參數(shù)資料
型號： SI5338D-A-GM
廠商： Silicon Laboratories Inc
文件頁數(shù)： 20/44頁
文件大小： 0K
描述： IC CLK GEN I2C BUS PROG 24QFN
標準包裝： 490
系列： MultiSynth™
類型： *
PLL： 是
輸入： CML，HCSL，HSCL，LVDS，LVPECL，晶體
輸出： CMOS，HCSL. HSTL. LVDS. LVPECL. SSTL
電路數(shù)： 1
比率 - 輸入:輸出： 1:4
差分 - 輸入:輸出： 是/是
頻率 - 最大： 700MHz
除法器/乘法器： 是/是
電源電壓： 1.71 V ~ 3.63 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤
供應商設備封裝： 24-QFN（4x4）
包裝： 托盤
Si5338
Rev. 1.3
27
3.10.4. Output Synchronization
Upon power up or a soft_reset the Si5338 synchronizes
the output clocks. With normal output polarity (no output
clock inversion), the Si5338 synchronizes the output
clocks to the falling, not rising edge. Synchronization at
the rising edge can be done by inverting all the clocks
that are to be synchronized.
3.10.5. Output R Divider
When the requested output frequency of a channel is
below 5 MHz, the Rn (n = 0,1,2,3) divider needs to be
set and enabled. This is automatically done in register
maps generated by the ClockBuilder Desktop. When
the Rn divider is active the step size range of the
frequency
increment
and decrement
function
will
decrease by the Rn divide ratio. The Rn divider can be
set to {1, 2, 4, 8, 16, 32}.
Non-unity settings of R0 will affect the Finc/Fdec step
size at the MultiSynth0 output. For example, if the
MultiSynth0 output step size is 2.56 MHz and R0 = 8,
the step size at the output of R0 will be 2.56 MHz
divided by 8 = .32 MHz. When the Rn divider is set to
non-unity, the initial phase offset of the CLKn output with
respect to other CLKn outputs is not guaranteed.
3.10.6. Zero-Delay Mode
The Si5338 supports an optional zero delay mode of
operation for applications that require minimal input-to-
output delay. In this mode, one of the device output
clocks is fed back to the feedback input pin (IN4 or IN5/
IN6) to implement an external feedback path which
nullifies the delay between the reference input and the
output clocks. Figure 15 shows the Si5338 in a typical
zero-delay configuration. It is generally recommended
that Clk3 be LVDS and that the feedback input be pins 5
and 6. For the differential input configuration to pins 5
and 6, see Figure 3 on page 18. The zero-delay mode
combined with the phase increment/decrement feature
allows unprecedented flexibility in generating clocks
with precise edge alignment.
Figure 15. Si5338 in Zero Delay Clock
Generator Mode
3.10.7. Spread Spectrum
To help reduce electromagnetic interference (EMI), the
Si5338 supports spread spectrum modulation. The
output clock frequencies can be modulated to spread
energy across a broader range of frequencies, lowering
system EMI. The Si5338 implements spread spectrum
using its patented MultiSynth technology to achieve
previously unattainable precision in both modulation
rate and spreading magnitude as shown in Figure 16.
Through I2C control, the Spread spectrum can be
applied to any output clock, any clock frequency, and
any spread amount from ±0.1% to ±2.5% center spread
and –0.1% to –5% down spread.
The spreading rate is limited to 30 to 63 kHz.
The Spread Spectrum is generated digitally in the output
MultiSynths which means that the Spread Spectrum
parameters
are
virtually
independent
of
process,
voltage and temperature variations. Since the Spread
Spectrum is created in the output MultiSynths, through
I2C each output channel can have independent Spread
Spectrum parameters. Without the use of I2C (NVM
download only) the only supported Spread Spectrum
parameters are for PCI Express compliance composing
100 MHz clock, 31.5 kHz spreading frequency with the
choice of the spreading.
Rev A devices provide native support for both down and
center spread. Center spread is supported in rev B
devices by up-shifting the nominal frequency and using
down-spread register parameters. Consult the Si5338
Reference Manual for details.
Note: If you currently use center spread on a revision A and
would like to migrate to a revision B device, you must
generate a new register map using either ClockBuilder
Desktop or the equations in the Si5338 Reference
Manual. Center spread configurations for Revisions A
and B are not compatible.
Clk0
MS2
MS3
R2
R3
P2
Si5338
PLL
R0
R1
MS1
MS0
P1
Clk
Input
Clk1
Clk2
Clk3
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相關代理商/技術參數(shù)
參數(shù)描述
SI5338D-A-GMR 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C-Program Clk Gen 0.16-710MHz Pin-Ctrl 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
Si5338D-B-GM 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C-PRGRMBL clock generatr 0.16-700MHz 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
Si5338D-B-GMR 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C-Program Clk Gen 0.16-710MHz Pin-Ctrl 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
Si5338E-A-GM 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C-PRGRMBL clock generatr 0.16-350MHz 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
SI5338E-A-GMR 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C-Program Clk Gen 0.16-350MHz Pin-Ctrl 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56
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