MB15F04 Fujitsu Media Devices, MB15F04 Datasheet - Page 13

• Manufacturer Part Number: MB15F04
• Description: Dual Serial Input PLL Frequency Synthesizer
• Manufacturer: Fujitsu Media Devices

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is output from the BS
The analog switch is set on or off by the BSC
As in the example shown in the figure below, placing the analog switch midway through the LPF (LPF1 + LPF2)
allows the LPF time constant to be reduced during PLL channel switching so as to speed up the lock up time.
ANALOG SWITCH (BSC
Analog switch
OFF
CHP
ON
TX
pin. (The pin goes to high impedance when the switch is off.)
Do
TX
TX
BSC
Pin)
H
L
TX
Analog
swtch
LPF1
TX
input. When the switch is on, the output of the charge pump (Do
BSC
TX
BS
TX
LPF2
VCO
MB15F04
TX
)
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