參數(shù)資料
型號： SI5356A-AXXXXX-GMR
廠商： SILICON LABORATORIES
元件分類： 時鐘產(chǎn)生/分配
英文描述： 200 MHz, PROC SPECIFIC CLOCK GENERATOR, QCC24
封裝： 4 X 4 MM, ROHS COMPLIANT, MO-220VGGD-8, QFN-24
文件頁數(shù)： 3/26頁
文件大?。?/td> 345K
代理商： SI5356A-AXXXXX-GMR
Si5356
Preliminary Rev. 0.3
11
3.4. Frequency Configuration
The Si5356 utilizes a single PLL-based architecture,
four independent MultiSynth fractional output dividers,
and a MultiSynth fractional feedback divider such that a
single device provides the clock generation capability of
four independent PLLs. Unlike competitive multi-PLL
solutions, the Si5356 can generate four unique non-
integer related output frequencies with 0 ppm frequency
error, with respect to the reference, for any combination
of output frequencies. In addition, any combination of
output frequencies can be generated from a single
reference frequency without having to change the
crystal
or
reference
clock
frequency
between
configurations.
Frequency configurations are fully programmable by
writing to device registers using the I2C interface. Any
combination of output frequencies ranging from 1 to
200 MHz can be configured on each of the device
outputs.
The following equation governs how the output
frequency is calculated.
where fIN is the reference frequency, N is the MultiSynth
feedback divider value, P is the reference divider value,
Mi is the MultiSynth output divider value and fOUT is the
resulting output frequency. The MultiSynth output and
feedback dividers are fractional dividers expressed in
terms of an integer and a fraction. The integer portion
has 10-bit resolution and the fractional portion has 30-
bit resolution in both the numerator and denominator,
meaning that any output frequency can be defined
exactly from the input frequency with exact (0 ppm)
frequency synthesis error.
3.5. Configuring the Si5356
The Si5356 is a highly-flexible clock generator that is
entirely configurable through its I2C interface. The
device’s default configuration is stored in non-volatile
memory (NVM) as shown in Figure 4. The NVM is a
one-time programmable memory (OTP), which can
store a custom user configuration at power-up. This is a
useful feature for applications that need a clock present
at power-up (e.g., for providing a clock to a processor).
Figure 4. Si5356 Memory Configuration
During a power cycle or a power-on reset (POR), the
contents of the NVM are copied into random access
memory (RAM), which sets the device configuration that
will be used during operation. Any changes to the
device configuration after power-up are made by
reading and writing to registers in the RAM space
through the I2C interface. ClockBuilder Desktop (see
can be used to easily configure register map files that
can be written into RAM (see “3.5.2. Creating a New
Configuration for RAM” for details). Alternatively, the
register map file can be created manually with the help
of the equations in AN565.
Two versions of the Si5356 are available. First, non-
customized Si5356 devices are available in which the
RAM can be configured in-circuit via I2C. These blank
Si5356 devices can also be field programmed using the
Si5338/56-PROG-EVB (see “3.5.5. Writing a Custom
Configuration to NVM”). Second, custom factory-
programmed Si5356 devices are available that include
a
user-specified
startup
frequency
configuration
(example part number Si5356A-Axxxxx-GM).
3.5.1. Ordering a Custom NVM Configuration
The Si5356 is orderable with a factory-programmed
custom NVM configuration. This is the simplest way of
using the Si5356 since it generates the desired output
frequencies at power-up or after a power-on reset
(POR). This default configuration can be reconfigured in
RAM through the I2C interface after power-up (see
The first step in ordering a custom device is generating
an NVM file which defines the input and output clock
frequencies and signal formats. This is easily done
using the NVM
Save for Factory Programming... menu
option
in
ClockBuilder
Desktop.
(See
Windows based software allows the user to generate an
NVM file, which is used by the factory to manufacture
custom parts. Each custom part is marked with a unique
part number identifying the specific configuration (e.g.,
Si5356A-A00100-GM).
Consult your local sales representative for more details
on ordering a custom Si5356.
3.5.2. Creating a New Configuration for RAM
Any Si5356 device can be configured by writing to
registers in RAM through the I2C interface. A non-
factory programmed device must be configured in this
manner.
fOUT
fIN N
PMi
-----------------
=
Power-Up/POR
I
2C
RAM
NVM
(OTP)
Default
Config
相關(guān)PDF資料
PDF描述
SI5369B-C-GQR 808 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369B-C-GQ 808 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369C-C-GQ 346 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369D-C-GQ 243 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369D-C-GQR 243 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
Si5356A-B-GM 功能描述:時鐘緩沖器 I2C-prog 8-out CMOS Clk gen 1-200MHz RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:5 最大輸入頻率:40 MHz 傳播延遲（最大值）: 電源電壓-最大:3.45 V 電源電壓-最小:2.375 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LLP-24 封裝:Reel
Si5356A-B-GMR 功能描述:時鐘發(fā)生器及支持產(chǎn)品 I2C CMOS Clk Gen 1-200MHz Blank NVM 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
SI5356A-BXXXXX-GM 制造商:Silicon Laboratories Inc 功能描述:IC CLK GENERATOR I2C 24QFN
Si5356-EVB 功能描述:時鐘和定時器開發(fā)工具 Si5356 Eval Board 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
Si535x-20QFN-EVB 功能描述:時鐘和定時器開發(fā)工具 Si5350/51 Eval Board 20-QFN 8-output 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
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