UPD17062 datasheet(228/298 Pages) RENESAS

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UPD17062 데이터시트(PDF) 228 Page - Renesas Technology Corp

부품명	UPD17062

상세설명	MOS INTEGRATED CIRCUIT

PDF	298 Pages

Scroll/Zoom	100%

제조업체	RENESAS [Renesas Technology Corp]

홈페이지	http://www.renesas.com

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228 / 298 page

226

µPD17062

18.5.2

Functions of the Phase Comparator (

φ-DET)

As shown in Fig. 18-5, the phase comparator compares the phase of the output frequency “fN” of the

programmable divider (PD) and the phase of the reference frequency “fr”, and outputs the up request signal

(UP) or down request signal (DW).

If the divider output frequency fN is lower than the reference frequency fr, the phase comparator outputs

an up request. If fN is higher than fr, the phase comparator outputs a down request.

Fig. 18-6 shows the relationship among the reference frequency fr, divider output frequency fN, up request

UP, and down request DW.

In the PLL disable mode, neither up nor down request is output.

The up and down requests are directed to the charge pump and unlock detection block.

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