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CS2000-OTP
Cirrus Logic CS2000-OTP Manuals
Manuals and User Guides for Cirrus Logic CS2000-OTP. We have
1
Cirrus Logic CS2000-OTP manual available for free PDF download: General Description Manual
Cirrus Logic CS2000-OTP General Description Manual (30 pages)
Fractional-N clock synthesizer & clock multiplier
Brand:
Cirrus Logic
| Category:
Synthesizer
| Size: 1 MB
Table of Contents
General Description
1
Table of Contents
2
1 Pin Description
4
2 Typical Connection Diagram
5
Figure 1. Typical Connection Diagram
5
Clk_Out
5
Xti/Ref_Clk
5
Aux_Out
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
Figure 2. CLK_IN Sinusoidal Jitter Tolerance
8
Figure 3. CLK_IN Sinusoidal Jitter Transfer
8
Figure 4. CLK_IN Random Jitter Rejection and Tolerance
8
4 Architecture Overview
9
Delta-Sigma Fractional-N Frequency Synthesizer
9
Hybrid Analog-Digital Phase Locked Loop
9
Figure 5. Delta-Sigma Fractional-N Frequency Synthesizer
9
Figure 6. Hybrid Analog-Digital PLL
10
Figure 7. Fractional-N Source Selection Overview
10
Fractional-N Source Selection for the Frequency Synthesizer
10
5 Applications
11
One Time Programmability
11
Timing Reference Clock Input
11
Internal Timing Reference Clock Divider
11
Figure 8. Internal Timing Reference Clock Divider
11
Table 1. Modal and Global Configuration
11
Crystal Connections (XTI and XTO)
12
External Reference Clock (REF_CLK)
12
Frequency Reference Clock Input, CLK_IN
12
Figure 10. External Component Requirements for Crystal Circuit
12
Figure 9. REF_CLK Frequency Vs. a Fixed CLK_OUT
12
Adjusting the Minimum Loop Bandwidth for CLK_IN
13
Figure 11. Low Bandwidth and New Clock Domain
13
Figure 12. High Bandwidth with CLK_IN Domain Re-Use
13
Output to Input Frequency Ratio Configuration
14
User Defined Ratio (RUD), Frequency Synthesizer Mode
14
User Defined Ratio (RUD), Hybrid PLL Mode
14
Ratio Modifier (R-Mod)
15
Effective Ratio (REFF)
15
Fractional-N Source Selection
15
Table 2. Ratio Modifier
15
Automatic Fractional-N Source Selection for the Frequency Synthesizer
16
Manual Fractional-N Source Selection for the Frequency Synthesizer
16
Ratio Configuration Summary
17
Figure 13. Ratio Feature Summary
17
PLL Clock Output
18
Auxiliary Output
18
Figure 14. PLL Clock Output Options
18
Figure 15. Auxiliary Output Selection
18
Mode Pin Functionality
19
M1 and M0 Mode Pin Functionality
19
M2 Mode Pin Functionality
19
M2 Configured as Output Disable
19
M2 Configured as R-Mod Enable
19
Figure 16. M2 Mapping Options
19
M2 Configured as Auto Fractional-N Source Selection Disable
20
M2 Configured as Fractional-N Source Select
20
M2 Configured as Auxoutsrc Override
20
Clock Output Stability Considerations
20
Output Switching
20
PLL Unlock Conditions
21
Required Power up Sequencing for Programmed Devices
21
6 Parameter Descriptions
22
Modal Configuration Sets
22
R-Mod Selection (Rmodsel[1:0])
22
Figure 17. Parameter Configuration Sets
22
Auxiliary Output Source Selection (Auxoutsrc[1:0])
23
Lock Clock Ratio (Lockclk[1:0])
23
Fractional-N Source for Frequency Synthesizer (Fracnsrc)
23
Ratio 0 - 3
23
Clk_In
23
Global Configuration Parameters
24
AUX PLL Lock Output Configuration (Auxlockcfg)
24
Reference Clock Input Divider (Refclkdiv[1:0])
24
Enable PLL Clock Output on Unlock (Clkoutunl)
24
Low-Frequency Ratio Configuration (Lfratiocfg)
24
Aux_Out
24
M2 Pin Configuration (M2Config[2:0])
25
Clock Input Bandwidth (Clkin_Bw[2:0])
25
Clk_In
25
7 Calculating the User Defined Ratio
26
High Resolution 12.20 Format
26
High Multiplication 20.12 Format
26
Table 3. Example 12.20 R-Values
26
Table 4. Example 20.12 R-Values
26
8 Programming Information
27
9 Package Dimensions
28
Thermal Characteristics
28
10 Ordering Information
29
11 Revision History
29
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