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AD74111 데이터시트(PDF) 9 Page - Analog Devices |
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AD74111 데이터시트(HTML) 9 Page - Analog Devices |
9 / 21 page REV. 0 –8– AD74111 FUNCTIONAL DESCRIPTION General Description The AD74111 is a 2.5 V mono codec. It comprises an ADC and DAC channel with single-ended input and output. The ADC has a programmable gain stage and the DAC has programmable volume control. Each of these sections is described in further detail below. The AD74111 is controlled by means of a flexible serial port (SPORT) that can be programmed to accommodate many industry standard DSPs and microcontrollers. The AD74111 can be set to operate as a master or slave device. The AD74111 can be set to operate with sample rates of 8 kHz to 48 kHz, depending on the values of MCLK and the MCLK prescalers. On-chip digital filtering is provided as part of the DAC and ADC channels with a low group delay option to reduce the delays through the filters when operating at lower sample rates. Figure 4 shows a block diagram of the DAC and ADC channel in the AD74111. Figures 5a and 5b show block diagrams of the filter arrangements of the ADC and DAC filters. ADC Section The AD74111 contains a multibit sigma-delta ADC. The ADC has a single input pin with additional pins for decoupling/filter capacitors. The ADC channel has an independent input amplifier gain stage that can be programmed in steps of 3 dB, from 0 dB to 12 dB. The input amplifier gain settings are set by program- ming the appropriate bits in Control Register E. The ADC can also be muted under software control. The AD74111 input channel employs a multibit sigma-delta conversion technique that provides a high resolution output with system filtering imple- mented on-chip. Sigma-delta converters employ a technique known as oversampling, where the sampling rate is many times the highest frequency of interest. In the case of the AD74111, the oversampling ratio is 64 and a decimation filter is used to reduce the output to standard sample rates. The maximum sample rate is 48 kHz. DAC DATA 16-/20-/24- BITS 5 BITS /4 PRESCALERS (/1 to /12) - ADC MODULATOR SINC FILTER (/8) DECIMATOR (/8) MCLK ADC DATA 16-/20-/24- BITS ADC INPUT ADC MODULATOR CLOCK DAC O/P DAC MODULATOR CLOCK /2 - DAC MODULATOR INTERPOLATOR ( 16) INTERPOLATOR ( 8) Figure 4. ADC and DAC Engine SAMPLE RATE – kHz 54 84 48 16 24 40 58 62 66 70 74 78 32 TPC 7. ADC THD+N vs. Sample Rate SAMPLE RATE – kHz 78 848 16 24 40 80 82 84 86 88 90 32 TPC 8. DAC THD+N vs. Sample Rate |
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