MB1501 Fujitsu, MB1501 Datasheet - Page 6

• Manufacturer Part Number: MB1501
• Description: SERIAL INPUT PLL FREQUENCY SYNTHESIZER
• Manufacturer: Fujitsu

MB1501
MB1501H
MB1501L
6
On the rising edge of the clock shifts one bit of the data into the shift registers.
Parenthsis data is used for setting the divide ratio of the programmable reference divider.
PHASE CHARACTERISTICS
FC pin (pin 12) is provided to inverse the phase comparator
characteristics. The characteristics of internal charge pump output
(D
upon FC input data. Outputs are shown below.
Depending upon VCO characteristics, FC pin should be set accord-
ingly:
When VCO characteristics are like
circuit;
When VCO characteristics are like
Note: Z=(High impedance)
O
), phase detector outputs ( R, P) can be inversed depending
f
f
f
r
r
r
>f
<f
=f
Clock
Data
p
p
p
LE
t
1
S18=MSB
– t
5
D
*(SW)
H
Z
L
FC=H (or open)
O
t
1 s
1
H
(S14)
L
L
S17
R
1
2
, FC should be set high or open
, FC should be set Low.
Z
Z
L
P
D
SERIAL DATA INPUT TIMING
H
Z
L
O
FC=L
t
H
2
L
L
R
S10
(S8)
Z
Z
L
P
(S7)
S9
VCO CHARACTERISTICS
t
3
S1=LSB
VCO INPUT VOLTAGE
(S1)
(C: Control bit)
C: Control bit
t
4
t
5
1
2