參數(shù)資料
型號: ICS83940DYI-01LF
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 18/18頁
文件大?。?/td> 0K
描述: IC CLOCK BUFFER MUX 2:18 32-LQFP
標準包裝: 250
系列: HiPerClockS™
類型: 扇出緩沖器(分配),多路復用器
電路數(shù): 1
比率 - 輸入:輸出: 2:18
差分 - 輸入:輸出: 是/無
輸入: CML,LVCMOS,LVPECL,LVTTL,SSTL
輸出: LVCMOS,LVTTL
頻率 - 最大: 250MHz
電源電壓: 2.375 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-LQFP
供應商設備封裝: 32-TQFP(7x7)
包裝: 托盤
其它名稱: 83940DYI-01LF
ICS83940DYI-01 REVISION A SEPTEMBER 27, 2010
9
2010 Integrated Device Technology, Inc.
ICS83940I-01 Data Sheet
LOW SKEW, 1-TO-18 LVPECL-TO-LVCMOS/LVTTL FANOUT BUFFER
Additive Phase Jitter
The spectral purity in a band at a specific offset from the fundamental
compared to the power of the fundamental is called the dBc Phase
Noise. This value is normally expressed using a Phase noise plot
and is most often the specified plot in many applications. Phase noise
is defined as the ratio of the noise power present in a 1Hz band at a
specified offset from the fundamental frequency to the power value of
the fundamental. This ratio is expressed in decibels (dBm) or a ratio
of the power in the 1Hz band to the power in the fundamental. When
the required offset is specified, the phase noise is called a dBc value,
which simply means dBm at a specified offset from the fundamental.
By investigating jitter in the frequency domain, we get a better
understanding of its effects on the desired application over the entire
time record of the signal. It is mathematically possible to calculate an
expected bit error rate given a phase noise plot.
As with most timing specifications, phase noise measurements has
issues relating to the limitations of the equipment. Often the noise
floor of the equipment is higher than the noise floor of the device. This
is illustrated above. The device meets the noise floor of what is
shown, but can actually be lower. The phase noise is dependent on
the input source and measurement equipment.
The source generator, “SMA 100A 9kHz – 6GHz Low Noise Signal
Generator as external input to an Agilent 8133A 3GHz Pulse
Generator".
3.3V/3.3V, LVCMOS_CLK
Additive Phase Jitter @ 155.52MHz
12kHz to 20MHz = 0.108ps (typical)
SSB
Phas
e
N
o
ise
dBc/Hz
Offset from Carrier Frequency (Hz)
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