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Si5341C-D-GM 数据表(PDF) 6 Page - Silicon Laboratories

部件名 Si5341C-D-GM
功能描述  Low-Jitter, 10 or 4-Output, Any-Frequency, Any-Output Clock Generator
Download  53 Pages
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

Si5341C-D-GM 数据表(HTML) 6 Page - Silicon Laboratories

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3.3.1 XA/XB Clock and Crystal Input
An internal crystal oscillator exists between pin XA and XB. When this oscillator is enabled, an external crystal connected across these
pins will oscillate and provide a clock input to the PLL. A crystal frequency of 25 MHz can be used although crystals in the frequency
range of 48 MHz to 54 MHz are recommended for best jitter performance. Frequency offsets due to CL mismatch can be adjusted using
the frequency adjustment feature which allows frequency adjustments of ± 1000 ppm. The Si5340/41 Family Reference Manual pro-
vides additional information on PCB layout recommendations for the crystal to ensure optimum jitter performance. Refer to Table
5.12 Crystal Specifications on page 31 for crystal specifications.
To achieve optimal jitter performance and minimize BOM cost, a crystal is recommended on the XA/XB reference input. A clock (e.g.,
XO) may be used in lieu of the crystal, but it will result in higher output jitter. See the Si5340/41 Reference Manual for more information.
Selection between the external XTAL or input clock is controlled by register configuration. The internal crystal load capacitors (CL) are
disabled in the input clock mode. Refer to Table 5.3 Input Clock Specifications on page 20 for the input clock requirements at XAXB.
Both a single-ended or a differential input clock can be connected to the XA/XB pins as shown in the figure below. A PXAXB divider is
available to accommodate external clock frequencies higher than 54 MHz.
Differential Connection
2xCL
2xCL
XB
XA
2xCL
2xCL
XB
XA
Single- ended XO Connection
Crystal Connection
OSC
XB
XA
XTAL
2xCL
2xCL
Si5341/40
Si5341/40
Si5341/40
Note:2. 0 Vpp_ se max
XO with Clipped Sine Wave
Output
2xCL
2xCL
XB
XA
OSC
Si5341/40
Note:2. 0 Vpp_ se max
CMOS Output
R2
R1
XO VDD
R1
R2
3. 3V 523 ohms442 ohms
2. 5V 475ohms 649 ohms
1. 8V 158ohms 866 ohms
0. 1 uf
0. 1uf
0. 1uf
0. 1uf
0. 1uf
0. 1 uf
0. 1 uf
Single-ended Connection
Note:2. 5 Vpp diff max
X1
X2
nc
nc
X1
X2
nc
nc
X1
X2
nc
nc
X2
X1
OSC
OSC
Figure 3.2. XAXB External Crystal and Clock Connections
Si5341/40 Rev D Data Sheet
Functional Description
silabs.com | Smart. Connected. Energy-friendly.
Rev. 1.0 | 5


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