Maxim MAX3875E-D Datasheet

General Description

The MAX3875 is a compact, low-power clock recovery
and data retiming IC for 2.488Gbps SDH/SONET appli­cations. The fully integrated phase-locked loop recov­ers a synchronous clock signal from the serial NRZ
data input, which is retimed by the recovered clock.
Differential PECL-compatible outputs are provided for
both clock and data signals, and an additional

2.488Gbps serial input is available for system loopback
diagnostic testing. The device also includes a TTL­compatible loss-of-lock (LOL) monitor.

The MAX3875 is designed for both section-regenerator
and terminal-receiver applications in OC-48/STM-16
transmission systems. Its jitter performance exceeds all
of the SONET/SDH specifications.

This device operates from a single +3.3V to +5.0V supply
over a -40°C to +85°C temperature range. The typical
power consumption is only 400mW with a +3.3V supply. It is
available in a 32-pin TQFP package, as well as in die form.

Applications

SDH/SONET Receivers and Regenerators
Add/Drop Multiplexers
Digital Cross-Connects

2.488Gbps ATM Receiver
Digital Video Transmission
SDH/SONET Test Equipment

Features

♦ Exceeds ANSI, ITU, and Bellcore SONET/SDH

Regenerator Specifications

♦ 400mW Power Dissipation (at +3.3V)
♦ Clock Jitter Generation: 0.003UI

RMS

♦ Single +3.3V or +5V Power Supply
♦ Fully Integrated Clock Recovery and Data Retiming
♦ Additional High-Speed Input Facilitates System

Loopback Diagnostic Testing

♦ Tolerates >2000 Consecutive Identical Digits
♦ Loss-of-Lock Indicator
♦ Differential PECL-Compatible Data and Clock

Outputs

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

MAX3875

2.5Gbps, Low-Power, +3.3V

Clock Recovery and Data Retiming IC

________________________________________________________________

Maxim Integrated Products

1

PRE/POSTAMPLIFIER

PHOTO­DIODE

+3.3V

SDI-

SDI+

SLBI­SLBI+

SDO-

SCLKO+

SCLKO-

SDO+

MAX3875

MAX3866

+3.3V

+3.3V

+3.3V

+3.3V

OUT+

OUT-

TTL

LOP

IN

LOLPHADJ-PHADJ+V

CC

V

CC

SIS FIL+ FIL-

SYSTEM

LOOPBACK

TTL

TTL

1µF

0.01µF

0.01µF

82Ω 82Ω

130Ω 130Ω

82Ω 82Ω

130Ω 130Ω

1:16

DESERIALIZER

MAX3885

Typical Application Circuit

19-4789; Rev 0; 10/98

PART

MAX3875EHJ -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

32 TQFP

Ordering Information

Pin Configuration appears at end of data sheet.

MAX3875E/D -40°C to +85°C Dice*

*

Dice are designed to operate over this range, but are tested
and guaranteed at TA= +25°C only. Contact factory for
availability.

MAX3875

2.5Gbps, Low-Power, +3.3V
Clock Recovery and Data Retiming IC

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 +3.3V and TA= +25°C.) (Note 1)

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 +7.0V

Input Voltage Levels

(SDI+, SDI-, SLBI+, SLBI-)...........(V

CC

- 0.5V) to (VCC+ 0.5V)

Input Current Levels (SDI+, SDI-, SLBI+, SLBI-)..............±10mA

PECL Output Voltage

(SDO+, SDO-, SCLKO+, SCLKO-).......................(V

CC

+ 0.5V)

PECL Output Current, (SDO+, SDO-, SCLKO+, SCLKO-).....56mA

Voltage at LOL, SIS, PHADJ+, PHADJ-,

FIL+, FIL-.................................................-0.5V to (V

CC

+ 0.5V)

Continuous Power Dissipation (T

A

= +85°C)

TQFP (derate 16.1mW/°C above +85°C)........................1.0W

Operating Temperature Range

MAX3875EHJ..................................................-40°C to +85°C

Operating Junction Temperature (die)..............-55°C to +150°C

Storage Temperature Range.............................-60°C to +160°C

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

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

Figure 1

Excluding PECL output termination

TA= 0°C to +85°C

TA= 0°C to +85°C

CONDITIONS

VVCC- 0.4 VCC+ 0.2V

IS

Single-Ended Input Voltage
(SDI±, SLBI±)

mVp-p50 800 V

ID

mA122 167I

CC

Supply Current
Differential Input Voltage

(SDI±, SLBI±)

V2.4 V

CC

V

OH

TTL Output High Voltage (LOL)

µA-10 +10TTL Input Current (SIS)

V0.8V

IL

TTL Input Low Voltage (SIS)

Ω45R

IN

Input Termination to V

CC

(SDI±, SLBI±)

V

VCC- 1.025 VCC- 0.88

V

OH

PECL Output High Voltage
(SDO±, SCLKO±)

V

VCC- 1.81 VCC- 1.62

V

OL

PECL Output Low Voltage
(SDO±, SCLKO±)

V2.0V

IH

TTL Input High Voltage (SIS)

UNITSMIN TYP MAXSYMBOLPARAMETER

TTL Output Low Voltage (LOL)

V

OL

0.4 V

VCC- 1.085 VCC- 0.88

VCC- 1.83 VCC- 1.555

TA = -40°C

TA = -40°C

Figure 1. Input Amplitude Figure 2. Output Clock-to-Q Delay

SCLKO+

SDO

t

CK

t

CK-Q

Note 1: Dice are tested at TA= +25°C only.

SDI+

SDI-

(SDI+) -

(SDI-)

V

ID

25mV MIN
400mV MAX

50mVp-p MIN
800mVp-p MAX

MAX3875

2.5Gbps, Low-Power, +3.3V

Clock Recovery and Data Retiming IC

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at +3.3V and TA= +25°C.) (Note 2)

Clock Output Edge Speed 20% to 80%

f ≤ 2MHz

70 ps

Figure 2

1.76 2.75

0.21 0.45

f = 100kHz

f = 10MHz (Note 3)

f = 70kHz

f = 1MHz

CONDITIONS

dB0.1J

P

Jitter Peaking

ps110 290

Gbps2.488Serial Output Clock Rate

Clock-to-Q Delay

UIp-p0.026 0.056

UI

RMS

0.003 0.006

J

GEN

Jitter Generation

MHz1.1 2.0J

BW

Jitter Transfer Bandwidth

UIp-p

1.91 3.6

Jitter Tolerance

0.41 0.67

UNITSMIN TYP MAXSYMBOLPARAMETER

Data Output Edge Speed 20% to 80% 108 ps
Tolerated Consecutive

Identical Digits

2000

Bits

100kHz to 2.5GHz -17

2.5GHz to 4.0GHz -15

Jitter BW = 12kHz to 20MHz

Note 2: AC characteristics are guaranteed by design and characterization.
Note 3: See

Typical Operating Characteristics

for worst-case distribution.

Input Return Loss
(SDI±, SLBI±)

dB

Typical Operating Characteristics

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

RECOVERED CLOCK JITTER

MAX3875 toc02

10ps/div

PRBS = 2

15

- 1

RMS∆ = 1.2ps

0.1
10k 10M100k 1M

JITTER TOLERANCE

1

10

MAX3875 toc03

JITTER FREQUENCY (Hz)

INPUT JITTER (UIp-p)

PRBS = 223 - 1
50mVp-p INPUT

BELLCORE
MASK

RECOVERED DATA AND CLOCK

(DIFFERENTIAL OUTPUT)

MAX3875 toc01

100ps/div

CLOCK

DATA

2

23

- 1 PATTERN

V

IN

= 20mV

P-P

TA = +85°C