TDA7437N STMicroelectronics, TDA7437N Datasheet
TDA7437N
Specifications of TDA7437N
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TDA7437N Summary of contents
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... Pause detector programmable threshold ■ All functions programmable via serial I Description The audioprocessor TDA7437N is an upgrade of the TDA731X audioprocessor family. Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very Order codes ...
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... Speakers mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.4 Zero crossing mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.5 Pause function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.6 No symmetrical bass cut response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.7 Transmitted data (send mode 5.8 TDA7437N I2C bus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.9 I2C bus read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.10 Loudness stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.11 Treble stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.12 IN-OUT pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.13 Bass & mid filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ...
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... TDA7437N 5.14 Input selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6 Curves of electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3/34 ...
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... Thermal data Table 3. Quick reference data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 5. Subaddress (receive mode Table 6. Send mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 7. Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 8. Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 9. Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 10. Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 11. Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 12. Bass treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 13. Input stage gain middle Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4/34 TDA7437N ...
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... TDA7437N List of figures Figure 1. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 3. CLD and CDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 4. Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 5. Timing diagram of I Figure 6. Acknowledge on the I Figure 7. Power on time constant vs CREF capacitor CREF = 4.7mF . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 8. Power on time constant vs CREF capacitor CREF = 10mF . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 9. Power on time constant vs CREF capacitor CREF = 22mF . . . . . . . . . . . . . . . . . . . . . . . . 28 Figure 10 ...
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... STEREO3_R 10 MONO Parameter Parameter Parameter OUT_RF 32 OUT_LR 31 MID_LI 30 MID_LO 29 OUT_RR 28 SMEXT 27 BASS_RO 26 BASS_RI 25 BASS_LO 24 BASS_LI 23 MID_RO D96AU435B Value 10.5 - -55 to 150 Value 150 Min. Typ. Max 10.2 2.1 2.6 0.01 0.8 111 95 TDA7437N Unit V °C °C Unit °C/W Unit V Vrms % dB dB ...
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... TDA7437N Table 3. Quick reference data (continued) Symbol Input gain 1dB step Volume control 1dB step Treble control 2dB step Bass control 2dB step Middle control 2dB step Fader and balance control 1dB step Loudness control 1dB step Mute attenuation PIN descriptions and electrical specifications Parameter Min ...
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... PIN descriptions and electrical specifications Figure 2. Block diagram TREBL_L IN_L 8/34 MULTIPLEXER TDA7437N PAUSE SMEXT BASS_RO) TREB_R IN_R MUXOUT_R ...
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... TDA7437N 2 Electrical characteristics ( 9V test circuit, unless otherwise specified.) Table 4. Electrical characteristics Symbol Input selector (mono and stereo inputs) R Input resistance I V Clipping level CL S Input separation I R Output load resistance L G Minimum input gain I MIN G Maximum input gain I MAX G Step resolution ...
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... Adjacent attenuation steps From 0dB to A Loud = On WIN = 11 WIN = 10 (1) WIN = 01 WIN = 00 0dB to Mute C = 22nF -20dB; I CSM = I MAX C = 22nF -20dB; I CSM = I MIN CSM CSM (2) Soft mute active TDA7437N Min. Typ. Max 0.5 MAX 0 140 280 80 100 0 ...
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... TDA7437N Table 4. Electrical characteristics (continued) Symbol Treble control C Control range RANGE A Step resolution step Speaker attenuators C Control range RANGE A Step resolution step A Output mute attenuation MUTE E Attenuation set error steps DC Audio output V Clipping level clip R Output load resistance L R Output impedance ...
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... The CLD - and CDR - can be short-circuited in applications providing 3 wires CD signal Figure 3. CLD and CDR CLD - = DIFFINLGND CDR - = DIFFINRGND 12/34 Parameter Test condition V =1V all gain = 0dB 0. 1.6mA ∼ Min. Typ. 0. 0.1 Ω resistor TDA7437N R- R+ D02AU1384 TDA7437N Max. Unit 0. μA 5 0.4 V ...
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... TDA7437N bus interface Data transmission from the microprocessor to the TDA7437N, and vice versa, takes place through the 2 wires of the I up resistors to positive supply voltage must be externally connected). 3.1 Data validity As shown in Figure clock. The HIGH and LOW state of the data line can only change when the clock signal on the SCL line is LOW ...
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... Data validity SDA SCL Figure 5. Timing diagram of I SCL SDA Figure 6. Acknowledge on the I SCL SDA START 14/34 DATA LINE CHANGE STABLE, DATA DATA VALID ALLOWED 2 C Bus D99AU1032 START 2 C Bus MSB D99AU1033 TDA7437N D99AU1031 2 I CBUS STOP ACKNOWLEDGMENT FROM RECEIVER ...
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... TDA7437N 4 Software specification 4.1 Interface protocol The interface protocol comprises of: ● A start condition (s) ● A chip address byte, (the LSB bit determines read (=1)/write (=0) transmission) ● A subaddress byte. ● A sequence of data (N-bytes + acknowledge) ● A stop condition (P) CHIP ADDRESS MSB ACK = Acknowledge Start Stop Auto increment Not used ...
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... OUTR-INR (OUTL-INR) short circuited internally (no need for external connection Table 8. Loudness MSB D7 D6 16/ TDA7437N LSB Function Differential 0 1 Stereo Stereo Stereo Stereo Mono connect Half-diff 0dB Half-diff -6dB Full-diff 0dB Full-diff -6dB LSB Function D1 D0 Loudness step 0 0 0dB 0 1 1dB 1 0 2dB 1 1 3dB LSB P (1) (2) (2) (3) (3) ...
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... TDA7437N Table 8. Loudness (continued) MSB Table 9. Mute MSB Software specification LSB Function D1 D0 Loudness step 0 0 4dB 0 1 5dB 1 0 6dB 1 1 7dB 0 0 8dB 0 1 9dB 1 0 10dB 1 1 11dB 0 0 12dB 0 1 13dB 1 0 14dB 1 1 15dB 0 0 16dB ...
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... TDA7437N LSB Function D1 D0 Zero cross window (280mV) Zero cross window (140mV) Zerocross window (70mV) Zerocross window (35mV) Non symmetrical bass Symmetrical bass LSB Function 0dB 0 1 -1dB 1 0 -2dB 1 1 -3dB 0 0 -4dB 0 1 -5dB 1 0 -6dB 1 1 -7dB 16dB ...
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... TDA7437N Table 11. Speaker MSB Table 12. Bass treble MSB Software specification LSB Function D1 D0 1.25dB step 0 0 0dB 0 1 -1dB 1 0 -2dB 1 1 -3dB 0 0 -4dB 0 1 -5dB 1 0 -6dB 1 1 -7dB 0dB -8dB -16dB -24dB -32dB -40dB -48dB -56dB -64dB -72dB ...
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... TDA7437N LSB Function 0dB 1 0 2dB 0 1 4dB 0 0 6dB 1 1 8dB 1 0 10dB 0 1 12dB 0 0 14dB Bass steps -14dB -12dB -10dB -8dB -6dB -4dB -2dB 0dB 0dB 2dB 4dB 6dB 8dB 10dB 126B 14dB LSB Function D1 D0 In-gain step ...
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... TDA7437N Table 13. Input stage gain middle (continued) MSB Software specification LSB Function 4dB 0 1 5dB 1 0 6dB 1 1 7dB 0 0 8dB 0 1 9dB 1 0 10dB 1 1 11dB 0 0 12dB 0 1 13dB 1 0 14dB 1 1 15dB Middle step -14dB -12dB -10dB -8dB ...
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... Mute and pause features 5 Mute and pause features The TDA7437N provides three types of mute, controlled via I register). 5.1 Soft mute Bit → Soft mute ON Bit → Soft mute OFF It allows an automatic soft muting and unmuting of the signal. The time constant is fixed by an external capacitor Csm inserted between pin Csm and ground ...
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... TDA7437N 5.3 Speakers mute An additional direct mute function is included in the speakers attenuators stage. The four output LF, RF, LR, RR can be separately muted by setting the speaker attenuator byte to the value 01111111 binary. Typical attenuation level 100dB. This mute is useful for fader and balance functions. It should not be applied for system mute/unmute, because it can generate noise due to the offset of previous stages (bass / treble) ...
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... ON bitZM = 0Zero cross mute OFF bitSM = 1Soft mute ON bitSM = 0Soft mute OFF bitST = 1Stereo signal detected (input MPX) bitST = 0Mono signal detected (input MPX) The TDA7437N allows the reading of four info bits. 24/34 Figure 16). Figure 17 (symmetrical response) and ...
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... This feature can be implemented, for example gradual volume change has to be performed (the MCU does not send the STOP condition, but keeps the TDA7437N communication active). Warning: ...
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... The previous SGS-THOMSON audioprocessors implemented a fixed loudness response, only ON/OFF sw programmable. No possibility to change the loud boost rate at a certain volume level. The TDA7437N implements a fully programmable loudness control in 20 steps of 1dB. It allows a customized loudness response for each application. The external network connected to the loudness pins LOUD_L and LOUD_R fixes the type of loudness response ...
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... TDA7437N 5.13 Bass & mid filters Several bass filter types can be implemented. Normally it is the basic T-type bandpass filter that is used. Starting from the filter component values (R1 internal and R2, C1, C2 external), the centre frequency Fc, the gain Av at max bass boost and the filter Q factor are computed as follows: Vice versa fixed Fc, Av, and R1 (internal typ.± ...
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... D95AU383 S VRR (dB) -40 -50 4.7μF -60 47μF -70 -80 VS=8V Ripple=0.2VRMS -90 AV=-15dB -100 10 100 1K 10K (b) CH1 9V DC CH1 0.5V CH2 20mV SOFT MUTE CH3 0.2V CH4 20mV TDA7437N REF 2 1 TIME Freq(Hz) Chan 2 1ms 0.2V Chan 3 1ms TIME T/div 1ms 10 ...
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... TDA7437N Figure 12. Soft mute OFF (a) V Main Menu SOFT MUTE=OFF SLOPE=FAST Vout=500mVrms Pin Csm Figure 13. Zero crossing mute ON ZERO CROSSING MUTE = ON V LEFT Panel STATUS Memory Save PANEL Recall Auxiliary Setups Memory Card X-Y mode Persistance mode CH2 528mV DC RIGHT Return Figure 15 ...
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... Curves of electrical characteristics Figure 17. Symmetrical bass (dB -10 -15 10 100 1K Figure 19. Loudness ATT (dB 100 1K 30/34 Figure 18. unsymmetrical bass ATT D95AU393 (dB -10 -15 -20 -25 10K Freq(Hz) 10 D98AU887 10K Freq(Hz) TDA7437N D95AU394 100 1K 10K Freq(Hz) ...
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... TDA7437N Figure 20. Test board diagram CON1 C17 C18 22μF 100nF C19 5.6nF TRL C20 5.6nF 44 TRR 1 IN_R 2 C21 2.2μF 3 O_R C22 4.7nF CON4 4 LOUDR C23 4.7μF DIFG_R 5 DIFG_R C24 4.7μF DIFF_R 6 DIFF_R C25 470nF ST4_R 7 ST4_R C26 470nF ...
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... TDA7437N OUTLINE AND MECHANICAL DATA LQFP44 ( 1.40mm) Exposed Pad Down 7278839 C ...
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... TDA7437N 8 Revision history Table 14. Document revision history Date 24-Jan-06 01-Dec-06 Revision 1 Initial release. 2 Package changed, layout change, text modifications. Revision history Changes 33/34 ...
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... 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 of America 34/34 Please Read Carefully: © 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com TDA7437N ...