MB1502 Datasheet, PDF (7/15 Pages) Fujitsu Component Limited. – SERIAL INPUT PLL FREQUENCY SYNTHESIZER

MB1502
fr
fp
LD
H
Do
Z
L
NOTES: Phase difference detection range: –2π to +2π
Spike appearance depends on charge pump characteristics. Also, the spike is output in order to diminish dead band.
When f_r > f_p or f_r < f_p, spike might not appear depending upon charge pump characteristics.
ANALOG SWITCH
ON/OFF of analog switch is controlled by LE input signal. When the analog switch is ON, internal charge pump output (D_O) to be
connected to BlSW pin. When the analog switch is OFF, BlSW pin is set to high-impedance state.
LE=H (Changing the divide ratio of internal prescaler) : Analog switch=ON
LE=L (Normal operating mode): Analog switch=OFF
LPF time constant is decreased in order to insert a analog switch between LPF1 and LPF2 when channel of PLL is changing.
Thus, lock up time is decreased, that is, fast lock up time is achieved.
CHARGE PUMP
Do
LPF-1
(CONTROL SIGNAL)
ANALOG SW
BISW
LPF-2
VCO
RECOMMENDED OPERATING CONDITIONS
Parameter
Power Supply Voltage
Input Voltage
Operating Temperature
Symbol
V_CC
V_P
V_I
T_A
Min
4.5
V_CC
GND
–40
Value
Typ
5.0
V_P
Max
5.5
8.0
V_CC
85
Unit
V
V
V
_C
7