Obsolete Product(s) - Obsolete Product(s)

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1 TDA7432 BASIC FUNCTION AUDIO PROCESSOR ONE STEREO AND ONE MONO INPUTS MUTE FUNCTION (SOFTWARE AND HARD- WARE) CONTROLLED VOLUME CONTROL IN db STEP BASS AND TREBLE CONTROL IN 2dB STEP FULLY PROGRAMMABLE LOUDNESS CON- TROL FOUR SPEAKER ENUATORS: Independent attenuation control Independent mute function ALL FUNCTIONS PROGRAMMABLE VIA I 2 CBUS BLOCK DIAGRAM IN_L MONO_IN/MUTE 3 4 MU 68nF LOUD_L 6 VOL + LOUD nf BINL 4.7K BASS S BUS DECODER + LATCHES DESCRIPTION The TDA7432 is a volume, tone (bass and treble) balance (Left/Right) processor for quality audio applications in car radio and Hi-Fi systems. Control is accomplished by serial bus microprocessor interface. The AC signal setting is obtained by resistor networks and switches combined with operational amplifiers. Thanks to the advanced BIPOLAR/CMOS Technology, the external components have been reduced. nf BOUTL 9 TREBLE 2.7nF TRL SO2 ORDERING NUMBER: TDA7432D LEFT FRONT LEFT REAR SCL SDA IN_R 2 MU VOL + LOUD BASS TREBLE 5 RIGHT FRONT VS 7 SUPPLY 3 RIGHT REAR GND CREF LOUD_R BINR BOUTR TRR D95AU357A µf 68nF 2.7nF nf nf 4.7K September 23 /

2 ABSOLUTE MAIMUM RATINGS Symbol Parameter Value Unit V S Operating Supply Voltage.2 V T amb Operating Temperature Range -4 to 85 C T stg Storage Temperature Range -55 to +5 C QUICK REFERENCE DATA Symbol Parameter Min. Typ. Max. Unit V S Supply Voltage V V CL Max. Input Signal Handling.3.6 Vrms THD Total Harmonic Distortion (V = Vrms f = khz).5 % S/N Signal to Noise Ratio 2 db Sc Channel Separation f = khz db PIN CONNECTION (Top View) Volume Control db step db Bass Control 2dB step db Treble Control 2dB step db Speaker Attenuators db Mute Attenuation db CREF IN_R IN_L MONO_IN/MUTE LOUD_R LOUD_L BOUT_R BIN_R BOUT_L BIN_L D95AU358 2 GND SDA SCL V S OUT_LF OUT_RF OUT_LR OUT_RR TRR TRL THERMAL DATA Symbol Parameter Value Unit R th j-pins Thermal Resistance Junction-pins Max. 5 C/W 2/

3 APPLICATION CIRCUIT 68nF nf 4.7K nf 2.7nF V S 9V nf 6 9 IN_L 3 VOL MU BASS TREBLE + LOUD MONO_IN /MUTE IN_R V S GND 4.7µF MU SUPPLY LOUD_L BINL BOUTL TRL CREF 68nF VOL + LOUD 5 S BUS DECODER + LATCHES LOUD_R 8 nf BASS BINR 4.7K 7 BOUTR nf TREBLE 2 TRR 2.7nF D95AU359B LEFT FRONT LEFT REAR SCL SDA RIGHT FRONT RIGHT REAR 3/

4 ELECTRICAL CHARACTERISTICS (Tamb = 25 C, VS = 9V, RL = kω, Rg = 5Ω, all variable gains = db, f = khz, unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit INPUT SELECTOR R IN Input Resistance 7 3 kω V CL Clipping Level d.3%.3.6 Vrms S IN Input Separation 7 db A MUTE Input Mute Attenuation 7 95 db V DC Mute DC Step.2 mv MUTE AT AM INPUT (*) V IL Input Low Voltage AM not selected.4 V VOLUME CONTROL G MA Max. Gain Note db A MA Max Attenuation db A step Step Resolution.5.5 db E A Attenuation Set Error G = +2 to -2dB - + db G = -2 to -6dB -2 2 db E T Tracking Error G = -2 to -6dB 2 db V DC DC Steps Adjacent Attenuation Steps,. 4 mv Range from to -79dB From db to -79dB.5 mv LOUDNESS CONTROL A MA Control Range db A step Step Resolution.5.5 db R LOUD Internal Resistor kω BASS CONTROL B RANGE Max. Bass boost db B CUT Max. Bass cut db A Step Step Resolution 2 3 db R B Internal Feedback Resistance kω TREBLE CONTROL C RANGE Control Range ±3 ±4 ±5 db A step Step Resolution 2 3 db SPEAKER ENUATORS C RANGE Control Range db A step Step Resolution From to -24dB.5.5 db A MUTE Output Mute Attenuation 7 9 db E A Attenuation Set Error From to -24dB db V DC DC Steps Adjacent Attenuation Steps. 4 mv AUDIO OUTPUTS V CLIP Clipping Level d =.3% Vrms G OUT Output Gain (fixed) 4 db R L Output Load Resistance AC - connected 3 kω DC connected to GND 5 C L Output Load Capacitance nf R OUT Output Impedance 3 Ω VDC DC Voltage Level V (*) The mute function can be activated without using the I2C bus by grounding the AM input when AM is not selected. This causes the input multiplexer to select the reference voltage instead of an input signal. 4/

5 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit GENERAL V S Supply Voltage V I S Supply Current 5 8 ma PSRR Power Supply Rejection Ratio 65 8 db e NO Output Noise 2Hz - 2kHz "A" - weighted BW = 2Hz - 2kHz, flat output muted S/N Signal to Noise Ratio all gains = db; V O = Vrms 3 db d Distortion V OUT = Vrms.5.5 % Sc Channel Separation 7 8 db E T Total Tracking Error A V = to -2dB A V = -2 to -6dB 2 db db BUS INPUTS V IL Input Low Voltage V V IH Input High Voltage 3 V I IN Input Current V IN =.4V µa V O Output Voltage SDA Acknowledge I O =.6mA.5.4 V SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: a start condition (S) a chip address byte (the bit determines read / write transmission) a subaddress byte a sequence of data (N-bytes + acknowledge) a stop condition (P) CHIP ADDRESS SUBADDRESS S R/W ACK I A 3 A 2 A A ACK DATA ACK P ACK = Acknowledge S = Start P = Stop MA CLOCK SPEED 5kbits/s DATA...DATA n 2 µv µv µv Auto Increment If bit I in the subaddress byte is set to "", the autoincrement of the subaddress is enabled. 5/

6 SUBADDRESS (receive mode) I A3 A2 A A Input selector Volume Bass, Treble Speaker attenuator LF Speaker attenuator LR Speaker attenuator RF Speaker attenuator RR Loudness FUNCTION I = Auto increment = Not used DATA BYTE SPECIFICATION = not relevant; set to "" during testing Input Selector D 7 D 6 D 5 D 4 D 3 D 2 D D FUNCTION IN not used mono no input selected mute (low homic) non-symmetrical bass cut (note ) symmetrical bass cut extended bass range standard bass range ±4dB For example to select the MONO input the Data Byte is:. An additional direct mute function is included in the Speaker Attenuators. Note : Bass cut for very low frequencies. D 7 (*) D 6 D 5 D 4 D 3 D 2 D D (*) Loudness = ON +32dB +6dB db -6dB -32dB -48dB -64dB db -db -2dB -5dB VOLUME Note 2: It is not recommended to use a gain more than 2dB for system performance reason. In general, the max. gain should be limited by software to the maximum value, which is needed for the system. 6/

7 Bass, Treble D4 Input Selector D 7 D 6 D 5 D 4 D 3 D 2 D D Treble Steps - 4dB -2dB -db -8dB -6dB -4dB -2dB db db +2dB +4dB +6dB +8dB +db +2dB +4dB Bass Steps -8dB -6dB -4dB -2dB -db -8dB -6dB -4dB -2dB normal db range db ±4dB +2dB +4dB +6dB +8dB +db +2dB +4dB +6dB +8dB FUNCTION For example 2dB Treble and -8dB Bass give the following DATA BYTE: Speaker Attenuators D 7 D 6 D 5 D 4 D 3 D 2 D D : db -db : -24dB -25.5dB -27dB -28.5dB -3dB -32dB -34.5dB -37.5dB SPEAKER ENUATOR LF, LR, RF, RR Speaker Mute 7/

8 Loudness D 7 D 6 D 5 D 4 D 3 D 2 D D D3 D2 D D db -db -2dB : -3dB -4dB -5dB -6dB -7dB -8dB -9dB -db -db -2dB -3dB -4dB -5dB Loudness flat (Note 3) For example to select -4dB Loudness the Data Byte is :. LOUDNESS Note3: Fiat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to "". In this case the attenuation is db independent from the loudness settings. Functional Description The input selector is able to select stereo inputs and mono input (AM). The inputs are DC biased with kω resistors to the internal reference voltage of 3V. The AM input can be use additionally as hardware mute pin. If this pin is pulled to ground by an external transistor and AM is not selected, the input selector mutes the input (reference voltage selected). The AM part is considered to be switched OFF. If the output of the AM part is not high ohmic in this condition, a series resistor of about 2kΩ has to be foreseen. The volume control can be programmed from a gain of +32dB to an attenuation of -79dB in db steps. The maximum gain should be kept as low as possible for system performance reason. It has to be limited by software to the absolute necessary system gain, depending on the signal source level and the power amplifier gain. The bass control acts in a range from +8dB to - 8dB in 2dB steps. The filter response is determined by the external filter components. An extensive simulation software is available in order to support the design of the bass filter response with different filter configurations. The extended bass boost range of +8dB allows the implementation of the software loudness function by additional bass and treble boost. The treble control acts in a range of ±4dB in 2dB steps. The external capacitor determines with the internal resistor of 5KΩ the corner frequency of the treble response. The four speaker attenuators can be controlled independently from to -37.5dB, which allows the implementation of balance and fader a the four speaker system. The attenuation steps size is db from to -24dB and increases nonlinearly up to the maximum attenuation of 37.5dB. A special mute bit forces the speaker attenuator into the mute position. All 4 outputs are low distortion push pull outputs, able to drive a load of 3kΩ. 8/

9 DIM. mm inch MIN. TYP. MA. MIN. TYP. MA. OUTLINE AND MECHANICAL DATA A A B C D E e.27.5 H h L K B (min.)8 (max.) A e K D L SO2 h x 45 H A C 2 E SO2MEC 9/

10 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners 23 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia Belgium - Brazil - Canada - China Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States /

Obsolete Product(s) - Obsolete Product(s)

Obsolete Product(s) - Obsolete Product(s) TDA7433 BASIC FUNCTION AUDIO PROCESSOR TWO STEREO AND ONE MONO INPUTS CONTROLLED MUTE FUNCTION (SOFTWARE AND HARD- WARE) VOLUME CONTROL IN db STEP FOUR SPEAKER ENUATORS: Independent attenuation control