TDA7405 STMicroelectronics, TDA7405 Datasheet
TDA7405
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TDA7405 Summary of contents
Page 1
... The digital control allows a programming in a wide range of all the filter characteristics. Also the stereodecoder part offers several possibilities of programming especially for the adaptation to different IF-devices. TDA7405 Package TQFP44 REV. 2 1/57 ...
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... TDA7405 Table 2. SUPPLY Symbol Parameter V Supply Voltage s I Supply Current s SVRR Ripple Rejection @ 1KHz Table 3. THERMAL DATA Symbol R Thermal Resistance Junction-pins max Th j-pins Table 4. ABSOLUTE MAXIMUM RATINGS Symbol V Operating Supply Voltage s T Operating Temperature Range amb T Storage Temperature Range stg 3 ESD All pins are protected against ESD according to the MIL883 standard ...
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... Figure 4. BLOCK DIAGRAM (Enlarged view) TDA7405 3/57 ...
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... TDA7405 4 AUDIOPROCESSOR PART Features: Input Multiplexer 2 fully differential CD stereo inputs with programmable attenuation 1 single-ended stereo input 2 differential mono input 1 single-ended mono input In-Gain 0..15dB, 1dB steps internal Offset-cancellation (AutoZero) separate second source-selector Beep internal Beep with 3 frequencies + diagnostic setting (19kHz tone) ...
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... Adjacent Gain Steps MIN MAX Differential only at true differential input 1kHz CM RMS 10kHz CM RMS Differential 1kHz CM RMS 10kHz CM RMS Mix-Gain = 6dB f Beep1 f Beep2 f Beep3 f Beep4 RMS Main / Mix-Source TDA7405 Min. Typ. Max. Unit 70 100 130 k 2.0 2.2 V RMS 80 100 0 ...
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... TDA7405 Table 5. ELECTRICAL CHARACTERISTICS (continued) (V =9V; T =25°C; R =10k ; all gains=0dB; f=1kHz; unless otherwise specified) S amb L Symbol Parameter 2) MULTIPLEXER OUTPUT R Output Impedance OUT R Output Load Capacitance Voltage Level confgured as Multiplexer-Output LOUDNESS CONTROL A Step Resolution STEP A Max. Attenuation MAX f Peak Frequency Peak ...
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... Max. Attenuation MAX A Step Resolution STEP A Output Mute Attenuation MUTE Test Condition off Window 1 Window 2 Window 3 TDA7405 Min. Typ. Max. Unit 100 110 Hz 117 130 143 Hz 135 150 165 Hz 180 200 220 Hz 0.9 1 1.1 1.1 1.25 1.4 1.3 1.5 1.7 1 ...
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... TDA7405 Table 5. ELECTRICAL CHARACTERISTICS (continued) (V =9V; T =25°C; R =10k ; all gains=0dB; f=1kHz; unless otherwise specified) S amb L Symbol Parameter E Attenuation Set Error Steps DC MONO VOICE BANDPASS f Highpass corner frequency HP f Lowpass corner frequency LP COMPANDER G max. Compander Gain MAX t Attack time Att t Release time ...
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... RMS bass, treble at +12dB; a-weighted 2.6V O RMS all stages 0dB IN RMS Bass & Treble = 12dB OUT RMS -20dB -20 to -60dB V TDA7405 Min. Typ. Max. Unit 3 15 µ µV 106 dB 100 dB 0.005 0.1 % 0.05 0 100 ...
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... TDA7405 5 DESCRIPTION OF THE AUDIOPROCESSOR PART 5.1 Input stages In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single- ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present. Figure 5. Input stages 5.1.1 Full-differential stereo Input 1 (FD1) The FD1-input is implemented as a buffered full-differential stereo stage with 100k input-impedance at each input ...
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... The pause-detector is driven by the internal stereodecoder-outputs in order to use pauses in the FM-signal for alternate-frequency-jumps. If the signal-level of both stereodecoder channels is outside the programmed volt- age-window, the external capacitor is abruptly discharged. Inside the pause-condition the capacitor is slowly re- charged by a constant current of 25µA. The pause information is also available via IIC-Bus (see IIC-Bus programming). TDA7405 11/57 ...
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... TDA7405 5.4 Loudness There are four parameters programmable in the loudness stage: 5.4.1 Attenuation Figure 6 shows the attenuation as a function of frequency 400Hz. Figure 6. Loudness Attenuation @ fP = 400Hz 0.0 -5.0 -10.0 dB -15.0 -20.0 -25.0 10.0 5.4.2 Peak Frequency Figure 7 shows the four possible peak-frequencies at 200, 400, 600 and 800Hz Figure 7 ...
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... S-shaped curve to mute slow in the critical regions (see Figure 9). For timing purposes the Bit of the I2C- bus output register is set to 1 from the start of muting until the end of de-muting. Figure 9. Softmute-Timing Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal. 100.0 1.0K Hz TDA7405 10.0K 13/57 ...
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... TDA7405 5.6 SoftStep-Volume When the volume-level is changed audible clicks could appear at the output. The root cause of those clicks could either be a DC-Offset before the volume-stage or the sudden change of the envelope of the audiosignal. With the SoftStep-feature both kinds of clicks could be reduced to a minimum and are no more audible. The blend-time from one step to the next is programmable in four steps ...
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... Quality Factors Figure 13 shows the four possible quality factors 1, 1.25, 1.5 and 2. Figure 13. Bass Quality factors @ Gain = 14dB 80Hz 15.0 12.5 10.0 7.5 5.0 2.5 0.0 10.0 100.0 1.0K Hz 100.0 1.0K TDA7405 10.0K 10.0K 15/57 ...
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... TDA7405 5.7.4 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. Figure 14. Bass normal and DC Mode @ Gain = 14dB 80Hz 15.0 12.5 10.0 7.5 5.0 2 ...
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... Attenuation (1dB-steps). In addition several configurations are possible to use the filters in the front- or rear-path. Table 6. Gain, Center Frequency and Quality Factor of Equalizer Filters Parameter Gain Center Frequency Filter 1 Center Frequency Filter 2 Quality Factor 100.0 1.0K Min -15 63 300 1 TDA7405 10.0K Max Unit 15 dB 840 Hz 4000 Hz 4 17/57 ...
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... TDA7405 5.9.1 Equalizer-Setup The two Filters can be configured in multiple ways in order to cover as most as possible applications. Both filters can be programmed to be either in the front the rear-path, respectively. This feature enables to have e.g. the High-Filter in the front- and both filters in the rear-path. Figure 17. Equalizer Configuration 5 ...
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... Frequencies Figure 19 shows the different center frequencies of the EQ-Filter gain Figure 19. Center-Frequencies of EQ-Filter 1e+02 2e+01 5.9.4 Q-Factor Figure 20 shows the four possible quality factors and 4. Figure 20. Different Q-factors of Equalizer-Filter 2e+01 1e+02 1e+04 1e+03 1e+03 1e+04 TDA7405 Hz 2e+04 2e+04 Hz 19/57 ...
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... TDA7405 5.10 Compander 5.10.1Signal-Compression A fully integrated signal-compressor with programmable Attack- and Decay-times is present in the A631 (see Figure 20). The compander consists of a signal-level detection, an A/D-Converter plus adder and the normal SoftStep-Volume-stage. First of all the left and the right InGain-signal is rectified, respectively, and the logarithm is build from the summed signal ...
Page 21
... For this purpose an AC-Coupling is placed before the speaker-attenuators, which can be activated or internally shorted by I²C-Bus. In short condition the input-signal of the speaker-attenuator is available at the AC-Outputs. The input-impedance of this AC-Inputs is 50k . -8dB 2:1 0 -10 -20 -30 Input Level Attack-Time SoftStep-Time 6ms 12ms 24ms 48ms -38dB 15dB -40 -50 -60 dB 0.16ms 0.32ms 0.64ms 1.28ms TDA7405 21/57 ...
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... TDA7405 5.10.6Output Selector The output-selector allows to connect the main- or the second-source to the Front-, Rear-speaker-attenuator, respectively example of this programming the device is able to connect via software the main-source to the back (rear) and the second-source to the front (see Figure 23). Figure 23. Output Selector 5.10.7Speaker-Attenuator and Mixing A Mixing-stage is placed after each speaker-attenuator and can be set independently to mixing-mode ...
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... Test Conditions Min. Input Gain = 3.5dB 1.5 8.5 1. 100mV 1kHz ripple f =1kHz, mono in A-weighted rms for Stereo, PTH = 1 for Stereo, PTH = 0 for Mono, PTH = 1 for Mono, PTH = 0 0.5 TDA7405 = 500mV (75kHz deviation), Typ. Max. Unit 0.5 1.25 V rms 70 100 130 k 3 ...
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... TDA7405 Table 7. ELECTRICAL CHARACTERISTICS (continued 9V, deemphasis time constant = 50µs, MPX input voltage V S modulation frequency = 1kHz, input gain = 6dB, T Symbol Parameter Deemphasis Timeconstants FM DeempF M M Highcut Timeconstant Multiplier Deemphasis Timeconstants AM DeempA M M Highcut Timeconstant Multiplier AM AM REF5V Internal Reference Voltage L min. LEVEL Gain ...
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... V sig nal a t1kHz o = ------------------------------------------------------------------------------------ - V sp urious at1kH z±23kHz o V sign al at1 kHz o --------------------------------------------------------------- - ƒ spu rio us at9kHz o = 500mV (75kHz deviation), MPX Min. Typ. Max 10kHz 19kHz – 3 13kHz – 38kHz 3 38kHz 67kH z – TDA7405 Unit 25/57 ...
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... TDA7405 Note 4. ACI ( Adjacent Channel Interference ) 114 = 190 = measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal (f modulated). 8 NOISE BLANKER PART 8.1 Features: AM and FM mode internal 2nd order 140kHz high-pass filter for MPX path internal rectifier and filters for AM-IF path ...
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... Signal PEAK in 0 Testmode 1 Signal PEAK in 00 Testmode Signal AM-RECTIFIER in Testmode Signal AM-RECTIFIER in Testmode = 2 µs, THIGH= 2 µs and µs. The repetition rate must not increase the PEAK voltage TDA7405 Min. Typ. Max. Unit 0.5 0.9 1.3 V 1.5 1.7 2 2.5 2.9 V 0.5 ...
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... TDA7405 Figure 25. Noiseblanker Test-Pulse Figure 26. Trigger Threshold vs. VPEAK VTH MIN. TRIG. THRESHOLD 65mV 8 STEPS 30mV 0.9V 28/ HIGH T F 1.5V Time 260mV (00) 220mV (01) 180mV (10) 140mV (11) NOISE CONTROLLED TRIG. THRESHOLD V PEAK [V] ...
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... Figure 27. V PEAK [ 2.8 2.0 1.2 0.9 20 Figure 28. Fieldstrenth Controlled Trigger Adjustment V PEAK 3V NOISE noisy signal 32 MONO STEREO 2.4V (00) 1.9V (01) 1.4V (10) ATC_SB OFF (11) good signal TDA7405 Detector off (11) DEVIATION [KHz] 0.9V E' 29/57 ...
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... TDA7405 9 MULTIPATH DETECTOR 9.1 Features: internal 19kHz band-pass filter programmable band-pass- and rectifier-gain selectable internal influence on Stereoblend and/or Highcut Table 9. ELECTRICAL CHARACTERISTICS Symbol Parameter f Center frequency of Multipath- CMP Bandpass G Bandpass Gain BPMP G Rectifier Gain RECTMP I Rectifier Charge Current CHMP I Rectifier Discharge Current ...
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... If any other source than the stereodecoder is selected the decoder remains muted and the MPX-pin is connect avoid any discharge of the coupling capacitor through leakage currents. No further mute command ref should be applied. Figure 30. Signals during stereodecoder's SoftMute Figure 31. Signal-Control via SoftMute-Pin TDA7405 31/57 ...
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... TDA7405 10.2 InGain + Infilter The InGain stage allows to adjust the MPX-signal to a magnitude of about 1Vrms internally which is the recom- mended value. The 4.th order input filter has a corner frequency of 80kHz and is used to attenuate spikes and noise and acts as an anti-aliasing filter for the following switch capacitor filters. ...
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... Figure 33. Relation between internal and external LEVEL-voltages for setup of Stereoblend 10.9 Highcut Control The highcut control setup is similar to the stereoblend control setup : the starting point VHCH can be set with 2 bits to be 42, 50 66% of REF5V whereas the range can be set to be 17, 22 33% of VHCH (see Figure 30 TDA7405 33/57 ...
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... TDA7405 Figure 34. Highcut characteristics 11 FUNCTIONAL DESCRIPTION OF THE NOISEBLANKER In the automotive environment the MPX-signal as well as the AM-signal is disturbed by spikes produced by the ignition and other radiating sources like the wiper-motor. The aim of the noiseblanker part is to cancel the audi- ble influence of the spikes. Therefore the output of the stereodecoder is held at the actual voltage for a time between 22 and 38µ ...
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... Selecting the "internal influence" in the configuration byte the Stereo-Blend and/or the Highcut is automatically invoked during a multipath condition according to the voltage appearing at the MP_OUT-pin. and D of the noiseblanker-byte I (bit combination '00' turns The second possibility is to activate the threshold driven discharge which = nfinite and V = 2.5V MPout TDA7405 of Multipath-Control-Byte) gives 7 of noiseblanker-byte II-byte). 7 35/57 ...
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... TDA7405 Figure 36. Blockdiagram of the Multipath-Detector 11.5 Quality Detector The TDA7405 offers a quality detector output which gives a voltage representing the FM-reception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the follow- ing formula : The noise-signal is the PEAK-signal without additional influences (see noiseblanker description). The factor 'a' can by programmed to 0 ...
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... Dual-MPX Mode The TDA7405 is able to support a twin tuner concept via the Dual-MPX-Mode. In this configuration the MPX-pin and the MD2G-pin are acting as MPX1 and MPX2 inputs. The DC-Voltage at the MD2-pin controls whether one or both MPX-signals are used to decode the stereo FM-signal designed as a window-comparator with the characteristic shown in Figure 36 (Please note that the thresholds have a hysteresis of 500mV) ...
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... TDA7405 Figure 38. Weak-Signal Mute-Depth @ 0.5V Threshold -10 -15 -20 -25 -30 -35 -40 0.0 0.1 Figure 39. Weak-Signal Mute-Threshold @ 24dB Mute-Depth -10 -15 -20 -25 -30 0.0 0.1 11.8 Stereodecoder Testmode During the Testmode, which can be activated by setting bit D0 and bit D1 of the stereodecoder testing-byte, several internal signals are available at the FD2R+ pin. During this mode the input resistance of 100kOhm is disconnected from the pin ...
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... MSB The programming after POR is marked bold-face / underlined in the programming tables. With this programming all the outputs are muted to V SUBADDRESS MSB LSB ACK LSB LSB REF OUT DD TDA7405 DATA 1 ... DATA n MSB LSB DATA ACK /2). P 39/57 ...
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... TDA7405 12.2 SUBADDRESS (receive mode) MSB 40/57 LSB Compander Hold off on AutoZero Remain off on Auto-Increment Mode off on Subaddress Main Source Selector Loudness Volume Treble Bass Mixing Programming SoftMute Voice-Band Second Source Selector Equalizer Frequencies Equalizer-Config. / Bass Compander Configuration Audioprocessor Configuration Audioprocessor II ...
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... LSB Source Selector FD1 / SE2 SE3 FD2 SE1 MD2 MD1 / SE4 Stereodecoder Input Gain 0 0dB 1 1dB : : 0 14dB 1 15dB Mute off on LSB Attenuation - - - not allowed Center Frequency 200Hz 400Hz 600Hz 800Hz Loudness Order First Order Second Order TDA7405 FUNCTION FUNCTION 41/57 ...
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... TDA7405 1) Table 13. Volume (2) MSB Note 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. Table 14. Treble Filter (3) MSB 42/57 LSB Gain/Attenuation (+32.0dB (+31.5dB +20.0dB ...
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... LSB Mixing 0 Mute 1 enable Mixing Source 0 0 Beep 0 1 MD1 1 0 MD2 mono Mixing Target Speaker LF off Speaker LF on Speaker RF off Speaker RF on Speaker LR off Speaker LR on Speaker RR off Speaker RR on Loudness Main/2nd 2nd Main TDA7405 FUNCTION FUNCTION 43/57 ...
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... TDA7405 Table 17. SoftMute (6) MSB Table 18. VoiceBand (7) MSB 44/57 LSB SoftMute 0 On (Mute) 1 Off MuteTime 123 324 ms Influence on Stereodecoder Highohmic-Mute on off Influence on Pilot-detector Hold and MP-Hold on off Influence on SoftMute on off Beep Frequencies 500 Hz 780 Hz 1.8 kHz 19 kHz LSB Voice-Band Low-Pass Enable ...
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... 250 297 353 421 500 595 707 841 Hz Frequencies EQ High-Filter 297 Hz 353 Hz 421 Hz 500 Hz 595 Hz 707 Hz 841 Hz 1.0 kHz 1.19 kHz 1.41 kHz 1.68 kHz 2.0 kHz 2.38 kHz 2.83 kHz 3.36 kHz 4.0 kHz TDA7405 FUNCTION FUNCTION 45/57 ...
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... TDA7405 Table 21. EQ-Configuration / Bass (10) MSB Table 22. Compander (11) MSB Note: 1. The SoftStep-Times are only programmable while the Compander is not used. 46/57 LSB Filter Rear Path Filter 0 1 High-Filter 1 0 Low-Filter 1 1 High+Low-Filter EQ Filter Front Path 0 no Filter 1 High-Filter 0 Low-Filter 1 High+Low-Filter AM Noisebl. SoftUnMute ...
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... Main Source internal coupled LSB Pause Detector 0 off 1 on Pause ZC Window 0 0 160mV 0 1 80mV 1 0 40mV 1 1 not allowed FD1 Mode single ended differential FD1 Attenuation -12dB -6dB -6dB 0dB FD2 Attenuation -6dB 0dB MD1 Mode single ended differential TDA7405 FUNCTION FUNCTION 47/57 ...
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... TDA7405 Table 25. Equalizer Low-Filter (14) MSB Table 26. Equalizer High-Filter (15) MSB 48/57 LSB Gain / Attenuation -15dB -14dB : : : : -1dB 0dB 0dB +1dB : : : : +14dB +15dB Equalizer Pause-Detector Source Rear Input-Selector Front Input-Selector LSB Gain / Attenuation -15dB -14dB : : : : -1dB 0dB 0dB +1dB : : : : +14dB +15dB Equalizer Switch Qual.-Detector Noise Content ...
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... Compander Log-Amp. Output 0 1 Compander Low-Pass Output 1 0 Compander DAC Output 1 1 200kHz Oscillator 0 0 not allowed Mute 1 0 NB-Hold 1 1 internal Reference Compander Testmode off on Clock external internal AZ Function off on SC-Clock Fast Mode Normal Mode TDA7405 ATTENUATION FUNCTION 49/57 ...
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... TDA7405 Table 29. Stereodecoder (22) MSB Note Deemphasis-Shift enabled (Subaddr.26/Bit7 = 0) Table 30. Noiseblanker I (23) MSB 50/57 LSB STD Unmuted 1 STD Muted 0 0 IN-Gain 11dB 0 1 IN-Gain 8.5dB 1 0 IN-Gain 6dB 1 1 IN-Gain 3.5dB 0 Input AM-Pin 1 Input MPX-Pin Forced MONO MONO/STEREO switch automatically Pilot Threshold HIGH Pilot Threshold LOW Deemphasis 50µ ...
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... Strong Multipath influence on PEAK 18k off on (18k discharge if V LSB Stereodecoder Mode Rectifier Gain 6dB 8dB 10dB 12dB 14dB 16dB 18dB 20dB Rectifier Cut-Off Frequency 14.0kHz 18.5kHz 28.0kHz 56.0kHz Overdeviation Time Constant on off AM Blank-Mode High-Ohmic Mute Sample&Hold TDA7405 FUNCTION < 2.5V) MPout FUNCTION 51/57 ...
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... TDA7405 Table 33. High-Cut (26) MSB Table 34. Fieldstrength Control (27) MSB 52/57 LSB High-Cut 0 off 1 on max. High-Cut 0 0 2dB 0 1 5dB 1 0 7dB 1 1 10dB VHCH 42% REF5V 1 50% REF5V 0 58% REF5V 1 66% REF5V VHCL 16.7% VHCH 22.2% VHCH 27.8% VHCH 33.3% VHCH Deemphasis Shift ...
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... Gain = 0dB 1 disabled Charge Current at MP-Out 0.25µA 0.50µA Multipath on High-Cut Decay-Time 2ms 10ms Multipath influence on PEAK Discharge off -1V/ms LSB Roll-Off Compensation not allowed 7. 9. 13. 20. not allowed 19. 21. 25. 31.0% LEVEL Gain 0 0dB 1 0.4dB 0 0.8dB : : 1 6dB TDA7405 FUNCTION FUNCTION 53/57 ...
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... TDA7405 Table 37. Stereodecoder Configuration (30) MSB Note: 1. Using the Multipath Time-Constants for Stereo-Bland and High-Cut Table 38. Testing Stereodecoder(31) MSB Note : This byte is used for testing or evaluation purposes only and must not set to other values than "11111100" in the application 54/57 LSB Multipath Influence on High-Cut ...
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... TQFP44 ( 1.4mm) 0.039 TQFP4410 TDA7405 OUTLINE AND MECHANICAL DATA 0.10mm .004 Seating Plane C K 0076922 D 55/57 ...
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... TDA7405 Table 39. Revision History Date Revision October 2001 May 2004 56/57 1 First Issue 2 modified Electrical Characteristics and Stylesheet Description of Changes ...
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... TDA7405 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 ...