MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Gain and Attenuation Volume Controller IC
One Set of Stereo Input, Low voltage
Gain and Attenuation 15~-79dB
FEATURES
‧Operation
range: 2.7V~5.5V
‧Low
power consumption
‧Gain/Attenuation:
15dB to –79dB at 1dB/step
‧Housed
in 8 pin SOP package
‧I
2
C interface
APPLICATIONS
‧Multimedia
system
‧Hi-Fi
audio system
‧MP3,
PDA
‧Cross-reference
PT2257, PT2259
DESCRIPTION
The MS6257 is the stereo audio volume controller IC. It uses CMOS technology specially for the low voltage
application with low noise, rail-to-rail output. The MS6257 provide an I
2
C control interface with gain / attenuation
range of 15dB to –79dB, 1dB/step. The initial condition is set to be maximum attenuation –79dB and mute on mode
when the power is up.
PIN CONFIGURATION
Symbol
L-IN
L-OUT
V
SS
SDA
SCL
V
DD
R-OUT
R-IN
Pin
1
2
3
4
5
6
7
8
Description
Left channel input
Left channel output
Ground
I C data input
I
2
C clock input
Positive supply voltage
Right channel output
Right channel input
2
L-IN
1
L-OUT
2
V
SS
3
SDA
4
8
R-IN
MS6257
7
R-OUT
6
V
DD
5
SCL
BLOCK DIAGRAM
L-IN
1dB/STEP
-1dB/STEP
-10dB/STEP
L-OUT
Serial Bus Decoder and Latches
R-IN
1dB/STEP
-1dB/STEP
-10dB/STEP
REF
R-OUT
I2C Interface
Reference
Circuit
SDA
REV 1
SCL
1
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MOSA
ORDERING INFORMATION
Package
8-Pin SOP
8-Pin SOP
8-Pin SOP (lead free)
8-Pin SOP (lead free)
Part number
MS6257TR
MS6257U
MS6257GTR
MS6257GU
MS6257
MS6257
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Packaging Marking
Transport Media
2.5k Units Tape and Reel
100 Units Tube
2.5k Units Tape and Reel
100 Units Tube
MS6257G
MS6257G
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
ESD
T
STG
T
A
T
J
T
S
R
THJA
Supply Voltage
Electrostatic Handling
Storage Temperature Range
Operating Ambient Temperature Range
Maximum Junction Temperature
Soldering Temperature, 10 seconds
Thermal Resistance from Junction to Ambient in Free Air
SOP8
Parameter
Rating
6
-4500 to 4500
-65 to 150
-40 to 85
150
260
210
Unit
V
V
℃
℃
℃
℃
℃/W
OPERATING RATINGS
Symbol
V
DD
Supply Voltage
Parameter
Min
2.7
Typ
-
Max
5.5
Unit
V
REV 1
2
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MOSA
5V ELECTRICAL CHARACTERISTICS
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
(V
DD
=5.0V, V
SS
=0V, Attenuation=0dB, Gain=0dB, f=1KHz, V
O
=0dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
DC Characteristics
I
Q
A
GA
A
STEP
E
GA
E
IGA
CS
MUTE
Rin
Rout
Vo
THD+N
S/N
V
IH
V
IL
Quiescent current
Gain/Attenuation
Gain/Attenuation step
Gain/Attenuation step error
Interchannel gin/attenuation error
Channel separation
Mute Attenuation
Input Impedance
Output Impedance
Maximum output voltage swing
Total harmonic distortion plus
noise
Signal-to-noise ratio
Bus high input level
Bus low input level
V
O
=4.5Vpp
(THD+N)/S < 0.1%
Vin=0dBV
Max gain
Max attenuation
-
-
-
-
-
-
120
-
18
-
-
-
95
-
0.3V
DD
3.1
15
-79
1
0.3
0.3
130
85
20
50
4.8
-68
100
-
-
3.5
-
-
-
-
-
-
-
-
100
-
-63
-
0.7V
DD
-
Unit
mA
dB
dB
dB
dB
dB
dB
dB
kΩ
Ω
Vpp
dB
dB
V
V
AC Characteristics
Bus Characteristics
3.3V ELECTRICAL CHARACTERISTICS
(V
DD
=3.3V, V
SS
=0V, Attenuation=0dB, Gain=0dB, f=1KHz, V
O
=-3dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
DC Characteristics
I
Q
CS
MUTE
Vo
THD+N
S/N
Quiescent current
Channel separation
Mute Attenuation
Maximum output voltage swing
Total harmonic distortion plus
noise
Signal-to-noise ratio
Vin=-3dBV
(THD+N)/S < 0.1%
-
90
-
-
-
85
2.8
110
80
3
-63
90
3.3
-
-
-
-58
-
mA
dB
dB
Vpp
dB
dB
Unit
AC Characteristics
REV 1
3
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MOSA
2.7V ELECTRICAL CHARACTERISTICS
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
(V
DD
=2.7V, V
SS
=0V, Attenuation=0dB, Gain=0dB, f=1KHz, V
O
=-3dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
DC Characteristics
I
Q
CS
MUTE
Vo
THD+N
S/N
Quiescent current
Channel separation
Mute Attenuation
Maximum output voltage swing
Total harmonic distortion plus
noise
Signal-to-noise ratio
Vin=-3dBV
(THD+N)/S < 0.3%
-
95
-
-
-
85
2.5
105
80
2
-60
90
2.9
-
-
-
-55
-
Unit
mA
dB
dB
Vpp
dB
dB
AC Characteristics
TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25℃, R
L
=32
Ω
; unless otherwise specified)
f=20Hz
f=20Hz
f=20Hz
THD+N (%)
THD+N (%)
f=1kHz
f=1kHz
f=20kHz
f=20kHz
THD+N (%)
f=1kHz
f=20kHz
V
DD
=5V
V
DD
=3.3V
V
DD
=2.7V
OUTPUT VOLTAGE (dBV)
OUTPUT VOLTAGE (dBV)
OUTPUT VOLTAGE (dBV)
THD+N vs. output voltage
THD+N vs. output voltage
THD+N vs. output voltage
CHANNEL SEPARATION (dB)
V
DD
=3.3V
V
O
=-3dBV
V
DD
=2.7V
V
O
=-3dBV
V
DD
=2.7V
V
O
=-3dBV
V
DD
=3.3V
V
O
=-3dBV
V
DD
=5V
V
O
=0dBV
V
DD
=5V
V
O
=0dBV
FREQUENCY (Hz)
FREQUENCY (Hz)
QUIESCENT CURRENT (mA)
THD+N (%)
SUPPLY VOLTAGE (V)
THD+N vs. frequency
Channel separation vs. frequency
Quiescent current vs. supply voltage
REV 1
4
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MOSA
I
2
C BUS DESCRIPTION
Start and stop conditions
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
A start condition is activated when the SCL is set to HIGH and SDA shifts from HIGH to LOW state. The stop
condition is activated when SCL is set to HIGH and SDA shifts from LOW to HIGH state. Please refer to the timing
diagram below.
SCL
SDA
Start
Stop
SCL : Serial Clock Line, SDA : Serial Data Line
Data validity
A data on the SDA line is considered valid and stable only when the SCL signal is in HIGH state. The HIGH and
LOW states of the SDA line can only change when the SCL signal is LOW. Please refer to the figure below.
SDA
SCL
Data line
stable,
Data valid
Data
change
allowed
Byte format
Every byte transmitted to the SDA line consists of 8 bits. Each byte must be followed by an acknowledge bit.
The MSB is transmitted first.
Acknowledge
During the Acknowledge clock pulse, the master (up) put a resistive HIGH level on the SDA line. The peripheral
(audio processor) that acknowledges has to pull-down (LOW) the SDA line during the Acknowledge clock pulse so that
the SDA line is in a stable LOW state during this clock pulse. Please refer to the diagram below.
SCL
1
2
3
7
8
9
SDA
MSB
Start
Acknowledge
The audio processor that has been addressed has to generate an Acknowledge after receiving each byte, otherwise,
the SDA line will remain at the HIGH level during the ninth (9
th
) clock pulse. In this case, the master transmitter can
generate the STOP information in order to abort the transfer.
REV 1
5
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