參數(shù)資料
型號(hào)： MB15E07SRPV1
廠商： FUJITSU LTD
元件分類： XO, clock
英文描述： Single Serial Input PLL Frequency Synthesizer On-chip 2.5 GHz Prescaler
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PBCC16
封裝： PLASTIC, BCC-16
文件頁(yè)數(shù)： 11/25頁(yè)
文件大?。?/td> 156K
代理商： MB15E07SRPV1
MB15E07SR
11
When designing a synthesizer, the FC pin setting depends on the VCO and LPF characteristics.
3. Power Saving Mode (Intermittent Mode Control Circuit)
Table 9. PS Pin Setting
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 signal PLL, the lock detector, LD, remains high, indicating a locked condition.
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 comparator 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.
PS pin
Status
H
Normal mode
L
Power saving mode
(1)
(2)
When the LPF and VCO characteristics are similar
to (1), set FC bit high.
When the VCO characteristics are similar to (2),
set FC bit low.
VCO
Output
Frequency
LPF Output Voltage
PLL
LPF
VCO
Note : Give attention to the polarity for using active type LPF.
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