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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 I2C 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 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 L-IN L-OUT VSS SDA SCL VDD R-OUT R-IN Pin 1 2 3 4 5 6 7 8 Description Left channel input Left channel output Ground I2C data input I2C clock input Positive supply voltage Right channel output Right channel input
L-IN 1 L-OUT 2 VSS 3 SDA 4 8 R-IN
MS6257
7 R-OUT 6 VDD 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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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 VDD VESD TSTG TA TJ TS RTHJA 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 /W Unit V V
OPERATING RATINGS
Symbol VDD Supply Voltage Parameter Min 2.7 Typ Max 5.5 Unit V
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5V ELECTRICAL CHARACTERISTICS
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
(VDD=5.0V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1KHz, VO=0dBV; unless otherwise specified) Symbol Parameter Conditions Min Typ Max DC Characteristics IQ AGA ASTEP EGA EIGA CS MUTE Rin Rout Vo THD+N S/N VIH VIL 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 VO=4.5Vpp (THD+N)/S < 0.1% Vin=0dBV Max gain Max attenuation 120 18 95 0.3VDD 3.1 15 -79 1 0.3 0.3 130 85 20 50 4.8 -68 100 3.5 100 -63 0.7VDD -
Unit mA dB dB dB dB dB dB dB k
AC Characteristics Vpp dB dB V V
Bus Characteristics
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 DC Characteristics IQ 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
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2.7V ELECTRICAL CHARACTERISTICS
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
(VDD=2.7V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1KHz, VO=-3dBV; unless otherwise specified) Symbol Parameter Conditions Min Typ Max DC Characteristics IQ 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 , RL=32; 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
VDD=5V
VDD=3.3V
VDD=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)
VDD=3.3V VO=-3dBV
VDD=2.7V VO=-3dBV
VDD=2.7V VO=-3dBV
VDD=3.3V VO=-3dBV
VDD=5V VO=0dBV
VDD=5V VO=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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I2C 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 (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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Timing of SDA and SCL bus lines
SDA tf SCL
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
tLOW
tr
tSU;DAT
tf
tHD;STA
tSP
tr
tBUF
S
tHD;STA
tHD;DAT
tHIGH
tSU;STA
Sr
tSU;STO
P
S
Standard mode Symbol fSCL tHD:STA tLOW tHIGH tSU:STA tHD:DAT tSU:DAT tr tf tSU:STO tBUF Cb VnL VnH
Parameter
Min 0 4.0 4.7 4.0 4.7 0 250 4.0 4.7 -
Max 100 3.45 1000 300 400 -
Unit kHz us us us us us ns ns ns us us pF V V
SCL clock frequency Hold time (repeated) START condition. After this period, the first clock pulse is generated LOW period of the SCL clock HIGH period of the SCL clock Set-up time for a repeated START condition Data hold time: For I2C-bus devices Data-set-up time Rise time of both SDA and SCL signals Fall time of both SDA and SCL signals Set-up time for STOP condition Bus free time between a STOP and START condition Capacitive load for each bus line
Noise margin at the LOW level for each connected device (including 0.1VDD hysteresis) Noise margin at the HIGH level for each connected device (including 0.2VDD hysteresis)
REV 1
6
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BUS INTERFACE
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
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
9
1-7
8
9
1-7
8
9
S START CONDITION ADDRESS R / -W ACK DATA ACK DATA ACK
P STOP CONDITION
Protocol Address
1 0 0 0 1 0 0 0 W
7 bits address MS6257 address
REV 1
7
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Data bytes description Function bits MSB 1 1 1 1 1 0 0 1 0 0 0 1 1 1 0 0 0 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 0 0 1 0 1 0 0 1 1 1 A3 0 A3 0 A3 0 C3 C3 C3 1 1 A2 B2 A2 B2 A2 B2 C2 C2 C2 0 1 A1 B1 A1 B1 A1 B1 C1 C1 C1 0 LSB 1 A0 B0 A0 B0 A0 B0 C0 C0 C0 M
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
Function description Function OFF (-79dB) 2-channel, -1dB/step 2-channel, -10dB/step Left channel, -1dB/step Left channel, -10dB/step Right channel, -1dB/step Right channel, -10dB/step 2-channel, +1dB/step Left channel, +1dB/step Right channel, +1dB/step 2-channel, MUTE When M=1, MUTE=ON When M=0, MUTE=OFF
Gain / Attenuation bits A3 C3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A2 B2 C2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A1 B1 C1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A0 B0 C0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 A 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 Gain / Attenuation value (dB) B 0 -10 -20 -30 -40 -50 -60 -70 C 0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12 +13 +14 +15
1. Where Ax=-1dB/step, Bx=-10dB/step, Cx=+1dB/step
REV 1
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Example Mute off
MSB Start 1 0 0 0 1 0 0 LSB 0 ACK 0 1 1 Data byte 1 1 0
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
0
0
Stop
MS6257 address
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 1 0 1 0 0 0 0 ACK
2-ch, -10dB/step, 0dB 1 1 0 0 0 0 0 0 ACK Stop
2-ch, -1dB/step, 0dB
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 1 0 1 0 0 0 0 ACK
2-ch, -10dB/step, 0dB 1 1 0 0 0 1 1 0 ACK Stop
2-ch, -1dB/step, 0dB
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 1 1 0 0 0 0 0 ACK
2-ch, +1dB/step, 0dB 1 1 0 1 0 0 1 1 ACK Stop
2-ch, -10dB/step, 0dB
2-ch, -1dB/step, -3dB
Set attenuation of left channel at -33dB
Start MS6257 Address ACK 1 0 1 1 0 0 1 1 ACK 1 0 1 0 0 0 1 1 ACK Stop
L-ch, -10dB/step, -30dB
L-ch, -1dB/step, -3dB
REV 1
9
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APPLICATION INFORMATION
Basic application example
MS6257 4 MCU 5 SCL
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
SDA
VDD
6 0.1uF 47uF
Supply 2.7~5V
VSS
3
10uF
10uF 1 L-IN L-OUT 2 10k Power Amplifier
Signal 10uF 8 R-IN R-OUT 7 10uF
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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EXTERNAL DIMENSIONS
SOP8 package
MS6257
GAIN AND ATTENUATION VOLUME CONTROLLER IC
8
5
Symbol 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
H
E 1 4
D
A A1 B C D H E e L
L A A1 e B C
TAPE AND REEL (Unit : mm)
2.0 0.30 0.05 4.0 1.75 0.3R MAX 5.5 0.05 12.0 0.3
5.4
0.05
1.5+0.1/-0.0 DIA
3.0 3.6 6.9
8.0 1.5 MIN 0.5 Radius Typical
2.0 1.7
REV 1
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