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AK5355 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems |
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AK5355 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems |
11 / 14 page ASAHI KASEI [AK5355] MS0113-E-00 2001/08 - 11 - MIC Device Connection Example Figure 8 shows the connection example of MIC Device. In this case, a mono microphone is connected to LIN pin the AK5355. Unused RIN pin can be open. The power supply for the microphone is provided via 4.4k Ω (2.2kΩ + 2.2kΩ) from analog power supply. The power supply noise provided to the microphone should be care because the microphone gain is usually high, around 40dB. In Figure 8, 1 st order LPF by 2.2k Ω and 10µF is inserted between the power supply and the microphone. The AK5355 has a gain of +15dB in analog stage. However, as the usual application needs a gain of around 40dB or 50dB, the shortage of gain, 25dB or 35dB, should be covered by digital processing like DSP. The total S/N in each gain level is shown in Table 3 Analog Gain Digital Gain S/N +15dB 0dB 83dB +15dB +25dB 58dB +15dB +35dB 48dB Table 3. S/N of each gain level VCOM 1 RIN 2 LIN 3 VSS 4 VA 5 VD 6 SEL 7 NC 8 16 15 14 13 12 11 10 9 TST1 NC PDN BCLK MCLK LRCK SDTO Top View 0.1 µ Analog Supply 10 µ + Controller System Ground Analog Ground DIF Reset + 0.1 µ 2.2 µ Mode Setting 2.1 ∼ 3.6V 0.1 µ 10 µ + Digital Supply 2.1 ∼ 3.6V MIC 10 µ + 2.2k 2.2k 0.1 µ Figure 8. MIC Device Connection Example |
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