MOSA

MS6821

4 Stereo inputs / 2W PA output integrated Audio DAC and Volume Control

REV 1.0

21

www.mosanalog.com

APPLICATION INFORMATION

A base application circuit

BCK

WS

DATA

SDA

SCL

2.4~5.5V

Power Amplifier Supply

1uF

1uF

0.1uF

MS6821

Audio

Decoder

MCU

2

28

1

27

28

21

8

19

13

16

10

4.7uF

CAP

2.4~5.5V

Supply

1uF

3

LIN1

LIN2

LIN3

25

24

23

LIN4

22

RIN1

RIN2

RIN3

4

5

6

RIN4

7

L channel

R channel

10uF

10uF

OUTL-

OUTL+

20

18

100uF

1k

R

L

8Ω

OUTR-

OUTR+

9

11

100uF

1k

R

L

8Ω

DACL

DACR

15

14

Headphone Jack

10uF

10uF

100k

V

DD

MCU

HP_sense

100k

1uF

Using LINE_IN function -- Built-in DAC power down

There are two functions at pin14 and pin15, one is built-in DAC output channel, and the other is LINE_IN.

The DAC must be power down if the two pins are operated in LINE_IN function.

RIN2

RIN1

Attenuation

&

Mute

LIN1

LIN2

LIN3

RIN3

LIN4

RIN4

16-bit DAC

Mixer

Attenuation

&

Mute

Mixer

LINE_INL

LINE_INR

Po

we

r D

ow

n

14

15

Audio signal

L-ch selector

& Gain

R-ch selector

& Gain