- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358759 > LC72135M (Sanyo Electric Co.,Ltd.) PLL Frequency Synthesizer for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器) PDF資料下載
參數(shù)資料
| 型號： | LC72135M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | PLL Frequency Synthesizer for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器) |
| 中文描述： | 鎖相環(huán)頻率合成器電子調(diào)諧（用于電子調(diào)諧的鎖相環(huán)頻率合成器） |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 300K |
| 代理商： | LC72135M |
Clock Time Base Usage Notes
The pull-up resistor used on the clock time base output pin (BO1) should be at least 100 k
.
This is to prevent degrading the VCO C/N characteristics when a loop filter is formed using the built-in low-pass filter
transistor. Since the clock time base output pin and the low-pass filter have a common ground internal to the IC, it is
necessary to minimize the time base output pin current fluctuations and to suppress their influence on the low-pass filter.
Also, to prevent chattering we recommend using a Schmitt input at the controller (microprocessor) that receives this
signal.
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
Schemes in which a dead zone is present (OFF/OFF) have good loop stability, but have the problem that acquiring a
high C/N ratio can be difficult. On the other hand, although it is easy to acquire a high C/N ratio with schemes in
which there is no dead zone, it is difficult to achieve high loop stability. Therefore, it can be effective to select DZA
or DZB, which have no dead zone, in applications which require an FM S/R ratio in excess of 90 to 100 dB, or in
which an increased AM stereo pilot margin is desired. On the other hand, we recommend selecting DZC or DZD,
which provide a dead zone, for applications which do not require such a high FM signal-to-noise ratio and in which
either AM stereo is not used or an adequate AM stereo pilot margin can be achieved.
No. 5175-21/24
LC72135M
DZ1
DZ0
Dead zone mode
Charge pump
Dead zone
0
0
DZA
ON/ON
– –0 s
0
1
DZB
ON/ON
–0 s
1
0
DZC
OFF/OFF
+0 s
1
1
DZD
OFF/OFF
+ +0 s
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LC72136N | PLL Frequency Synthesizer for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器) |
| LC72136 | PLL Frequency Synthesizer for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器) |
| LC72137 | PLL Frequency Synthesizer for Electronic Tuning(用于電子調(diào)諧的鎖相環(huán)頻率合成器) |
| LC72140 | PLL Frequency Synthesizer(鎖相環(huán)頻率合成器) |
| LC72144M | PLL Frequency Synthesizer(鎖相環(huán)頻率合成器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC72135MA-AE | 功能描述:時鐘合成器/抖動清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| LC72135MA-Q-AE | 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / PLL FREQUENCY SYNTHESIZER |
| LC72135M-Q-TLM-E | 制造商:SANYO Semiconductor Co Ltd 功能描述: |
| LC72136 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning |
| LC72136M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。