Si5023
MULTI-RATE SONET/SDH CDR IC WITH LIMITING AMPLIFIER
Features
High-speed clock and data recovery device with integrated limiting amp:
ꢀ Supports OC-48/12/3, STM-16/4/ ꢀ Bit error rate alarm
1, Gigabit Ethernet, and 2.7 Gbps
FEC
ꢀ Reference and referenceless
operation supported
®
ꢀ Loss-of-signal level alarm
ꢀ Data slicing level control
ꢀ DSPLL technology
ꢀ Jitter generation 3.0 mUI
rms
ꢀ 10 mV differential sensitivity
(TYP)
PP
Ordering Information:
ꢀ Small footprint: 5 x 5 mm
ꢀ 3.3 V supply
See page 25.
Applications
ꢀ SONET/SDH/ATM routers
ꢀ Add/drop multiplexers
ꢀ Digital cross connects
ꢀ Gigabit Ethernet interfaces
ꢀ SONET/SDH test equipment
ꢀ Optical transceiver modules
ꢀ SONET/SDH regenerators
ꢀ Board level serial links
Pin Assignments
Si5023
28 27 26 25 24 23 22
Description
RATESEL0
RATESEL1
LOS_LVL
SLICE_LVL
REFCLK+
REFCLK–
LOL
VDD
1
2
3
4
5
6
7
21
20
19
18
17
16
15
REXT
The Si5023 is a fully-integrated, high-performance limiting amp and clock
and data recovery (CDR) IC for high-speed serial communication systems.
It derives timing information and data from a serial input at OC-48/12/3,
STM-16/4/1, or Gigabit Ethernet (GbE) rates. Support for 2.7 Gbps data
streams is also provided for OC-48/STM-16 applications that employ
forward error correction (FEC). Use of an external reference clock is
RESET/CAL
VDD
GND
Pad
DOUT+
DOUT–
GND
8
9
10 11 12 13 14
®
optional. Silicon Laboratories DSPLL technology eliminates sensitive
noise entry points, thus making the PLL less susceptible to board-level
interaction and helping to ensure optimal jitter performance.
Top View
The Si5023 represents a new standard in low jitter, low power, small size,
and integration for high-speed LA/CDRs. It operates from a 3.3 V supply
over the industrial temperature range (–40 to 85 °C).
Functional Block Diagram
LOS_LVL
Signal
Detect
DSQLCH
LOS
2
DOUT+
DOUT–
Retimer
BUF
BUF
2
DIN+
DIN–
Limiting
Amp
DSPLL
BER
Monitor
2
CLKOUT+
CLKOUT–
CLK_DSBL
REFCLK+
REFCLK–
(Optional)
2
Lock
Detection
2
Reset/
Calibration
Bias Gen.
REXT
BER_ALM
RESET/CAL
BERMON
BER_LVL
RATESEL
SLICE_LVL
LOL
LTR
Rev. 1.25 10/05
Copyright © 2005 by Silicon Laboratories
Si5023