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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS5376A датащи(PDF) 24 Page - Cirrus Logic |
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CS5376A датащи(HTML) 24 Page - Cirrus Logic |
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24 / 107 page  CS5376A 24 6. CLOCK GENERATION The CS5376A requires a 32.768 MHz master clock input, which is used to generate internal digital fil- ter clocks and external modulator clocks. 6.1 Pin Description CLK - Pin 58 Clock input, nominal frequency 32.768 MHz. 6.2 Synchronous Clocking To guarantee synchronous measurements through- out a sensor network, the CS5376A master clock should be distributed to arrive at all nodes in phase. The 32.768 MHz master clock can either be direct- ly distributed through the system telemetry, or re- constructed locally using a VCXO based PLL. To ensure recovered clocks have identical phase, sys- tem PLL designs should use a phase/frequency de- tector architecture. 6.3 Master Clock Jitter and Skew Care must be taken to minimize jitter and skew in the received master clock as both parameters affect measurement performance. Jitter in the master clock causes jitter in the gener- ated modulator clocks, resulting in sample timing errors and increased noise. Skew in the master clock from node to node creates a sample timing offset, resulting in systematic mea- surement errors in the reconstructed signal. Clock Divider CLK DSPCFG Register MCLK Internal Clocks Figure 12. Clock Generation Block Diagram and Generator MCLK Output |
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