Datasheet

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September 2013 Rev 4 1/29

TDA7418

3 band car audio processor

Features

• Input multiplexer

– PD/SE4: pseudo differential stereo input,

programmable as single-ended input

– SE1: stereo single-end input

– SE2: stereo single-end input

– SE3: stereo single-end input

– Input gain adjust from 0 to 15dB with 1dB

steps

– Internal offset-cancellation (AutoZero)

• Loudness

– Second order frequency response

– Programmable center frequency

(400 Hz / 800 Hz / 2400 Hz)

– 15dB with 1dB steps

– Selectable low and high frequency boost

– Selectable flat-mode (constant attenuation)

•Volume

– +15dB to -79dB with 1dB step resolution

– Soft-step control with programmable blend

times

•Bass

– Second order frequency response

– Center frequency programmable in 4 steps

(60 Hz / 80 Hz / 100 Hz / 200 Hz)

– Q programmable 1.0/1.25/1.5/2.0

– DC gain programmable

– -15 to 15dB range with 1dB resolution

•Middle

– Second order frequency response

– Center frequency programmable in 4 steps

(500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz)

– Q programmable 0.5/0.75/1.0/1.25

– -15 to 15dB range with 1dB resolution

•Treble

– Second order frequency response

– Center frequency programmable in 4 steps

(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)

– -15 to 15dB range with 1dB resolution

• Speaker

– 4 independent soft step speaker controls,

+15dB to -79dB with 1dB steps direct mute

• Subwoofer

– Single-ended mono output

– Independent soft step level control, +15dB

to -79dB with 1dB steps

• Mute functions

– Direct mute

– Digitally controlled SoftMute with 3

programmable mute-times

(0.48 ms / 0.96 ms /123 ms)

Description

The TDA7418 includes a high performance audio

processor with fully integrated 3-Band filters to

process signals at audible frequencies. The digital

control allows a full programming of the

audioprocessor and filters characteristics.

SO20

Table 1. Device summary

Order code Temp range, C Package Packing

TDA7418 -40 to +85 SO20 Tube

TDA7418TR -40 to +85 SO20 Tape and reel

www.st.com

Summary of content (29 pages)

PAGE 1
TDA7418 3 band car audio processor Features • • Input multiplexer – PD/SE4: pseudo differential stereo input, programmable as single-ended input – SE1: stereo single-end input – SE2: stereo single-end input – SE3: stereo single-end input – Input gain adjust from 0 to 15dB with 1dB steps – Internal offset-cancellation (AutoZero) Loudness – Second order frequency response – Programmable center frequency (400 Hz / 800 Hz / 2400 Hz) – 15dB with 1dB steps – Selectable low and high frequency boost – Selectable
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Contents TDA7418 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 4 2.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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TDA7418 5 Contents 4.10 Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.11 MUX output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.12 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 I2C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.1 Interface protocol . . . . . . . . . . . .
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List of tables TDA7418 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. 4/29 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . .
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TDA7418 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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/29 7 8 9 5 6 3 4 1 2 DIFFG DIFFR SE1L SE1R SE2L SE2R SE3L SE3R INPUT MULTIPLEXER 3 6 VDD GND CREF 7 SUPPLY InGain AutoZero + Loudness SoftMute 2 19 I CBUS Middle SCL SDA 18 Treble DIGITAL CONTROL Softstep Volume Bass MIX Softstep Mono Fader Softstep Mono Fader Softstep Mono Fader Softstep Mono Fader Softstep Mono Fader AC00057 12 14 15 13 16 OUTSW OUTRR OUTLR OUTRF OUTLF Figure 1.
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TDA7418 Pin description 2 Pin description 2.1 Connection diagram Figure 2. Pin out SE3L 1 20 VDD SE3R 2 19 SDA SE2L 3 18 SCL SE2R 4 17 MUTE/MUXOUT SE1L 5 16 OUTLF SE1R 6 15 OUTLR DIFFL 7 14 OUTRR DIFFG 8 13 OUTRF DIFFR 9 12 OUTSW CREF 10 11 GND AC00058 2.2 Pin list Table 2. No.
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Electrical specification TDA7418 3 Electrical specification 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit (1) -0.4 to 10.2 -0.4 to VCC + 0.4 V Supply voltage for VCC VS for other pins Top Operating temperature range -40 to +85 °C Tstg Storage temperature -55 to +150 °C VESD ESD protection (Human Body Model) ±2000 V VESD ESD protection (Machine Model) ±200 V VESD ESD protection (Change Device Model) ±750 V 1.
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TDA7418 Table 4. Electrical specification Electrical characteristics (continued) VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified Symbol Parameter eNo Output noise @ speaker outputs Test condition Min. 20Hz-20kHz,flat; all stages 0dB Typ. Max. Unit 12 20 V Loudness control AMAX Max. attenuation -16 -15 -14 dB ASTEP Step resolution 0.5 1 1.5 dB fP1 360 400 440 Hz fP2 720 800 880 Hz fP4 2.1 2.4 2.
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Electrical specification Table 4. Electrical characteristics (continued) VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified Symbol QBASS TDA7418 Parameter Quality factor (1) Test condition Min. Typ. Max. Q1 0.9 1 1.1 Q2 1.1 1.25 1.4 Q3 1.3 1.5 1.7 Q4 1.8 2 2.2 Unit CRANGE Control range 14 15 16 dB ASTEP Step resolution 0.5 1 1.5 dB DCGAIN Bass-DC-gain DC = off DC = on 0 dB 3.5 4.
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TDA7418 Table 4. Electrical specification Electrical characteristics (continued) VS = 8.5 V; Tamb= 25 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified Symbol Parameter Test condition Min. Typ. 1.8 2 Max. Unit Audio outputs VCL ROUT Clipping level Output impedance RL Output load resistance CL Output load capacitor VDC d = 0.3% 30 VRMS 100 2 DC voltage level  k 10 nF 3.8 4.0 4.2 V Subwoofer attenuator GMAX Max. gain 14 15 16 dB AMAX Max.
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Description of the audioprocessor TDA7418 4 Description of the audioprocessor 4.1 Input stages In the basic configuration, one stereo pseudo differential (programmable as single-ended input) and three single-ended stereo inputs are available. Pseudo differential stereo input (PD/SE4) The PD input is implemented as a buffered pseudo differential stereo stage with 100k input-impedance at each input. The attenuation is fixed to -3dB in order to adapt the incoming signal level.
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TDA7418 Description of the audioprocessor selected and an undesired mute would appear at the outputs. For such applications, it can be switched in the AutoZero-Remain-Mode (Bit 6 of the subaddress-byte). If this bit is set to high, the AutoZero will not be invoked and the old adjustment-value remains. 4.3 Loudness There are four parameters programmable in the loudness stage: 4.3.1 Attenuation Figure 4 shows the attenuation as a function of frequency at fC = 400Hz Figure 4. 4.3.
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Description of the audioprocessor 4.3.3 TDA7418 Low and high frequency boost Figure 6 shows the different Loudness shapes in low & high frequency boost. Figure 6. 4.3.4 Loudness attenuation, fc = 2.4kHz Flat mode In flat mode the loudness stage works as a 0dB to -15dB attenuator. 4.4 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.
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TDA7418 4.5 Description of the audioprocessor 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 audio signal. With the SoftStep-feature both kinds of clicks could be reduced to a minimum and are no more audible. Eight programmable softstep time from one step to the next are user selectable. Figure 8. SoftStep timing VOUT 1dB 0.
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Description of the audioprocessor 4.6.2 TDA7418 Center frequency Figure 10 shows the four possible center frequencies 60, 80, 100 and 200Hz. Figure 10. Bass center frequencies @ Gain = 15dB, Q = 1 4.6.3 Quality factors Figure 11 shows the four possible quality factors 1, 1.25, 1.5 and 2. Figure 11. 4.6.4 Bass quality factors @ Gain = 14dB, fC = 80Hz DC mode In this mode the DC-gain is increased by 4.4dB.
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TDA7418 4.7 Description of the audioprocessor Middle There are three parameters programmable in the middle stage: 4.7.1 Attenuation Figure 13 shows the attenuation as a function of frequency at a center frequency of 1kHz. Figure 13. Middle control @ fC = 1 kHz, Q = 1 4.7.2 Center frequency Figure 14 shows the four possible center frequencies 500Hz, 1kHz, 1.5kHz and 2.5kHz. Figure 14. Middle center frequencies @ Gain = 14dB, Q = 1 4.7.
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Description of the audioprocessor 4.8 TDA7418 Treble There are two parameters programmable in the treble stage: 4.8.1 Attenuation Figure 16 shows the attenuation as a function of frequency at a center frequency of 17.5kHz. Figure 16. Treble control @ fC = 17.5 kHz 4.8.2 Center frequency Figure 17 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz. Figure 17. Treble center frequencies @ Gain = 14dB 4.
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TDA7418 4.11 Description of the audioprocessor MUX output It provides a mono signal output (before tone filters) at Mute/MUX pin, used for external level meter / spectrum analyzer. The mute pin can be configured as MUX output (I2C Byte13_D7D1). When it is configured as MUX output, the output voltage is (InGainL+InGainR)/2 with -3dB attenuation. Figure 18. MUX output configuration InGainL + MUTE/MUX = (InGainL+InGainR)/2 * (-3dB) AC00059 InGainR 4.
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I2C bus specification TDA7418 5 I2C bus specification 5.1 Interface protocol The interface protocol comprises: – 5.1.1 S a start condition (S) – a chip address byte (the LSB determines read/write transmission) – a subaddress byte – a sequence of data (N-bytes + acknowledge) – a stop condition (P) – the max.
PAGE 21
I2C bus specification TDA7418 5.2 Subaddress (receive mode) Table 6.
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I2C bus specification 5.3 TDA7418 Data byte specification Table 7. Input selector /gain (0) MSB LSB Function D7 D6 0 0 : 1 1 D5 0 0 : 1 1 D4 0 0 : 1 1 D3 D2 D1 D0 0 0 0 0 1 0 0 1 1 X 0 1 0 1 X Source Selector PD/SE4 SE1 SE2 SE3 mute Input Gain 0dB 1dB : 14dB 15dB 0 1 : 0 1 Diffin Mode Single Ended Stereo Differential Stereo 0 1 Table 8.
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I2C bus specification TDA7418 Table 9. Volume / speaker attenuation (2,7,8,9,10,11) MSB LSB Function D7 D6 D5 D4 D3 D2 D1 D0 0 0 : 0 0 0 0 : 0 0 : 1 1 1 0 0 : 0 0 0 0 : 0 1 : 0 0 1 0 0 : 0 0 1 1 : 1 0 : 1 1 x 1 1 : 0 0 0 0 : 1 0 : 1 1 x 1 1 : 0 0 0 0 : 1 0 : 1 1 x 1 1 : 0 0 0 0 : 1 0 : 1 1 x 1 0 : 1 0 0 1 : 1 0 : 0 1 x Gain/Attenuation +15dB +14dB : +1dB 0dB 0dB -1dB : -15dB -16dB : -78dB -79dB Mute Volume Soft Step on off 0 1 Table 10.
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I2C bus specification TDA7418 Table 11. Middle filter (4) MSB LSB Function D7 D6 0 0 1 1 0 1 24/29 D5 0 1 0 1 D4 D3 D2 D1 D0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 Gain/Attenuation -15dB -14dB : -1dB 0dB 0dB +1dB : +14dB +15dB Middle Q Factor 0.5 0.75 1 1.
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I2C bus specification TDA7418 Table 12. Bass filter (5) MSB LSB Function D7 D6 0 0 1 1 D5 D4 D3 D2 D1 D0 0 0 : 0 0 1 1 : 1 1 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 0 : 1 1 1 1 : 0 0 0 1 : 0 1 1 0 : 1 0 Gain/Attenuation -15dB -14dB : -1dB 0dB 0dB +1dB : +14dB +15dB Bass Q Factor 1.0 1.25 1.5 2.0 0 1 0 1 Bass Soft Step on off 0 1 Table 13.
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I2C bus specification TDA7418 Table 14. Soft mute and soft step time (12) MSB D7 LSB D6 D5 D4 D3 D2 D1 D0 0 1 0 0 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 X 0 1 0 1 0 1 0 1 0 1 X Table 15. LSB D6 D5 D4 D3 D2 D1 D0 0 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 x 0 1 0 1 1 26/29 Soft Mute on off Soft Mute Time 0.48ms 0.96ms 123ms Soft Step Time 0.16ms 0.32ms 0. 64ms 1.28ms 2.56ms 5.12ms 10.24ms 20.
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TDA7418 6 Package information Package information In order to meet environmental requirements, ST (also) offers these devices in ECOPACK® packages. ECOPACK® packages are lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 19.
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Revision history 7 TDA7418 Revision history Table 16. 28/29 Document revision history Date Revision Changes 15-Feb-2007 1 Initial release. 23-Oct-2008 2 Updated Table 6: Subaddress (receive mode) on page 21. 03-Nov-2008 3 Corrected Table 6: Subaddress (receive mode) on page 21. 23-Sep-2013 4 Updated Disclaimer.
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TDA7418 Please Read Carefully: 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.