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CS2100P-CZZ Datasheet(PDF) 2 Page - Cirrus Logic

No. de pieza CS2100P-CZZ
Descripción Electrónicos  Fractional-N Clock Multiplier
Download  26 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS2100P-CZZ Datasheet(HTML) 2 Page - Cirrus Logic

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CS2100-OTP
DS841F1
2
TABLE OF CONTENTS
1. PIN DESCRIPTION ................................................................................................................................. 4
2. TYPICAL CONNECTION DIAGRAM ..................................................................................................... 5
3. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 6
RECOMMENDED OPERATING CONDITIONS .................................................................................... 6
ABSOLUTE MAXIMUM RATINGS ........................................................................................................ 6
DC ELECTRICAL CHARACTERISTICS ................................................................................................ 6
AC ELECTRICAL CHARACTERISTICS ................................................................................................ 7
PLL PERFORMANCE PLOTS ............................................................................................................... 8
4. ARCHITECTURE OVERVIEW ............................................................................................................... 9
4.1 Delta-Sigma Fractional-N Frequency Synthesizer ........................................................................... 9
4.2 Hybrid Analog-Digital Phase Locked Loop ...................................................................................... 9
5. APPLICATIONS ................................................................................................................................... 11
5.1 One Time Programmability ............................................................................................................ 11
5.2 Timing Reference Clock Input ........................................................................................................ 11
5.2.1 Internal Timing Reference Clock Divider ............................................................................... 11
5.2.2 Crystal Connections (XTI and XTO) ...................................................................................... 12
5.2.3 External Reference Clock (REF_CLK) .................................................................................. 12
5.3 Frequency Reference Clock Input, CLK_IN ................................................................................... 12
5.3.1 Adjusting the Minimum Loop Bandwidth for CLK_IN ............................................................ 13
5.4 Output to Input Frequency Ratio Configuration ............................................................................. 14
5.4.1 User Defined Ratio (RUD) ..................................................................................................... 14
5.4.2 Ratio Modifier (R-Mod) .......................................................................................................... 15
5.4.3 Effective Ratio (REFF) .......................................................................................................... 15
5.4.4 Ratio Configuration Summary ............................................................................................... 15
5.5 PLL Clock Output ........................................................................................................................... 16
5.6 Auxiliary Output .............................................................................................................................. 17
5.7 Mode Pin Functionality ................................................................................................................... 17
5.7.1 M1 and M0 Mode Pin Functionality ....................................................................................... 17
5.7.2 M2 Mode Pin Functionality .................................................................................................... 18
5.7.2.1 M2 Configured as Output Disable .............................................................................. 18
5.7.2.2 M2 Configured as R-Mod Enable .............................................................................. 18
5.7.2.3 M2 Configured as AuxOutSrc Override ..................................................................... 18
5.8 Clock Output Stability Considerations ............................................................................................ 19
5.8.1 Output Switching ................................................................................................................... 19
5.8.2 PLL Unlock Conditions .......................................................................................................... 19
5.9 Required Power Up Sequencing for Programmed Devices ........................................................... 19
6. PARAMETER DESCRIPTIONS ........................................................................................................... 20
6.1 Modal Configuration Sets ............................................................................................................... 20
6.1.1 R-Mod Selection (RModSel[1:0]) ...........................................................................................20
6.1.2 Auxiliary Output Source Selection (AuxOutSrc[1:0]) ............................................................. 21
6.2 Ratio 0 - 3 ...................................................................................................................................... 21
6.3 Global Configuration Parameters ................................................................................................... 21
6.3.1 AUX PLL Lock Output Configuration (AuxLockCfg) .............................................................. 21
6.3.2 Reference Clock Input Divider (RefClkDiv[1:0]) .................................................................... 21
6.3.3 Enable PLL Clock Output on Unlock (ClkOutUnl) ................................................................. 22
6.3.4 Low-Frequency Ratio Configuration (LFRatioCfg) ................................................................ 22
6.3.5 M2 Pin Configuration (M2Config[2:0]) ................................................................................... 22
6.3.6 Clock Input Bandwidth (ClkIn_BW[2:0]) ................................................................................ 22
7. CALCULATING THE USER DEFINED RATIO .................................................................................... 23
7.1 High Resolution 12.20 Format ....................................................................................................... 23
7.2 High Multiplication 20.12 Format ................................................................................................... 23
8. PROGRAMMING INFORMATION ........................................................................................................ 24


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