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ADAU1772BCPZ-R7 数据表(PDF) 47 Page - Analog Devices |
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ADAU1772BCPZ-R7 数据表(HTML) 47 Page - Analog Devices |
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47 / 117 page  ADAU1772 Data Sheet Rev. C | Page 46 of 116 DSP BYPASS MODE When DSP bypass mode is enabled, a direct path from the ADC outputs to the DACs is set up to enable bypassing the core pro- cessing to listen to environmental sounds. This is useful for listening to someone speaking without having to remove the noise cancelling headphones. The DSP bypass path is enabled by setting an MPx pin low. Figure 92 shows the DSP bypass path disabled, and Figure 93 shows the DSP bypass path enabled by pressing the push-button switch. The DSP bypass feature works for both analog and digital microphone inputs. DSP bypass is enabled when a switch connected to an MPx pin that is set to DSP bypass mode is closed and the MPx pin signal is pulled low. Pressing and holding the switch closed enables the DSP bypass signal path as defined in the TALKTHRU register (Address 0x002A). The DAC volume control setting is switched from the default gain setting to the new TALKTHRU_GAINx register setting (Address 0x002B and Address 0x002C). DSP bypass is enabled only on ADC0 and ADC1. The DSP bypass signal path is from the output of ADCx to the input of the DAC(s). When DSP bypass is enabled, the current DAC volume setting is ramped down to −95.625 dB and the DSP bypass volume setting is ramped up to avoid pops when switching paths. Figure 92. DSP Bypass Path Disabled Figure 93. DSP Bypass Path Enabled ADAU1772 PGA AND ADC DAC AND HP AMPLIFIER NORMAL SETTING HPOUTxP HPOUTxN CORE PROCESSING 10kΩ MPx AINxREF AINx ADAU1772 PGA AND ADC DAC AND HP AMPLIFIER TALK-THRU SETTING HPOUTxP HPOUTxN CORE PROCESSING 10kΩ MPx AINxREF AINx |
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