MAX3873 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Low-Power, Compact 2.5Gbps/2.7Gbps Clock-Recovery and Data-Retiming IC

19-2087; Rev 2; 5/03
Low-Power, Compact 2.5Gbps/2.7Gbps
Clock-Recovery and Data-Retiming IC
General Description
The MAX3873 is a compact, low-power 2.488Gbps/
2.67Gbps clock-recovery and data-retiming IC for
SDH/SONET applications. The phase-locked loop (PLL)
recovers a synchronous clock signal from the serial
NRZ data input. The input data is then retimed by this
recovered clock, providing a clean data output. The
MAX3873 meets all SDH/SONET jitter specifications,
does not require an external reference clock to aid in
frequency acquisition, and provides excellent tolerance
to both deterministic and sinusoidal jitter. The MAX3873
provides a PLL loss-of-lock (LOL) output to indicate
whether the CDR is in lock. The recovered data and
clock outputs are CML with on-chip 50Ω back termina-
tions on each line. The clock output can be powered
down if not used.
The MAX3873 is implemented in Maxim’s second-gener-
ation SiGe process and consumes only 260mW at 3.3V
supply (output clock disabled, low output swing). The
device is available in a 4mm x 4mm 20-pin QFN
exposed-pad package and operates from -40°C to +85°C.
Applications
Switch Matrix Backplanes
SDH/SONET Receivers and Regenerators
Add/Drop Multiplexers
Digital Cross-Connects
SDH/SONET Test Equipment
DWDM Transmission Systems
Features
♦ Fully Integrated Clock Recovery and Data
Retiming
♦ Power Dissipation: 260mW with +3.3V Supply
♦ Clock Jitter Generation: 5mUI_RMS
♦ Exceeds ANSI, ITU, and Bellcore SDH/SONET
Jitter Specifications
♦ Differential Input Range: 50mV_P-P to 1.6V_P-P
♦ Single +3.3V Power Supply
♦ PLL Fast Track (FASTRACK) Mode Available
♦ Clock Output Can Be Disabled
♦ Input Data Rate: 2.488Gbps or 2.67Gbps
♦ Selectable Output Amplitude
♦ Tolerates 2000 Consecutive Identical Digits
♦ Loss-of-Lock Indicator
♦ Differential CML Data and Clock Outputs
♦ Operating Temperature Range: -40°C to +85°C
Ordering Information
PART
MAX3873EGP
TEMP
RANGE
-40°C to +85°C
PIN-
PACKAGE
20 QFN
(4mm x 4mm)
PKG.
CODE
G2044-3
Pin Configuration
TOP VIEW
Typical Application Circuit appears at end of data sheet.
RATESET 1
V_CC 2
SDI+ 3
SDI- 4
V_CC 5
MAX3873
15 SDO+
14 SDO-
13 VCC_BUF
12 SCLKO+
11 SCLKO-
QFN**
**NOTE: THE EXPOSED PAD MUST BE
SOLDERED TO THE SUPPLY GROUND.
________________________________________________________________ Maxim Integrated Products 1
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