MB1507 Fujitsu Microelectronics, Inc., MB1507 Datasheet - Page 7

• Manufacturer Part Number: MB1507
• Description: Serial Input PLL Frequency Synthesizer
• Manufacturer: Fujitsu Microelectronics, Inc.

PHASE DETECTOR OUTPUT WAVEFORM (FC=High)
ANALOG SWITCH
ON/OFF of analog switch is controlled by LE input signal. When the analog switch is ON, internal charge pump output (D
When the analog switch is OFF, BI-SW pin is set to high-impedance state.
When an analog switch is inserted between LP1 and LP2, faster lock up time is achieved to reduce LPF time constant during PLL channel switching.
H(Changing the divide ratio of internal prescaler)
L(Normal operating mode)
NOTES: Phase difference detection range: –2 to +2
f
f
LD
D
r
P
O
Spike appearance depends on charge pump characteristics. Also, the spike is output in order to diminish dead band.
When f
CHARGE PUMP
(CONTROL SIGNAL LE)
f
r
r
>f
>f
p
p
H
or f
r
<f
LE
p
, spike might not appear depending upon charge pump characteristics.
f
r
D
=f
O
p
ANALOG SW
Z
LPF-1
Analog Switch
f
r
<f
OFF
ON
p
L
BISW
f
r
<f
LPF-2
p
f
r
<f
p
O
) is connected to BISW pin.
V
CO
MB1507
7