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XE3005I033 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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XE3005I033 Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 32 page Data Sheet XE3005/XE3006 9 D0212-116 2.1.9 Sandman™ DAC Function The Sandman™ function monitors the signals, which are processed in the ADC signal, channel and the DAC signal channel. The logic output signal SMDA indicates whether the DAC signal channel processes an audio signal or only noise, and this for certain duration. The reference signal amplitude can be selected through register P, the time window parameters are the off time and on time (registers L, M and N). Serial Audio Interface BCLK FSYNC SDI PWM DAC Power amplifier AOUTP AOUTN VDDPA VSSPA SMDA Sandman Interface Reg I, bit 4 Figure 8: Implementation of the Sandman function for the DAC (SMDA) The logic output SMDA can be employed to power-down other devices in the application, such as an external audio power amplifier. By setting bit 4 in register I, the on-chip DAC signal channel can be powered-down through SMDA too. The Sandman™ function is illustrated in Figure 9 and is valid for both SMAD (related to the ADC signal) and SMDA (related to the DAC signal). off-time on-time AIN/SDO (AOUT/SDI) SMAD (SMDA) On-time counter Off-time counter + reference - reference Time step = 1/fs = 1/FSYNC 12 9 38 7 6 45 10 time Figure 9: Illustration of the Sandman™ function. The above illustration is valid for either the SMAD output as a result of AIN/SDO or for the SMDA output as a function of AOUT/SDI. |
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