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參數資料
| 型號： | S3014 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | SONET/SDH Clock Recovery and Synthesis Unit(SONET/SDH時鐘恢復和合成器件) |
| 中文描述： | SONET / SDH的時鐘恢復和合成單元（SONET / SDH的時鐘恢復和合成器件） |
| 文件頁數： | 1/10頁 |
| 文件大小： | 99K |
| 代理商： | S3014 |
1
S3014
S3014
BiCMOS PECL CLOCK GENERATOR
DEVICE SPECIFICATION
FEATURES
Complies with ANSI, Bellcore, and CCITT
specifications for jitter tolerance
On-chip high frequency PLL with internal loop
filter for clock generation or clock recovery
Supports clock generation for STS-3/STM-1
(155.52 MHz)
Supports clock recovery for STS-3/STM-1
(155.52 Mbit/s) or STS-12/STM-4
(622.08 Mbit/s) NRZ data
Selectable 19.44 MHz, 51.84 MHz, or
155.52 MHz reference frequency
Lock detect—monitors transition density
and run length
Low power
Low-jitter ECL interface
Small 44 PLCC or CLCC package
TTL reference clock output
GENERAL DESCRIPTION
The function of the S3014 clock synthesis and recov-
ery unit is to derive high speed timing signals for
SONET/SDH-based equipment. The S3014 is imple-
mented using AMCC’s proven Phase Locked Loop
(PLL) technology.
In Clock Recovery mode, the S3014 receives either
an STS-3/STM-1 or STS-12/STM-4 scrambled NRZ
signal and recovers the clock from the data. The chip
outputs a differential ECL bit clock and retimed data.
In Clock Synthesis mode, the S3014 receives a
19.44, 51.84, or 155.52 MHz reference clock and out-
puts an STS-3/STM-1 or STS-12/STM-4 differential
ECL clock.
The S3014 utilizes an on-chip PLL which consists of
a phase detector, a loop filter, and a voltage con-
trolled oscillator (VCO). The phase detector
compares the phase relationship between the VCO
output and the REFCLK input, a loop filter converts
the phase detector output into a smooth DC voltage,
and the DC voltage is input to the VCO whose fre-
quency is varied by this voltage. A block diagram is
shown in Figure 1.
Figure 1. System Block Diagram
2
3
2
2
2
REFCKOUT
SERCLKOP/N
LOCKDET
SERDATOP/N
REFCKINP/N
TSTCLKEN
SEL(2:0)
RST
SERDATIP/N
LOOP
FILTER
VCO
CLOCK
DIVIDER
PHASE DETECTOR
LOCK
DETECTOR
CAP1
CAP2
LOS
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