187
CHAPTER 13 PLL FREQUENCY SYNTHESIZER
User’s Manual U15104EJ2V0UD
Figure 13-9. Relationship Between f
r
, f
N
, UP, and DW
(a) If f
r
advances f
N
in phase
(4) Operation of charge pump
The charge pump outputs the result of the up request (UP) or down request (DW) signal from the phase
comparator (
φ
-DET) from the error out pins (EO0 and EO1 pins). Table 13-3 shows the output signals.
The EO0 and EO1 pins are of voltage-driven type pins.
Figure 13-10 shows the configuration of the error out pins.
(d) If f
N
is lower than f
r
(c) If f
N
and f
r
are in phase
(b) If f
N
advances f
r
in phase
f
r
f
N
UP
DW
f
r
f
N
UP
DW
f
r
f
N
UP
DW
f
r
f
N
UP
DW
Содержание mPD178053
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