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CS2000P-CZZR 参数 Datasheet PDF下载

CS2000P-CZZR图片预览
型号: CS2000P-CZZR
PDF下载: 下载PDF文件 查看货源
内容描述: 小数N分频时钟合成器与时钟乘法器 [Fractional-N Clock Synthesizer & Clock Multiplier]
分类和应用: 时钟
文件页数/大小: 30 页 / 568 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CS2000-OTP  
binary portion. In this configuration, the maximum multiplication factor is approximately 1,048,575 with a  
resolution of 244 PPM.  
The 20.12 format is enabled by the LFRatioCfg global parameter. The 20.12 ratio format is only available  
when the device is running in Hybrid PLL Mode. In Auto Fractional-N Source Selection Mode (see section  
5.4.6.2 on page 17) when CLK_IN is not present the LFRatioCfg parameter is ignored and the ratio format  
is 12.20.  
It is recommended that the 12.20 High-Resolution format be utilized whenever the desired ratio is less  
than 4096 since the output frequency accuracy of the PLL is directly proportional to the accuracy of the  
timing reference clock and the resolution of the R  
.
UD  
Referenced Control  
Parameter Definition  
LockClk[1:0] ..........................“Lock Clock Ratio (LockClk[1:0])” section on page 24  
LFRatioCfg............................“Low-Frequency Ratio Configuration (LFRatioCfg)” on page 26  
FracNSrc...............................“Fractional-N Source for Frequency Synthesizer (FracNSrc)” section on page 24  
5.4.3  
Manual Ratio Modifier (R-Mod)  
The manual Ratio Modifier is used to internally multiply/divide the currently addressed R  
(Ratio  
0-3  
UD  
stored in the register space remain unchanged). The available options for R-Mod are summarized in  
Table 2 on page 15. R-Mod is enabled via the M2 pin in conjunction with the appropriate setting of the  
M2Config[2:0] global parameter (see Section 5.7.2 on page 20).  
RModSel[1:0]  
R Modifier  
0.5  
00  
01  
10  
11  
0.25  
0.125  
0.0625  
Table 2. Ratio Modifier  
Referenced Control  
Parameter Definition  
Ratio 0-3................................“Ratio 0 - 3” on page 24  
RModSel[1:0] ........................“R-Mod Selection (RModSel[1:0])” section on page 23  
M2Config[2:0]........................“M2 Pin Configuration (M2Config[2:0])” on page 26  
5.4.4  
Automatic Ratio Modifier (Auto R-Mod) - Hybrid PLL Mode Only  
The Automatic R-Modifier uses the CLK_IN Frequency Range Detector to implement a frequency depen-  
dent multiply of the currently addressed R as shown in Table 3. The CLK_IN Frequency Range Detec-  
UD  
tor determines the ratio between the frequency of the internal SysClk and the CLK_IN input signal. The  
result of the ratio measurement is the internal status signal called FsDetect[1:0].  
Like with R-Mod, the Ratio  
parameters stored in the one time programmable memory remain un-  
0-3  
changed. The Automatic Ratio Modifier is enabled either by the AutoRMod modal parameter or via the  
M2 pin in conjunction with the appropriate setting of the M2Config[2:0] global parameter (see Section  
5.7.2 on page 20).  
f
/ f  
FsDetect[1:0]  
Auto R Modifier  
SysClk CLK_IN  
00  
01  
10  
> 224  
96 - 224  
< 96  
1
0.5  
0.25  
Table 3. Automatic Ratio Modifier  
DS758PP1  
15  
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