MB1508 Fujitsu Microelectronics, Inc., MB1508 Datasheet - Page 6

• Manufacturer Part Number: MB1508
• Description: Serial Input PLL Frequency Synthesizer on Chip 2.5 GHZ Prescaler
• Manufacturer: Fujitsu Microelectronics, Inc.

NOTES: On rising edge of the clock shifts one bit of data into the shift register.
PHASE DETECTOR CHARACTERISTICS
FC pin selects the phase of the phase detector. Phase characteristics (charge pump output) can be reversed depending upon the FC pin
input level. Monitor pin (f
.
Note:
6
MB1508
frequency
f
f
f
r
r
r
output
VCO
> f
= f
< f
When LE is high, the data stored in the shift register is transferred into the latch.
Z = (High impedance)
p
p
p
Note:
1 : Bits enclosed in parentheses are used when the divide ratio of the programmable reference divider is selected.
One bit of data is shifted into the shift register on the rising edge of the clock.
D
o1,
LPF input voltage
Clock
H
Z
OUT
L
Data
D
LE
o2
) output level is selected by FC pin input level as well
(SW) ( 1)
FC=H or open
S18 =
MSB
t1
reference divider output
Outputs programmable
Outputs programmable
frequency f
frequency f
(S14)
S17
f
OUT
Serial Data Input Timing
1
2
r
.
t2
p
(S8)
S10
D
(S7)
S9
O,
Z
H
L
D
02
VCO CHARACTERISTICS
Depending upon VCO polarity,
FC pin should be set accordingly:
— When VCO polarity are like
— When VCO polarity are like
t3
FC should be set High or open.
FC should be set Low.
S1 =
(S1)
LSB
FC=L
Outputs programmable
Outputs programmable
divider output
(C: Control bit)
frequency f
frequency f
C: Control bit
t5
f
OUT
p
p
.
t4