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BCM88335L2CUBG 参数 Datasheet PDF下载

BCM88335L2CUBG图片预览
型号: BCM88335L2CUBG
PDF下载: 下载PDF文件 查看货源
内容描述: [Telecom Circuit, 1-Func, PBGA145, WLBGA-145]
分类和应用: 电信电信集成电路
文件页数/大小: 140 页 / 2728 K
品牌: CYPRESS [ CYPRESS ]
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BCM88335 Data Sheet  
External Frequency Reference  
External Frequency Reference  
As an alternative to a crystal, an external precision frequency reference can be used. The recommended default  
frequency is 37.4 MHz. This must meet the phase noise requirements listed in Table 2.  
If used, the external clock should be connected to the WRF_XTAL_IN pin through an external 1000 pF coupling  
capacitor, as shown in Figure 5. The internal clock buffer connected to this pin will be turned off when the  
BCM88335 goes into sleep mode. When the clock buffer turns on and off, there will be a small impedance  
variation. Power must be supplied to the WRF_XTAL_BUCK_VDD1P5 pin.  
Figure 5: Recommended Circuit to Use with an External Reference Clock  
1000 pF  
Reference  
WRF_XTAL_IN  
Clock  
NC  
WRF_XTAL_OUT  
Table 2: Crystal Oscillator and External Clock—Requirements and Performance  
External Frequency  
Crystala  
Referenceb c  
Parameter  
Conditions/Notes  
Min. Typ. Max. Min. Typ. Max. Units  
Frequency  
2.4 GHz and 5 GHz bands,  
IEEE 802.11ac operation  
35  
37.4 38.4  
37.4  
MHz  
Frequency  
Frequency  
5 GHz band, IEEE 802.11n  
operation only  
19  
37.4 38.4 35  
37.4 38.4 MHz  
d
2.4 GHz band IEEE 802.11n  
operation, and both bands  
legacy 802.11a/b/g operation  
only  
Ranges between 19 MHz and 38.4 MHz  
Frequency tolerance Without trimming  
over the lifetime of the  
–20  
20  
–20  
20  
ppm  
pF  
equipment, including  
e
temperature  
Crystal load  
capacitance  
12  
ESR  
60  
Drive level  
External crystal must be able to 200  
tolerate this drive level.  
µW  
Input impedance  
(WRF_XTAL_IN)  
Resistive  
30k  
100k  
Capacitive  
7.5  
7.5  
0.2  
pF  
V
WRF_XTAL_IN  
input low level  
DC-coupled digital signal  
0
Broadcom®  
September 23, 2015 • 88335-DS100-R  
Page 27  
BROADCOM CONFIDENTIAL