LV25200M_10 Datasheet, PDF (45/45 Pages) Sanyo Semicon Device – Single chip Tuner IC for Car Radio

LV25200M
(3) Guideline and cautions for selecting the Dead Zone mode
Features of each Dead Zone mode and criteria for selection are described below:
1) DZA mode
In the DZA mode, the correction signal is output from the charge pump even when the phase difference agrees
between the reference frequency (fr) and comparative frequency (fp), which is advantageous in obtaining the high
S/N ratio with ease. On the other hand, the side band of reference frequency component may occur, readily
causing beats in case of strong input. This is a phenomenon occurring because the PLL loop reacts sensitively due
to leak components through the mixer, modulating VCO. Occurrence of side band of reference frequency
component in the local oscillator also causes leakage of reference components to IF, which tends to worsen the
interference characteristics.
2) DZB mode
The DZB mode is characterized by the reduced voltage of correction signal from the DZA mode though, similarly
to the case of the DZA mode, the charge pump outputs the correction signal even when the phase difference
agrees between the reference frequency (fr) and comparative frequency (fp). This mode features in easier
achievement of high S/N ratio than DZC/DZD and improved beat and interference resistances.
3) DZC mode
In the DZC mode, the correction signal is output from the charge pump according to the phase difference between
the reference frequency (fr) and comparative frequency (fp). Extremely small noise may occur when the phase
difference is around 0 [ns]. Do not use this mode at low temperature (-30°C or less) because the S/N ratio may be
deteriorated.
4) DZD mode
In the DZD mode, the correction signal is output from the charge pump according to the phase difference
between the reference frequency (fr) and comparative frequency (fp). The correction signal is not output when
the phase difference is ± several [ns]. Accordingly, the S/N ratio becomes lower than other dead-zone modes, but
beat and interference resistances can be improved.
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PS No.A0976-45/45