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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  
Frequency References  
Section 3: Frequency References  
An external crystal is used for generating all radio frequencies and normal operation clocking. As an alternative,  
an external frequency reference may be used. In addition, a low-power oscillator (LPO) is provided for lower  
power mode timing.  
Crystal Interface and Clock Generation  
The BCM88335 can use an external crystal to provide a frequency reference. The recommended configuration  
for the crystal oscillator, including all external components, is shown in Figure 4. Consult the reference  
schematics for the latest configuration and recommended components.  
Figure 4: Recommended Oscillator Configuration  
C *  
WRF_XTAL_IN  
37.4 MHz  
C *  
X ohms *  
WRF_XTAL_OUT  
* Values determined by crystal drive  
level. See reference schematics for details.  
A fractional-N synthesizer in the BCM88335 generates the radio frequencies, clocks, and data/packet timing,  
enabling the BCM88335 to operate using a wide selection of frequency references.  
For SDIO applications, the recommended default frequency reference is a 37.4 MHz crystal. The signal  
characteristics for the crystal interface are listed in Table 2 on page 27.  
Note: Although the fractional-N synthesizer can support alternative reference frequencies,  
frequencies other than the default require support to be added in the driver, plus additional extensive  
system testing. Contact Broadcom for details.  
Broadcom®  
September 23, 2015 • 88335-DS100-R  
Page 26  
BROADCOM CONFIDENTIAL  
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