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参数资料
| 型号： | LC72137 |
| 元件分类： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDIP22 |
| 封装： | SDIP-22 |
| 文件页数： | 11/22页 |
| 文件大小： | 348K |
| 代理商： | LC72137 |
No. 5743-19/22
LC72137, 72137M
When directly outputting data from the DO pin (set up by the DO pin control data)
Since the DO pin outputs the unlocked state (locked: high, unlocked: low) the timing considerations in the technique
described in the previous section are not necessary. After changing the value of N, the locked state can be determined
after waiting at least two periods of the reference frequency.
Notes on Clock Time Base Usage
When the clock time base output is used, the value of the pull-up resistor for the output pin (BO1) must be at least 100 k
.
We recommend the use of a Schmitt input on the receiving controller (microprocessor) to prevent chattering.This is to
avoid degradation of the VCO C/N characteristics when using the built-in low-pass filter transistor to form the loop
filter. Since the clock time base output pin and the low-pass filter transistor ground are the same mode in the IC, the time
base output pin current fluctuations must be suppressed to limit the influence on the low-pass filter.
Other Items
1. Notes on the Phase Comparator Dead Zone
Since correction pulses are output from the charge pump even if the PLL is locked when the charge pump is in the
ON/ON state, the loop can easily become unstable. This point requires special care when designing application
circuits.
The following problems may occur in the ON/ON state.
Side band generation due to reference frequency leakage
Side band generation due to both the correction pulse envelope and low frequency leakage
DZ1
DZ0
Dead-zone mode
Charge pump
Dead zone
0
DZA
ON/ON
– –0 s
0
1
DZB
ON/ON
–0 s
1
0
DZC
OFF/OFF
+0 s
1
DZD
OFF/OFF
+ +0 s
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LC72137_11 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer |
| LC72137M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning |
| LC72137MA-AE | 功能描述:时钟合成器/抖动清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| LC72140 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizers |
| LC72140M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizers |
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