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參數(shù)資料
| 型號： | MB15F74UV_04 |
| 廠商： | Fujitsu Limited |
| 英文描述： | Dual Serial Input PLL Frequency Synthesizer |
| 中文描述： | 雙串行輸入鎖相環(huán)頻率合成器 |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 131K |
| 代理商： | MB15F74UV_04 |
MB15F74UV
11
3.
Power Saving Mode (Intermittent Mode Control Circuit)
Status
PS pin
The intermittent mode control circuit reduces the PLL power consumption.
By setting the PS pin low, the device enters into the power saving mode, reducing the current consumption. See
the Electrical Characteristics chart for the specific value.
The phase detector output, Do, becomes high impedance.
For the dual PLL, the lock detector, LD, is as shown in the LD Output Logic table.
Setting the PS pin high, releases the power saving mode, and the device works normally.
The intermittent mode control circuit also ensures a smooth startup when the device returns to normal operation.
When the PLL is returned to normal operation, the phase comparator output signal is unpredictable. This is
because of the unknown relationship between the comparison frequency (fp) and the reference frequency (fr)
which can cause a major change in the comparaor output, resulting in a VCO frequency jump and an increase
in lockup time.
To prevent a major VCO frequency jump, the intermittent mode control circuit limits the magnitude of the error
signal from the phase detector when it returns to normal operation.
Notes :
When power (VCC) is first applied, the device must be in standby mode.
PS pin must be set “L” at Power-ON.
Normal mode
H
Power saving mode
L
ON
OFF
V
CC
Clock
Data
LE
PS
(1)
(2)
(3)
t
PS
≥
100 ns
t
V
≥
1
μ
s
(1) PS
=
L (power saving mode) at Power-ON
(2) Set serial data at least 1
μ
s after the power supply becomes stable (V
CC
≥
2.2 V) .
(3) Release power saving mode (PS
IF
, PS
RF
: “L”
→
“H”) at least 100 ns later after setting serial data.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB15F74UVPVB | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Dual Serial Input PLL Frequency Synthesizer |
| MB15F76UL | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Dual Serial Input PLL Frequency Synthesizer |
| MB15F76UL_02 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Dual Serial Input PLL Frequency Synthesizer |
| MB15F76ULPVA | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Dual Serial Input PLL Frequency Synthesizer |
| MB15F76UV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:ASSP Dual Serial Input PLL Frequency Synthesizer(Small Package) |
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