Maxim MAX3675EHJ, MAX3675ECJ, MAX3675E-D Datasheet

___________________________________________________ Typical Operating Circuit

_____________________ General Description

The MAX3675 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 MAX3675 has two differential input amplifiers: one
accepts PECL levels, while the other accepts small-sig­nal analog levels. The analog inputs access the limiting
amplifier stage, which provides both a received-signal­strength indicator (RSSI) and a programmable-threshold
loss-of-power (LOP) monitor. Selecting the PECL amplifier
disables the limiting amplifier, conserving power. A loss­of-lock (LOL) monitor is also incorporated as part of the
fully integrated PLL.

________________________Applications

SDH/SONET Transmission Systems
SDH/SONET Access Nodes
Add/Drop Multiplexers
ATM Switches
Digital Cross-Connects

____________________________Features

♦ Single +3.3V or +5.0V Power Supply
♦ Complies with ANSI, ITU, and Bellcore

SDH/SONET Specifications

♦ Low Power: 215mW at +3.3V
♦ Selectable Data Inputs, Differential PECL or

Analog

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

MAX3675

622Mbps, Low-Power, 3.3V Clock-Recovery

and Data-Retiming IC with Limiting Amplifier

________________________________________________________________

Maxim Integrated Products

1

V

CC

ZO = 50Ω

100Ω

100k

INREF

FILT

OUT+

C

IN

0.01µF

C

IN

0.01µF

C

OLC

33nF

C

F

47nF

+3.3V

220pF

100pF

PHOTO-

DIODE

ADI+

DDI-

DDI+

SDO+

SDO-

0.1µF

C

LOL

0.01µF

0.01µF

ADI-

CFILT OLC+ OLC-

R1

R2

GND

RSSI INV VTH LOP

LOL

INSEL

PHADJ+ PHADJ- FIL+

52.3Ω
1%

2.2µF

FIL-

OUT-

GND

COMP

IN

ZO = 50Ω

+3.3V

V

CC

SCLKO+

SCLKO-

ZO = 50Ω

ZO = 50Ω

+3.3V

+3.3V

82Ω

82Ω

130Ω 130Ω

ZO = 50Ω

ZO = 50Ω

+3.3V

82Ω

82Ω

130Ω 130Ω

MAX3675

MAX3664

19-1258; Rev 2; 11/98

PART

MAX3675ECJ -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

32 TQFP

_________________Ordering Information

Pin Configuration appears at end of data sheet.

*Contact factory for availability. Dice are designed to operate

from -40°C to +85°C, but are tested and guaranteed only at
Tj= +45°C.

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

EVALUATION KIT MANUAL

AVAILABLE

MAX3675EHJ -40°C to +85°C 5mm 32 TQFP
MAX3675E/D -40°C to +85°C Dice*

MAX3675

622Mbps, Low-Power, 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 (VCC+ 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 +160°C

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

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

1MΩ between INV and VTH

MAX3675ECJ,
PECL outputs
unterminated

1MΩ between INV and VTH

C

LOL

= 0.01µF

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

ADI+, ADI- open

CONDITIONS

V1.10 1.18 1.30INV Input Bias Voltage

nA-100 +100Op-Amp Input Bias Current

VRSSI Output Voltage 2.00 2.12 2.30

1.22

VVCC- 0.7 VCC- 0.6 VCC- 0.5ADI+, ADI- Input Bias Voltage

VVCC- 1.16 VCC- 0.88V

IH

PECL Input High Voltage

47 65

65 90

V0.44V

OL

LOL Low Voltage

V0.1 0.4V

OL

LOP Low Voltage

V2.4V

OH

LOP, LOL High Voltage

VVCC- 1.81 VCC- 1.620V

OL

PECL Output Low Voltage

VVCC- 1.81 VCC- 1.48V

IL

PECL Input Low Voltage

µA-10 10I

IH

PECL Input High Current

µA-10 10I

IL

PECL Input Low Current

VVCC- 1.03 VCC- 0.88V

OH

PECL Output High Voltage

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

(ADI+) - (ADI-) = 80mVp-p 2.38 2.51 2.70

CF= 0.022µF

MAX3675

622Mbps, Low-Power, 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 MAX3675 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: Small-signal bandwidth cannot be measured directly.
Note 8: RSSI slope = [V

RSSI2

- V

RSSI1

] / [20log (V

ID2

/ V

ID1

)]

Note 9: 1UI = 1 unit interval = (622.08MHz)

-1

= 1.608ns

PARAMETER SYMBOL MIN TYP MAX UNITS

RSSI Output Voltage

1.36

Limiting Amplifier Small-Signal Bandwidth BW 800 MHz

Power-Detect Hysteresis 23 5 dB

Input Referred Noise V

N

100 µV

Threshold Voltage V

TH

1.40 V

13

mUI

Differential Input Voltage Range V

ID

0.003 1.2000 Vp-p

Jitter Generation (Note 9)

6

CONDITIONS

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

(Note 7)

V

RELEASE

= 3.6mVp-p (Note 6)

ADI inputs

V

RELEASE

= 3.6mVp-p

CF= 2.2µF, RF= 52.3Ω

BER < 10

-10

, ADI inputs (Note 5)

1.93

V

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

Jitter-Transfer Peaking 0.08 dB

Maximum Consecutive Input
Run Length (1 or 0)

1000 Bits

Serial Clock-to-Q Delay t

CLK-Q

195 275 370 ps

Serial Clock Frequency f

SCLK

622.08 MHz

RF= 52.3Ω, CF= 2.2µF

8

RF= 52.3Ω,
CF= 2.2µF

1.50 3.35

Jitter Tolerance (Note 9)

0.25 0.60

0.20 0.50

3.5 MHz

CF= 2.2µF, RF= 52.3Ω

Loop Bandwidth

350 kHz

29

RSSI Linearity ±0.7 %(ADI+) - (ADI-) = 2mVp-p to 50mVp-p
RSSI Slope mV/dB

(ADI+) - (ADI-) = 2mVp-p to
50mVp-p (Note 8)

UI

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

CF= 0.022µF, RF= 523Ω

CF= 0.022µF, RF= 523Ω

MAX3675

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

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

380ps/div

CLOCK

DATA

RECOVERED DATA AND
CLOCK (SINGLE ENDED)

MAX3675 TOC01

JITTER FREQUENCY (Hz)

2

23

-1 PATTERN

V

CC

= +3.3V

RF = 520Ω
C

F

= 0.022µF

20ps/div

RECOVERED CLOCK JITTER

MAX3675 TOC02

JITTER FREQUENCY (Hz)

2

23

-1 PATTERN

V

CC

= +3.3V

R

F

= 520Ω

C

F

= 0.022µF

RMS∆ = 12.8ps

10

-2

10

-3

10

-4

10

-5

10

-6

10

-7

10

-8

10

-9

10

-10

600µ 800µ700µ 900µ 1m 1.1m 1.2m 1.3m

BIT ERROR RATE

vs. INPUT VOLTAGE

MAX3675 TOC03

INPUT VOLTAGE (Vp-p)

BIT ERROR RATE

2

23

-1 PATTERN

V

CC

= +3.3V

10

0.1
10k 100k 1M

JITTER TOLERANCE

MAX3675 TOC04

JITTER FREQUENCY (Hz)

INPUT JITTER (UIp-p)

1

2

23

-1 PATTERN

V

CC

= +3.3V

R

F

= 52.3Ω

C

F

= 2.2µF

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

MAX3675 TOC05

JITTER FREQUENCY (Hz)

JITTER TRANSFER (dB)

2

23

-1 PATTERN

V

CC

= +3.3V
RF = 52.3Ω
CF = 2.2µF

BELLCORE
MASK

MAX3675

622Mbps, Low-Power, 3.3V Clock-Recovery

and Data-Retiming IC with Limiting Amplifier

_______________________________________________________________________________________ 5

____________________________Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

2.0

2.6

2.4

2.2

2.8

3.0

3.2

3.4

3.6

3.8

4.0

-40 0-20 20 40 60 80

LOSS-OF-POWER

HYSTERESIS vs. TEMPERATURE

MAS3675 TOC06

AMBIENT TEMPERATURE (°C)

HYSTERESIS (dB)

2

23

-1 PATTERN

V

CC

= +3.3V OR +5.0V

2.8

1.2
100µ 10m 100m1m 1

RECEIVED-SIGNAL-STRENTH INDICATOR

vs. INPUT VOLTAGE

1.4

1.6

MAX3675 TOC07

INPUT VOLTAGE (Vp-p)

RSSI (V)

1.8

2.0

2.2

2.4

2.6

V

CC

= +3.3V

2

23

-1 PATTERN

1010 PATTERN

100m

1m

1.3 2.52.42.32.22.12.01.91.81.71.61.51.4

LOSS-OF-POWER

ASSERT AND RELEASE LEVEL

vs. THRESHOLD VOLTAGE

MAX4108/9-08

DETECTOR THRESHOLD VOLTAGE, VTH (V)

ANALOG INPUT VOLTAGE (Vp-p)

10m

LOP RELEASE

LOP ASSERT

2

23

-1 PATTERN

V

CC

= +3.3V

2.8

1.2

100µ 10m 100m1m 1

RECEIVED-SIGNAL-STRENGTH INDICATOR

vs. INPUT VOLTAGE

1.4

1.6

MAX3675 TOC09

INPUT VOLTAGE (Vp-p)

RSSI (V)

1.8

2.0

2.2

2.4

2.6

V

CC

= 5.0V

V

CC

= 3.3V

2

23

-1 PATTERN

30

50

40

70

60

80

90

-40 0 20-20 40 60 80

SUPPLY CURRENT
vs. TEMPERATURE

MAX3675 TOC10

AMBIENT TEMPERATURE (°C)

SUPPLY CURRENT (mA)

V

CC

= 3.3V

V

CC

= 5.0V