Maxim MAX3876E-D, MAX3876EHJ Datasheet

General Description

The MAX3876 is a compact, low-power clock recovery
and data retiming IC for 2.488Gbps SDH/SONET appli­cations. The fully integrated phase-locked loop (PLL)
recovers a synchronous clock signal from the serial
NRZ data input. The data is retimed by the recovered
clock. Differential CML 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 TTL-compatible
loss-of-lock (LOL) monitor.

The MAX3876 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 +3.3V or +5.0V single sup­ply over a -40°C to +85°C temperature range. Power
consumption is typically only 445mW with a +3.3V sup­ply. The MAX3876 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

Intrarack/Subrack Interconnects

Features

♦ Exceeds ANSI, ITU, and Bellcore SONET/SDH

Regenerator Specifications

♦ 440mW Power Dissipation (at +3.3V)

♦ Clock Jitter Generation: 3.7mUI

RMS

♦ +3.3V or +5V Single Power Supply

♦ Fully Integrated Clock Recovery and Data Retiming

♦ Additional High-Speed Input Facilitates System

Loopback Diagnostic Testing

♦ Tolerates >2500 Consecutive Identical Digits

♦ Loss-of-Lock Indicator

♦ Differential CML Data and Clock Outputs

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

MAX3876

2.5Gbps, Low-Power, +3.3V

Clock Recovery and Data Retiming IC

________________________________________________________________ Maxim Integrated Products 1

Typical Application Circuit

19-1631; Rev 0; 1/00

PART

MAX3876EHJ -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

32 TQFP

Ordering Information

Pin Configuration appears at end of data sheet.

MAX3876E/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.

+3.3V

+3.3V

TTL

0.01µF

0.01µF

FILT

PHOTO­DIODE

IN

V

CC

MAX3866

PREAMPLIFIER

OUT+

OUT-

SYSTEM

LOOPBACK

CC

SDI+

SDI-

SLBI+

SLBI-

MAX3876

SIS FIL+ FIL-

TTL

1µF

LOLV

SDO+

SDO-

SCLKO+

SCLKO-

+3.3V

MAX3831

4:1/1:4

TRANSCEIVER

MAX3876

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-)..............±11mA

CML Output Current Levels

(SDO+, SDO-, SCLKO+, SCLKO-) ................................±22mA

Voltage at LOL, SIS, FIL+, FIL-...................-0.5V to (V

CC

+ 0.5V)

Continuous Power Dissipation (T

A

= +85°C)

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

Operating Temperature Range

MAX3876EHJ..................................................-40°C to +85°C

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

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

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

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

Figure 1, DC-coupled

Excluding CML output termination

CONDITIONS

VVCC- 0.4 VCC+ 0.4V

IS

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

mVp-p

50 1000

V

ID

mA135 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)

Ω48R

IN

Input Termination to V

CC

(SDI±, SLBI±)

mVp-p

CML Differential Output Voltage
Swing

ΩDifferential Output Impedance

V2.0V

IH

TTL Input High Voltage (SIS)

UNITSMIN TYP MAXSYMBOLPARAMETER

TTL Output Low Voltage (LOL)

V

OL

0.4 V

640 800 1000

85 100 115

RL= 50Ω to V

CC

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

VCC- 0.2RL= 50Ω to V

CC

V

CML Output Common-Mode
Voltage

580 800 1000

TA= 0°C to +85°C

TA= -40°C

DC-coupled VVCC- 0.25 V

CM

Input Common-Mode Voltage

Figure 1, AC-coupled 50 1600

+ 0.4V

V

CC

V

CC

800mV

25mV

t

CK

VCC - 0.4V

V

VCC - 0.25V

V

- 0.5V

CC

(a) AC-COUPLED SINGLE-ENDED INPUT (CML OR PECL)

CC

500mV

(b) DC-COUPLED SINGLE-ENDED CML INPUT

25mV

SCLKO+

SDO

t

CK-Q

MAX3876

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

75 ps

Figure 2

1.76 3.32

0.32 0.51

f = 100kHz

f = 10MHz

f = 70kHz (Note 3)

f = 1MHz

CONDITIONS

dB0.03 0.1J

P

Jitter Peaking

ps110 290

GHz2.488Serial Output Clock Rate

Clock-to-Q Delay

mUIp-p19.2 61.0

mUI

RMS

3.7 6.2

J

GEN

Jitter Generation

MHz1.4 2.0J

BW

Jitter Transfer Bandwidth

UIp-p

2.1 4.4

Jitter Tolerance

0.41 0.74

UNITSMIN TYP MAXSYMBOLPARAMETER

Data Output Edge Speed 20% to 80% 95 ps

Tolerated Consecutive
Identical Digits

2500

Bits

100kHz to 2.5GHz 17

2.5GHz to 4.0GHz 15

Jitter BW = 12kHz to 20MHz

Note 1: Dice are tested at TA= +25°C only.
Note 2: AC characteristics are guaranteed by design and characterization.
Note 3: At jitter frequencies < 70kHz, the jitter tolerance characteristics exceed the ITU/Bellcore specifications.

Input Return Loss
(SDI±, SLBI±)

dB

Typical Operating Characteristics

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

10ps/div

RECOVERED CLOCK JITTER

MAX3876 toc2

50mV/div

PRBS = 223-1
V

IN

= 50mVp-p
WIDEBAND JITTER
= 3.94ps

RMS

10

10k 1M

10M

100k

JITTER TOLERANCE

0.1

MAX3876 toc03

JITTER FREQUENCY (kHz)

INPUT JITTER (UIp-p)

1

PRBS = 223 - 1
50mVp-p INPUT

BELLCORE

MASK

100ps/div

RECOVERED DATA AND CLOCK

(DIFFERENTIAL OUTPUT)

MAX3876 toc1

DATA

CLOCK

223-1 PATTERN

V

IN

= 50mVp-p

TA = +25°C

200mV/div

MAX3876

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

4 _______________________________________________________________________________________

NAME FUNCTION

1, 2, 8, 9,

10, 16, 26,

29, 32

GND Supply Ground

3, 6, 11,
14, 15, 17,
20, 21, 24,

27, 28

V

CC

Positive Supply Voltage

PIN

4 SDI+ Positive Data Input. 2.488Gbps serial-data stream.

5 SDI- Negative Data Input. 2.488Gbps serial-data stream.

13 SLBI- Negative System Loopback Input. 2.488Gbps serial-data stream.

12 SLBI+ Positive System Loopback Input. 2.488Gbps serial-data stream.

7 SIS Signal Input Selection, TTL. Low for normal data input. High for system loopback input.

Pin Description

0

0.2

0.3

0.4

0.5

0.6

0.7

0.8

10 100 1000

JITTER TOLERANCE vs.

INPUT AMPLITUDE

MAX3876 toc04

INPUT SIGNAL AMPLITUDE (mVp-p)

JITTER TOLERANCE (UIp-p)

0.1

JITTER FREQUENCY = 1MHz

JITTER FREQUENCY = 5MHz

TA = +85°C
PRBS = 2

23

- 1

0.9

10

-10

10

-8

10

-9

10

-6

10

-7

10

-5

8.8 9.0 9.1 9.2 9.3 9.4 9.5 9.8

BIT ERROR RATE vs.

INPUT AMPLITUDE

MAX3876 toc06

INPUT SIGNAL AMPLITUDE (mVp-p)

BIT ERROR RATE

PRBS = 223 - 1

8.9 9.6 9.7

-3.0

-2.0

-2.5

-1.0

-1.5

0

-0.5

0.5

1k 10k 1M 10M

JITTER TRANSFER

MAX3876 toc05

JITTER FREQUENCY (Hz)

JITTER TRANSFER (dB)

100k

PRBS = 223 - 1

BELLCORE
MASK

Typical Operating Characteristics (continued)

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

18

SCLKO- Negative Serial Clock Output, CML, 2.488GHz. SDO- is clocked out on the falling edge of SCLKO-.

10

0.1
0 0.15 0.20 0.250.05 0.10

JITTER TOLERANCE

vs. PULSE-WIDTH DISTORTION

1.0

MAX3876 toc07

PULSE-WIDTH DISTORTION (UI)

JITTER TOLERANCE (UI)

PRBS = 223 - 1
100mVp-p INPUT

100kHz

1MHz

10MHz

SUPPLY CURRENT

160

155

150

145

140

135

SUPPLY CURRENT (mA)

130

125

120

-50 0-25 25 50 75 100

vs. TEMPERATURE

VCC = 5.0V

AMBIENT TEMPERATURE (°C)

MAX3876 toc08

VCC = 3.0V