參數(shù)資料
型號(hào)： LC72134M
元件分類： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 160 MHz, PDSO24
封裝： MFP-24
文件頁(yè)數(shù)： 16/27頁(yè)
文件大小： 463K
代理商： LC72134M
No. 5814-23/27
LC72134M
Other Items
Notes on the phase comparator dead zone
When the charge pump is used with one of the ON/ON modes, correction pulses are generated from the charge pump
even if the PLL is locked. As a result, it is easy for the loop to become unstable, and special care is required in
application design. The following problems can occur if an ON/ON mode is used.
— Sidebands may be created by reference frequency leakage.
— Sidebands may be created by low-frequency leakage due to the correction pulse envelope.
Although the loop is more stable when a dead zone is present (i.e. when an OFF/OFF mode is used), a dead band
makes it more difficult to achieve excellent C/N characteristics. On the other hand, while it is easy to achieve good C/N
characteristics when there is no dead zone, achieving good loop stability is difficult. Accordingly, the DZA and DZB
settings, in which there is no dead zone, can be effective in situations where a signal-to-noise ratio of 90 to 100 dB or
higher is required in FM reception, or where it is desirable to increase the pilot margin in AM stereo reception.
However, if such a high signal-to-noise ratio is not required for FM reception, if an adequate pilot margin can be
acquired in AM stereo reception, or if AM stereo is not required, then either DZC or DZD, in which there is a dead
band, should be chosen.
DZ1
DZ0
Dead band mode
Charge pump
Dead band
0
DZA
ON/ON
– –0s
0
1
DZB
ON/ON
–0s
1
0
DZC
OFF/OFF
+0s
1
DZD
OFF/OFF
+ +0s
≥
相關(guān)PDF資料
PDF描述
LC72135M PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO20
LC72136NM PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO24
LC72140M PLL FREQUENCY SYNTHESIZER, 160 MHz, PDSO24
LC72140 PLL FREQUENCY SYNTHESIZER, 160 MHz, PDIP24
LC72146 PLL FREQUENCY SYNTHESIZER, 40 MHz, PDIP24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LC72135M 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL Frequency Synthesizer for Electronic Tuning
LC72135MA-AE 功能描述:時(shí)鐘合成器/抖動(dòng)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
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