參數(shù)資料
型號(hào)： MB15F08SLPV1
廠商： FUJITSU LTD
元件分類： XO, clock
英文描述： Dual Serial Input PLL Frequency Synthesizer
中文描述： PLL FREQUENCY SYNTHESIZER, 2500 MHz, PBCC16
封裝： PLASTIC, BCC-16
文件頁(yè)數(shù)： 11/27頁(yè)
文件大小： 239K
代理商： MB15F08SLPV1
11
MB15F08SL
Table.9 Charge Pump Current Setting
Power Saving Mode (Intermittent Mode Control Circuit)
Table.10 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 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 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.
Note:
When power (V
CC
) is first applied, the device must be in standby mode, PS = Low, for at least 1
μ
s.
Note:
PS pin must be set “L” for Power-ON.
CS
Current value
±
6.0 mA
±
1.5 mA
H
L
PS pin
Status
H
Normal mode
L
Power saving mode
ON
OFF
V
CC
Clock
Data
LE
PS
(1)
(2)
(3)
t
V
≥
1
μ
s
tps
≥
100 ns
(1) PS = L (power saving mode) at Power-ON
(2) Set serial data
1
μ
s
later after power supply remains stable (VCC
>
2.2 V).
(3) Release power saving mode (PS : L
→
H) 100 ns later after setting serial data.
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