Delta MS210 User Manual download pdf (Page 21)

MS210

MS210 DS004 www.mshinetek.com

- 21 -

The above information is the exclusive intellectual property of M-Shine Technologies Corporation and shall not be disclosed, distributed without permission

rom M-

hine.

)()(

)()()(

tNtN

tNtNVADC

•

⎟

⎠

⎞

⎜

⎝

⎛

•−

′

≅

•

⎟

⎠

⎞

⎜

⎝

⎛

⎟

⎠

⎞

⎜

⎝

⎛

•−

′

•−•

⎟

⎠

⎞

⎜

⎝

⎛

•−

′

Eq. 2

Since R3/R2 is large, and R2/R3 is very small. We can consider only the large part. From Eq. 2, we know if

VADC will be almost zero if the following condition is true.

tNtN

)()(

•≅

′

Eq. 3

That is, if the microphone’s impedance is “almost” resistive, we can assume that if DC of VMIC is equal to

DC of VAG, the noise can be cancelled mostly. Because VMIC has noise from AVDD (MBIAS) around

N(t)*RMIC/(R1+RMIC). If that value is equal to VMIC, the DC values of them are almost the same.

Above theory applies when the noise on AVDD/AVSS is small and has very quiet and has few harmonic

power.

For NO-MIC recording applications, no power noise will be generated theoretically.

Playing Function Description

MS210 can play the recorded sound from the SPI Flash memory. The following subsections will describe the

playing function in detail.

Playing Timing Diagram, 1-SEG Mode (SEG2 pin floating)

When PLAE or PLAL pressed, MS210 will start to play. The LED and sound segment timing is as the

following figure, when SEG2 pin is floating.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 34 35

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Delta MS210 User Manual Page 21

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