MB1502 Datasheet, PDF (6/15 Pages) Fujitsu Component Limited. – SERIAL INPUT PLL FREQUENCY SYNTHESIZER

MB1502
Data S18=MSB S17
*(SW) (S14)
Clock
Serial Data Input Timing
S10 S9
(S8) (S7)
S1=LSB
(S1)
(C: Control bit)
(C: Control bit)
LE
t₁
t₂
t₃
t₁ – t₅ ≥ 1µs
NOTES: Parenthesis data is used for setting divide ratio of programmable reference divider.
On rising edge of clock shifts one bit of data in the shift register.
t₅
t₄
PHASE CHARACTERISTICS
FC pin is provided to change phase characteristics of phase comparator. Characteristics of internal charge pump output level (D_o),
phase comparator output level (∅R, ∅P) are reversed depending upon FC pin input level. Also, monitor pin (f_OUT) output level of phase
comparator is controlled by FC pin input level. The relation between outputs (D_O, ∅R, ∅P) and FC input level are shown below.
f_r > f_p
f_r < f_p
f_r = f_p
FC=H or open
FC=L
D_O
∅R
∅P
f_OU
T
D_O
∅R
∅P
f_OU
T
H
L
L
(f_r)
L
H
Z
(f_p)
L
H
Z
(f_r)
H
L
L
(f_p)
Z
L
Z
(f_r)
Z
L
Z
(f_p)
Note: Z = (High impedance)
1
2
VCO INPUT VOLTAGE
6
VCO CHARACTERISTICS
Depending upon VCO characteristics,
FC pin should be set accordingly:
— When VCO characteristics are like1,
FC should be set High or open circuit;
— When VCO characteristics are like 2,
FC should be set Low.