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PCM9211 Datasheet(PDF) 19 Page - Texas Instruments |
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PCM9211 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 121 page ![]() SystemClock (SCK) "L" "H" 0.8V 2V t SCL t SCH t SCY PCM9211 www.ti.com SBAS495 – JUNE 2010 ADC Details System Clock The system clock for the ADC of the PCM9211 must be either 256fS or 512fS, where fS is the audio sampling rate for the ADC (16 kHz to 96 kHz). Table 3 lists the typical system clock frequencies fSCK for common audio sampling rates. Figure 13 shows the timing requirements for the system clock inputs. Table 3. ADC Clock Requirements BIT CLOCK FREQUENCY SYSTEM CLOCK FREQUENCY SAMPLING FREQUENCY 64fS 256fS 512fS 16 kHz 1.024 MHz 4.0960 MHz 8.1920 MHz 32 kHz 2.048 MHz 8.1920 MHz 16.3840 MHz 44.1 kHz 2.8224 MHz 11.2896 MHz 22.5792 MHz 48 kHz 3.072 MHz 12.2880 MHz 24.5760 MHz 88.2 kHz 5.6448 MHz 22.5792 MHz See (1) 96 kHz 6.144 MHz 24.5760 MHz See (1) (1) This system clock frequency is not supported for the given sampling clock frequency SYMBOL DESCRIPTION MIN MAX UNITS tSCY System clock cycle time 30 ns tSCH System clock high time 0.4 tSCY ns tSCL System clock low time 0.4 tSCY ns System clock duty cycle 40 60 % Note: This timing requirement is applied when ADC clock source (Register 42h/ADCLK) is AUXIN0, AUXIN1 or AUXIN2. Figure 13. ADC System Clock Input Timing Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 19 Product Folder Link(s): PCM9211 |
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