SM7346A

SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER SM7346A GENERAL DESCRIPTION The SM7346A is 6 channels electronic volume controlled by 3-wire serial data. The IC is suitable for use in DVD systems and AV. FEATURES * 4 Output ports * Built-in microcomputer interface circuit controlled by 16-bit serial data. * Electronic volume Volume level: 0dB~-95dB, - ∞dB(1dB/step) * Tone control Bass/Treble, 0dB~+14dB(2dB/step) APPLICATIONS * DVD Receivers * Home Audio Equipment * AV PIN ASSIGNMENTS OUT4 OUT3 OUT2 OUT1 AVDD SWin GNDS SRin SLin GNDC Cin GNDR Rin GNDL Lin BYPASSR BYPASSL LTRE LBASS3 LBASS2 LBASS1 1 2 3 4 5 6 7 8 9 1 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 DVDD CLK DATA LATCH DGND AGND SWout SRout SLout Cout Rout Lout AVSS CL1 CL2 CR1 CR2 RTRE RBASS3 RBASS2 RBASS1 OUT4 OUT3 OUT2 OUT1 AVDD SWin GNDS SRin SLin GNDC Cin GNDR Rin GNDL Lin BYPASSR BYPASSL LTRE LBASS3 LBASS2 LBASS1 NC 1 2 3 4 5 6 7 8 9 1 0 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 DVDD CLK DATA LATCH DGND AGND SWout SRout SLout Cout Rout Lout AVSS CL1 CL2 CR1 CR2 RTRE RBASS3 RBASS2 RBASS1 NC SDIP 42PIN TSSOP 44PIN Page 1 MAY.2003 SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER SM7346A BLOCK DIAGRAM C input SW input SL input SR input BypassL BypassR volume C output SW output SL output SR output tone L input R input volume L output R output μ-com interface Latch Data CLK Page 2 MAY.2003 SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER PIN DESCRIPTION (Pin count base on 42pin SDIP) Pin No. 1 2 3 4 5 7 10 12 14 6 8 9 11 36 35 34 33 13 15 16 17 31 32 18 25 19 24 20 23 21 22 26 28 27 29 31 32 30 37 38 39 40 41 42 Symbol OUT4 OUT3 OUT2 OUT1 AVDD GNDS GNDC GNDR GNDL SW in SR in SL in C in SW out SR out SL out C out R in L in BYPASSR BYPASSL L out R out LTRE Tone Treble cycle control RTRE LBASS3 RBASS3 LBASS2 RBASS2 LBASS1 RBASS1 CR2 CL2 CR1 CL1 L out R out AVSS AGND DGND LATCH DATA CLK DVDD L.R Volume INPUT L OUTPUT R OUTPUT Analog negative Power supply Analog GND Digital GND Latch INPUT Data INPUT Clock INPUT Forward data Digital Power supply 27,29 70 KΩ (TYP) 18 to 22 KΩ (TYP) SM7346A Function Port OUTPUT Analog positive Power supply GND OUTPUT: PMOS Transistor open drain Circuit DVDD(=5V) 1 to 4 +7V Connect to analog GND Volume INPUT 6,8,9,11 18 to 22 KΩ (TYP) 33,34,35,36 Volume OUTPUT Tone INPUT L.R Volume INPUT in BYPASS mode L OUTPUT R OUTPUT 16,17 13,15 70 KΩ (TYP) 70 KΩ (TYP) 31,32 18 to 22 KΩ (TYP) 18,25 Tone Bass cycle control 19,24 2.3 KΩ (TYP) 20,23 21,22 Tone OUTPUT 26,28 31,32 -7V 39,40,41 S INPUT:schmitt trigger type +5V Page 3 MAY.2003 SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER SM7346A PIN CONFIGURATION AND IC INTERNAL BLOCK DIAGRAM ( Pin count base on 42pin ) OUT4 OUT3 OUT2 OUT1 SWin 1 2 3 4 6 volume OUTPUT PORT MCU volume I/F 42 DVDD 41 40 39 38 CLK DATA LATCH DGND 36 8 volume 9 34 33 Cin 11 volume 32 31 13 volume 30 29 28 27 26 35 SW out SRout SLout Cout Rout Lout AVSS CL1 CL2 CR1 CR2 SRin SLin Rin Lin BYPASSR BYPASSL 15 16 17 volume AVDD 5 tone tone Page 4 MAY.2003 SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER SM7346A ABSOLUTE MAXIMUM RATINGS Symbol Vsupply Pd Kθ Topr Tstg Parameter Supply Voltage Power dissipation Thermal derating Operating temperature Storage temperature Conditions AVDD-AVSS Ta25oC *standard board Ratings 16.0 1000 10 -20~+75 -40~+125 Unit V mW mW / oC oC oC THERMAL DERATING (MAXIMUM RATING) Standard board 1.5 POWER DISSIPATION pd[W] 1.0 0.5 * Standard board •board size :70mm X 70mm •board thickness :1.6mm •board material :glass epoxy •copper pattern : •copper thickness:18um •copper size :0.25mm(wide) 30mm(length/lead) 0 25 50 75 100 125 150 AMBIENT TEMPERATURE Ta [℃] Page 5 MAY.2003 SAMHOP Microelectronics Corp. 6 CHANNELS VOLUME CONTROLLER SM7346A RECOMMENDED OPERATING CONDITION Parameter Analog positive Supply Voltage Analog negative Supply Voltage Digital Supply Voltage High-level Input Voltage Low-level Input Voltage Symbol AVDD AVSS DVDD VIH VIL Condition Min. 6.0 - 8.0 4.5 DVDDX0.7 DGND Typ. 7.0 - 7.0 5.0 － Max. 8.0 - 6.0 5.5 DVDD DVDDX0.3 　 Unit V V V V V － Note1 : AVSS