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ADAV801 датащи(PDF) 18 Page - Analog Devices |
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ADAV801 датащи(HTML) 18 Page - Analog Devices |
18 / 61 page ADAV801 Rev. A | Page 17 of 60 Selecting a Sample Rate The output sample rate of the ADC is always ADC MCLK/256, as shown in Figure 23. By default, the ADC modulator runs at ADC MCLK/2. When the ADC MCLK exceeds 12.288 MHz, the ADC modulator should be set to run at ADC MCLK/4. This is achieved by setting the AMC (ADC Modulator Clock) bit in the ADC Control Register 1. To compensate for the reduced modulator clock speed, a different set of filters are used in the decimator section, ensuring that the sample rate remains the same. The AMC bit can also be used to boost the THD + N perform- ance of the ADC at the expense of dynamic range. The improvement is typically 0.5 dB to 1.0 dB and works because selecting the lower modulator rate reduces the amount of digital noise, improving THD + N, but also reduces the oversampling ratio, therefore reducing the dynamic range by a corresponding amount. For best performance of the ADC, avoid using similar frequency clocks from separate sources in the ADAV801. For example, running the ADC from a 12.288 MHz clock connected to MCLKI and using the PLL to generate a separate 12.288 MHz clock for the DAC can reduce the performance of the ADC. This is due to the interaction of the clocks, which generate beat frequencies that can affect the charge on the switch capacitors of the analog inputs. WAIT FOR SAMPLE WAIT FOR SAMPLE WAIT FOR SAMPLE DECREASE GAIN BY 0.5dB AND WAIT ATTACK TIME IS A RECOVERY MODE ENABLED? IS SAMPLE GREATER THAN ATTACK THRESHOLD? IS SAMPLE ABOVE ATTACK THRESHOLD? ARE ALL SAMPLES BELOW RECOVERY THRESHOLD? HAS GAIN BEEN FULLY RESTORED? YES YES YES NO YES YES NO NO NORMAL RECOVERY INCREASE GAIN BY 0.5dB WAIT RECOVERY TIME LIMITED RECOVERY ATTACK MODE IS SAMPLE ABOVE ATTACK THRESHOLD? ARE ALL SAMPLES BELOW RECOVERY THRESHOLD? HAS GAIN BEEN FULLY RESTORED? IS GAINCNTR AT MAXIMUM? YES NO NO YES YES YES NO NO INCREASE GAIN BY 0.5dB NO INCREMENT GAINCNTR NO NO NO HAS RECOVERY TIME BEEN REACHED? HAS RECOVERY TIME BEEN REACHED? Figure 26. ALC Flow Diagram |
Аналогичный номер детали - ADAV801_17 |
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Аналогичное описание - ADAV801_17 |
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