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TDA7434
BASIC FUNCTION AUDIO PROCESSOR
TWO STEREO AND ONE MONO INPUTS MUTE FUNCTION (SOFTWARE AND HARDWARE) CONTROLLED VOLUME CONTROL IN 1dB STEP BASS AND TREBLE CONTROL FOUR SPEAKER ATTENUATORS: - Independentattenuation control - Independentmute function ALL FUNCTIONS PROGRAMMABLE VIA I2CBUS FULLY PROGRAMMABLE LOUDNESS CONTROL DESCRIPTION The TDA7434 is a volume, tone (bass and treble) balance (Left / Right) fader (Front / Rear) processor for quality audio applications in car radio and Hi-Fi systems. Control is accomplished by serial bus microprocessor interface. BLOCK DIAGRAM
4.7K 100nF LOUD_L 7 6 2 MUX VOL BASS TREBLE BIN_L 12 100nF BOUT_L 11
SDIP24 ORDERING NUMBER: TDA7434
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.
2.7nF
TRL 13 SPKR ATT SPKR ATT 19
LEFT FRONT
IN1_L IN2_L
17
LEFT REAR
MONO/MUTE
4
21 S BUS DECODER + LATCHES 22
SCL SDA
IN2_R IN1_R VS
1 5 20
MUX
VOL
BASS
TREBLE
SPKR ATT SPKR ATT
18
RIGHT FRONT
16
SUPPLY 24 GND CREF 8 LOUD_R 100nF 10 BIN_R 9 BOUT_R 100nF 4.7K 14 TRR 2.7nF
RIGHT REAR
23
D95AU360A
August 1996
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This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA7434
ABSOLUTE MAXIMUM RATINGS
Symbol VS Tamb Tstg Operating Supply Voltage Operating Temperature Range Storage Temperature Range Parameter Value 10.2 -40 to 85 -55 to +150 Unit V C C
QUICK REFERENCE DATA
Symbol VS VCL THD S/N Sc Supply Voltage Max. Input Signal Handling Total Harmonic Distortion (V = 1Vrms f = 1kHZ) Signal to Noise Ratio Channel Separation f = 1kHz Volume Control 1dB step Bass Control 2dB step Treble Control 2dB step Speaker Attenuators Mute Attenuation -79 -18 -14 -37.5 100 Parameter Min. 7 1.3 Typ. 9 1.6 0.05 102 100 +32 +18 +14 0 Max. 10.2 Unit V Vrms % dB dB dB dB dB dB dB
PIN CONNECTION (Top View)
IN2_R IN2_L N.C. MONO/MUTE IN1_R IN1_L LOUD_L LOUD_R BOUT_R BIN_R BOUT_L BIN_L
1 2 3 4 5 6 7 8 9 10 11 12
D95AU361
24 23 22 21 20 19 18 17 16 15 14 13
CREF GND SDA SCL VS OUT_LF OUT_RF OUT_LR OUT_RR N.C. TRR TRL
THERMAL DATA
Symbol Rth j-pins Parameter Thermal Resistance Junction-pins Max. Value 65 Unit C/W
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TDA7434
APPLICATION CIRCUIT
68nF
4.7K 100nF 100nF BOUT_L 11
2.7nF
LOUD_L 7 100nF IN1_L IN2_L 100nF 100nF MONO/ MUTE 100nF IN2_R IN1_R 100nF 100nF VS 1 5 20 MUX VOL 6 2
BIN_L 12
TRL 13 SPKR ATT SPKR ATT 19
LEFT FRONT
MUX
17
VOL
BASS
TREBLE
LEFT REAR
4
21 S BUS DECODER + LATCHES 22
SCL SDA
BASS
TREBLE
SPKR ATT SPKR ATT
18
RIGHT FRONT
16
VS 9V
SUPPLY 24 GND 10F CREF 68nF 8 LOUD_R 100nF 10 BIN_R 9 BOUT_R 100nF 4.7K 14 TRR 2.7nF
RIGHT REAR
23
D95AU362A
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TDA7434
ELECTRICAL CHARACTERISTICS (Tamb = 25C, VS = 9V, RL = 10k, Rg = 50, all variable gains = 0dB, f = 1kHz, unless otherwise specified.)
Symbol INPUT SELECTOR R IN VCL SIN AMUTE Input Resistance Clipping Level Input Separation Input Mute Attenuation d 0.3% 70 1.3 70 70 100 1.6 90 95 0.2 AM not selected Note 2 30.5 75 0.5 G = +20 to -20dB G = -20 to -60dB ET VDC Tracking Error DC Steps G = +20 to -60dB Adjacent Attenuation Steps, Range from 0 to -79dB From 0dB to -79dB LOUDNESS CONTROL AMAX Astep RLOUD BRANGE BCUT AStep RB C RANGE Astep C RANGE Astep AMUTE EA VDC VCLIP GOUT RL CL ROUT VDC Control Range Step Resolution Internal Resistor Max. Bass boost Max. Bass cut Step Resolution Internal Feedback Resistance Control Range Step Resolution Control Range Step Resolution Output Mute Attenuation Attenuation Set Error DC Steps Clipping Level Output Gain (fixed) Output Load Resistance Output Load Capacitance Output Impedance DC Voltage Level 3.7 30 4.0 AC - connected DC connected to GND From 0 to -24dB Adjacent Attenuation Steps d = 0.3% 2 3.5 3 5 10 100 4.3 nF V 0.1 2.5 4 4.5 From 0 to -24dB 14 0.5 37 15.5 -20 1 48 13 1 36 0.5 70 15 1 50 +18 -18 2 65 14 2 37.5 1 90 1 4 16 1.5 63 20 -15.5 3 82 15 3 39 1.5 dB dB k dB dB dB k dB dB dB dB dB dB mV Vrms dB k 0.1 0.5 -1 -2 32 79 1 0 10 0.4 33.5 83 1.5 +1 2 2 4 10 130 k Vrms dB dB mV V dB dB dB dB dB dB mV mV Parameter Test Condition Min. Typ. Max. Unit
Mute DC Step VDC MUTE AT AM INPUT (*) V IL GMAX AMAX Astep EA Input Low Voltage Max. Gain Max Attenuation Step Resolution Attenuation Set Error VOLUME CONTROL
BASS CONTROL
TREBLE CONTROL
SPEAKER ATTENUATORS
AUDIO OUTPUTS
(*) 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.
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TDA7434
ELECTRICAL CHARACTERISTICS (continued)
Symbol GENERAL VS IS PSRR e NO Supply Voltage Supply Current Power Supply Rejection Ratio Output Noise 20Hz - 20kHz "A" - weighted BW = 200Hz - 20kHz, flat output muted all gains = 0dB; VO = 1Vrms VOUT = 1Vrms 70 AV = 0 to -20dB AV = -20 to -60dB 6 5 65 9 8 85 4 7.0 5.5 103 0.04 80 0 0 1 2 1 3 VIN = 0.4V IO = 1.6mA -5 0.15 +5 0.40 0.15 20 10.2 11 V mA dB V V V dB % dB dB dB V V A V Parameter Test Condition Min. Typ. Max. Unit
S/N d Sc ET BUS INPUTS V IL VIH IIN VO
Signal to Noise Ratio Distortion Channel Separation Total Tracking Error
Input Low Voltage Input High Voltage Input Current Output Voltage SDA Acknowledge
SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: - a start condition (S) - a chip address byte (the LSB bit determines read / write transmission) - a subaddress byte - a sequence of data (N-bytes + acknowledge) - a stop condition (P)
CHIP ADDRESS SUBADDRESS DATA 1...DATA n
MSB
LSB
MSB
LSB
MSB
LSB
S
1
0
0
0
1
0
1
R/W ACK X
X
X
I A3 A2 A1 A0 ACK
DATA
ACK P
ACK = Acknowledge S = Start P = Stop MAX CLOCK SPEED 500kbits/s Auto Increment If bit I in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled.
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TDA7434
SUBADDRESS (receive mode)
MSB X X X I A3 0 0 0 0 0 0 0 0 A2 0 0 0 0 1 1 1 1 A1 0 0 1 1 0 0 1 1 LSB A0 0 1 0 1 0 1 0 1 FUNCTION Input selector Volume Bass, Treble Speaker attenuator LF Speaker attenuator LR Speaker attenuator RF Speaker attenuator RR Loudness
I = Auto increment X = Not used DATA BYTE SPECIFICATION X = not relevant; set to "1" during testing Input Selector
MSB D7 D6 D5 D4 D3 D2 0 0 0 0 1 0 1 0 1 D1 0 0 1 1 X LSB D0 0 1 0 1 X FUNCTION IN 2 IN 1 mono no input selected mute (low homic) non-symmetrical bass cut (note 1) symmetrical bass cut extended bass range standard bass range 14dB
For example to select the MONO input the Data Byte is: X X X X X 0 1 0. An additional direct mute function is included in the Speaker Attenuators. Note 1: Bass cut for very low frequencies.
MSB D7(*) 1 1 1 1 1 1 1 1 1 1 1 1 D6 0 0 0 0 1 1 1 D5 0 0 1 1 0 0 1 D4 0 1 0 1 0 1 0 0 0 0 1 0 0 0 1 0 0 1 1 D3 D2 D1
LSB D0 +32dB +16dB 0dB -16dB -32dB -48dB -64dB 0 1 0 1 0dB -1dB -2dB -15dB
VOLUME
(*) Loudness = ON
Note 2: It is not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by software to the maximum value, which is needed for the system.
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TDA7434
Bass, Treble
MSB D7 D6 D5 D4 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 0 0 1 0 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0 0 1 D2 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 D1 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 LSB D0 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0 Treble Steps - 14dB -12dB -10dB -8dB -6dB -4dB -2dB 0dB 0dB +2dB +4dB +6dB +8dB +10dB +12dB +14dB Bass Steps -18dB -16dB -14dB -12dB -10dB -8dB -6dB -4dB -2dB normal 0dB range 0dB 14dB +2dB +4dB +6dB +8dB +10dB +12dB +14dB +16dB +18dB FUNCTION
D4 Input Selector 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0
For example 12dB Treble and -8dB Bass give the following DATA BYTE: 0 0 1 1 1 0 0 1 Speaker Attenuators
MSB D7 X X X X X X X X X X X D6 X X X X X X X X X X X D5 0 0 0 0 0 0 0 0 0 0 1 D4 0 0 : 1 1 1 1 1 1 1 1 X D3 0 0 1 1 1 1 1 1 1 1 X D2 0 0 0 0 0 0 1 1 1 1 X D1 0 0 0 0 1 1 0 1 1 1 X LSB D0 0 1 0 1 0 1 0 1 0 1 X SPEAKER ATTENUATOR LF, LR, RF, RR 0dB -1dB : -24dB -25.5dB -27dB -28.5dB -30dB -32dB -34.5dB -37.5dB Speaker Mute
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TDA7434
Loudness
MSB D7 X X X X X X X X X X X X X X X X X D6 X X X X X X X X X X X X X X X X X D5 X X X X X X X X X X X X X X X X X D4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D3 D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D2 D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D1 LSB D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 D0 LOUDNESS 0dB -1dB -2dB : -3dB -4dB -5dB -6dB -7dB -8dB -9dB -10dB -11dB -12dB -13dB -14dB -15dB Loudness flat (Note 3)
For example to select -14dB Loudness the Data Byte is : X X X 0 1 1 1 0.
Note 3: FIat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to "0". In this case the attenuation is 0dB independent from the loudness settings.
Functional Description The input selector is able to select 2 stereo inputs and 1 mono input (AM). The inputs are DC biased with a 100k resistors to the internal reference voltage of 3V. The AM input can be used additionally as hardware mute pin. If this pin is pulled to ground by an external transistors 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 20k has to be foreseen. The volume control can be programmed from a gain of +32dB to an attenuation of -79dB in 1dB 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 +18dB to 18dB in 2dB steps. The filter response is deter-
mined 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 +18dB allows the implementation of the software loudness function by additional bass and treble boost. The treble control acts in a range of 14dB in 2dB steps. The external capacitor determines with the internal resistor of 50K the corner frequency of the treble response. The four speaker attenuators can be controlled independently from 0 to -37.5dB, which allows the implementation of balance and fader for a four speaker system. The attenuation steps size is 1 db from 0 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 3k.
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TDA7434
SDIP24 PACKAGE MECHANICAL DATA
DIM. MIN. A A1 A2 B B1 c D E E1 e e1 e2 e3 L 2.54 3.30 0.51 3.05 0.36 0.76 0.23 22.61 7.62 6.10 6.40 1.778 7.62 10.92 1.52 3.81 0.10 0.130 3.30 0.46 1.02 0.25 22.86 4.57 0.56 1.14 0.38 23.11 8.64 6.86 mm TYP. MAX. 5.08 0.020 0.120 0.0142 0.030 0.0090 0.890 0.30 0.240 0.252 0.070 0.30 0.430 0.060 0.150 0.90 0.130 0.0181 0.040 0.180 0.0220 0.045 0.0098 0.0150 0.910 0.340 0.270 MIN. inch TYP. MAX. 0.20
E E1
A1
A2
Stand-off B B1 e e1 e2
L c D E 24 13 F
.015 0,38 Gage Plan e
1
12 e3
SDIP24
A
e2
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TDA7434
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Micr oelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1995 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - United Kingdom - U.S.A.
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