ETC MS6257TR

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
APPLICATIONS
‧Operation range: 2.7V~5.5V
‧Low power consumption
‧Gain/Attenuation: 15dB to –79dB at 1dB/step
‧Housed in 8 pin SOP package
‧I2C interface
‧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 I2C 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
Pin
Description
L-IN
1
Left channel input
L-OUT
2
Left channel output
VSS
3
Ground
SDA
4
I2C data input
SCL
5
I2C clock input
VDD
6
Positive supply voltage
R-OUT
7
Right channel output
R-IN
8
Right channel input
L-IN 1
L-OUT 2
VSS 3
8 R-IN
7 R-OUT
MS6257
6 VDD
SDA 4
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
R-OUT
REF
Reference
Circuit
I2C Interface
SDA
REV 1
SCL
1
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
ORDERING INFORMATION
Package
Part number
Packaging Marking
Transport Media
8-Pin SOP
MS6257TR
MS6257
2.5k Units Tape and Reel
8-Pin SOP
MS6257U
MS6257
100 Units Tube
8-Pin SOP (lead free)
MS6257GTR
MS6257G
2.5k Units Tape and Reel
8-Pin SOP (lead free)
MS6257GU
MS6257G
100 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Rating
Unit
6
V
-4500 to 4500
VDD
Supply Voltage
VESD
Electrostatic Handling
TSTG
Storage Temperature Range
-65 to 150
V
℃
TA
Operating Ambient Temperature Range
-40 to 85
℃
TJ
Maximum Junction Temperature
150
℃
TS
Soldering Temperature, 10 seconds
260
℃
RTHJA
Thermal Resistance from Junction to Ambient in Free Air
SOP8
210
℃/W
OPERATING RATINGS
Symbol
VDD
REV 1
Parameter
Supply Voltage
2
Min
Typ
Max
Unit
2.7
-
5.5
V
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
5V ELECTRICAL CHARACTERISTICS
(VDD=5.0V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1KHz, VO=0dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
DC Characteristics
IQ
Quiescent current
-
3.1
3.5
mA
AGA
Gain/Attenuation
Max gain
-
15
-
dB
Max attenuation
-
-79
-
dB
ASTEP
Gain/Attenuation step
-
1
-
dB
EGA
Gain/Attenuation step error
-
0.3
-
dB
EIGA
Interchannel gin/attenuation error
-
0.3
-
dB
CS
Channel separation
120
130
-
dB
MUTE
Mute Attenuation
-
85
-
Rin
Input Impedance
18
20
-
dB
kΩ
Rout
Output Impedance
-
50
100
Ω
-
4.8
-
Vpp
-
-68
-63
dB
95
100
-
dB
Vin=0dBV
AC Characteristics
Vo
Maximum output voltage swing
THD+N
Total harmonic distortion plus
noise
S/N
Signal-to-noise ratio
(THD+N)/S < 0.1%
VO=4.5Vpp
Bus Characteristics
VIH
Bus high input level
-
-
0.7VDD
V
VIL
Bus low input level
0.3VDD
-
-
V
3.3V ELECTRICAL CHARACTERISTICS
(VDD=3.3V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1KHz, VO=-3dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
DC Characteristics
IQ
Quiescent current
CS
Channel separation
MUTE
Mute Attenuation
-
2.8
3.3
mA
90
110
-
dB
Vin=-3dBV
-
80
-
dB
(THD+N)/S < 0.1%
-
3
-
Vpp
-
-63
-58
dB
85
90
-
dB
AC Characteristics
Vo
Maximum output voltage swing
THD+N
Total harmonic distortion plus
noise
S/N
Signal-to-noise ratio
REV 1
3
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
2.7V ELECTRICAL CHARACTERISTICS
(VDD=2.7V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1KHz, VO=-3dBV; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
DC Characteristics
IQ
Quiescent current
CS
Channel separation
MUTE
Mute Attenuation
-
2.5
2.9
mA
95
105
-
dB
Vin=-3dBV
-
80
-
dB
(THD+N)/S < 0.3%
-
2
-
Vpp
-
-60
-55
dB
85
90
-
dB
AC Characteristics
Vo
Maximum output voltage swing
THD+N
Total harmonic distortion plus
noise
S/N
Signal-to-noise ratio
TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25℃, RL=32Ω; unless otherwise specified)
THD+N (%)
f=20Hz
THD+N (%)
f=20Hz
THD+N (%)
f=20Hz
f=20kHz
f=1kHz
f=1kHz
VDD=5V
VDD=3.3V
VDD=2.7V
OUTPUT VOLTAGE (dBV)
OUTPUT VOLTAGE (dBV)
THD+N vs. output voltage
THD+N vs. output voltage
VDD=2.7V
VO=-3dBV
VDD=5V
VO=0dBV
VDD=2.7V
VO=-3dBV
VDD=3.3V
VO=-3dBV
VDD=5V
VO=0dBV
QUIESCENT CURRENT (mA)
OUTPUT VOLTAGE (dBV)
CHANNEL SEPARATION (dB)
THD+N (%)
f=20kHz
THD+N vs. output voltage
VDD=3.3V
VO=-3dBV
REV 1
f=1kHz
f=20kHz
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
THD+N vs. frequency
Channel separation vs. frequency
Quiescent current vs. supply voltage
4
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
I2C BUS DESCRIPTION
Start and stop conditions
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
Acknowledge
Start
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 (9th) 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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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Timing of SDA and SCL bus lines
SDA
tf
tLOW
SCL
S
tHD;STA
tSU;DAT
tr
tHD;DAT
Standard mode
Symbol
fSCL
tHD;STA
tf
tHIGH
tSU;STA
Parameter
Sr
tSP
tBUF
tr
tSU;STO
P
S
Min
Max
Unit
0
100
kHz
4.0
-
us
tLOW
SCL clock frequency
Hold time (repeated) START condition.
After this period, the first clock pulse is generated
LOW period of the SCL clock
4.7
-
us
tHIGH
HIGH period of the SCL clock
4.0
-
us
tSU:STA
4.7
-
us
0
3.45
us
tSU:DAT
Set-up time for a repeated START condition
Data hold time:
For I2C-bus devices
Data-set-up time
250
-
ns
tr
Rise time of both SDA and SCL signals
-
1000
ns
tf
Fall time of both SDA and SCL signals
-
300
ns
tSU:STO
Set-up time for STOP condition
4.0
-
us
tBUF
Bus free time between a STOP and START condition
4.7
-
us
Cb
Capacitive load for each bus line
-
400
pF
VnL
Noise margin at the LOW level for each connected device (including
0.1VDD
hysteresis)
-
V
VnH
Noise margin at the HIGH level for each connected device (including
0.2VDD
hysteresis)
-
V
tHD:STA
tHD:DAT
REV 1
6
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
BUS INTERFACE
Data are transmitted to and from the MCU to the MS6257 via the SDA and SCL. The SDA and SCL make up the
BUS interface. It should be noted that pull-up resistors must be connected to the positive supply voltage.
VDD
Rp
Rp
Pull up resistors
SDA (Serial Data Line)
SCL (Serial Clock Line)
MCU
MS6257
Interface protocol
The format consists of the following
‧A START condition
‧A chip address byte including the MS6257 address. (7bits)
‧The 8th bit of the byte must be “0”.(write=0, read=1)
‧MS6257 must always acknowledge the end of each transmitted byte.
‧A data sequence (N-bytes + Acknowledge)
‧A STOP condition
SDA
SCL
1-7
8
ADDRESS
R / -W
9
1-7
8
9
1-7
8
9
S
START
CONDITION
P
ACK
DATA
ACK
DATA
ACK
STOP
CONDITION
Protocol Address
1
0
0
0
1
0
7 bits address
0
0
W
MS6257 address
REV 1
7
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Data bytes description
Function bits
MSB
LSB
1
1
1
1
1
1
1
1
1
1
0
1
A3
A2
A1
A0
Function description
Function OFF (-79dB)
2-channel, -1dB/step
1
1
1
0
0
B2
B1
B0
2-channel, -10dB/step
1
0
1
0
A3
A2
A1
A0
Left channel, -1dB/step
1
0
1
1
0
B2
B1
B0
Left channel, -10dB/step
0
0
1
0
A3
A2
A1
A0
Right channel, -1dB/step
0
0
1
1
0
B2
B1
B0
Right channel, -10dB/step
1
1
0
0
C3
C2
C1
C0
2-channel, +1dB/step
0
1
1
0
C3
C2
C1
C0
Left channel, +1dB/step
0
1
0
1
C3
C2
C1
C0
Right channel, +1dB/step
0
1
1
1
1
0
0
M
2-channel, MUTE
When M=1, MUTE=ON
When M=0, MUTE=OFF
Gain / Attenuation bits
A3
A2
A1
A0
-
B2
B1
B0
C3
C2
C1
C0
Gain / Attenuation value (dB)
A
B
C
0
0
0
0
0
0
0
0
0
0
1
-1
-10
+1
0
0
1
0
-2
-20
+2
0
0
1
1
-3
-30
+3
0
1
0
0
-4
-40
+4
0
1
0
1
-5
-50
+5
0
1
1
0
-6
-60
+6
0
1
1
1
-7
-70
+7
1
0
0
0
-8
-
+8
1
0
0
1
-9
-
+9
1
0
1
0
-
-
+10
1
0
1
1
-
-
+11
1
1
0
0
-
-
+12
1
1
0
1
-
-
+13
1
1
1
0
-
-
+14
1
1
1
1
-
-
+15
1. Where Ax=-1dB/step, Bx=-10dB/step, Cx=+1dB/step
REV 1
8
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Example
Mute off
MSB
Start
1
Data byte
LSB
0
0
0
1
0
0
0
ACK
0
1
1
MS6257 address
1
1
0
0
0
Stop
2-ch, Mute off
The initial condition is –79dB and mute on when power up. The first command must disable the mute function.
Set gain of 2 channel at 0dB
Start
MS6257 Address
ACK
1
1
1
0
0
0
0
0
ACK
1
2-ch, -10dB/step, 0dB
1
1
0
0
0
0
0
0
ACK
1
0
1
0
0
0
0
ACK
0
ACK
0
ACK
1
ACK
2-ch, -1dB/step, 0dB
Stop
2-ch, +1dB/step, 0dB
Set gain of 2 channel at 6dB
The value of attenuation must be set zero when the volume from attenuation to gain.
Start
MS6257 Address
ACK
1
1
1
0
0
0
0
0
ACK
1
2-ch, -10dB/step, 0dB
1
1
0
0
0
1
1
0
ACK
1
0
1
0
0
0
2-ch, -1dB/step, 0dB
Stop
2-ch, +1dB/step, 6dB
Set gain of 2 channel at -3dB
The value of gain must be set zero when the volume from gain to attenuation.
Start
MS6257 Address
ACK
1
1
0
0
0
0
0
0
ACK
1
2-ch, +1dB/step, 0dB
1
1
0
1
0
0
1
1
ACK
1
1
0
0
0
0
2-ch, -10dB/step, 0dB
Stop
2-ch, -1dB/step, -3dB
Set attenuation of left channel at –33dB
Start
MS6257 Address
ACK
1
0
1
1
0
0
1
1
L-ch, -10dB/step, -30dB
REV 1
9
ACK
1
0
1
0
0
0
1
Stop
L-ch, -1dB/step, -3dB
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
APPLICATION INFORMATION
Basic application example
MS6257
4
SDA
VDD
6
5
SCL
VSS
3
1
L-IN
L-OUT
2
MCU
Supply
2.7~5V
0.1uF
10uF
47uF
10uF
10k
Signal
10uF
8
R-OUT
R-IN
7
10uF
Power
Amplifier
10k
Basic application flow chart
Procedure Of Power Up
Procedure Of Power
Shut Down
Power up
VDD = 5V
Volume Control
volume down to -79 dB
step by step
Initial Conditions
function off (-79dB)
mute on
Enable Mute Function
mute on
Disable Mute Function
mute off
Power down
VDD = 0V
Volume Control
volume up/down
step by step
1. The initial condition is –79dB and mute on when power up.
REV 1
10
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MOSA
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
EXTERNAL DIMENSIONS
SOP8 package
8
5
Symbol
H
E
1
A
A1
B
C
D
H
E
e
L
4
D
Dimension in mm
Min
Max
1.35
1.75
0.10
0.25
0.33
0.51
0.19
0.25
4.80
5.00
5.80
6.20
3.80
4.00
1.27 BSC
0.40
1.27
Dimension in inch
Min
Max
0.0532 0.0688
0.0040 0.0098
0.013
0.020
0.0075 0.0098
0.1890 0.1968
0.2284 0.2440
0.1497 0.1574
0.050 BSC
0.016
0.050
L
A
A1
e
B
C
TAPE AND REEL (Unit : mm)
2.0
0.30
0.05
0.05
1.5+0.1/-0.0 DIA
4.0
1.75
0.3R MAX
5.5
0.05
12.0 0.3
5.4
3.0
3.6
8.0
1.5 MIN
6.9
0.5 Radius Typical
2.0 1.7
REV 1
11
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