MAXIM MAX3802 Technical data

General Description

The MAX3802 has four independent adaptive cable
equalizers and cable drivers on a single chip. It is
designed for coaxial and twin-axial cable point-to-point
scrambled-data communication applications. The dri­ver features differential current-mode logic (CML)
inputs and outputs. The equalizer includes differential
CML data inputs and outputs and a TTL loss-of-signal
(LOS) output.

The adaptive cable equalizer can equalize differential
or single-ended signals at data rates up to 3.2Gbps. It
automatically adjusts to attenuation caused by skin­effect losses of 30dB at 1.6GHz. The equalizer effec­tively extends the usable length of copper cable in
high-frequency interconnect applications.

Applications

High-Speed Links in Communications and Data
Systems

Backplane and Twin-Axial Cable Interconnects

Category 5 UTP-Based Systems

Digital Video Systems

Features

♦ Single 3.3V Operation

♦ Four Independent Equalizers and Drivers

♦ 725mW at 3.3V Typical Power Dissipation

♦ Data Rates Up to 3.2Gbps

♦ Equalizer Automatically Adjusts for Different

Cable Lengths

♦ 0 to 30dB Equalization at 1.6GHz (3.2Gbps)
♦ Loss-of-Signal (LOS) Indicator

♦ On-Chip Input and Output Terminations

♦ Low External Component Count

♦ 0°C to +85°C Operating Temperature Range

♦ ESD Protection on Cable Inputs and Outputs

MAX3802

3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

Typical Application Circuit

19-2289; Rev 2; 11/06

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.

Pin Configuration appears at end of data sheet.

+Denotes lead-free package.

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE
CODE

MAX3802UGK

68 QFN G6800-2

MAX3802UTK+

68 QFN T6800-4

DOUT_

EIN_

DIN_

EOUT_

MAX3802

DOUT_

EIN_

DIN_

THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

EOUT_

RMOD_

CIM_

MAX3802

CARD 2

CARD 1

3.3V

LOS_

RMOD_

CIM_

LOS_

EP* V

CC

4

4

4

4

4

4

4 4 4

R

MOD_

COAX, TWIN-AX, OR PC BOARD x 4

COAX, TWIN-AX, OR PC BOARD x 4

*EP MUST BE SOLDERED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE.

3.3V

EP* V

CC

R

MOD

_

4 4 4

4

4

PACKAGE

0°C to +85°C

0°C to +85°C

MAX3802

3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(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.)

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

Voltage at LOS_, CIM_, and RMOD_ .........-0.5V to (V

CC

+ 0.5V)

Voltage at EIN_+, EIN_-,

DIN_+, and DIN_- ..........................(V

CC

- 1V) to (V

CC

+ 0.5V)

Current Out of EOUT_+, EOUT_-,

DOUT_+, and DOUT_- ...................................................25mA

Continuous Power Dissipation (T

A

= +85°C)

68-Pin QFN (derate 44.8mW/°C above +85°C) .............1.44W

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

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

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS

UNITS

Supply Current I

CC

Includes external load current (Note 1)

mA

CABLE DRIVER INPUT SPECIFICATIONS

Input Voltage (Single Ended)

0.6

0.2

V

Input Voltage (Differential) V

DIN_

mV

P-P

Input Impedance Single ended 40 50 60 Ω

CABLE DRIVER OUTPUT SPECIFICATIONS

RMOD_ = 10kΩ (Note 2)

Output Voltage (Differential)

RMOD_ = 20kΩ (Note 2)

mV

P-P

Output Impedance Single ended 50

75 Ω

CABLE EQUALIZER INPUT SPECIFICATIONS

Minimum Cable Input
(Differential)

3.2Gbps, 30dB cable loss (Note 3)

mV

P-P

Maximum Cable Input
(Differential)

mV

P-P

Input Impedance 40 50 60 Ω

CABLE EQUALIZER OUTPUT SPECIFICATIONS

Output Voltage (Differential) (Note 2)

mV

P-P

Output Impedance Single ended 50

75 Ω

Output high (Note 4) 2.4

Voltage at LOS_

Output low (Note 4) 0.4

V

SYMBOL

V

+,

DIN_

V

-

DIN_

MIN TYP MAX

220 345

-

V

CC

400 1100

V

CC

+

750 825 1000

400 445 550

62.5

600

500 1000

62.5

400

MAX3802

3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(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.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Input Data Rate 3.2

Gbps

CABLE DRIVER SPECIFICATIONS

Random Jitter 3.2Gbps input 2.7 4

mUI

RMS

Deterministic Jitter (Notes 6, 9) 20 60

mUI

P-P

Output Edge Speed 20% to 80% 60 90 ps

Input Return Loss
(Differential)

≤ 2.5GHz -20 dB

Output Return Loss
(Differential)

≤ 2.5GHz -13 dB

EQUALIZER SPECIFICATIONS

0dB cable loss (Note 8)

24dB cable loss (Note 8)

Residual Jitter (Notes 7, 9)

30dB cable loss (Note 8)

UI

P-P

Output Edge Speed 20% to 80% 60 90 ps

Input Return Loss
(Differential)

≤ 2.5GHz -16 dB

Output Return Loss
(Differential)

≤ 2.5GHz -14 dB

Equalizer Compensation 1.6GHz (skin-effect losses only) 30 dB

Equalizer Time Constant (Note 10) 6 µs

Note 1: Equalizer total currents (equalizer with maximum equalization) and R

MOD

= 10kΩ (maximum driver swing).

Note 2: Input voltage within specification limits, 50Ω to V

CC

at each output.

Note 3: Minimum cable input for LOS_ to deassert high.
Note 4: 100kΩ load to ground. The minimum input signal level that turns off the LOS_ alarm depends on the data rate and cable length.
Note 5: AC electrical characteristics are guaranteed by design and characterization.
Note 6: V

DIN_

= 400mV

P-P

to 1100mV

P-P

(differential), 10kΩ≤R

MOD_

≤ 20kΩ, 3.2Gbps 213-1 PRBS plus 100 consecutive ones and

100 consecutive zeros.

Note 7: Includes random jitter and deterministic jitter for BER of 10

-12

.

Note 8: Differential cable input voltage = 400mV

P-P

, 3.2Gbps 213-1 PRBS plus 100 consecutive ones and 100 consecutive zeros.

Note 9: Isolation test: three channels driven with identical 3.2Gbps PRBS with maximum input signal to each equalizer and maxi-

mum input signal on driver. The measured channel meets the residual and random jitter specifications with an uncorrelated

3.2Gbps PRBS data at minimum input signal level on equalizer and maximum signal level on driver.

Note 10: Equalizer time constant measured from data on to closed-loop operation.

0.10 0.24

0.11 0.20

0.08 0.20

MAX3802

3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3.3V, TA= +25°C, all jitter measurements done at 3.2Gbps, 600mV cable input with 2

13

- 1 PRBS pattern with 100 consecutive ones and

100 consecutive zeros substituted. Note: Test pattern produces near-worst-case jitter results. Results vary with pattern, unless otherwise noted.)

150

180

240

210

270

300

-10 3010 50 70 90

SUPPLY CURRENT vs. TEMPERATURE

MAX3802 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

RMOD = 15kΩ
ALL CHANNELS AT
MAX EQUALIZATION

400

600

500

900

800

700

1200

1100

1000

1300

4107 13161922

CABLE DRIVER OUTPUT vs. R

MOD

MAX3802 toc02

R

MOD

(kΩ)

DRIVER OUTPUT VOLTAGE (mV)

-50

-20

-30

-40

-10

0

10

20

30

40

50

01.60.8 2.4 3.2 4.0

DRIVER INPUT RETURN LOSS (S11)

MAX3802 toc03

FREQUENCY (GHz)

GAIN (dB)

-50

-20

-30

-40

-10

0

10

20

30

40

50

01.60.8 2.4 3.2 4.0

DRIVER OUTPUT RETURN LOSS (S22)

MAX3802 toc04

FREQUENCY (GHz)

GAIN (dB)

-50

-20

-30

-40

-10

0

10

20

30

40

50

01.60.8 2.4 3.2 4.0

EQUALIZER INPUT RETURN LOSS (S11)

MAX3802 toc05

FREQUENCY (GHz)

GAIN (dB)

-50

-20

-30

-40

-10

0

10

20

30

40

50

01.60.8 2.4 3.2 4.0

EQUALIZER OUTPUT RETURN LOSS (S22)

MAX3802 toc06

FREQUENCY (GHz)

GAIN (dB)

45

55

75

65

85

95

0.001 0.10.01 1 10 100

EQUALIZER RESIDUAL JITTER vs. POWER-SUPPLY

NOISE (100mV

P-P

SINE WAVE) (40ft OF TENSOLITE

TWIN-AX, 400mV

P-P

DIFFERENTIAL INPUT)

MAX3802 toc07

NOISE FREQUENCY (MHz)

JITTER (ps

P-P

)

45

55

65

75

85

95

105

115

125

150 450300 600 750 900

EQUALIZER RESIDUAL JITTER vs. CABLE

INPUT AMPLITUDE (RG179B 75Ω COAXIAL

CABLE, SINGLE ENDED)

MAX3802 toc08

CABLE INPUT AMPLITUDE (mV

P-P

)

JITTER (ps

P-P

)

25ft

72ft

35

55

45

75

65

95

85

105

300 600 750450 900 1050 1200

EQUALIZER RESIDUAL JITTER vs. CABLE

INPUT AMPLITUDE (TENSOLITE

TWIN-AX–DIFFERENTIAL)

MAX3802 toc09

CABLE DIFFERENTIAL INPUT AMPLITUDE (mV

P-P

)

JITTER (ps

P-P

)

70ft

10ft

40ft