MOSA MS6266

MOSA
MS6266
6-Channel Electronic Volume Controller
6-Channel Volume Controller
Gain and Attenuation 16~-79dB
Low Voltage, High Channel Separation
FEATURES
APPLICATIONS
‧Operation range: 2.7V~6.5V
‧Low power consumption
‧Gain/Attenuation: 16dB to –79dB at 1dB/step
‧Good PSRR
‧I2C interface
‧Pop noise free
‧Housed in SSOP20, SOP20
‧Multimedia system
‧Hi-Fi audio system
‧Car audio
‧Portable audio equipment
DESCRIPTION
The MS6266 is a 6-channel volume controller IC with gain and attenuation. It uses CMOS technology specially for the
low voltage application with low noise, rail-to-rail output. The MS6266 provide an I2C control interface with gain /
attenuation range of 16dB to -79dB, 1dB/step. The initial condition is set to be maximum attenuation –79dB and mute
on mode when the power is on.
PIN CONFIGURATION
Symbol
Pin
Description
st
IN1
1
1 channel input
IN2
2
2nd channel input
IN3
3
3rd channel input
AC2
4
Address code 2
DGND
5
Digital Ground
SCL
6
I2C clock input
SDA
7
I2C data input
th
IN4
8
4 channel input
IN5
9
5th channel input
IN6
10
6th channel input
OUT6
11
6th channel output
OUT5
12
5th channel output
13
4 channel output
GND
14
Analog ground
VREF
15
Reference voltage = 1/2VDD
VDD
16
Positive supply voltage
AC1
17
Address code 1
OUT3
18
3rd channel output
OUT2
19
2nd channel output
20 OUT1
IN2 2
19 OUT2
IN3 3
18 OUT3
AC2 4
17 AC1
DGND 5
SCL 6
th
OUT4
IN1 1
MS6266
16 VDD
15 VREF
SDA 7
14 GND
IN4 8
13 OUT4
IN5 9
12 OUT5
IN6 10
11 OUT6
OUT1
20
1st channel output
Note: 1. The address codes have four types, selected by AC1and AC2.
REV 2
1/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
BLOCK DIAGRAM
IN1
IN2
IN6
-1dB/Step
-10dB/Step
2dB/Step
-1dB/Step
-10dB/Step
2dB/Step
-1dB/Step
-10dB/Step
2dB/Step
OUT1
OUT2
OUT6
VREF
AC1
I C Interface
AC2
SCL
SDA
VDD
Reference
source
2
DGND
GND
VREF
ORDERING INFORMATION
Package
Part number
Packaging Marking
Transport Media
20-Pin SOP (lead free)
MS6266GTR
MS6266G
1k Units Tape and Reel
20-Pin SOP (lead free)
MS6266GU
MS6266G
35 Units Tube
20-Pin SSOP (lead free)
MS6266SSGTR
MS6266G
2.5k Units Tape and Reel
20-Pin SSOP (lead free)
MS6266SSGU
MS6266G
50 Units Tube
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Rating
Unit
6.5
V
-3000 to 3000
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
SOP20
SSOP20
210
210
℃/W
OPERATING RATINGS
Symbol
VDD
REV 2
Parameter
Supply Voltage
2/13
Min
Typ
Max
Unit
2.7
-
6.5
V
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MOSA
MS6266
6-Channel Electronic Volume Controller
5V ELECTRICAL CHARACTERISTICS
(VDD=5.0V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1kHz, VO=0dBV, VREF Cap=10uF; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
DC Characteristics
IQ
Quiescent current
AGA
Gain/Attenuation
ASTEP
Gain/Attenuation step
-
10.4
11
mA
Max gain
-
16
-
dB
Max attenuation
-
-79
-
dB
-
1
-
dB
EGA
Gain/Attenuation step error
-
0.3
-
dB
EIGA
Interchannel gin/attenuation error
-
0.3
-
dB
CS
Channel separation
95
105
-
dB
PSRR
Power supply rejection ratio
Cap = 10uF (100Hz)
-
53
-
dB
MUTE
Mute Attenuation
Vin=0dBV
-
85
-
Rin
Input Impedance
Rout
Output Impedance
18
20
-
dB
kΩ
-
50
100
Ω
-
4.8
-
Vpp
-
-69
-64
dB
95
100
-
dB
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=4.8Vpp
Bus Characteristics
VIH
Bus high input level
-
-
0.7VDD
V
VIL
Bus low input level
0.3VDD
-
-
V
2.7V ELECTRICAL CHARACTERISTICS
(VDD=2.7V, VSS=0V, Attenuation=0dB, Gain=0dB, f=1kHz, VO=-3dBV, VREF Cap=10uF; unless otherwise specified)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
DC Characteristics
IQ
Quiescent current
-
8.2
8.8
mA
CS
Channel separation
90
100
-
dB
PSRR
Power supply rejection ratio
Cap = 10uF (100Hz)
-
51
-
dB
MUTE
Mute Attenuation
Vin=-3dBV
-
80
-
dB
(THD+N)/S < 0.1%
-
2.6
-
Vpp
-
-69
-64
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 2
VO=2.6Vpp
3/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25℃, RL=100k, VREF Cap=10uF; unless otherwise specified)
f=20kHz
f=20kHz
f=20kHz
f=20Hz
f=1kHz
VDD=5V
THD+N (%)
f=20Hz
THD+N (%)
THD+N (%)
f=20Hz
f=1kHz
VDD=3.3V
f=1kHz
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
VDD=2.7V
VO=-3dBV
VDD=5V
VO=0dBV
VDD=3.3V
VO=-3dBV
VDD=2.7V
VO=-3dBV
QUIESCENT CURRENT (mA)
VDD=3.3V
VO=-3dBV
CHANNEL SEPARATION (dB)
THD+N (%)
VDD=5V
VO=0dBV
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
THD+N vs. frequency
Channel separation vs. frequency
Quiescent current vs. supply voltage
CAP=22uF
CAP=22uF
CAP=2.2uF
CAP=10uF
CAP=2.2uF
PSRR (dB)
CAP=10uF
PSRR (dB)
PSRR (dB)
CAP=22uF
CAP=10uF
CAP=2.2uF
VDD=5V
VRR=-20dBV
REV 2
VDD=3.3V
VRR=-20dBV
VDD=2.7V
VRR=-20dBV
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR vs. frequency
PSRR vs. frequency
PSRR vs. frequency
4/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
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
Stop
Start
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 2
5/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
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 2
6/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
BUS INTERFACE
Data are transmitted to and from the MCU to the MS6266 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
MS6266
Interface protocol
The format consists of the following
‧A START condition
‧A chip address byte including the MS6266 address. (7bits)
‧The 8th bit of the byte must be “0”.(write=0, read=1)
‧MS6266 must always acknowledge the end of each transmitted byte.
‧A data sequence (N-bytes + Acknowledge)
‧A STOP condition
SDA
SCL
1-7
8
ADDRESS
W
R / --
9
1-7
8
9
1-7
8
9
S
START
CONDITION
P
ACK
DATA
ACK
DATA
ACK
STOP
CONDITION
Address code
The MS6266 has four address codes, they were selected by AC1(pin17)and AC2(pin4).
AC1
AC2
Address code
0
0
80H
0
1
84H
1
0
88H
1
1
8CH
AC1=1, AC2=0
1
0
0
0
1
0
7 bits address
0
0
W
MS6266 address
0: connected to GND, 1: connected to VDD
REV 2
7/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
Data bytes description
Function bits
MSB
LSB
Function
1
1
1
0
A3
A2
A1
A0
6 channels, -1dB/step
1
1
0
1
B3
B2
B1
B0
6 channels, -10dB/step or +2dB/step
0
0
0
1
A3
A2
A1
A0
Channel 3, -1dB/step
0
0
0
0
B3
B2
B1
B0
Channel 3, -10dB/step or +2dB/step
0
0
1
1
A3
A2
A1
A0
Channel 4, -1dB/step
0
0
1
0
B3
B2
B1
B0
Channel 4, -10dB/step or +2dB/step
0
1
0
1
A3
A2
A1
A0
Channel 2, -1dB/step
0
1
0
0
B3
B2
B1
B0
Channel 2, -10dB/step or +2dB/step
0
1
1
1
A3
A2
A1
A0
Channel 5, -1dB/step
0
1
1
0
B3
B2
B1
B0
Channel 5, -10dB/step or +2dB/step
1
0
0
1
A3
A2
A1
A0
Channel 1, -1dB/step
1
0
0
0
B3
B2
B1
B0
Channel 1, -10dB/step or +2dB/step
1
0
1
1
A3
A2
A1
A0
Channel 6, -1dB/step
1
0
1
0
B3
B2
B1
B0
Channel 6, -10dB/step or +2dB/step
0
0
0
1
Power off preparation (pop noise free)
1
0
0
1
6 channels, mute On
1
0
0
0
6 channels, mute Off
1
1
1
1
Gain / Attenuation bits
A3
A2
A1
A0
Gain / Attenuation value (dB)
B3
B2
B1
B0
A
B
0
0
0
0
0
0
0
0
0
1
-1
-10
0
0
1
0
-2
-20
0
0
1
1
-3
-30
0
1
0
0
-4
-40
0
1
0
1
-5
-50
0
1
1
0
-6
-60
0
1
1
1
-7
-70
1
0
0
0
-8
+2
1
0
0
1
-9
+4
1
0
1
0
-
+6
1
0
1
1
-
+8
1
1
0
0
-
+10
1
1
0
1
-
+12
1
1
1
0
-
+14
1
1
1
1
-
+16
1. Where Ax=-1dB/step, Bx=-10dB/step or +2dB/step, -10dB and +2dB should not be loaded at the same time.
2. The initial condition is set to be maximum attenuation –79dB and mute on mode when the power on.
3. The output will drop down to ground gradually when enable power off preparation.
4. Odd gain 2N-1= N*(+2dB/step) + (-1dB), where N = 1~8. Please reference to examples.
REV 2
8/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
Examples
Mute off
The initial condition is –79dB and mute on when power on. The first command must disable the mute function.
MSB
Start
Data byte
LSB
ACK
80H, 84H, 88H, 8CH
1
1
MS6266 Address
1
1
1
0
0
0
ACK
Stop
6 channels, Mute off
Set gain of 1st channel at 0dB
Start
MS6266 Address
ACK
1
0
0
0
0
0
0
0
ACK
1
Ch 1, -10dB/step, 0dB
0
0
1
0
0
0
0
ACK
Stop
0
ACK
Stop
1
ACK
Stop
1
ACK
Stop
Ch 1, -1dB/step, 0dB
Set attenuation of 5th channel at -6dB
Start
MS6266 Address
ACK
0
1
1
0
0
0
0
0
ACK
0
Ch 5, -10dB/step, 0dB
1
1
1
0
1
1
Ch 5, -1dB/step, -6dB
Set attenuation of 3rd channel at –33dB
Start
MS6266 Address
ACK
0
0
0
0
0
0
1
1
ACK
0
Ch 3, -10dB/step, -30dB
0
0
1
0
0
1
Ch 3, -1dB/step, -3dB
Set gain of 3rd channel at 3dB
Start
MS6266 Address
ACK
0
0
0
0
1
0
0
1
ACK
Ch 3, +2dB/step, 4dB
0
0
0
1
0
0
0
Ch 3, -1dB/step, -1dB
Odd gain 3dB = 2*2-1 = 2*(+2dB)+(-1dB)
Set power off preparation command to prevent pop noise before power is off.
Start
MS6266 Address
ACK
1
1
1
1
0
0
0
1
ACK
Stop
Power off preparation
REV 2
9/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
APPLICATION INFORMATION
Basic application example
MS6266
10uF
Signal-1 In
10k
10uF
Signal-2 In
1 IN1
OUT1 20
2 IN2
OUT2 19
10uF
10uF
10k
10uF
3 IN3
10k
OUT3 18
5 DGND
6 SCL
VDD
16
VREF
15
MCU
Supply
0.1uF
10k
10uF
7 SDA
GND 14
8 IN4
OUT4 13
9 IN5
OUT5 12
10uF
10k
10k
10uF
Signal-5 Out
10uF
10 IN6
10k
Signal-4 Out
10uF
10k
Signal-6 In
10uF
10uF
10uF
Signal-5 In
Signal-3 Out
10k
AC1 17
4 AC2
Signal-4 In
Signal-2 Out
10k
10uF
Signal-3 In
Signal-1 Out
10k
OUT6 11
10k
Signal-6 Out
AC1=Hi, AC2=Lo, Address=88H
Basic application flow chart
Procedure Of Power On
Procedure Of Power Off
Power on
VDD = 5V
Volume Control
volume down to -79 dB
step by step
Initial Conditions
function off (-79dB)
mute on
Enable Mute Function
mute on
Pop Noise Free
wait 1 sec
Pop Noise Free
power off preparation
wait 0.5 sec
Disable Mute Function
mute off
Power off
VDD = 0V
Volume Control
volume up/down
step by step
REV 2
10/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
EXTERNAL DIMENSIONS
SSOP20
D
Detail A
Symbol
E1
A
A1
A2
b
c
e
D
E
E1
L
h
L1
ZD
R1
R
θ
θ1
θ2
E
H x 45
c
ZD
A2
A
θ2
e
b
A1
θ1
Dimension in mm Dimension in inch
Min
Max
Min
Max
1.35
1.75
0.053
0.069
0.10
0.25
0.004
0.010
1.50
0.059
0.20
0.30
0.008
0.012
0.18
0.25
0.007
0.010
0.635 BASIC
0.025 BASIC
8.56
8.74
0.337
0.344
5.79
6.20
0.228
0.244
3.81
3.99
0.150
0.157
0.41
1.27
0.016
0.050
0.25
0.50
0.010
0.020
0.254 BASIC
0.010 BASIC
1.4732 REF
0.058 REF
0.20
0.33
0.008
0.013
0.20
0.008
o
o
o
0
8
0
8o
0o
0o
5o
15o
5o
15o
R1
L1
R
θ
L
Detail A
SOP20 (300mil)
D
Detail A
Symbol
E
A
A1
B
C
e
D
E
H
L
h
θ
H
h x 45
C
Dimension in mm
Min
Max
2.35
2.65
0.10
0.30
0.33
0.51
0.23
0.32
1.27 BSC
12.6
13
7.4
7.60
10.00
10.65
0.40
1.27
0.25
0.75
o
8o
0
Dimension in inch
Min
Max
0.0926 0.1043
0.004 0.0118
0.013
0.020
0.0091 0.0125
0.050 BSC
0.4961 0.5118
0.2914 0.2992
0.394
0.419
0.016
0.050
0.010
0.029
0o
8o
A
A1
e
B
0.25mm
θ
Detail A
REV 2
11/13
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MOSA
MS6266
6-Channel Electronic Volume Controller
DEMO BOARD
4
1
1
5
2
3
版面說明
1.電源輸入：AVDD及DVCC兩組電源皆使用2.7V~6.5V。
2.控制鍵：
VOL+：音量控制鍵，每按一下此鍵+1dB，最大+16dB，當按下此鍵時指示燈（+）閃爍一次，音量控制達最
大（+16dB）時，則指示燈（+）保持在亮的狀態，系統啟動時之預設值為0dB。
VOL-：音量控制鍵，每按一下此鍵-1dB，最小-79dB，當壓下此鍵時指示燈（-）閃爍一次，音量控制達最
小（-79dB）時，則指示燈（-）保持在亮的狀態。
MUTE：MUTE ON/OFF 開關，系統啟動時為MUTE OFF。
CH：通道選擇鍵，作為選擇欲控制音量之通道（CH1~CH6或All Channel），選擇的通道如指示燈所示，當選
擇Channel 1則指示燈（CH1）亮，選擇All Channel時指示燈CH1~CH6）同時為亮，預設值為All
Channel。
RESET：MCU重置鍵，按下此鍵可重置MCU狀態，在此表示系統返回預設值。
3.輸入端：由左至右分別為IN1~IN6，請連接於訊號源。
4.輸出端：由左至右分別為OUT1~OUT6請接於後級功率放大器。
5.位址選擇：參考MS6266 Data sheet並請使用短路環決定AC1及AC2之準位以決定使用之位址，此Demo board
使用之位址為88H，如下圖所示。
REV 2
H
H
AC2
AC1
L
L
12/13
www.mosanalog.com
MOSA
MS6266
6-Channel Electronic Volume Controller
Circuit:
1
2
J14
AVDD
J16
2
4
6
104
+
10u
J15
DVCC
C14
C17
2
1
1
3
5
AC2
AC1
U1
1
2
3
4
5
6
7
8
9
10
IN1
IN2
IN3
AC2
DGND
SCL
SDA
IN4
IN5
IN6
OUT1
OUT2
OUT3
AC1
VDD
VREF
GND
OUT4
OUT5
OUT6
20
19
18
17
16
15
14
13
12
11
C18
+
104
C15
10u
RESET
S5
+
10u
10uF
C16
R13 10k
C13
C19
20pF
12M
C20
20pF
S1
S2
S3
S4
10u * 12
+
C1
100K * 12
R1
+
C2
R2
+
C3
R3
+
C4
R4
+
C5
R5
+
C6
+
+
C7
R6
+
C8
+
C9
R8
R7
+
C10
R9
U3
+
MS6266
MUTE
CH
+
-
1
2
3
4
5
6
7
8
9
10
RST
P3.0
P3.1
XTAL2
XTAL1
P3.2
P3.3
P3.4
P3.5
GND
Vcc
P1.7
P1.6
P1.5
P1.4
P1.3
P1.2
P1.1
P1.0
P3.7
AT89C2051
20
19
18
17
16
15
14
13
12
11
R14
R15
R16
R17
R18
R19
R20
R21
1k * 8
D8
CH1
D7
CH2
D6
CH3
D5
CH4
D4
CH5
D3
CH6
D2
VOL+
D1
VOL-
+
C11
R10
C12
R11
R12
R22
REV 2
1
2
1
2
2
1
J6
IN6
1
2
J5
IN5
1
2
J4
IN4
2
1
2
1
2
1
J3
IN3
1
2
J2
IN2
1
2
J1
IN1
2
1
2
1
10
J7
OUT6
J8
OUT5
J9
OUT4
J10
OUT3
J11
OUT2
J12
OUT1
13/13
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