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DS1085Z-10 参数 Datasheet PDF下载

DS1085Z-10图片预览
型号: DS1085Z-10
PDF下载: 下载PDF文件 查看货源
内容描述: EconOscillator频率合成器 [EconOscillator Frequency Synthesizer]
分类和应用: 信号电路锁相环或频率合成电路光电二极管
文件页数/大小: 21 页 / 332 K
品牌: DALLAS [ DALLAS SEMICONDUCTOR ]
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DS1085  
External control inputs, CTRL1 and CTRL0, enable or disable the two oscillator outputs. Both outputs  
feature a synchronous enable that ensures no output glitches when the output is enabled and a constant  
time interval (for a given frequency setting) from an enable signal to the first output transition. These  
inputs also can be configured to disable the master oscillator, putting the device into a low-power mode  
for power-sensitive applications.  
Figure 1. DS1085 BLOCK DIAGRAM  
0M0  
1M0  
0M1  
1M1  
OVERVIEW  
A block diagram of the DS1085 is shown in Figure 1. The DS1085 consists of five major components:  
C Master oscillator control DAC  
C Internal master oscillator (66MHz to 133MHz)  
C Prescalers (divide-by-1, 2, 4, or 8)  
C Programmable divider (divide-by-1 to 1025)  
C Control registers  
The internal master oscillator provides the reference clock (MCLK), which is fed to the prescalers and  
programmable dividers. The frequency of the oscillator can be user-programmed over a two-to-one range  
in increments equal to the step size, by means of a 10-bit control DAC. The master oscillator range is  
66MHz to 133MHz, which is larger than the range possible with the 10-bit DAC resolution and available  
step sizes. Therefore, an additional register (OFFSET) is provided that can be used to select the range of  
frequency over which the DAC is used (see Table 1).  
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