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MOSA
MS6266
6-Channel Electronic Volume Controller
6-Channel Volume Controller Gain and Attenuation 16~-79dB Low voltage, High Channel Separation
FEATURES
Operation range: 2.7V~5.5V Low power consumption Gain/Attenuation: 16dB to -79dB at 1dB/step Good PSRR I2C interface Pop noise free Housed in SSOP20, SOP20
APPLICATIONS
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 IN1 IN2 IN3 AC2 DGND SCL SDA IN4 IN5 IN6 OUT6 OUT5 OUT4 GND VREF VDD AC1 OUT3 OUT2 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
st
Description 1 channel input 2nd channel input 3rd channel input Address code 2 Digital Ground I2C clock input I2C data input 4 channel input 5th channel input 6th channel input 6th channel output 5th channel output 4 channel output Analog ground Reference voltage = 1/2VDD Positive supply voltage Address code 1 3rd channel output 2nd channel output
th th
IN1 1 IN2 2 IN3 3 AC2 4 DGND 5 SCL 6 SDA 7 IN4 8 IN5 9 IN6 10
20 OUT1 19 OUT2 18 OUT3 17 AC1
MS6266
16 VDD 15 VREF 14 GND 13 OUT4 12 OUT5 11 OUT6
OUT1 20 1st channel output Note: 1. The address codes have four types, selected by AC1and AC2.
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BLOCK DIAGRAM
IN1
-1dB/Step -10dB/Step
MS6266
6-Channel Electronic Volume Controller
2dB/Step
OUT1
IN2
-1dB/Step
-10dB/Step
2dB/Step
OUT2
IN6
-1dB/Step
-10dB/Step
2dB/Step
OUT6
VREF
AC1 AC2 I C Interface
2
Reference source
VDD GND
SCL
SDA
DGND
VREF
ORDERING INFORMATION
Package 20-Pin SOP 20-Pin SOP 20-Pin SOP (lead free) 20-Pin SOP (lead free) 20-Pin SSOP 20-Pin SSOP 20-Pin SSOP (lead free) 20-Pin SSOP (lead free) Part number MS6266TR MS6266U MS6266GTR MS6266GU MS6266SSTR MS6266SSU MS6266SSGTR MS6266SSGU Packaging Marking MS6266 MS6266 MS6266G MS6266G MS6266 MS6266 MS6266G MS6266G Transport Media 1k Units Tape and Reel 35 Units Tube 1k Units Tape and Reel 35 Units Tube 2.5k Units Tape and Reel 50 Units Tube 2.5k Units Tape and Reel 50 Units Tube
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 SOP20 SSOP20 Parameter Rating 6 -3000 to 3000 -65 to 150 -40 to 85 150 260 210 210 /W Unit V V
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OPERATING RATINGS
Symbol VDD Supply Voltage Parameter
MS6266
6-Channel Electronic Volume Controller
Min 2.7
Typ -
Max 5.5
Unit V
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 AGA ASTEP EGA EIGA CS PSRR 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 Power supply rejection ratio 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=4.8Vpp (THD+N)/S < 0.1% Cap = 10uF (100Hz) Vin=0dBV Max gain Max attenuation 95 18 95 0.3VDD 10.4 16 -79 1 0.3 0.3 105 53 85 20 50 4.8 -69 100 11 100 -64 0.7VDD Vpp dB dB V V mA dB dB dB dB dB dB dB dB k
AC Characteristics
Bus Characteristics
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 CS PSRR MUTE Vo THD+N S/N Quiescent current Channel separation Power supply rejection ratio Mute Attenuation Maximum output voltage swing Total harmonic distortion plus noise Signal-to-noise ratio VO=2.6Vpp Cap = 10uF (100Hz) Vin=-3dBV (THD+N)/S < 0.1% 90 85 8.2 100 51 80 2.6 -69 90 8.8 -64 mA dB dB dB Vpp dB dB
AC Characteristics
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TYPICAL PERFORMANCE CHARACTERISTICS
(Ta=25 , RL=100k, VREF Cap=10uF; unless otherwise specified)
MS6266
6-Channel Electronic Volume Controller
f=20kHz f=20Hz f=20Hz
f=20kHz f=20Hz
f=20kHz
THD+N (%)
THD+N (%)
f=1kHz
THD+N (%)
f=1kHz
f=1kHz
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
VDD=5V VO=0dBV
CHANNEL SEPARATION (dB)
VDD=3.3V VO=-3dBV
VDD=2.7V VO=-3dBV
THD+N (%)
VDD=3.3V VO=-3dBV
VDD=2.7V VO=-3dBV
VDD=5V VO=0dBV
FREQUENCY (Hz)
FREQUENCY (Hz)
QUIESCENT CURRENT (mA)
SUPPLY VOLTAGE (V)
THD+N vs. frequency
Channel separation vs. frequency
Quiescent current vs. supply voltage
CAP=22uF
CAP=22uF CAP=22uF
PSRR (dB)
PSRR (dB)
CAP=10uF
CAP=10uF
PSRR (dB)
CAP=10uF
CAP=2.2uF
CAP=2.2uF
CAP=2.2uF VDD=5V VRR=-20dBV 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
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I2C BUS DESCRIPTION
Start and stop conditions
MS6266
6-Channel Electronic Volume Controller
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.
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Timing of SDA and SCL bus lines
SDA tf SCL
MS6266
6-Channel Electronic Volume Controller
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)
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BUS INTERFACE
MS6266
6-Channel Electronic Volume Controller
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
9
1-7
8
9
1-7
8
9
S START CONDITION ADDRESS R / -W ACK DATA ACK DATA ACK
P STOP CONDITION
Address code The MS6266 has four address codes, they were selected by AC1(pin17)and AC2(pin4). AC1 0 0 1 1 AC2 0 1 0 1 Address code 80H 84H 88H 8CH
7 bits address MS6266 address W 1 0
AC1=1, AC2=0
0 0 1 0 0 0
0: connected to GND, 1: connected to VDD
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Data bytes description Function bits MSB 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 A3 B3 A3 B3 A3 B3 A3 B3 A3 B3 A3 B3 A3 B3 0 1 1 A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 A2 B2 0 0 0 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 A1 B1 0 0 0 LSB A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 A0 B0 1 1 0
MS6266
6-Channel Electronic Volume Controller
Function 6 channels, -1dB/step 6 channels, -10dB/step or +2dB/step Channel 3, -1dB/step Channel 3, -10dB/step or +2dB/step Channel 4, -1dB/step Channel 4, -10dB/step or +2dB/step Channel 2, -1dB/step Channel 2, -10dB/step or +2dB/step Channel 5, -1dB/step Channel 5, -10dB/step or +2dB/step Channel 1, -1dB/step Channel 1, -10dB/step or +2dB/step Channel 6, -1dB/step Channel 6, -10dB/step or +2dB/step Power off preparation (pop noise free) 6 channels, mute On 6 channels, mute Off
Gain / Attenuation bits A3 B3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A2 B2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A1 B1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A0 B0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Gain / Attenuation value (dB) A 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 B 0 -10 -20 -30 -40 -50 -60 -70 +2 +4 +6 +8 +10 +12 +14 +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.
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Examples
MSB Start 80H, 84H, 88H, 8CH MS6266 Address LSB ACK 1 1 1 Data byte 1 1 0 0 0 ACK
MS6266
6-Channel Electronic Volume Controller
Mute off The initial condition is -79dB and mute on when power on. The first command must disable the mute function.
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 0 0 1 0 0 0 0 ACK Stop
Ch 1, -10dB/step, 0dB
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 1 1 1 0 1 1 0 ACK Stop
Ch 5, -10dB/step, 0dB
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 0 0 1 0 0 1 1 ACK Stop
Ch 3, -10dB/step, -30dB
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 0 0 0 1 0 0 0 1 ACK Stop
Ch 3, +2dB/step, 4dB
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
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APPLICATION INFORMATION
Basic application example
MS6266 10uF Signal-1 In 1 10k 10uF Signal-2 In 2 10k 10uF Signal-3 In 3 10k 4 IN3 OUT3 18 10uF IN2 OUT2 19 IN1 OUT1 20 10uF
MS6266
6-Channel Electronic Volume Controller
10k 10uF 10k
Signal-1 Out
Signal-2 Out
10k 17
Signal-3 Out
AC2
AC1
5
DGND
VDD VREF GND
16
Supply 2.7~5V 0.1uF 10uF 10uF
6 MCU 7 10uF Signal-4 In 10k 10uF Signal-5 In 10k 10uF Signal-6 In 10 10k 9
SCL
15
SDA
14 10uF 10k 12 10uF 10k 10uF Signal-5 Out Signal-4 Out
8
IN4
OUT4
13
IN5
OUT5
IN6
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
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EXTERNAL DIMENSIONS
SSOP20
D
MS6266
6-Channel Electronic Volume Controller
Detail A
Symbol
E1 E
H x 45 c ZD
A2
A 2
A A1 A2 b c e D E E1 L h L1 ZD R1 R 1 2
R1
e
b
A1
1
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
L1
R
Detail A
L
SOP20 (300mil)
D
Detail A
Symbol
E H
h x 45 C
A A1 B C e D E H L h
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
Detail A
L
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