Maxim MAX3676EHJ, MAX3676E-D Datasheet

___________________________________________________ Typical Operating Circuit

_____________________ General Description

The MAX3676 is a complete clock-recovery and data­retiming IC incorporating a limiting amplifier. It is intend­ed for 622Mbps SDH/SONET applications and operates
from a single +3.3V supply.

The MAX3676 is designed for both section-regenerator
and terminal-receiver applications in OC12/STM-4 trans­mission systems. Its jitter performance exceeds all
SONET/SDH specifications.

The MAX3676 has two differential input amplifiers: one
accepts positive-referenced emitter-coupled logic
(PECL) levels, while the other accepts small-signal ana­log levels. The analog inputs access the limiting amplifi­er stage, which provides both a received-signal-strength
indicator (RSSI) and a programmable-threshold loss-of­power (LOP) monitor. Selecting the PECL amplifier dis­ables the limiting amplifier, conserving power. A
loss-of-lock (LOL) monitor is also incorporated as part of
the fully integrated phase-locked loop (PLL).

________________________Applications

SDH/SONET Receivers and Regenerators
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects

____________________________Features

♦ Single +3.3V or +5.0V Power Supply
♦ Exceeds ITU/Bellcore SDH/SONET Regenerator

Specifications

♦ Low Power: 237mW at +3.3V
♦ Selectable Data Inputs, Differential PECL or

Analog

♦ Received-Signal-Strength Indicator
♦ Loss-of-Power and Loss-of-Lock Monitors
♦ Differential PECL Clock and Data Outputs
♦ No External Reference Clock Required

MAX3676

622Mbps, 3.3V Clock-Recovery and

Data-Retiming IC with Limiting Amplifier

________________________________________________________________

Maxim Integrated Products

1

19-1537; Rev 0; 7/99

PART TEMP. RANGE PIN-PACKAGE

_________________Ordering Information

Pin Configuration appears at end of data sheet.

*Contact factory for availability. Dice are designed to operate

over a -40°C to +140°C junction temperature (T

j

) range, but are

tested and guaranteed at Tj= +45°C.

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

MAX3676EHJ

-40°C to +85°C 5mm 32 TQFP

MAX3676E/D -40°C to +85°C Dice*

+3.3V

130Ω 130Ω

82Ω

130Ω 130Ω

82Ω

82Ω

+3.3V

82Ω

100pF

PHOTO-

DIODE

FILT

INREF

IN

GND

MAX3664

+3.3V

V

CC

OUT+

OUT-

COMP

220pF

0.01µF

ZO = 50Ω

ZO = 50Ω

100Ω

+3.3V

C

IN

0.01µF

C

IN

0.01µF

C

47nF

0.1µF

F

+3.3V

PHADJ+ PHADJ-

INSEL

DDI+

DDI-

ADI+

ADI-

V

CC

CFILT OLC+ OLC-

C

OLC

33nF

FIL+

MAX3676

GND

RSSI INV VTH LOP

2.2µF

R1
20k

C

LOL

0.01µF

LOL

FIL-

SDO+

SDO-

SCLKO+

SCLKO-

R2

ZO = 50Ω

ZO = 50Ω

ZO = 50Ω

ZO = 50Ω

MAX3676

622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 1, 2)

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 +6.5V

Input Voltage Levels,

DDI+, DDI-, ADI+, ADI-...........................-0.5V to (V

CC

+ 0.5V)

Input Differential Voltage (ADI+) - (ADI-)...............................±3V

PECL Output Currents, SDO+, SDO-, SCLKO+, SCLKO-...100mA

LOL, LOP, INSEL, PHADJ+, PHADJ-.........-0.5V to (V

CC

+ 0.5V)

FIL+, FIL-, OLC+, OLC-, RSSI, VTH...........-0.5V to (V

CC

+ 0.5V)

(OLC+) - (OLC-).....................................................................±3V

(FIL+) - (FIL-) ..................................................................±700mV

CFILT...............................................(V

CC

- 2.5V) to (VCC+ 0.5V)

INV.........................................................................-0.5V to +2.0V

Continuous Power Dissipation (T

A

= +85°C)

TQFP (derate 11.1mW/°C above +85°C).....................721mW

Operating Junction Temperature Range...........-40°C to +150°C

Storage Temperature Range .............................-65°C to +150°C

Processing Temperature (die) .........................................+400°C

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

MAX3676EHJ,
PECL outputs
unterminated

TA= 0°C to +85°C

TA= 0°C to +85°C

CONDITIONS

VVCC- 1.16 VCC- 0.88V

IH

PECL Input Voltage High

51 81

72 111

V0.1 0.4V

OL

LOP, LOL Voltage Low

V2.4V

OH

LOP, LOL Voltage High

VCC- 1.81 VCC- 1.620

VVCC- 1.81 VCC- 1.48V

IL

PECL Input Voltage Low

µA-10 10I

IH

PECL Input Current High

µA-10 10I

IL

PECL Input Current Low

VCC- 1.025 VCC- 0.88

UNITSMIN TYP MAXSYMBOLPARAMETER

INSEL = V

CC

INSEL = GND

Note 1: Dice are tested at Tj= +45°C, VCC= +4.25V.
Note 2: At T

A

= -40°C, DC characteristics are guaranteed by design and characterization.

mAI

CC

Supply Current

TA= -40°C

V

VCC- 1.085 VCC- 0.88

V

OH

PECL Output Voltage High

TA= -40°C

V

VCC- 1.83 VCC- 1.555

V

OL

PECL Output Voltage Low

4kΩ between INV and VTH V1.10 1.23 1.30INV Input Bias Voltage

MAX3676

622Mbps, 3.3V Clock-Recovery and

Data-Retiming IC with Limiting Amplifier

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.)
(Notes 3, 4)

Note 3: AC parameters are guaranteed by design and characterization.
Note 4: The MAX3676 is characterized with a PRBS of 2

23

- 1 maintaining a BER of ≤ 10

-10

having a confidence level of 99.9%.

Note 5: A lower minimum input voltage of 2mVp-p is achievable; however, the LOP hysteresis is not guaranteed below 3.6mVp-p.
Note 6: Hysteresis = 20log(V

RELEASE

/ V

ASSERT

).

Note 7: R

1

= 20kΩ, R

2 =

3.0kΩ, resulting in V

RELEASE

≈ 3.6mVp-p.

Note 8: Small-signal bandwidth cannot be measured directly.
Note 9: RSSI slope = [V

RSSI2

- V

RSSI1

] / [20log (V

ID2

/ V

ID1

)].

Note 10: 1UI = 1 unit interval = (622.08MHz)

-1

= 1.608ns.

Note 11: At jitter frequencies <10kHz, the jitter tolerance characteristics exceed the ITU/Bellcore specifications. The low-frequency

jitter tolerance outperforms the instrument’s measurement capability.

Note 12: See

Typical Operating Characteristics

for worst-case distribution.

PARAMETER SYMBOL MIN TYP MAX UNITS

RSSI Output Voltage

1.40

Limiting Amplifier Small­Signal Bandwidth

BW

650

MHz

Power-Detect Hysteresis

36

dB

Input-Referred Noise V

N

80

µV

RMS

Threshold Voltage V

TH

1.41

V

Differential Input Voltage
Range

V

ID

0.003 1.2000

Vp-p

CONDITIONS

(ADI+) - (ADI-) = 2mVp-p

(Note 8)

(Notes 6, 7)

ADI inputs

(Note 7)

BER < 10

-10

, ADI inputs (Note 5)

1.93

V

(ADI+) - (ADI-) = 20mVp-p

Jitter-Transfer Peaking

0.03 0.08

dB

Maximum Consecutive Input
Run Length (1 or 0)

1200

Bits

CF= 2.2µF

8.9

CF= 2.2µF

(Note 12) 3.64

Jitter Tolerance (Note 11)

0.55 0.77

0.45 0.69

CF= 2.2µFLoop Bandwidth

250 500

kHz

26

RSSI Linearity

±0.7

%(ADI+) - (ADI-) = 2mVp-p to 50mVp-p

RSSI Slope mV/dB

(ADI+) - (ADI-) = 2mVp-p to 50mVp-p
(Note 9)

UI

f =10kHz
f =25kHz
f = 250kHz
f =1MHz

CF= 2.2µFJitter Generation (Note 10)

2.0 2.6

mUI

LOP Threshold Accuracy

-2 +2

dB(Note 7)

Clock Transition Time tr, tf

205 245

ps20% to 80%

Data Transition Time tr, tf

180 230

ps20% to 80%

Serial Clock-to-Q Delay t

CLK-Q

140 275 400

ps

Serial Clock Frequency f

SCLK

622.08

MHz

MAX3676

622Mbps, 3.3V Clock-Recovery and
Data-Retiming IC with Limiting Amplifier

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= +3.3V, TA = +25°C, unless otherwise noted.)

400ps/div

CLOCK

DATA

RECOVERED DATA AND
CLOCK (SINGLE ENDED)

MAX3676 toc01

2

23

-1 PATTERN

20ps/div

RECOVERED CLOCK JITTER

MAX3676 toc02

2

23

-1 PATTERN

WIDEBAND RMS
JITTER = 5.84ps

10

-2

10

-3

10

-4

10

-5

10

-6

10

-7

10

-8

10

-9

10

-10

10

-11

10

-12

600µ500µ400µ 800µ700µ 900µ 1m 1.1m 1.2m

BIT ERROR RATE

vs. ADI INPUT VOLTAGE

MAX3676 toc03

INPUT VOLTAGE (V)

BIT ERROR RATE

2

23

-1 PATTERN

10

0.1
10k 100k 1M 10M

JITTER TOLERANCE

MAX3676 toc04

JITTER FREQUENCY (Hz)

INPUT JITTER (UIp-p)

1

2

23

-1 PATTERN

BELLCORE
MASK

0.2
0

-0.2

-0.4

-0.6

-0.8

-1.0

-1.2

-1.4

-1.6

-1.8

-2.0

-2.2

-2.4

-2.6

-2.8

-3.0
2k 10k 100k 700k

JITTER TRANSFER

MAX3676 toc05

JITTER FREQUENCY (Hz)

JITTER TRANSFER (dB)

2

23

- 1 PRBS

BELLCORE
MASK

0

10

5

20

15

25

30

1.5

2.4

2.0

2.2

3.02.6

2.8

3.5

DISTRIBUTION OF JITTER TOLERANCE

(WORST-CASE CONDITIONS)

MAX3676 toc06

JITTER TOLERANCE (UI

p-p

)

PERCENT OF UNITS (%)

f

JITTER

= 25kHz

V

CC

= +3.0V

T

A

= +85°C

MEAN = 2.42UI
σ = 0.227UI

MAX3676

622Mbps, 3.3V Clock-Recovery and

Data-Retiming IC with Limiting Amplifier

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= +3.3V, TA = +25°C, unless otherwise noted.)

2.0

3.0

2.5

3.5

4.0

4.5

5.0

-40 0-20 20 40 60 80 100

LOSS-OF-POWER

HYSTERESIS vs. TEMPERATURE

MAS3676 toc07

AMBIENT TEMPERATURE (°C)

HYSTERESIS (dB)

2

23

-1 PATTERN

V

CC

= +3.3V OR +5.0V

RECEIVED-SIGNAL-STRENGTH INDICATOR

vs. INPUT VOLTAGE

2.7

1.1

0.1 10 1001.0 1000

1.3

1.5

MAX3676 toc08

INPUT VOLTAGE (mVp-p)

RSSI (V)

1.7

1.9

2.1

2.3

2.5

2

23

-1 PATTERN

1010 PATTERN

100

1

1.31.2 2.42.32.22.12.01.91.81.71.61.51.4

LOSS-OF-POWER

ASSERT AND RELEASE LEVEL

vs. DETECTOR THRESHOLD VOLTAGE

MAX3676 toc09

DETECTOR THRESHOLD VOLTAGE, VTH (V)

ANALOG VOLTAGE (mVp-p)

10

LOP RELEASE

LOP ASSERT

2

23

-1 PATTERN

2.7

1.1

0.1 10 1001.0 1000

RECEIVED-SIGNAL-STRENGTH INDICATOR

vs. INPUT VOLTAGE

1.3

1.5

MAX3676 toc10

INPUT VOLTAGE (mVp-p)

RSSI (V)

1.7

1.9

2.1

2.3

2.5

2

23

-1 PATTERN

V

CC

= +3.3V OR +5.0V

30

50

40

70

60

80

90

100

-40 0 20-20 40 60 80 100

SUPPLY CURRENT
vs. TEMPERATURE

MAX3676 toc11

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

V

CC

= +5.0V

V

CC

= +3.3V