AK5355 Ver la hoja de datos (PDF) - Asahi Kasei Microdevices

Número de pieza

componentes Descripción

Fabricante

AK5355

Low Power 16bit ∆ΣADC

Asahi Kasei Microdevices 

ASAHI KASEI

[AK5355]

„ MIC Device Connection Example

Figure 9 and Figure 10 show 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 4.4kΩ (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 9, 1st order LPF by 2.2kΩ 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

0.1µ

MIC

+

2.2µ

0.1µ

2.2k

2.2k

Analog Supply

2.1 ∼ 3.6V

Digital Supply

2.1 ∼ 3.6V

+

10µ

1 VCOM

2 RIN

TST1 16

NC 15

3 LIN

DIF 14

10µ +

4 VSS

0.1µ

5 VA

Top View PDN 13

BCLK 12

10µ + 0.1µ

6 VD

7 SEL

MCLK 11

LRCK 10

8 NC

SDTO 9

Mode

Setting

Reset

Controller

Analog Ground

System Ground

Figure 9. MIC Device Connection Example (AK5355VT)

MS0113-E-01

- 14 -

2005/01

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