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CS2000CP-EZZ датащи(PDF) 2 Page - Cirrus Logic

номер детали CS2000CP-EZZ
подробное описание детали  Fractional-N Clock Synthesizer & Clock Multiplier
Download  37 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS2000CP-EZZ датащи(HTML) 2 Page - Cirrus Logic

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CS2000-CP
2
DS761F3
TABLE OF CONTENTS
1. PIN DESCRIPTION ................................................................................................................................. 5
2. TYPICAL CONNECTION DIAGRAM ..................................................................................................... 6
3. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 7
RECOMMENDED OPERATING CONDITIONS .................................................................................... 7
ABSOLUTE MAXIMUM RATINGS ........................................................................................................ 7
DC ELECTRICAL CHARACTERISTICS ................................................................................................ 7
AC ELECTRICAL CHARACTERISTICS ................................................................................................ 8
PLL PERFORMANCE PLOTS ............................................................................................................... 9
CONTROL PORT SWITCHING CHARACTERISTICS- I²C FORMAT ................................................. 10
CONTROL PORT SWITCHING CHARACTERISTICS - SPI FORMAT ............................................... 11
4. ARCHITECTURE OVERVIEW ............................................................................................................. 12
4.1 Delta-Sigma Fractional-N Frequency Synthesizer ......................................................................... 12
4.2 Hybrid Analog-Digital Phase Locked Loop ....................................................................................12
4.2.1 Fractional-N Source Selection for the Frequency Synthesizer .............................................. 13
5. APPLICATIONS ................................................................................................................................... 14
5.1 Timing Reference Clock Input ........................................................................................................ 14
5.1.1 Internal Timing Reference Clock Divider ............................................................................... 14
5.1.2 Crystal Connections (XTI and XTO) ...................................................................................... 15
5.1.3 External Reference Clock (REF_CLK) .................................................................................. 15
5.2 Frequency Reference Clock Input, CLK_IN ................................................................................... 15
5.2.1 CLK_IN Skipping Mode ......................................................................................................... 15
5.2.2 Adjusting the Minimum Loop Bandwidth for CLK_IN ............................................................ 17
5.3 Output to Input Frequency Ratio Configuration ............................................................................. 19
5.3.1 User Defined Ratio (RUD), Frequency Synthesizer Mode .................................................... 19
5.3.2 User Defined Ratio (RUD), Hybrid PLL Mode ....................................................................... 19
5.3.3 Ratio Modifier (R-Mod) .......................................................................................................... 20
5.3.4 Effective Ratio (REFF) .......................................................................................................... 20
5.3.5 Fractional-N Source Selection ............................................................................................... 21
5.3.6 Ratio Configuration Summary ............................................................................................... 22
5.4 PLL Clock Output ........................................................................................................................... 23
5.5 Auxiliary Output .............................................................................................................................. 23
5.6 Clock Output Stability Considerations ............................................................................................ 24
5.6.1 Output Switching ................................................................................................................... 24
5.6.2 PLL Unlock Conditions .......................................................................................................... 24
5.7 Required Power Up Sequencing .................................................................................................... 24
6. SPI / I²C CONTROL PORT ................................................................................................................... 24
6.1 SPI Control ..................................................................................................................................... 25
6.2 I²C Control ...................................................................................................................................... 25
6.3 Memory Address Pointer ............................................................................................................... 27
6.3.1 Map Auto Increment .............................................................................................................. 27
7. REGISTER QUICK REFERENCE ........................................................................................................ 27
8. REGISTER DESCRIPTIONS ................................................................................................................ 28
8.1 Device I.D. and Revision (Address 01h) ........................................................................................ 28
8.1.1 Device Identification (Device[4:0]) - Read Only ..................................................................... 28
8.1.2 Device Revision (Revision[2:0]) - Read Only ........................................................................ 28
8.2 Device Control (Address 02h) ........................................................................................................ 28
8.2.1 Unlock Indicator (Unlock) - Read Only .................................................................................. 28
8.2.2 Auxiliary Output Disable (AuxOutDis) ................................................................................... 28
8.2.3 PLL Clock Output Disable (ClkOutDis) .................................................................................. 29
8.3 Device Configuration 1 (Address 03h) ........................................................................................... 29
8.3.1 R-Mod Selection (RModSel[2:0]) ...........................................................................................29
8.3.2 Ratio Selection (RSel[1:0]) .................................................................................................... 29


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