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AKD4635 Datasheet(PDF) 38 Page - Asahi Kasei Microsystems |
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AKD4635 Datasheet(HTML) 38 Page - Asahi Kasei Microsystems |
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38 / 81 page  [AK4635] Rev. 0.6 2007/10 - 38 - MICP pin MICNpin MPI pin AK4635 MIC-Amp 1k 1k HPF A/D MIC-Power BICK pin FCK pin STDO pin Audio I/F Figure 37. MIC Differential Input Circuit ■ MIC Gain Amplifier The AK4635 has a Gain Amplifier for Microphone input. These gains are selected by the MGAIN3-0 bit. The typical input impedance is 30k Ω. MGAIN3 bit MGAIN2 bit MGAIN1 bit MGAIN0 bit Input Gain 0 0 0 0 0dB 0 0 0 1 +20dB (default) 0 0 1 0 +26dB 0 0 1 1 +32dB 0 1 0 0 +10dB 0 1 0 1 +17dB 0 1 1 0 +23dB 0 1 1 1 +29dB 1 0 0 0 +3dB 1 0 0 1 +6dB Others N/A Table 20. Input Gain ■ MIC Power The MPI pin supplies power for the Microphone. This output voltage is proportional to 0.8 x AVDD typically and the load resistance is minimum 2k Ω. No capacitor must not be connected to the MPI pin, directly. (Figure 38) MIC pin MPI pin AK4635 MIC-Amp ≥ 2k HPF A/D MIC-Power BICK pin FCK pin STDO pin Audio I/F Figure 38. MIC Block Circuit |
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