MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor Low Cost 3 Stereo Inputs and 4-Channel Outputs Volume, Balance, Fader and Selectable Input Gain FEATURES APPLICATIONS •Operation range : 2.7V ~ 6.5V •3 stereo inputs with selectable input gain •4 independent speaker controls for fader and balance •Independent mute function •Volume control in 1.25 dB/step •I2C interface •Components less and good PSRR •Portable audio device •Car stereo audio •Hi-Fi audio system •Cross-reference: MS6720 •Housed in SSOP20 packages DESCRIPTION The MS6720L is a 3 stereo inputs/4-channel outputs digital control audio processor for the low voltage operation. Volume, balance (left/right), and fader (front/rear) processor are incorporated into a single chip. The MS6720L also has selectable input gain. All functions are programmable via the serial I 2C bus. The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage are 0dB. The stereo 4 is connected internally, but not available on pins. BLOCK DIAGRAM LOUT 13 LIN 12 Speaker ATT 17 OUT_LF Mute LIN1 LIN2 LIN3 11 10 9 Volume 15 OUT_LR Mute Input Selector &Gain Control RIN3 RIN2 RIN1 Speaker ATT 20 SCL 19 SDA 18 DGND Serial Bus Decoder and Latches 6 7 8 Volume Speaker ATT 16 OUT_RF Mute Speaker ATT Supply 2 3 1 5 AVDD AGND REF ROUT REV 2 14 OUT_RR Mute 4 RIN 1/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor PIN CONFIGURATION Symbol REF VDD Pin 1 2 Description Analog Reference Voltage（1/2VDD） Supply Input Voltage AGND 3 Analog Ground RIN ROUT 4 5 Audio Processor Right Channel Input Gain Output and Input Selector for Right Channel RIN3 RIN2 6 7 Right Channel Input 3 Right Channel Input 2 RIN1 LIN3 8 9 Right Channel Input 1 Left Channel Input 3 LIN2 10 Left Channel Input 2 RIN3 6 LIN1 LIN 11 12 Left Channel Input 1 Audio Processor Left Channel Input RIN2 7 14 OUT_RR RIN1 8 13 LOUT LOUT OUT_RR 13 14 Gain Output and Input Selector for Left Channel Right Rear Speaker Output LIN3 9 12 LIN LIN2 10 11 LIN1 OUT_LR 15 Left Rear Speaker Output OUT_RF OUT_LF 16 17 Right Front Speaker Output Left Front Speaker Output DGND 18 Digital Ground SDA 19 I2C Data Input SCL 20 I2C Clock Input REF 1 20 SCL VDD 2 19 SDA AGND 3 18 DGND RIN 4 17 OUT_LF ROUT 5 16 OUT_RF MS6720L 15 OUT_LR SSOP20 ORDERING INFORMATION Package Part number Packaging Marking Transport Media 20-Pin SSOP (lead free) MS6720SSLTR MS6720L 2.5k Units Tape and Reel 20-Pin SSOP (lead free) MS6720SSLU MS6720L 56 Units Tube ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit 6.5 V -3000 to 3000 V VDD Supply Voltage VESD Electrostatic Handling TSTG Storage Temperature Range -65 to 150 ℃ 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 SSOP20 210 REV 2 2/12 ℃/W www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor OPERATING RATINGS Symbol VDD Parameter Supply Voltage Min Typ Max Unit 2.7 - 6.5 V 5V ELECTRICAL CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) Symbol Parameter Conditions Min Typ Max Unit - 11.2 - mA Supply IQ Quiescent Current VIN=0V PSRR Power Supply Rejection Ratio CREF = 22uF, f = 100Hz 50 55 - dB Input Selectors RIN Input Resistance Input 1,2,3 35 50 70 kΩ GIN Input Gain Range Gain 0 - 11.25 dB GSTEP Step Resolution - 3.75 - dB ERRG Gain Setting error -0.5 0 0.5 dB -78.75 - 0 dB - 1.25 - dB Av = 0 to -40dB -1 0 1 dB Av = -40 to -60dB -5 0 5 dB Volume control CRVOL Volume Control Range RESVOL Volume Step Resolution ERRVOL Volume Setting Error Attenuation Speaker Attenuators CRSPK Speaker Control Range -37.5 - 0 dB RESSPK Speaker Step Resolution Attenuation - 1.25 - dB ERRSPK Speaker Setting Error -1 0 1 dB MUTE Output Mute Attenuation - -55 -50 dB General VOMAX Maximum Output Voltage Swing (THD+N)/S <0.3% - 4.3 - Vpp -65 0.056 - dB % THD+N Total Harmonic Distortion Plus Noise VOUT=2Vpp - S/N Signal-to-Noise Ratio VOUT=4Vpp - 85 - dB CS Channel Separation Left/Right 80 85 - dB VIH Bus High Input Level 2 - - V VIL Bus Low Input Level - - 0.8 V Bus Input REV 2 3/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor 2.7V ELECTRICAL CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) Symbol Parameter Conditions Min Typ Max Unit Supply IQ Quiescent Current VIN=0V PSRR Power Supply Rejection Ratio CREF = 22uF, f = 100Hz VOMAX Maximum Output Voltage Swing (THD+N)/S <0.3% THD+N Total Harmonic Distortion Plus Noise VOUT=2Vpp S/N Signal-to-Noise Ratio VOUT=2.4Vpp CS Channel Separation Left/Right - 8.7 - mA 48 53 - dB - 2.4 - Vpp - -48 - dB General - 0.4 - % 80 85 - dB 80 85 - dB TYPICAL PERFORMANCE CHARACTERISTICS (Ta=25℃, All stages 0dB, f=1kHz, CREF =22uF, refer to the application circuit; unless otherwise specified) f=1kHz THD+N (%) VDD=2.7V VO=2Vpp THD+N (%) THD+N (%) f=20Hz f=20kHz f=20Hz VDD=5V VO=2Vpp f=1kHz VDD=5V VDD=2.7V OUTPUT VOLTAGE (dBV) OUTPUT VOLTAGE (dBV) THD+N vs. Frequency THD+N vs. Output Voltage THD+N vs. Output Voltage CAP=10uF VDD=5V VRR=-20dBV PSRR (dB) PSRR (dB) CAP=22uF CAP=10uF VDD=2.7V VRR=-20dBV CHANNEL SEPARATION (dB) FREQUENCY (Hz) CAP=22uF REV 2 f=20kHz VDD=2.7V VIN=-3dBV VDD=5V VIN=0dBV FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) PSRR vs. Frequency PSRR vs. Frequency Channel Separation vs. Frequency 4/12 www.mosanalog.com MOSA MS6720L QUIESCENT CURRENT (mA) Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor SUPPLY VOLTAGE (V) Quiescent Current vs. Supply Voltage 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. REV 2 5/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor 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 (9 th) clock pulse. In this case, the master transmitter can generate the STOP information in order to abort the transfer. 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 6/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor BUS INTERFACE Data are transmitted to and from the MCU to the MS6720L 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 MS6720L Interface Protocol The format consists of the following •A START condition •A chip address byte including the MS6720L address. (7bits) •The 8th bit of the byte must be “0”.(write=0, read=1) •MS6720L must always acknowledge the end of each transmitted byte. •A data sequence (N-bytes + Acknowledge) •A STOP condition SDA SCL 1-7 8 9 ADDRESS R / -W ACK 1-7 8 9 1-7 8 9 S P START CONDITION DATA ACK DATA ACK STOP CONDITION Address Code The chip address of the MS6720L is 88H. 1 0 0 0 1 0 7 bits address 0 0 W MS6720L address REV 2 7/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor Data Bytes Description The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage are 0dB. MSB LSB Function 0 0 B2 B1 B0 A2 A1 A0 Volume Control 1 1 0 B1 B0 A2 A1 A0 Speaker ATT LR 1 1 1 B1 B0 A2 A1 A0 Speaker ATT RR 1 0 0 B1 B0 A2 A1 A0 Speaker ATT LF 1 0 1 B1 B0 A2 A1 A0 Speaker ATT RF 0 1 0 G1 G0 1 S1 S0 Audio Switch Where Ax = 1.25dB/step; Bx = 10dB/step; Cx = 2dB/step; Gx = 3.75dB/step Volume MSB 0 0 0 0 B2 B1 B0 LSB Function A2 A1 A0 Volume 1.25 dB steps 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 A2 A1 A0 Volume 10dB steps B2 B1 B0 0 0 0 0 0 0 1 -10 0 1 0 -20 0 1 1 -30 1 0 0 -40 1 0 1 -50 1 1 0 -60 1 1 1 -70 The default volume is –78.75dB. REV 2 8/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor Speaker Attenuator MSB LSB Function（dB） 1 0 0 B1 B0 A2 A1 A0 Speaker LF 1 0 1 B1 B0 A2 A1 A0 Speaker RF 1 1 0 B1 B0 A2 A1 A0 Speaker LR 1 1 1 B1 B0 A2 A1 A0 Speaker RR 0 0 0 0 0 0 1 -1.25 0 1 0 -2.5 0 1 1 -3.75 1 0 0 -5 1 0 1 -6.25 1 1 0 -7.5 1 1 1 -8.75 0 0 0 0 1 -10 1 0 -20 1 1 -30 1 1 1 1 1 Mute LSB Function S1 S0 Audio Switch 0 0 Stereo 1 0 1 Stereo 2 1 0 Stereo 3 1 1 *Stereo 4 LF: Left Front, RF: Right Front, LR: Left Rear, RR: Right Rear The default state is mute. Audio Switch MSB 0 1 0 G1 G0 1 0 0 +11.25dB 0 1 +7.5dB 1 0 +3.75dB 1 1 0dB * The stereo 4 is connected internally, but not available on pins. The default state is stereo 4 and gain 0dB. REV 2 9/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor Examples Set Volume at –37.5dB. MSB Start Data byte LSB MS6720L Address ACK 0 0 0 1 1 1 -30dB 1 0 ACK Stop 0 ACK Stop 1 1 ACK Stop 0 1 ACK Stop -7.5dB Set Speaker RF at –30dB. MSB Start Data byte LSB MS6720L Address ACK 1 0 1 Speaker RF 1 1 0 -30dB 0 0dB Set Speaker RR in mute-on. MSB Start Data byte LSB MS6720L Address ACK 1 1 1 1 1 Speaker RR 1 Mute Set Stereo 2 Input with gain of +7.5dB MSB Start MS6720L Address Data byte LSB ACK 0 1 0 0 1 1 +7.5dB Stereo 2 REV 2 10/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor APPLICATION INFORMATION Basic Application Example 2.2u MCU 18 19 20 13 12 LIN LOUT SCL SDA DGND 10u 2.2u 11 8 10 INPUT 7 9 6 OUT_LF LIN1 RIN1 17 10u OUT_LR LIN2 RIN2 15 MS6720L OUTPUT 10u OUT_RF LIN3 RIN3 16 10u 2.2u OUT_RR 1 RIN ROUT 3 REF AGND AVDD 2 14 5 4 22u AVDD REV 2 2.2u 11/12 www.mosanalog.com MOSA MS6720L Low Cost 3 Stereo Inputs / 4-Channel Outputs Audio Processor EXTERNAL DIMENSIONS SSOP20 D Detail A E1 E H x 45 c ZD A2 A θ 2 e b θ 1 A1 R1 L1 R θ Detail A Symbol A A1 A2 b c e D E E1 L h L1 ZD R1 R θ θ1 θ2 REV 2 Dimension in mm Min Max 1.35 1.75 0.10 0.25 1.50 0.20 0.30 0.18 0.25 0.635 BASIC 8.56 8.74 5.79 6.20 3.81 3.99 0.41 1.27 0.25 0.50 0.254 BASIC 1.4732 REF 0.20 0.33 0.20 o o 0 8 o 0 o o 5 15 L Dimension in inch Min Max 0.053 0.069 0.004 0.010 0.059 0.008 0.012 0.007 0.010 0.025 BASIC 0.337 0.344 0.228 0.244 0.150 0.157 0.016 0.050 0.010 0.020 0.010 BASIC 0.058 REF 0.008 0.013 0.008 o o 0 8 o 0 o o 5 15 12/12 www.mosanalog.com