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參數(shù)資料
| 型號： | SI5017-D-GM |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 6/26頁 |
| 文件大小： | 0K |
| 描述： | IC CLOCK/DATA RECOVERY 28MLP |
| 標準包裝： | 60 |
| 系列： | DSPLL® |
| 類型： | 時鐘和數(shù)據(jù)恢復(fù)（CDR） |
| PLL： | 是 |
| 主要目的： | SONET/SDH，ATM 應(yīng)用 |
| 輸入： | 時鐘 |
| 輸出： | CML |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:2 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 2.7GHz |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-MLP-EP（5x5） |
| 包裝： | 管件 |
| 其它名稱： | 336-1279 |
Si5017
14
Rev. 1.5
In many applications it is desirable to produce a fixed
amount of signal hysteresis for an alarm indicator such
as LOS, since a marginal data input signal could cause
intermittent toggling, leading to false alarm status.
When it is anticipated that very low-level DIN signals will
be encountered, the introduction of an adequate
amount of LOS hysteresis is recommended to minimize
any undesirable LOS signal toggling. Figure 7 illustrates
a simple circuit that may be used to set a fixed level of
LOS signal hysteresis for the Si5017 CDR. The value of
R1 may be chosen to provide a range of hysteresis from
3 to 8 dB where a nominal value of 800
adjusts the
hysteresis level to approximately 6 dB. Use a value of
500
or 1000 for R1 to provide 3 dB or 8 dB of
hysteresis, respectively.
Hysteresis is defined as the ratio of the LOS deassert
level (LOSD) and the LOS assert level (LOSA). The
hysteresis in decibels is calculated as 20log(LOSD/
LOSA).
4.8. Bit-Error-Rate (BER) Detection
The Si5017 uses a proprietary Silicon Laboratories
algorithm to generate a bit-error-rate (BER) alarm on
the BER_ALM pin if the observed BER is greater than a
user programmable threshold. Bit error detection relies
on the input data edge timing; edges occurring outside
of the expected event window are counted as bit errors.
The BER threshold is programmed by applying a
voltage to the BER_LVL pin between 500 mV and
2.25 V corresponding to a BER of approximately 10–10
and 10–6, respectively. The voltage present on
BER_LVL maps to the BER as follows: log10(BER) = (4
x BER_LVL) – 13. (BER_LVL is in volts; BER is in bits
per second.).
4.9. Data Slicing Level
The Si5017 provides the ability to externally adjust the
slicing level for applications that require bit-error-rate
(BER) optimization. Adjustments in slicing level of
±25 mV (typical, relative to the internally set input
common mode voltage) are supported. The slicing level
is set by applying a voltage between 0.75 and 2.25 V to
the SLICE_LVL input. See Figure 8 for the operation
levels of the slice circuit.
When SLICE_LVL is driven below 500 mV, the slicing
level adjustment is disabled, and the slicing level is set
to the cross-point of the differential input signal.
Note: The slice circuit is designed to only work with pseudo-
random, dc-balanced data.
Figure 8. Si5017 OC-48 Slice Specification
-40
-30
-20
-10
0
10
20
30
40
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
N
o
tS
pec
ified
S
lic
e
D
is
able
10 mV
Note: SLICE is a continuous curve. This chart shows
the range of results from part-to-part.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI5017-D-GMR | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 OC48/STM16 CDR FEC RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SI5017-EVB | 功能描述:時鐘和定時器開發(fā)工具 OC48 STM16 SNT/SDH 2.7Gbps w/ limit amp RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| SI5017-X-GM | 制造商:SILABS 制造商全稱:SILABS 功能描述:OC-48/STM-16 SONET/SDH CDR IC WITH LIMITING AMPLIFIER |
| SI5018 | 制造商:SILABS 制造商全稱:SILABS 功能描述:SiPHY⑩ OC-48/STM-16 CLOCK AND DATA RECOVERY IC WITH FEC |
| SI-50182 | 制造商:BEL 制造商全稱:Bel Fuse Inc. 功能描述:SI-50182 |
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