cable. The driver provides four selectable preemphasis

levels, and the selectable input equalizer compensates

for up to 10in of FR-4 circuit board material at 10Gbps.

The MAX3984 also features SFP-compliant loss-of-sig-

nal (LOS) detection and TX_DISABLE. Selectable out-

put swing reduces EMI and power consumption. The

MAX3984 is packaged in a lead-free, 3mm x 3mm,

16-pin thin QFN and operates from a 0°C to +85°C tem-

perature range.

Applications

Features

♦ Drives Up to 10m of 24 AWG Cable

♦ Drives Up to 30in of FR-4

♦ Selectable 1000mV

P-P

or 1200mV

P-P

Differential

Output Swing

♦ Selectable Output Preemphasis

♦ Selectable Input Equalization

♦ LOS Detection with Built-In Squelch

♦ Transmit Disable

♦ Hot Pluggable

MAX3984

1Gbps to 10Gbps Preemphasis Driver with

Receive Equalizer

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-0868; Rev 0; 7/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Denotes a lead-free package.

*EP = Exposed pad.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

Typical Operating Circuits continued at end of data sheet.

PART

TEMP

RANGE

PIN-PACKAGE

PKG

CODE

MAX3984UTE+ 0°C to +85° C 16 Thin QFN-EP* T1633F-3

8.5Gbps Fibre Channel

10.3Gbps Ethernet

Active Cable Assemblies

STM-64

TX_DISABLE

PE1

IN_LEV

PE0

OUT_LEV

IN+

IN-

LOS

GND

+3.3V

OUT+

OUT-

MAX3984

0.01μF

LOS

PE1

IN_LEV

PE0

OUT_LEV

GND

+3.3V

IN+

IN-

MAX3984

OUT+

OUT-

0.01μF

22pF

39Ω

22pF

0.01μF

39Ω

22pF

39Ω

22pF

39Ω

LOS

PE1

IN_LEV

PE0

OUT_LEV

IN+

IN-

GND

+3.3V

OUT+

OUT-

MAX3984

0.01μF

LOS

PE1

IN_LEV

PE0

OUT_LEV

TX_DISABLE

GND

+3.3V

IN+

IN-

MAX3984

OUT+

OUT-

0.01μF

≤ 10m (24 AWG)

UP TO 10Gbps

COPPER CABLE

DIFFERENTIAL

100Ω TWIN-AX

ACTIVE CABLE ASSEMBLY

Tx+

Tx-

Rx+

Rx-

DISK

ENCLOSURE

SWITCH

SERDES

≤ 5V

≥ 4.7kΩ

Rx+

Rx-

Tx+

Tx-

FABRIC SWTCH

SWITCH

SERDES

≤ 5V

PULLUP

≥ 4.7kΩ

Typical Operating Circuits

Summary of content (18 pages)

PAGE 1
KIT ATION EVALU E L B AVAILA 19-0868; Rev 0; 7/07 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer The MAX3984 is a single-channel, preemphasis driver with input equalization that operates from 1Gbps to 10.3Gbps. It provides compensation for copper links, such as 8.5Gbps Fibre Channel and 10.3Gbps Ethernet, allowing spans of up to 10m with 24 AWG cable.
PAGE 2
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer ABSOLUTE MAXIMUM RATINGS Logic Inputs Range (PE1, PE0, TX_DISABLE, IN_LEV, OUT_LEV) ..........-0.5V to (VCC + 0.5V) LOS Open-Collector Supply Voltage Range (with ≥ 4.7kΩ pullup) .........................................-0.5V to +5.5V Storage Ambient Temperature Range (TSTG) ...-55°C to +150°C Supply Voltage Range (VCC).................................-0.5V to +4.1V Continuous Output Current Range (OUT+, OUT-) ...............................
PAGE 3
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer (VCC = +3.0V to +3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, VCC = +3.3V, unless otherwise noted.
PAGE 4
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, VCC = +3.3V, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS Source to IN Residual Output Deterministic Jitter at 5.0Gbps (Notes 4, 8, and 9) 6-mil, 10in of FR-4 Source to IN Residual Output Deterministic Jitter at 8.
PAGE 5
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer (VCC = +3.0V to +3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, VCC = +3.3V, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS LOS asserted LOS Open-Collector Current Sink LOS asserted; VOL 0.4V (Note 12) LOS Response Time (Note 4) Time from VIN dropping below deassert level or rising above assert level to 50% point of LOS output transition LOS Transition Time Rise time or fall time (10% to 90%); pullup supply = 5.
PAGE 6
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer VLOW_PP VHIGH_PP ⎡⎛ ⎡ VHIGH_PP ⎛⎢ ⎜ PE(dB) = 20 log ⎢⎢⎜ ⎢ V ⎣⎝ LOW_PP ⎝⎣ Figure 1. TX Preemphasis in dB TRANSMIT TEST SETUP A B PCB (FR-4) SIGNAL SOURCE MAX3984 6 MILS IN 24 AWG 100Ω TWIN-AX OUT 1in ≤ L ≤ 10in 6 MILS L = 2in SMA CONNECTORS SMA CONNECTORS L ≤ 1in 6 MILS FR-4 4.0 ≤ εR ≤ 4.4 tanδ = 0.022 OSCILLOSCOPE OR ERROR DETECTOR D Figure 2.
PAGE 7
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer MAX3984 RECEIVE TEST SETUP A D PCB (FR-4) SIGNAL SOURCE MAX3984 6 MILS IN OUT 6 MILS L = 2in OSCILLOSCOPE OR ERROR DETECTOR L = 10in SMA CONNECTORS SMA CONNECTORS FR-4 4.0 ≤ εR ≤ 4.4 tanδ = 0.022 Figure 3. Receive-Side Test Setup (The points labeled A and D are referenced for AC parameter tests.) Typical Operating Characteristics (VCC = +3.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25°C, PRBS7 + 100 CID pattern is PRBS 27, 100 zeros, 1010, PRBS 27, 100 ones, 0101, OUT_LEV = high, 10in of FR-4 at the input, IN_LEV = high, 360mVP-P at input of FR-4, unless otherwise noted.) 0.6 0.5 PE[1,0] = 10 0.4 0.3 0.2 PE[1,0] = 01 0.6 0.5 PE[1,0] = 10 0.4 0.3 0 10 20 0 10 20 INPUT RETURN LOSS vs. FREQUENCY -20 -25 -30 -35 0.4 0.3 PE[1,0] = 11 0 0 MAX3984 toc09 MAX3984 toc08 2.5Gbps K28.
PAGE 9
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer PE[1,0] = 10 400 PE[1,0] = 11 300 200 100 600 IN_LEV = LOW, 0in OF FR-4 AT THE INPUT PE[1,0] = 01 500 PE[1,0] = 10 400 PE[1,0] = 11 300 200 10 20 30 40 IN_LEV = LOW, 0in OF FR-4 AT THE INPUT PE[1,0] = 01 500 PE[1,0] = 10 400 PE[1,0] = 11 300 200 0 0 0 PE[1,0] = 00 600 100 100 0 700 MAX3984 toc15 PE[1,0] = 00 VERTICAL EYE OPENING (mVP-P) PE[1,0] = 01 500 0 10 20 30 0 40 10 20 40 30 FR-4 LENGTH (in) FR-4 LENGTH (in)
PAGE 10
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer Pin Description PIN NAME 1 VCC1 FUNCTION 2 IN+ Positive Data Input, CML. This input is internally terminated with 50 . 3 IN- Negative Data Input, CML. This input is internally terminated with 50 . 4, 8, 9, 16 GND 5 OUT_LEV Output-Swing Control Input, LVTTL with 20k Internal Pullup. Set to TTL high or open for maximum output swing, or set to TTL low for reduced swing.
PAGE 11
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer 10kΩ VCC2 MAX3984 2 2 LVTTL PEO VCC2 PE1 1 IN+ OUT+ LIMITER CML PREEMPHASIS FIXED EQUALIZER IN- CML OUT- 0 LOS SIGNAL DETECT VCC2 40kΩ IN_LEV VCC2 LVTTL VCC2 10kΩ TX_DISABLE VCC2 LVTTL VCC2 20kΩ OUT_LEV VCC2 LVTTL GND Figure 4. Functional Diagram The IN_LEV pin sets the LOS assert and deassert levels. When IN_LEV is LVTTL high or open, the LOS assert threshold is 300mVP-P.
PAGE 12
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer Typical Characteristics at -40°C The MAX3984 is guaranteed to work from 0°C to +85°C. Table 1 indicates typical performance outside the guaranteed limits. Table 1.
PAGE 13
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer PARAMETER SYMBOL CONDITIONS Source to IN Residual Output Deterministic Jitter at 10Gbps (Notes 4, 5) 6-mil, 10in of FR-4 OUT to load 3m, 24 AWG MIN PE1 PE0 0 1 5m, 24 AWG 1 0 7m, 24 AWG 1 1 10m, 24 AWG 1 1 TYP 0.25 MAX UNITS UI P-P Note 1: Load is 50Ω ±1% at each side and the pattern is 0000011111 or equivalent pattern at 2.5Gbps. Note 2: PE1 = PE0 = logic-high (maximum preemphasis), load is 50Ω ±1% at each side.
PAGE 14
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer Layout Considerations Exposed-Pad Package Circuit board layout and design can significantly affect the performance of the MAX3984. Use good high-frequency design techniques, including minimizing ground inductance and using controlled-impedance transmission lines on the data signals. Power-supply decoupling should also be placed as close as possible to the V CC pins. Always connect all V CC pins to a power plane.
PAGE 15
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer BLADE BACKPLANE +3.3V +3.3V ≤ 30in of FR-4 UP TO 10Gbps TX_DISABLE VCC LOS PE0 PE0 SWITCH OR SERDES VCC OR GND 0.01μF Tx+ LOS PE1 IN_LEV MAX3984 OUT_LEV IN- GND 0.01μF VCC OR GND IN- +3.3V IN+ OUT- IN- GND PE1 MAX3984 Rx- VCC 0.01μF IN+ Tx- IN- OUT- PE0 LOS Tx+ MAX3984 PE1 0.01μF VCC OR GND OUT_LEV OUT_LEV LOS OUT+ IN_LEV IN_LEV Rx+ OUT- +3.3V 0.01μF PE0 0.01μF SWITCH OR SERDES 0.01μF 0.
PAGE 16
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer Pin Configuration Chip Information GND IN_LEV LOS TX_DISABLE PROCESS: SiGe Bipolar 16 15 14 13 TOP VIEW IN+ 2 IN- 3 GND 4 12 VCC2 11 OUT+ MAX3984UTE 10 OUT- EP* OUT_LEV 5 6 7 8 GND 1 PE0 VCC1 PE1 + 9 GND THIN QFN-EP (3mm × 3mm) *THE EXPOSED PAD OF THE QFN PACKAGE MUST BE SOLDERED TO GROUND FOR PROPER THERMAL OPERATION OF THE MAX3984.
PAGE 17
1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer 12x16L QFN THIN.EPS (NE - 1) X e E MARKING 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 0.08 C C L A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.
PAGE 18
MAX3984 1Gbps to 10Gbps Preemphasis Driver with Receive Equalizer 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.) PKG 8L 3x3 12L 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.