MOSA
MS6821
4 Stereo inputs / 2W PA output integrated Audio DAC and Volume Control
4 Stereo Inputs, 2W BTL Stereo Output
16-bit Stereo DAC and Volume Control
FEATURES
•Operation
range: 2.4V~5.5V
•Volume
control range
Gain: 0 to 21dB, 3dB/step
Attenuation: 0 to –77.5dB, 1.25dB/step
•4
stereo inputs (mixed with an audio DAC)
•Output
mode : Speaker( BTL)/Headphone(SE)
•BTL
Output power, THD+N=1%, Stereo Input
R
L
=4 , 2W at 5V, 0.8W at 3.3V, 360mW at 2.4V
R
L
=8 , 1.3W at 5V, 0.53W at 3.3V, 250mW at 2.4V
•BTL
Output power, DAC Input
R
L
=4 , 1.6W at 5V, 0.70W at 3.3V, 340mW at 2.4V
R
L
=8 , 0.83W at 5V, 0.35W at 3.3V, 170mW at 2.4V
•Built-in
16-bit Audio DAC
•Audio
format : I
2
S, Right justified, Left justified
•Control
interface : I
2
C
•Excellent
Power Supply Rejection Ratio(PSRR)
•Flexibility
power management
•Component
less
•Reduce
pop noise circuit
•Housed
in TSSOP28 package, enhanced thermal
PAD
APPLICATIONS
Multimedia system, Portable Digital Audio.
DESCRIPTION
The MS6821 is a 16-bits voltage-output Digital-to-Analog Converter (DAC) integrated class AB stereo headphone
driver and stereo speaker power amplifier. It can drive 2W of continuous average power into a dual 4 bridged-tied
(BTL) speaker or 2 * 90mW into stereo 32 single ended (SE) headphone. The 16-bit DAC supports general and
popular formats as I2S, Right justified. The volume control offers wide range of gain and attenuation for 4-set stereo
input. All of the functions are set by I2C interface.
The MS6821 has good feature for portable equipment, including wide voltage operation 2.4V~5.5V, low power
consumption, flexible power management, component less and small package TSSOP28, make the MS6821 ideally
suitable for use in the portable digital audio equipments.
BLOCK DIAGRAM
LIN1
LIN2
LIN3
LIN4
Attenuation
&
Mute
Mixer
-1
OUTR-
L-ch selector
& Gain
-1
RIN4
RIN3
RIN2
RIN1
R-ch selector
& Gain
Attenuation
&
Mute
OUTR+
Mixer
-1
OUTL-
BCK
WS
DATA
16-bit DAC
-1
OUTL+
Supply
I
2
C
Interface
Power Amplifier
Supply
VDD
Vss
CAP
DACL /
DACR /
LINE_INL LINE_INR
SCL SDA
PV
DDL
PV
SSL
PV
DDR
PV
SSR
REV 1.0
1
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