MAXIM MAX3983 User Manual

General Description

The MAX3983 is a quad copper-cable signal conditioner that operates from 2.5Gbps to 3.2Gbps. It provides compensation for 4x copper InfiniBand and 10Gbase-CX4 Ethernet links, allowing spans of 20m with 24AWG and 15m with 28AWG. The cable driver section provides four selectable preemphasis levels. The input to the cable driver compensates for up to 0.5m of FR4 circuit board material. The cable receiver section provides additional fixed input equalization while offering selectable preemphasis to drive FR4 circuit boards up to 0.5m.

The MAX3983 also features signal detection on all eight inputs and internal loopback that allows for diagnostic testing. It is packaged in a 10mm x 10mm, 68-pin QFN and operates from 0°C to +85°C.

Applications

4x InfiniBand (4 x 2.5Gbps)

10Gbase-CX4 Ethernet (4 x 3.125Gbps)

10G Fibre Channel XAUI (4 x 3.1875Gbps)

4x Copper-Cable or Backplane Transmission (1Gbps to 3.2Gbps)

Features

♦ Link Features

Span 20m with 24AWG, 15m with 28AWG Span 0.5m of FR4 on Each Host

1.6W Total Power with 3.3V Supply Loopback Function

♦ Cable Driver Features

Selectable Output Preemphasis FR4 Input Equalization Signal Detect for Each Channel Output Disable

♦ Cable Receiver Features

Selectable FR4 Output Preemphasis Cable Input Equalization Signal Detect for Each Channel Output Disable

MAX3983

Quad Copper-Cable Signal Conditioner

________________________________________________________________

Maxim Integrated Products

Typical Application Circuit

Ordering Information

19-2928; Rev 1; 2/07

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

Pin Configuration appears at end of data sheet.

Denotes lead-free package.

PART TEMP RANGE

PINPACKAGE

MAX398 3UGK 0°C to +85°C 68 QFN G6800-4

MAX398 3UGK+ 0°C to + 85°C 68 QFN G6800-4

PKG CODE

≤0.5m

0.01μF 0.01μF

TX_IN1

GND

TO HOST

TX_IN2

TX_IN3

TX_IN4

RX_OUT1

RX_OUT2

RX_OUT3

RX_OUT4

TX_PE0

TX_PE1

RX_PE

POR

LOOPBACK

RX_SD1

RX_SD2

RX_SD3

RX_SD4

SERDES

3V TO 5.5V

4.7kΩ 4.7kΩ

TO HOST

POR

3.3V

MAX3983

GND

[1:4]

TX_OUT1

TX_OUT2

TX_OUT3

TX_OUT4

RX_IN1

RX_IN2

RX_IN3

RX_IN4

TX_ENABLE RX_ENABLE

TX_SD1

TX_SD2

TX_SD3

TX_SD4

4x COPPER CABLE ASSEMBLY

≤20m (24AWG) ≤15m (28AWG)

TO MAX3983

3V TO 5.5V

MAX3983

Quad Copper-Cable Signal Conditioner

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, 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

Continuous CML Output Current at

TX_OUT[1:4]±, RX_OUT[1:4]± ..........................……….±25mA

Voltage at TX_IN[1:4]±, RX_IN[1:4]±, RX_SD[1:4],

TX_SD[1:4], RX_ENABLE, TX_ENABLE, RX_PE, TX_PE[0:1], LOOPBACK, POR

(with series resistor ≥4.7kΩ)...................-0.5V to (V

+ 0.5V)

Continuous Power Dissipation (T

= +85°C)

68-Pin QFN (derate 41.7mW/°C above +85°C)………….2.7W

Operating Junction Temperature Range (T

) ....-55°C to +150°C

Storage Ambient Temperature Range (T

) .......-55°C to +150°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

RX_EN = VCC, TX_EN = 0V 360 430

Supply Current

OPERATING CONDITIONS

Supply Voltage V

Supply Noise Tolerance 1MHz ≤ f < 2GHz 40 mV

Operating Ambient Temperature T

Bit Rate NRZ data (Note 1) 2.5 3.2 Gbps

CID Consecutive identical digits (bits) 10 Bits

STATUS OUTPUTS: RX_SD[1:4], TX_SD[1:4]

Signal-Detect Open-Collector Current Sink

Signal-Detect Response Time

Signal-Detect Transition Time Rise time or fall time (10% to 90%) 200 ns

Power-On Reset Delay 1µF capacitor on POR to GND 6 ms

CONTROL INPUTS: RX_ENABLE, TX_ENABLE, RX_PE, TX_PE0, TX_PE1, LOOPBACK

Voltage, Logic High V

Voltage, Logic Low V

Current, Logic High I

Current, Logic Low I

RX_EN = 0V, TX_EN = V

RX_EN = V

Signal detect asserted 0 25 µA

Signal detect unasserted VOL ≤ 0.4V with 4.7kΩ pullup resistor

= 0V, pullup supply = 5.5V, external pullup

resistor ≥4.7kΩ

Time from RX_IN[1:4] or TX_IN[1:4] dropping below 85mV 50% point of signal detect

VIH = V

VIL = 0V -150 +150 µA

, TX_EN = V

or rising above 175mV

P-P

365 430

495 580

3.0 3.3 3.6 V

02585°C

1.0 1.11 mA

025µA

0.35 µs

1.5 V

0.5 V

-150 +150 µA

P-P

MAX3983

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)

Quad Copper-Cable Signal Conditioner

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TX SECTION (CABLE DRIVER)

PC Board Input Swing

Input Resistance TX_IN[1:4]+ to TX_IN[1:4]-, differential 85 100 115 Ω

Input Return Loss 100MHz to 2GHz (Note 1) 10 17 dB

Output Swing

Output Resistance

Output Return Loss 100MHz to 2GHz (Note 1) 10 13 dB

Output Transition Time tr, tf20% to 80% (Notes 1, 3) 80 ps

Random Jitter (Notes 1, 3) 1.6 ps

Output Preemphasis See Figure 1

Residual Output Deterministic Jitter at 2.5Gbps (Notes 1, 4, 5)

Residual Output Deterministic Jitter at 3.2Gbps (Notes 1, 4, 5)

Signal-Detect Assert Level TX_IN for TX_SD = high (Note 6) 800 mV

Signal-Detect Off TX_IN for TX_SD = low (Note 6) 200 mV

RX SECTION (CABLE RECEIVER)

Cable Input Swing

Input Vertical Eye Opening

Input Resistance RX_IN[1:4]+ to RX_IN[1:4]-, differential 85 100 115 Ω

Input Return Loss 100MHz to 2GHz (Note 1) 10 18 dB

Measured differentially at the signal source (Note 1)

TX_ENABLE = high (Notes 1, 2) 1300 1500 1600

TX_ENABLE = low 30

TX_OUT[1:4]+ or TX_OUT[1:4]- to V ended

TX_PE1 TX_PE0

00 3

01 6

10 9

11 12

Source to

TX_IN

6-mil FR4 ≤ 20in

Source to

TX_IN

6-mil FR4 ≤ 20in

Measured differentially at the signal source (Note 1)

Measured differentially at the input of the MAX3983 (Note 1)

TX_OUT to

Load

1m, 28AWG 0 0

5m, 28AWG 0 1

10m, 24AWG 1 0

15m, 24AWG 1 1

TX_OUT to

Load

1m, 28AWG 0 0

5m, 28AWG 0 1

10m, 24AWG 1 0

15m, 24AWG 1 1

, single

TX_PE1 TX_PE0

800 1600 mV

42 50 58 Ω

0.10 0.15 UI

0.15 0.20 UI

1000 1600 mV

175 1600 mV

P-P

RMS

P-P

MAX3983

Quad Copper-Cable Signal Conditioner

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Swing

Output Resistance

Output Return Loss 100MHz to 2GHz (Note 1) 10 15 dB

Output Transition Time tr, tf20% to 80% (Notes 1, 8) 45 80 ps

Random Jitter (Notes 1, 8) 1.6 ps

Output Preemphasis

Residual Output Deterministic Jitter at 2.5Gbps (Notes 1, 5, 9, 10)

RX_ENABLE = high (Notes 1, 7) 1100 1500

RX_ENABLE = low 30

RX_OUT[1:4]+ or RX_OUT[1:4]- to V ended

RX_PE = low 3

RX_PE = high 6

Source to

RX_IN

5m, 28AWG IB Cable Assembly without preemphasis

RX_OUT to

Load

0in, 6-mil FR4 0

20in, 6-mil FR4 1

, single

RX_PE

42 50 58 Ω

0.10 0.15 UI

P-P

RMS

P-P

Source to

RX_IN

Residual Output Deterministic Jitter at 3.2Gbps (Notes 1, 5, 9, 10)

Signal-Detect Assert Level RX_IN for RX_SD = high (Note 11) 175 mV

Signal-Detect Off RX_IN for RX_SD = low (Note 11) 85 mV

END-TO-END JITTER (TX AND RX COMBINED PERFORMANCE)

Residual Output Deterministic

Jitter at 2.5Gbps

(Notes 1, 12, 13, 14)

5m, 28AWG IB cable assembly without preemphasis

Source to

TX_IN

6-mil FR4 ≤ 20in

RX_OUT to

Load

0in, 6-mil FR4 0

20in, 6-mil FR4 1

TX_OUT to

RX_IN

1m, 24AWG 0 0 0in 0

15m, 24AWG 1 1 20in 1

20m, 24AWG 1 1 20in 1 0.2 0.25

RX_PE

TX_PE1

TX_PE0

RX_OUT to Load

RX_PE

0.15 0.20 UI

P-P

MAX3983

Quad Copper-Cable Signal Conditioner

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless otherwise noted.)

Note 1: Guaranteed by design and characterization. Note 2: Measured with 2in of FR4 through InfiniBand connector with TX_PE1 = TX_PE0 =1. Note 3: Measured at the chip using 0000011111 or equivalent pattern. TX_PE1 = TX_PE0 = 0 for minimum preemphasis. Note 4: All channels under test are not transmitting during test. Channel tested with XAUI CJPAT, as well as this pattern: 19 zeros,

1, 10 zeros, 1010101010 (D21.5 character), 1100000101 (K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2 character), 0011111010 (K28.5- character).

Note 5: Cables are unequalized, Amphenol Spectra-Strip 24AWG and 28AWG or equivalent equipped with Fujitsu “MicroGiga”

connector or equivalent. All other channels are quiet. Residual deterministic jitter is the difference between the source jitter and the output jitter at the load. The deterministic jitter (DJ) at the output of the transmission line must be from mediainduced loss and not from clock-source modulation. Depending upon the system environment, better results can be achieved by selecting different preemphasis levels.

Note 6: Tested with a 1GHz sine wave applied at TX_IN under test with less than 5in of FR4. Note 7: Measured with 3in of FR4 with RX_PE = 1. Note 8: Measured at the chip using 0000011111 or equivalent pattern. RX_PE = low (minimum). Signal source is 1V

P-P

with 5m,

28AWG InfiniBand cable.

Note 9: All other receive channels are quiet. TX_ENABLE = 0. Channel tested with XAUI CJPAT as well as this pattern: 19 zeros,

1, 10 zeros, 1010101010 (D21.5 character), 1100000101 (K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2 character), 0011111010 (K28.5- character).

Note 10: FR4 board material: 6-mil-wide, 100Ω, edge-coupled stripline (tanδ = 0.022, 4.0 < ε

< 4.4).

Note 11: Tested with a 1GHz sine wave applied at RX_IN under test with less than 5in of FR4. Note 12: Channel tested with XAUI CJPAT as well as this pattern: 19 zeros, 1, 10 zeros, 1010101010 (D21.5 character), 1100000101

(K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2 character), 0011111010 (K28.5- character).

Note 13: Cables are unequalized, Amphenol Spectra-Strip 24AWG or equivalent equipped with Fujitsu “MicroGiga” connector or

equivalent. Residual deterministic jitter is the difference between the source jitter at point A and the load jitter at point B in Figure 2. The deterministic jitter (DJ) at the output of the transmission line must be from media-induced loss and not from clock-source modulation. Depending upon the system environment, better results can be achieved by selecting different preemphasis levels.

Note 14: Valid with pattern generator deterministic jitter as high as 0.17UI

P-P

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Source to

Residual Output Deterministic Jitter at 3.2Gbps (Notes 1, 12, 13, 14)

TX_IN

6-mil FR4 ≤ 20 in

TX_PE1

TX_PE0

TX_OUT to RX_IN

1m, 24AWG 0 0 5in 0

15m, 24AWG 1 1 20in 1

20m, 24AWG 1 1 20in 1 0.25 0.3

RX_PE

RX_OUT to Load

0.20 0.25 UI

P-P

MAX3983

Quad Copper-Cable Signal Conditioner

6 _______________________________________________________________________________________

Figure 1. Illustration of TX Preemphasis in dB

Figure 2. End-to-End Test Setup. The points labeled A and B are referenced for AC parameter test conditions.

PE = 12dB

EYE

= 0.375V

DIFFERENTIAL

P-P

OUTPUT = 1.5V

P-P

SIGNAL

SOURCE

PE = 3dB

6 mils

= 1.06V

EYE

P-P

END-TO-END TESTING

PC BOARD (FR4)

MAX3983

TX_IN TX_OUT

InfiniBand CABLE

ASSEMBLY

6 mils

1in ≤ L ≤ 20in 1in ≤ L ≤ 3in

FUJITSU

SMA CONNECTORS

1in ≤ L ≤ 20in

1in ≤ L ≤ 3in

MICROGIGA

CONNECTORS

MAX3983

6 mils

OSCILLOSCOPE OR

ERROR DETECTOR

RX_OUT RX_IN

6 mils

FR4

≤ 4.4

4.0 ≤ ε

tanδ = 0.022

+ 11 hidden pages