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參數(shù)資料
| 型號： | LC72151V |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO30 |
| 封裝： | SSOP-30 |
| 文件頁數(shù)： | 16/29頁 |
| 文件大小： | 326K |
| 代理商： | LC72151V |
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The LC72151V’s general-purpose counter is a 20-bit binary counter.
The result of the count operation can be read out MSB first from the DO pin.
The measurement time when the general-purpose counter is used for frequency measurement is set to either 4, 8, 32, or
64 ms by the GT0 and GT1 bits. The frequency of the input to the HCTR pin can be measured by determining how many
pulses were input to the general-purpose counter during this measurement time.
When the general-purpose counter is used to measure the frequency, the period of the signal input to LCTR pin can be
measured by counting the number of check signals input to the general-purpose counter for the one or two periods of the
signal input to the LCTR pin.
Reset the general-purpose counter in advance by setting CTE to 0 before starting the counter.
A general-purpose counter count operation is started by setting the CTE bit in the serial data to 1. The serial data takes
effect internally to the LC72151V when the CE pin input level is changed from high to low. The input to the HCTR pin
must be provided before the wait time has elapsed after CE was set low.
Next, the result of the general-purpose counter count after the measurement completes must be read out while CTE is still
set to 1. This is because the general-purpose counter is reset when CTE is set to 1.
Never fail to reset the general-purpose counter before starting the count operation of the general-purpose counter. In
addition, the signal input to LCTR pin is directly transmitted to the general-purpose counter.
Note that the signal input to the HCTR pin is first divided by 2 internally to the IC and then input to the general-purpose
counter. Therefore, the result of the general-purpose counter count is a value that corresponds to 1/2 of the frequency
actually input to the HCTR pin.
No. 6976-23/29
LC72151V
CT
Measurement
time
E=1
CE
GT
end-UC
T
: Wait time
WU
tWU
Start
Completion
Internal data
latch
(CTE)
General-
purpose
counter
CTE=0
Reset
Start
Res
Integrates
End of the count operation
tart
CTE=1
CE
GT
end-UC
(DO)
When used as an integrating counter
In integrating count mode, the count value of the general-purpose counter is accumulated. Care must be taken to handle
counter overflow correctly. The count value will be in the range 0H to FFFFFH.
Resets the general-purpose counter
Starts the general-purpose counter
Restarts the counter if set to 1 again.
1
*CTE: 0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LC72151VS-MPB-E | 制造商:ON Semiconductor 功能描述:PLL FREQUENCY SYNTHESIZER - Ammo Pack |
| LC72151VS-TRM-E | 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 |
| LC7215F | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:MW/LW PLL Frequency Synthesizers |
| LC7215FM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:MW/LW PLL Frequency Synthesizers |
| LC7216M | 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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