TDA7468 TWO BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR WITH BASS ALC SURROUND 1 FEATURES Figure 1. Package INPUT MULTIPLEXER 4 STEREO INPUTS SELECTABLE INPUT GAIN FOR OPTIMAL SO28 ADAPTATION TO DIFFERENT SOURCES ONE STEREO OUTPUT Table 1. Order Codes BASS ALC TREBLE AND BASS CONTROL IN 2.0dB Part Number Package STEPS TDA7468D SO28 VOLUME CONTROL IN 1.0dB STEPS TDA7468D13TR Tape & Reel TWO SPEAKER ATTENUATORS: TWO INDEPENDENT SPEAKER CONTROL IN 1.0dB STEPS FOR BALANCE FACILITY applications in Hi-Fi systems. INDEPENDENT MUTE FUNCTION Selectable input gain is provided. Control of all the functions is accomplished by serial bus. ALL FUNCTION ARE PROGRAMMABLE VIA SERIAL BUS The AC signal setting is obtained by resistor net- EXTERNALLY ADJUSTABLE SURROUND works and switches combined with operational amplifiers. 2 DESCRIPTION Thanks to the used BIPOLAR/CMOS Technology, Low Distortion, Low Noise and DC stepping are The TDA7468D is a volume tone (bass and treble) obtained balance (Left/Right) processor for quality audio Figure 2. PIN CONNECTION (Top view) V 1 28 GND S MIC 2 27 CREF IN1 L 3 26 IN1 R IN2 L 4 25 IN2 R IN3 L 5 24 IN3 R IN4 L 6 23 IN4 R MUX L 7 22 MUX R IS L 8 21 IS R TREBLE L 9 20 TREBLE R BASSI L 10 19 BASSI R BASSO L 11 18 BASSO R OUT L 12 17 OUT R DGND 13 16 ALC SCL 14 15 SDA D99AU1057 Rev. 4 April 2010 1/23TDA7468 Figure 3. BLOCK DIAGRAM 2/23 MUX-R IS-R TREBLE-R BASSI-R BASSO-R 23 22 21 20 19 18 IN-R4 50K 50K gm INPUT buffer gain: 63dB att. 24 SELECT 0 to 14dB gain /1dB step non-inverting -14 to +14dB -14 to +14dB -24 att. IN-R3 / 2dB step + 6dB gain inverting /2dB step /2dB step /8dB step 50K 17 + TREBLE BASS OUT-R VARIABLE 25 0dB MIX IN-R2 6dB 9dB 12dB 50K + 26 IN-R1 50K BASS ALC CONTROL 2 MIC-MIX 14 SCL 2 0dB, 6dB I C BUS DECODER + LATCHES 15 50K 10dB, 14dB SDA 13 DGND 16 HALF WAVE ALC + RECTIFIER 3 IN-L1 50K INPUT buffer gain: 4 SELECT 0 to 14dB gain IN-L2 non-inverting / 2dB step inverting 50K 12 + + TREBLE BASS OUT-L VARIABLE 5 0dB MIX IN-L3 6dB 63dB att. -14 to +14dB -14 to +14dB -24 att. /1dB step /2dB step /2dB step /8dB step 9dB 12dB + 6dB gain 50K 1 6 SUPPLY V S gm IN-L4 V REF 50K 50K 78 9 10 11 28 27 D99AU1058A MUX-L IS-L TREBLE-L BASSI-L BASSO-L GND CREF