TDA7461NDTR STMicroelectronics, TDA7461NDTR Datasheet
TDA7461NDTR
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TDA7461NDTR Summary of contents
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... Device summary Order code TDA7461ND TDA7461NDTR (1) E-TDA7461ND (1) E-TDA7461NDTR 1. Device in ECOPACK® package, see January 2009 This is information on a product still in production but not recommended for new designs. Switched-capacitors design technique allows to obtain all these features without external components or adjustments. This means that higher quality and reliability walks alongside an overall cost saving ...
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Contents Contents 1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 Block ...
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TDA7461 4 Stereo decoder part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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List of tables List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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TDA7461 List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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Block diagram and pin description 1 Block diagram and pin description 1.1 Block diagram Figure 1. Block diagram CDL CDG CDR MIXING AM STAGE 3 CASS R 4 CASS L INPUT PHONE MULTIPLEXER + 9 BEEP ...
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TDA7461 Table 2. Pin description N. Name 1 ACINL 2 ACINR 3 CASSR 4 CASSL 5 CDR 6 CDGND Ground reference CD 7 CDL 8 PHGND Phone ground 9 PHONE Phone input MPX 12 LEVEL 13 MPIN ...
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Electrical specification 2 Electrical specification 2.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol V Operating supply voltage S T Operating ambient temperature range amb T Storage temperature range stg 2.2 Supply Table 4. Supply Symbol Parameter V Supply ...
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TDA7461 2.5 Audio processor part feature 2.5.1 Input multiplexer ● Fully differential or quasi-differential CD and cassette stereo input ● AM mono or stereo input ● Phone differential or single ended input ● Internal beep with 2 frequencies (selectable) ● ...
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Electrical specification 2.6 Audio processor electrical characteristics Table 6. Audio processor electrical characteristics ( ° amb Symbol Parameter Input selector R Input resistance in V Clipping level CL S Input separation IN ...
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TDA7461 Table 6. Audio processor electrical characteristics (continued ° amb Symbol Parameter A Step resolution STEP E Attenuation set error A Tracking error steps DC LOudness control ...
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Electrical specification Table 6. Audio processor electrical characteristics (continued ° amb Symbol Parameter Bass-DC-gain DC GAIN Treble control C Control range RANGE A Step resolution STEP Center frequency f C Speaker ...
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TDA7461 3 Description of the audio processor part 3.1 Programmable input matrix The programmable input matrix of the TDA7461 offers several possibilities to adapt the audioprocessor to the desired application the standard application we have: ● CD quasi ...
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Description of the audio processor part Table 7. Input and source programming Appl CDR 5 CDR 6 CDR 1. Syntax 0/xxx11100 means: SUBADDRESS = 0 - DATA BYTE = xxx11100 (x - ...
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TDA7461 The TDA7461 can be configured with an additional input; if the AC coupling before the speaker stage is not used (bit 7 in subaddress 5 set to "1") ACINL and ACINR pins can be used as an additional stereo ...
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Description of the audio processor part If bit D3 byte 10 (Stdec Register) is set to 0, then the stdec signal will be always available at the Mux out pins, no matter which is the selected source. The selection of ...
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TDA7461 Figure 7. Loudness attenuation = 400 Hz 3.3.2 Softmute The digitally controlled softmute stage allows muting/demuting the signal with a I programmable slope. The mute process can either be activated by the softmute pin ...
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Description of the audio processor part Figure 9. Soft step timing 1. For steps more than 1dB the soft step mode should be deactivated because it could generate a 1dB error during the blend-time. 3.3.4 Bass There are three parameters ...
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TDA7461 Figure 10. Bass control @ Hz Figure 12. Bass quality factors @ Gain = 14 dB Figure 14. Treble control @ fc = 17.5 kHz) (1) In general the ...
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Stereo decoder part 4 Stereo decoder part 4.1 Stereo decoder feature ● 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 ...
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TDA7461 Table 8. Stereo decoder electrical characteristics (continued de-emphasis time constant = 50 μ dB °C; unless otherwise specified) I amb Symbol Parameter (1) De-emphasis and high cut ...
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Stereo decoder part Table 8. Stereo decoder electrical characteristics (continued de-emphasis time constant = 50 μ dB °C; unless otherwise specified) I amb Symbol Parameter (3) Traffic radio ...
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TDA7461 4.3 Noise blanker part nd ● internal 2 order 140 kHz high pass filter ● programmable trigger threshold ● additional circuits for trigger adjustment (deviation, field-strength) ● very low offset current during hold time ● four selectable pulse suppression ...
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Stereo decoder part Figure 16. Noise blanker diagram Figure 17. Trigger threshold vs STEPS Figure 18. Deviation controlled trigger adjustment V PEAK (V 24/ D97AU636 HIGH PEAK VTH MIN. TRIG. ...
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TDA7461 Figure 19. Fieldstrength controlled trigger adjustment V PEAK 4.4 Multipath detector ● Internal 19 kHz bandpass filter ● Programmable bandpass and rectifier gain ● Two pin solution fully independent usable for external programming ● Selectable internal influence on Stereo ...
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Stereo decoder part 4.5 Description of stereo decoder The stereo decoder part of the TDA7461 (see demodulate the MPX signal like pilot tone dependent mono/stereo switching as well as “stereo blend” and “high cut” functions. Adaptations like programmable input gain, ...
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TDA7461 4.5.3 Demodulator In the demodulator block the left and the right channel are separated from the MPX signal. In this stage also the 19 kHz pilot tone is cancelled. For reaching a high channel separation the TDA7461 offers an ...
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Stereo decoder part 4.5.6 Fieldstrength control The fieldstrength input is used to control the high cut and the stereo blend function. In addition the signal can be also used to control the noise blanker thresholds. 4.5.7 Level input and gain ...
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TDA7461 All necessary internal reference voltages like REF5V are derived from a band gap circuit. Therefore they have a temperature coefficient near zero. This is useful if the fieldstrength signal is also temperature compensated. But most IF devices apply a ...
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Stereo decoder part 4.6.1 Trigger path The incoming MPX signal is highpass filtered, amplified and rectified. This second order highpass-filter has a corner frequency of 140 kHz. The rectified signal, RECT, is lowpass filtered to generate a signal called PEAK. ...
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TDA7461 Because of the overlap of this range and the range of the stereo/mono transition it can be controlled by stereo blend. This threshold increase is programmable in 3 steps or switched off with bits D0 and D1 of the ...
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Stereo decoder part Figure 27. Application example 100nF CASS R 100nF CASS L 100nF CDR CDG 100nF CDL 220nF PHGND 220nF PHONE Note: Bit D7 of "Bass and Treble Filter characteristics" set to 1 Figure ...
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TDA7461 bus interface description 5.1 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 ...
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I C bus interface description Table 12. Subaddress (receive mode) MSB Testmode I = Auto increment AZ = Auto Zero Remain X = not used 34/ ...
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TDA7461 6 Data byte specification Table 13. Input selector MSB For example to select the CD input in quasi-differential mode with gain the Data ...
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Data byte specification Table 14. Loudness MSB Note: The attenuation is specified at high frequencies. Around the center frequency the value is different depending on the programmed attenuation (see Loudness frequency response). 36/48 D4 ...
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TDA7461 Table 15. Mute, Beep and Mixing MSB Note: for more information to the Stereo decoder-Softmute-Influence please refer to the stereo decoder description ...
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Data byte specification Table 16. Volume MSB Note not recommended to use a gain more than 20dB for system performance ...
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TDA7461 Table 17. Bass and treble attenuation MSB For example 12dB Treble and -8dB Bass give the ...
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Data byte specification Table 18. Bass and treble filter characteristics MSB For deeper information see application examples For example Treble center frequency = 15kHz, Bass center frequency = 100Hz, Bass Q = ...
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TDA7461 ) Table 19. Speaker attenuation (LF, LR, RF, RR) MSB LSB ...
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Data byte specification Table 20. Stereo decoder MSB Table 21. Noise blanker MSB 42/ ...
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TDA7461 l Table 22. Field strength control MSB Table 23. Configuration MSB ...
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Data byte specification Table 24. Stereo decoder adjustment MSB 44/ ...
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TDA7461 Table 25. Testing MSB Note: This byte is used for testing or evaluation purposes only and must not be set to other values than the default "11111110" in the application ...
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Package information 7 Package information In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ...
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TDA7461 8 Revision history Table 26. Document revision history Date 20-Oct-2003 13-Jan-2009 Revision 6 Initial release. Document reformatted. Document status changed from datasheet to “not for new design”. 7 Removed all refences to DIP28 package. Added Table 1: Device summary ...
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