LV25200M Datasheet, PDF (44/45 Pages) Sanyo Semicon Device – Bi-CMOS IC Single chip Tuner IC for Car Radio

LV25200M
Output characteristics of the phase comparator/charge pump are shown in Fig. 2.
The phase comparator outputs the output Vφ that is proportional to the phase differenceφ between fr and fp. By
changing the setting of phase comparator dead zone mode, characteristics of phase comparator can be changed.
Namely, the modes (DZA, DZB) to turn ON both P-CH and N-CH transistors of charge pump in case of extremely
small phase difference and the mode (DZD) not to output the phase difference output in case of extremely small
phase difference can be set.
Fig. 2 Phase comparator/charge pump characteristics
Vφ[V]
DZA mode
fp > fr
Vφ[V]
DZB mode
fp > fr
fr > fp
φ err [ns]
Dead Zone (--)
fr > fp
φ err [ns]
Dead Zone(-)
Vφ[V]
DZC mode
fp > fr
fr > fp
φ err [ns]
Dead Zone≈0
Vφ[V]
DZD mode
fp > fr
fr > fp
φ err [ns]
Dead Zone (+)
(2) Characteristics of the Dead Zone mode
The table below outlines characteristics in each dead zone mode.
Set data
DZ1 DZ0
Dead zone mode
Charge pump at phase difference 0
(Pch/Nch)
0
0
DZA
ON/ON
0
1
DZB
ON/ON
1
0
DZC
ON or OFF
1
1
DZD
OFF/OFF
Dead zone width
(Reference data)
-- (-15[ns])
- (-8[ns])
≈0 (0[ns])
+ (+8[ns])
Remarks
Do not use
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