TDA7404D STMicroelectronics, TDA7404D Datasheet
TDA7404D
Specifications of TDA7404D
Available stocks
Related parts for TDA7404D
TDA7404D Summary of contents
Page 1
... The TDA7404 is a high performance signal processor specifically designed for car radio applications. Table 1. Device summary Order code TDA7404D December 2008 Car radio signal processor SO-28 The device includes a high performance audioprocessor with fully integrated audio filters. The digital control allows a programming in a wide range of all the filter characteristics ...
Page 2
Contents Contents 1 Detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
TDA7404 5 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 4
List of tables List of tables Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 5
TDA7404 List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 6
Detailed features 1 Detailed features ● Input multiplexer – 1 pseudo-differential stereo input (selectable single end stereo input) – 3 single-end stereo inputs – 1 differential mono input – In-Gain 0..14 dB steps, 14..20 dB steps ...
Page 7
TDA7404 2 Block and pin description diagrams Figure 1. Block diagram MIX DiffinL Diffgnd DiffinR SE1L SE1R SE2L SE2R SE3L SE3R Mono/Beep Mono+ Mono - Figure 2. Pin connection (top view) Beep Digital Control I Supply Gnd Vref Vcc SE1L ...
Page 8
Electrical specifications 3 Electrical specifications 3.1 Supply Table 2. Supply Symbol Parameter V Supply voltage s I Supply current s SVRR Ripple rejection @ 1 kHz 3.2 Thermal data Table 3. Thermal data Symbol R Thermal resistance junction pins Th ...
Page 9
TDA7404 3.5 Electrical characteristics Table 5. Electrical characteristics ( =25 ° amb Symbol Parameter Input selector R Input resistance in V Clipping level CL S Input separation IN G Min. input gain IN MIN G ...
Page 10
Electrical specifications Table 5. Electrical characteristics (continued =25 ° amb Symbol Parameter Mixing control M Mixing level LEVEL Volume control G Max. gain MAX A Max. attenuation MAX A Step resolution STEP E Attenuation ...
Page 11
TDA7404 Table 5. Electrical characteristics (continued =25 ° amb Symbol Parameter Soft-step T Switch time SW Bass control C Control range RANGE A Step resolution STEP f Center frequency C Q Quality factor BASS ...
Page 12
Electrical specifications Table 5. Electrical characteristics (continued =25 ° amb Symbol Parameter Fader outputs V Clipping level CLIP R Output load resistance L C Output load capacitance L R Output impedance OUT V DC ...
Page 13
TDA7404 4 Description of functionality 4.1 Input stages Most of the input stages have remained the same as in preceding ST-Audioprocessors with exception of the CD-inputs (see the market which have a significant high source-impedance which effects strongly the common-mode-rejection ...
Page 14
Description of functionality 4.2 AutoZero In order to reduce the number of pins there 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 ...
Page 15
TDA7404 4.4 Loudness There are four parameters programmable in the loudness stage: 4.4.1 Attenuation Figure 5 shows the attenuation as a function of frequency at f Figure 5. Loudness attenuation @ ...
Page 16
Description of functionality 4.4.3 Low and high frequency boost Figure 7 shows the different Loudness-shapes in low & high frequency boost. Figure 7. Loudness attenuation 4.5 ...
Page 17
TDA7404 4.6 Soft-step 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. ...
Page 18
Description of functionality 4.7.2 Center frequency Figure 11 shows the four possible center frequencies 60, 80,100 and 200 Hz. Figure 11. Bass center frequencies @ gain = 15 dB ...
Page 19
TDA7404 4.7.4 DC mode In this mode the DC-gain is increased by 4.4 dB. In addition the programmed center frequency and quality factor is decreased which can be used to reach alternative center frequencies or quality factors. ...
Page 20
Description of functionality 4.8 Treble There are two parameters programmable in the treble stage: 4.8.1 Attenuation Figure 14 shows the attenuation as a function of frequency at a center frequency of 17.5 kHz. Figure 14. Treble control @ f 2 ...
Page 21
TDA7404 4.9 External AC - coupling TDA7404 has external AC coupling terminals which can be selected one of two positions behind the mixing stage or bass filter. Figure 16. External AC coupling Mixin ...
Page 22
I2C bus interface bus interface 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 ...
Page 23
TDA7404 With this programming all the outputs are muted to V Note: All the blank bits in the following tables are "don't care"-bits. 5.4 Subaddress (receive mode) Table 7. Subaddress (receive mode) MSB ...
Page 24
I2C bus interface 5.5 Data byte specification Table 8. Input selector / gain MSB ...
Page 25
TDA7404 Table 9. Loudness MSB Note 1: The attenuation is specified at high frequencies. Around the center frequency the value is different depending on the programmed attenuation (see Table 10. Volume ...
Page 26
I2C bus interface Table 11. Treble programming MSB 26/ ...
Page 27
TDA7404 Table 12. Bass programming MSB Note 3: For more information please refer ...
Page 28
I2C bus interface Table 13. Speaker attenuator left front MSB Table 14. Speaker attenuator right front MSB 28/ ...
Page 29
TDA7404 Table 15. Speaker attenuator left rear MSB Table 16. Speaker attenuator right rear MSB ...
Page 30
I2C bus interface Table 17. Subwoofer attenuator (left and right) MSB Table 18. Soft-mute and mixing MSB 30/ ...
Page 31
TDA7404 Table 19. Others MSB Table 20. Testing MSB LSB ...
Page 32
Application circuit 6 Application circuit Figure 18. TDA7404 application circuit SE1L TapeL 100n SE1R TapeR 100n SE2L FM_L 100n SE2R FM_R 100n SE3L AM_L 100n AM_R SE3R 100n MONO+ Phone 100n MONO - PhoneGnd 100n DiffinL CD_L 100n DiffinGnd CDGnd ...
Page 33
TDA7404 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. ® ...
Page 34
Revision history 8 Revision history Table 21. Document revision history Date 15-Jul-2003 16-Dec-2008 34/35 Revision 1 Initial release. Document reformatted. Added Table 1: Device summary on page Updated Section 7: Package TDA7404 Changes 1. information. ...
Page 35
... TDA7404 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...