MB1511 Fujitsu, MB1511 Datasheet - Page 8

• Manufacturer Part Number: MB1511
• Description: Serial Input PLL Frequency Synthesizer
• Manufacturer: Fujitsu

8
MB1511
4. Phase Characteristics
FC pin is provided to change phase characteristics of phase comparator. Characteristics of internal charge pump
output level (D
monitor pin (f
(D
Note: Z = (High impedance)
Depending upon VCO characteristics, FC pin should be set accordingly:
O
, R, P) and FC input level are shown below.
fr > fp
fr = fp
fr < fp
• When VCO characteristics are like (1), FC
should be set High or open circuit; When
VCO characteristics are like (2), FC should
be set Low.
OUT
O
), phase comparator output level ( R, P) are reversed depending upon FC pin input level. Also,
) output level of phase comparator is controlled by FC pin input level. The relation between outputs
D
H
Z
L
O
FC : “H” or open
H
L
L
R
L
Z
Z
P
f
(fr)
(fr)
(fr)
OUT
D
H
Z
L
O
VCO Input Voltage
H
L
L
R
FC : “L”
Z
Z
L
P
(1)
(2)
(fp)
(fp)
(fp)
f
OUT