MB15A02 Fujitsu Microelectronics, MB15A02 Datasheet - Page 7

• Manufacturer Part Number: MB15A02
• Description: Low Power Serial Input PLL Synthesizer With 1.1ghz Prescaler
• Manufacturer: Fujitsu Microelectronics

Serial data input timing
PHASE CHARACTERISTICS
FC pin is provided to change phase characteristics of phase
comparator. Characteristics of internal charge pump output level (D
phase comparator output level ( R,
upon FC pin input level. Also, monitor pin (fout) output level of phase
comparator is controlled by FC pin input level. The relation between
outputs (D
Depending upon VCO characteristics, FC pin should be set accordingly:
When VCO characteristics are like
When VCO characteristics are like
Note:
t
t
1
4
( 100ns) : Data setup time
( 100ns) : LE setup time to the rising edge of last clock
Note:
fr>fp
fr<fp
fr=fp
1 : Bits enclosed in parentheses are used when the divide ratio of the programmable reference divider is selected.
O
Z=(High impedance)
,
R,
One bit of data is shifted into the shift register on the rising edge of the clock.
P) and FC input level are shown below.
DO
Clock
H
L
Z
Data
FC=H or open
LE
H
L
L
R
(SW) ( 1)
S18 =
MSB
Z
Z
L
P fout
t
1
2
1
, FC should be set High or open circuit;
, FC should be set Low.
(fr)
(fr)
(fr)
P) are reversed depending
(S14)
t
S17
2
DO
H
Z
( 1000ns) : Data hold time
L
H
L
L
R
FC=L
t
2
Z
Z
L
(S8)
P
S10
fout
(fp)
(fp)
(fp)
O
),
S9
(S7)
VCO CHARACTERISTICS
t
3
S1 =
(S1)
LSB
VCO INPUT VOLTAGE
t
t
3
5
( 300ns) : Clock pulse width
( 800ns) : LE pulse width
(C: Control bit)
C: Control bit
t
5
t
4
MB15A02
1
2
7