7403

® TDA7403 BASIC SIGNAL PROCESSOR PRELIMINARY DATA DEVICE INCLUDES AUDIO PROCESSOR, STEREO DECODER AND NOISEBLANKER HIGH PERFORMANCE SIGNAL PROCESSOR WITH BASIC FUNCTIONS AM, FM, MPX AND CASSETTE INPUTS NO EXTERNAL COMPONENTS REQUIRED FULLY PROGRAMMABLE VIA I2C BUS LOW DISTORTION AND NOISE SO20 DESCRIPTION The TDA7403 is a high performance signal processor specifically designed for car radio applications focused on the low-end market. The device includes a complete audioprocessor and a stereo decoder with noiseblanker. Switched-capacitors design technique allows to obtain all these features without external components or adjustments. Using TDA7403 results is in a very performant low-cost signal processing BLOCK DIAGRAM SM ORDERING NUMBER: TDA7403D application The device is fully programmable by I2C bus interface allowing to customize key device parameters and especially filter characteristics. The BICMOS process combined with the optimized signal processing assure low noise and low distortion performances. 11 8 SOFT MUTE OUT LR TREBLE BASS OUT LF OUT RR OUT RF 17 19 16 18 OUT LR OUT LF OUT RR OUT RF AM VOLUME CASS R CASS L 1 2 INPUT MULTIPLEXER + AUTO ZERO 12 DIGITAL CONTROL I2C BUS 13 SCL SDA FM R FM L 9 MPX 80KHz LP PILOT CANCELLATION DEMODULATOR + STEREO ADJUST + STEREO BLEND 25KHz LP S&H HIGH CUT CONTROL 15 VS SUPPLY PLL PIL DET D NOISE BLANKER PULSE FORMER A 10 LEVEL D98AU918 14 GND 20 CREF October 1998 1/26 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TDA7403 ABSOLUTE MAXIMUM RATINGS Symbol VS Tamb Tstg Operating Supply Voltage Operating Ambient Temperature Range Operating Storage Temperature Range Parameter Value 10.5 -40 to 80 -55 to 150 Unit V °C °C SUPPLY Symbol VS IS SVRR Parameter Supply Voltage Supply Current Ripple Rejection @ 1KHz VS = 9V Audioprocessor (all filters flat) Stereodecoder + Audioprocessor Test Condition Min. 7.5 25 Typ. 9 30 60 55 Max. 10 35 Unit V mA dB dB ESD All pins are protected against ESD according to the MIL883 standard. PIN CONNECTION CASS R CASS L N.C. N.C. N.C. N.C. N.C. AM MPX LEVEL 1 2 3 4 5 6 7 8 9 10 D98AU919 20 19 18 17 16 15 14 13 12 11 CREF OUT LF OUT RF OUT LR OUT RR VS GND SDA SCL SM THERMAL DATA Symbol Rth-j pins Parameter Thermal Resistance Junction-pins Max Value 85 Unit °C/W 2/26 TDA7403 PIN DESCRIPTION N. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name CASSR CASSL n.c. n.c. n.c. n.c. n.c. AM MPX LEVEL SM SCL SDA GND VS OUTRR OUTLR OUTRF OUTLF CREF Cassette Input Right Cassette Input Left not connected not connected not connected not connected not connected AM Input FM Input (MPX) Level Input Stereodecoder Soft Mute Drive I C Clock Line I C Data Line Supply Ground Supply Voltage Right Rear Speaker Output Left Rear Speaker Output Right Front Spaeaker Output Left Front Speaker Output Reference Capacitor Pin 2 2 Function Type I I I I I I I/O I/O S S O O O O S (1) See input configuration tree and databyte specification ”configuration” Pin type legenda: I = Input O = Output I/O = Input/Output S = Supply 3/26 TDA7403 AUDIO PROCESSOR PART Input Multiplexer MPX input Cassette stereo input AM mono or stereo input Internal beep with 2 frequencies (selectable) Mixable phone and beep signals Loudness First or second order frequency response Programmable center frequency and quality factor 15 x 1dB steps Selectable flat-mode (constant attenuation) Volume control 1dB attenuator Max. gain 20dB Max. attenuation 79dB Soft-step gain control Bass Control 2nd order frequency response Center frequency programmable in 4(5) steps DC gain programmable 7 x 2dB steps Treble Control 2nd order frequency response Center frequency programmable in 4 steps 7 x 2dB steps Speaker Control 4 independentspeaker controls (1dB steps control range 50dB) Mute Functions Direct mute driven by pin SM Digitally controlled softmute with 4 programmable time constants ELECTRICAL CHARACTERISTICS (VS = 9V; Tamb = 25°C; RL = 10KΩ; all gains = 0dB; f = 1KHz; unless otherwise specified). Symbol Parameter Test Condition Min. Typ. Max. Unit KΩ VRMS dB 1 dB dB dB mV mV INPUT SELECTOR R in VCL SIN GIN MIN GIN MAX GSTEP VDC Input Resistance Clipping Level Input Separation Min. Input Gain Max. Input Gain Step Resolution DC Steps Adjacent Gain Step GMIN to GMAX all inputs except Phone 70 2.2 80 -1 100 2.6 100 0 14 2 0 1 130 BEEP CONTROL VRMS fBMIN fBMAX Beep Level Lower Beep Frequency Higher Beep Frequency 350 600 1.2 mV Hz KHz MIXING CONTROL MLEVEL Mixing Level Source Source Source Beep/Phone 0 -6 -12 0 dB dB dB dB 4/26 TDA7403 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit VOLUME CONTROL GMAX AMAX ASTEP EA ET VDC Max Gain Max Attenuation Step Resolution Attenuation Set Error Tracking Error DC Steps Adjacent Attenuation Steps From 0dB to GMIN 0.1 0.5 G = -20 to 20dB G = -60 to 20dB -1.25 -4 20 79 1 0 0 1.25 3 2 3 5 dB dB dB dB dB dB mV mV LOUDNESS CONTROL ASTEP AMAX fCMIN fCMAX Step Resolution Max. Attenuation Lower Center Frequency Higher Center Frequency 1 15 200 400 dB dB Hz Hz SOFT MUTE AMUTE TD Mute Attenuation Delay Time T1 T2 T3 T4 VTHlow VTHhigh R PU VPU Low Threshold for SM Pin (1) High Threshold for SM Pin Internal Pull-up Resistor Pull-up Voltage 2.5 70 100 4.7 130 70 100 0.48 0.96 40.4 324 1 dB ms ms ms ms V V KΩ V SOFT STEP TSW Switch Time 10 ±14 2 fC1 fC2 fC3 fC4 QBASS Quality Factor Q1 Q2 Q3 Q4 DC GAIN Bass-Dc-Gain DC = off DC = on 1) SM pin is active low (mute condition) 2) See description of Audioprocessor Part - Bass & Treble filter characteristics programming ms BASS CONTROL C RANGE ASTEP fC Control Range Step Resolution Center Frequency dB dB Hz Hz Hz Hz 60 70 80 100 1 1.25 1.5 2 0 4.4 (2) dB dB 5/26 TDA7403 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Control Range Step Resolution Center Frequency Test Condition Min. Typ. ±14 2 10 12.5 15 17.5 50 1 90 0.1 2.2 2 2.6 10 120 2 5 Max. Unit dB dB KHz KHz KHz KHz dB dB dB dB mV VRMS KΩ nF Ω V µV µV dB dB % % dB dB dB TREBLE CONTROL C RANGE ASTEP fC fC1 fC2 fC3 fC4 SPEAKER ATTENUATORS C RANGE ASTEP AMUTE EE VDC VCLIP RL CL ROUT VDC Control Range Step Resolution Output Mute Attenuation Attenuation Set Error DC Steps Clipping Level Output Load Resistance Output Load Capacitance Output Impedance DC Voltage Level Output Noise 80 Adjacent Attenuation Steps d = 0.3% AUDIO OUTPUTS 30 3.8 BW = 20 Hz to 20 KHz output muted BW = 20 Hz to 20 KHz all gain = 0dB all gain = 0dB flat; VO = 2VRMS bass treble at 12dB; VO = 2.6VRMS VIN = 1VRMS; all stages 0dB VIN = 1VRMS; Bass & Treble = 12dB 80 AV = 0 to -20dB AV = -20 to -60dB 3 6.5 110 100 0.002 0.05 100 0 0 GENERAL e NO S/N Signal to Noise Ratio d SC ET Distortion Channel separation Left/Right Total Tracking Error 1 2 6/26 TDA7403 DESCRIPTION OF THE AUDIOPROCESSOR Figure 1. Input stages CASSETTE 100K IN GAIN AM 100K STEREODECODER 100K D98AU951 MPX I nput stages The input circuits are the same as in preceeding ST audioprocessors with exception of the CD inputs (see figure 1). The typical input impedance is 100kΩ. AutoZero In order to reduce the number of pins there is no AC coupling between the In-Gain and the following stage, so that any offset generated by or before the In-Gain stage would be transferred or even amplified to the output. To avoid that effect a special offset cancellation stage called AutoZero is implemented. To avoid audible clicks the audioprocessor is muted before the loudness stage during this time. In some cases, for example if the µP is executing a refresh cycle of the I2C bus programming, it is not useful to start a new AutoZero action because no new source is selected and an undesired mute would appear at the outputs. For such applications the TDA7403 could be switched in the ”Auto Zero Remain” mode (Bit 6 of the subaddress byte). If this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and the old adjustment value remains. Mixing Stage This stage offers the possibility to mix the internal beep or the phone signal to any other source. Due to the fact that the mixing stage is also located behind the In-Gain stage fine adjustments of the main source level can be done in this way. Loudness There are four parameters programmable in the loudness stage (see fig. 2, 3, 4): Figure 2. Loudness Attenuation @ fc = 400Hz (second order) 0.0 -5.0 -10.0 -15.0 -20.0 10.0 100.0 1.0K 10.0K Figure 3. Loudness Center frequency @ Attn. = 15dB (second order) 0.0 -5.0 -10.0 -15.0 -20.0 10.0 100.0 1.0K 10.0K - Attenuation - Center Frequency - Loudness Q - Flat Mode: in this mode the loudness stage works as a 0 - 15dB attenuator. 7/26 TDA7403 Figure 4. Loudness @ Attn. = 15dB, fc = 400Hz (dB) D98AU844 Figure 5. Softmute Timing EXT. MUTE 1 -5 +SIGNAL -10 REF -15 -SIGNAL 1 -20 10 I C BUS OUT 2 100 1,000 Hz D97AU634 Time Softmute The digitally controlled softmute stage allows muting/demuting the signal with a I2C bus programmable slope. The mute process can either be activated by the softmute pin or by the I2C bus. The slope is realized in a special S shaped curve to mute slow in the critical regions (see figure 5). For timing purposes the Bit 3 of the I2C bus output register is set to 1 from the start of muting until the end of demuting. Softstep Volume When volume level is changed often an audible click appears at the output. The root cause of those clicks could be either a DC offset before the volume stage or the sudden change of the envelope of the audio signal. With the Softstep feature both kinds of clicks could be reduced to a minimum and are no more audible (see figure 6). Bass There are three parameters programmable in the bass stage (see figs 7, 8, 9, 10): - Attenuation - Center Frequency (60, 70, 80 and 100Hz) - Quality Factors (1, 1.25, 1.5 and 2) DC Mode In this mode the DC gain is increased by 4.4dB. In addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors. Note: Please notice that a started Mute action is always terminated and could not be interrupted by a change of the mute signal. Figure 6. Soft Step Timing VOUT 2dB 1dB 10ms -1dB Time -2dB D97AU635 Note: For steps more than 1dB the softstep mode should be deactivated because it could generate a 1dB error during the blend-time Treble There are two parameters programmable in the treble stage (see figs 11, 12): - Attenuation - Center Frequency (10, 12.5, 15 and 17.5kHz). Speaker Attenuator Due to practical aspects the steps in the speaker attenuators are not linear over the full range. At attenuations more than 24dB the steps increase from 1.5dB to 10dB (please see data byte specification). 8/26 TDA7403 Figure 7. Bass Control @ fc = 80Hz, Q = 1 15.0 10.0 5.0 0.0 -5.0 -10.0 -15.0 10.0 100.0 1.0K 10.0K Figure 8. Bass Center @ Gain = 14dB, Q = 1 15.0 12.5 10.0 7.5 5.0 2.5 0.0 10.0 100.0 1.0K 10.0K Figure 9. Bass Quality factors @ Gain = 14dB, fc = 80Hz 15.0 12.5 10.0 Figure 10. Bass normal and DC Mode @ Gain = 14dB, fc = 80Hz 15.0 12.5 10.0 7.5 7.5 5.0 5.0 2.5 2.5 0.0 10.0 100.0 1.0K 10.0K 0.0 10.0 100.0 1.0K 10.0K Note: In general the center frequency, Q and DC-mode can be set independenty. The exception from this rule is the mode (5/xx1111xx) l where the center frequency is set to 150Hz instead of 100Hz. Figure 11. Treble Control @ fc = 17.5KHz 15.0 10.0 5.0 0.0 -5.0 Figure 12. Treble Center Frequencies @ Gain = 14dB 15.0 12.5 10.0 7.5 5.0 2.5 -10.0 0.0 -15.0 10.0 100.0 1.0K 10.0K 10.0 100.0 1.0K 10.0K 9/26 TDA7403 STEREODECODER PART No external components necessary PLL with adjustment free fully integrated VCO Automatic pilot dependent MONO/STEREO switching Very high suppression of intermodulation and interference Programmable Roll-Off compensation Dedicated RDS Softmute Highcut and Stereoblend characterisctics programmable in a wide range Internal Noiseblanker with threshold controls Multipath detector with programmable internal/external influence I2C bus control of all necessary functions ELECTRICAL CHARACTERISTICS (VS = 9V; deemphasis time constant = 50µs, VMPX = 500mV, 75KHz deviation, f = 1KHz. GI = 6dB, Tamb = 25°C; unless otherwise specified). Symbol VIN R in Gmin Gmax GSTEP SVRR α THD S+N Parameter MPX Input Level Input Resistance Minimum Input Gain Max Input Gain Step Resolution Supply Voltage Ripple Rejection Max Channel Separation Total Harmonic Distortion Signal plus Noise to Noise Ratio Test Condition Input Gain = 3.5dB Min. Typ. 0.5 100 3.5 11 2.5 60 50 0.02 91 Max. 1.25 Unit VRMS KΩ dB dB dB dB dB % dB Vripple = 100mv, f = 1khz 0.3 S = 2Vrms N MONO/STEREO SWITCH VPTHST1 VPTHST0 VPTHMO1 VPTHMO0 Pilot Threshold Voltage Pilot Threshold Voltage Pilot Threshold Voltage Pilot Threshold Voltage for Stereo, PTH = 1 for Stereo, PTH = 0 for Mono, PTH = 1 for Stereo, PTH = 0 15 25 12 19 mV mV mV mV PLL ∆f/f τHC50 τHC75 τHC50 τHC75 Capture Range 0.5 % µs µs µs µs DEEMPHASIS and HIGHCUT Deemphasis Time Constant Deemphasis Time Constant Highcut Time Constant Highcut Time Constant Bit = 7, Subadr. 10 = VLEVEL >> VHCH Bit = 7, Subadr. 10 = VLEVEL >> VHCH Bit = 7, Subadr. 10 = VLEVEL >> VHCL Bit = 7, Subadr. 10 = VLEVEL >> VHCL 0 1 0 1 50 75 150 225 STEREOBLEND and HIGHCUT-CONTROL REF5V TCREF5V LGmin LGmax LGstep VSBL min VSBL max VSBL step Internal Reference Voltage Temperature Coefficient Min. LEVEL Gain Max. LEVEL Gain LEVEL Gain Step Resolution Min.Voltage for Mono Max. Voltage for Mono Step Resolution 5 3300 0 10 0.67 33 58 8.4 V ppm dB dB dB %REF5V %REF5V %REF5V 10/26 TDA7403 ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit STEREOBLEND and HIGHCUT CONTROL VHCHmin VHCHmax VHCHstep VHCLmin VHCLmax α19 α38 α57 α76 α2 α3 α57 α67 α 114 α 190 Min.Voltage for NO Highcut Max. Voltage for NO Highcut Step Resolution Min. Voltage for FULL High cut Max. Voltage for FULL High cut 42 66 8.4 17 33 %REF5V %REF5V %REF5V %VHCH %VHCH Carrier and harmonic suppression at the output Pilot Signal Subcarrier Subcarrier Subcarrier f= f= f= f= 19KHz 38KHz 57KHz 76KHz 50 75 62 90 dB dB dB dB Intermodulation (Note1) Pilot Signal fmod = 10KHz; fspur = 1KHz; fmod = 13KHz; fspur = 1KHz; f = 57KHz 65 75 dB dB Traffic Radio (Note 2) Signal 70 dB SCA - Subsidiary Communications Authorization (Note 3) Signal f = 67KHz 75 dB ACI - Adjacent Channel Interference (Note 4) Signal Signal f = 114KHz f = 190KHz 95 84 dB dB Notes to the characteristics: 1. Intermodulation Suppression: measured with: 91% pilot signal; fm = 10kHz or 13kHz. 2. Traffic Radio (V.F.) Suppression: measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f = 57kHz, fm = 23Hz AM, m = 60%) 3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal; fm = 1kHz; 10%SCA - subcarrier ( fs = 67kHz, unmodulated ). 4. ACI ( Adjacent Channel Interference ) measured with: 90% mono signal; 9% pilot signal; fm =1kHz; 1% spurious signal ( fs = 110kHz or 186kHz, unmodulated). 11/26 TDA7403 NOISE BLANKER PART internal 2nd order 140kHz high pass filter programmable trigger threshold additional circuits for trigger adjustment (deviation, field-strenght) very low offset current during hold time four selectable pulse suppression times ELECTRICAL CHARACTERISTICS (continued) Symbol VTR Parameter Trigger Threshold 0) 1) Test Condition meas. with VPEAK = 0.9V Min. NBT = 111 NBT = 110 NBT = 101 NBT = 100 NBT = 011 NBT = 010 NBT = 001 NBT = 000 NCT = 00 NCT = 01 NCT = 10 NCT = 11 Typ. 30 35 40 45 50 55 60 65 260 220 180 140 0.9 1.7 2.5 0.9(off) 1.2 2.0 2.8 0.9(off) 1.3 1.8 2.3 Max. Unit mVOP mVOP mVOP mVOP mVOP mVOP mVOP mVOP mVOP mVOP mVOP mVOP V V V VOP VOP VOP VOP V V V V VTRNOISE Noise Controlled Trigger Threshold 2) meas. with VPEAK = 1.5V VRECT Rectifier Voltage VRECT DEV deviation dependent 3) rectifier Voltage VRECT FS Fieldstrength Controlled Rectifier Voltage 4) VMPX = 0mV VMPX = 50mV; f = 150KHz VMPX = 100mV; f = 150KHz OVD = 11 means. with VMPX = 800mV OVD = 10 (75KHz dev.) OVD = 01 OVD = 00 FSC = 11 means. with VMPX = 0mV FSC = 10 VLEVEL