欢迎访问ic37.com |
会员登录 免费注册
发布采购

MB15E03SL 参数 Datasheet PDF下载

MB15E03SL图片预览
型号: MB15E03SL
PDF下载: 下载PDF文件 查看货源
内容描述: 单串行输入锁相环频率合成片1.2 GHz的预分频器 [Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler]
分类和应用: 预分频器
文件页数/大小: 26 页 / 219 K
品牌: FUJITSU [ FUJITSU ]
 浏览型号MB15E03SL的Datasheet PDF文件第8页浏览型号MB15E03SL的Datasheet PDF文件第9页浏览型号MB15E03SL的Datasheet PDF文件第10页浏览型号MB15E03SL的Datasheet PDF文件第11页浏览型号MB15E03SL的Datasheet PDF文件第13页浏览型号MB15E03SL的Datasheet PDF文件第14页浏览型号MB15E03SL的Datasheet PDF文件第15页浏览型号MB15E03SL的Datasheet PDF文件第16页  
MB15E03SL  
4. Power Saving Mode (Intermittent Mode Control Circuit)  
Table 10. PS Pin Setting  
PS pin  
Status  
H
L
Normal mode  
Power saving mode  
The intermittent mode control circuit reduces the PLL power consumption.  
By setting the PS pin low, the device enters into the power saving mode, reducing the current consumption. See  
the Electrical Characteristics chart for the specific value.  
The phase detector output, Do, becomes high impedance.  
For the signal PLL, the lock detector, LD, remains high, indicating a locked condition.  
Setting the PS pin high, releases the power saving mode, and the device works normally.  
The intermittent mode control circuit also ensures a smooth startup when the device returns to normal operation.  
When the PLL is returned to normal operation, the phase comparator output signal is unpredictable. This is because  
of the unknown relationship between the comparison frequency (fp) and the reference frequency (fr) which can  
cause a major change in the comparator output, resulting in a VCO frequency jump and an increase in lockup time.  
To prevent a major VCO frequency jump, the intermittent mode control circuit limits the magnitude of the error  
signal from the phase detector when it returns to normal operation.  
Notes: When power (VCC) is first applied, the device must be in standby mode, PS = Low, for at least 1 µs.  
PS pin must be set “L” for Power-ON.  
OFF  
ON  
VCC  
tV 1 µs  
Clock  
Data  
LE  
tPS 100 ns  
PS  
(1)  
(2)  
(3)  
(1) PS = L (power saving mode) at Power ON  
(2) Set serial data 1 µs later after power supply remains stable (VCC > 2.2 V).  
(3) Release power saving mode (PS: “L” “H”) 100 ns later after setting serial data.  
12