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ADAU1373BCBZ-R7 Datasheet(PDF) 40 Page - Analog Devices |
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ADAU1373BCBZ-R7 Datasheet(HTML) 40 Page - Analog Devices |
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40 / 296 page  ADAU1373 Rev. 0 | Page 40 of 296 Microphone Bias The MICBIAS1 and MICBIAS2 pins (Ball C8 and Ball C9, respectively) provide a voltage reference for electret analog microphones. These pins are independent MICBIASx voltage outputs that can be set using Register 0x21 to Register 0x23 of the I2C control registers. The MICBIASx voltage can be set via Register 0x21. Four output voltage settings are available: 1.8 V, 2.2 V, 2.6 V, and 2.9 V. Current sense circuits can detect the current going out of the MICBIAS1 pin or MICBIAS2 pin. This current detect function can be used to sense the presence of the electret microphone. The internally generated current sense logic output can be used as an interrupt on any of the four GPIOs to communicate to the system controller. The current sense can be enabled or disabled using Register 0x22 for MICBIAS1 and Register 0x23 for MICBIAS2. Additional options include overcurrent protection, which can be used to sense the short circuit of MICBIAS1 or MICBIAS2 to ground at the microphone inputs. The overcurrent threshold is programmable, allowing for flexibility in system design. The MICBIASx pins can also be used to supply voltage to digital microphones or analog microphones with separate power supply pins. However, the maximum current that is available from the MICBIAS1 or MICBIAS2 pin is 1.8 mA. Microphone Input Connection To use the microphone input, first identify the type of microphone being used. The ADAU1373 provides microphone bias for condenser microphones. Set the bias voltage as required in the application. It is recommended that the bias be connected to the desired microphone input using a 2 kΩ resistor. If using a single-ended condenser microphone, see Figure 83 for the correct connection configuration. ADAU1373 AINxL/AINxP MICBIASx AINxR/AINxN LEFT MICROPHONE RIGHT MICROPHONE 2kΩ 2kΩ PGA MODE RIGHT PGA –12dB TO +18dB –12dB TO +18dB Figure 83. Condenser Microphone Input, Single-Ended If using a differential or balanced condenser microphone configuration, see Figure 84. ADAU1373 AINxL/AINxP MICBIASx AINxR/AINxP AINxL/AINxN LEFT MICROPHONE RIGHT MICROPHONE 2kΩ 2kΩ R1* PGA MODE PGA MODE –12dB TO +18dB –12dB TO +18dB AINxR/AINxN R2* *R1 AND R2 CAN BE 2k Ω FOR DIFFERENTIAL OR 0Ω FOR PSEUDO-DIFFERENTIAL INPUT. Figure 84. Condenser Microphone Input, Differential Line Input Connection To use the analog input as the line input, configure the input to either stereo (single-ended) or mono (differential), as desired (see Figure 85 or Figure 86, respectively). ADAU1373 LEFT LINE INPUT RIGHT LINE INPUT –12dB TO +18dB –12dB TO +18dB AINxL/AINxP AINxR/AINxN Figure 85. Single-Ended Line Input ADAU1373 +INPUT –INPUT –12dB TO +18dB AINxL/AINxP AINxR/AINxN Figure 86. Differential Line Input |
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