MOSA
MS6720
3 Stereo Inputs / 4-Channel Outputs Audio Processor
3 Stereo Inputs and 4-Channel Outputs
Volume, Balance, Fader and Selectable Input
Gain
FEATURES
•Operation
range : 2.7V~5V
•3
stereo inputs with selectable input gain
•4
independent speaker controls for fader and balance
•Independent
mute function
•Volume
control in 1.25 dB/step
•I
2
C interface
•Components
less and good PSRR
•Housed
in SOP20, SSOP20 packages
APPLICATIONS
•Portable
audio device
•Car
stereo audio
•Hi-Fi
audio system
•Cross-reference:
PT2313L-20
DESCRIPTION
The MS6720 is a 3 stereo inputs/4-channel outputs digital control audio processor for the low voltage operation.
Volume, balance (left/right), and fader (front/rear) processor are incorporated into a single chip. The MS6720 also has
selectable input gain. All functions are programmable via the serial I
2
C bus. The default states of the chip as the power
is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage are
0dB. The stereo 4 is connected internally, but not available on pins.
BLOCK DIAGRAM
LOUT
13
LIN
12
Speaker
ATT
17
OUT_LF
Mute
LIN1
LIN2
LIN3
11
10
9
Volume
Input
Selector
&Gain
Control
Speaker
ATT
15
Mute
OUT_LR
20
Serial Bus Decoder and Latches
SCL
19
SDA
18
DGND
Speaker
ATT
RIN3
RIN2
RIN1
6
7
8
Volume
16
OUT_RF
Mute
Speaker
ATT
Supply
2
3
1
5
4
RIN
14
OUT_RR
Mute
AVDD AGND REF ROUT
REV1.0
1
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MOSA [ MOSA ELECTRONICS ]
