CS2300-CP(2008) 데이터 시트보기 (PDF) - Cirrus Logic

부품명

상세내역

제조사

CS2300-CP
(Rev.:2008)

Fractional-N Clock Multiplier with Internal LCO

Cirrus Logic 

5.3.5

CS2300-CP

Ratio Configuration Summary

The RUD is the user defined ratio stored in the register space. The resolution for the RUD is selectable by

setting LFRatioCfg. R-Mod is applied if selected. The user defined ratio, ratio modifier, and automatic ratio

modifier make up the effective ratio REFF, the final calculation used to determine the output to input clock

ratio. The conceptual diagram in Figure 12 summarizes the features involved in the calculation of the ratio

values used to generate the fractional-N value which controls the Frequency Synthesizer.

LCO

Effective Ratio REFF

Frequency

Synthesizer

PLL Output

User Defined Ratio RUD

Ratio

Ratio Format

12.20

20.12

RModSel[2:0]

Ratio

Modifier

Auto

R-Mod

N

Digital PLL &

Fractional N Logic

LFRatioCfg

AutoRMod

FsDet[1:0]

Frequency Reference Clock

(CLK_IN)

Figure 12. Ratio Feature Summary

Referenced Control

Register Location

Ratio......................................“Ratio (Address 06h - 09h)” on page 27

LFRatioCfg ............................“Low-Frequency Ratio Configuration (LFRatioCfg)” on page 28

RModSel[2:0] ........................“R-Mod Selection (RModSel[2:0])” section on page 25

AutoRMod .............................“Auto R-Modifier Enable (AutoRMod)” on page 25

FsDet[1:0]..............................“PLL Input Sample Rate Indicator (FsDet[1:0]) - Read Only” section on page 24

18

DS843PP1

Share Link: