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TDA7418STN/a4544avai3 BAND CAR AUDIO PROCESSOR
TDA7418STMN/a770avai3 BAND CAR AUDIO PROCESSOR
TDA7418TRSTN/a1000avai3 BAND CAR AUDIO PROCESSOR


TDA7418 ,3 BAND CAR AUDIO PROCESSORBlock diagram . . . . . . 62 Pin description . . . . . 72.1 Connection diagram . . ..
TDA7418 ,3 BAND CAR AUDIO PROCESSORElectrical characteristics . . . . 8Table 5. Registers of all subaddresses . . . . . . . ..
TDA7418TR ,3 BAND CAR AUDIO PROCESSORFeatures• Input multiplexer– PD/SE4: pseudo differential stereo input, programmable as single-ended ..
TDA7419 ,3 BAND CAR AUDIO PROCESSORFeatures:Input Multiplexer QD / SE: quasi-differential stereo inputs, with selectable single-ended ..
TDA7419TR ,3 BAND CAR AUDIO PROCESSORAbsolute Maximum RatingsSymbol Parameter Value UnitV Operating Supply Voltage 10.5 VsT Operating Te ..
TDA7420 ,MULTIFUNCTION AUDIO PROCESSORTDA7420®MULTIFUNCTION AUDIO PROCESSORCASSETTE PREAMPLIFIER:FORWARD/REVERSE INPUTS GROUNDCOMPATIBLEI ..
THN6501E , NPN SiGe RF TRANSISTOR
THN6501E , NPN SiGe RF TRANSISTOR
THN6501F , SiGe NPN Transistor
THN6501S , NPN SiGe RF TRANSISTOR
THS0842 ,8-Bit, 40 MSPS ADC Dual Ch. (Config.), Dual Simultaneous S&H, Low Power, PowerDownblock diagramAVDDDRV DVDD DDCOUTCLK Timing CircuitryCOUTI +Sample& HoldI –DA(7–0)3-State8 BITBUSMUX ..
THS0842IPFB ,8-Bit, 40 MSPS ADC Dual Ch. (Config.), Dual Simultaneous S&H, Low Power, PowerDownTHS0842 DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTERWITH SINGLE OR DUAL PARALLE ..


TDA7418-TDA7418TR
3 BAND CAR AUDIO PROCESSOR
September 2013 Rev 4 1/29TDA7418
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.

Table 1. Device summary
Contents TDA7418
2/29
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.2 Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.3 Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.4 Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 SoftStep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.9 Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TDA7418 Contents
3/29
4.10 Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11 MUX output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.1 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.2 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
List of tables TDA7418
4/29
List of tables

Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Registers of all subaddresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 6. Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 7. Input selector /gain (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 8. Loudness (1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 9. Volume / speaker attenuation (2,7,8,9,10,11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 10. Treble filter (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 11. Middle filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 12. Bass filter (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 13. Middle / bass Fc select (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 14. Soft mute and soft step time (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 15. Testing audio processor (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 16. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TDA7418 List of figures
5/29
List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4. Loudness attenuation @ fC = 400Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5. Loudness center frequencies @ Attn. = 15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6. Loudness attenuation, fc = 2.4kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7. Softmute timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8. SoftStep timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9. Bass control @ fC = 80Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10. Bass center frequencies @ Gain = 15dB, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. Bass quality factors @ Gain = 14dB, fC = 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12. Bass normal and DC mode @ Gain = 14dB, fC = 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 13. Middle control @ fC = 1 kHz, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 14. Middle center frequencies @ Gain = 14dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 15. Bass quality factors @ Gain = 14dB, fC = 1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 16. Treble control @ fC = 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 17. Treble center frequencies @ Gain = 14dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 18. MUX output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19. SO20 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Block diagram TDA7418
1 Block diagram
Figure 1. Block diagram
TDA7418 Pin description
7/29
2 Pin description
2.1 Connection diagram
Figure 2. Pin out
2.2 Pin list


Table 2. Pin list
Electrical specification TDA7418
8/29
3 Electrical specification
3.1 Absolute maximum ratings


3.2 Electrical characteristics


Table 3. Absolute maximum ratings
Reference level is GND.
Table 4. Electrical characteristics
S = 8.5 V; T amb = 25 °C; RL = 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified
TDA7418 Electrical specification
9/29
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
Electrical specification TDA7418
10/29
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
TDA7418 Electrical specification
11/29 Min. and max. values are calculated according to simulation results; functionality is guaranteed by measuring a directly correlated parameter.
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
Description of the audioprocessor TDA7418
12/29 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. It is also configurable as single-ended input.
Single-ended stereo input (SE1, SE2, SE3)

The input-impedance at each input is 100k and the attenuation is fixed to -3dB for
incoming signals.
Figure 3. Input stage
4.2 AutoZero

The AutoZero allows a reduction of the number of pins as well as external components by
canceling any offset generated by or before the In-Gain-stage (Please notice that externally
generated offsets, e.g. generated through the leakage current of the coupling capacitors,
are not canceled).
The auto-zeroing is started every time the input source is changed and needs max. 0.6ms
for the alignment. To avoid audible clicks the Audio processor is muted before the loudness
stage during this time.
AutoZero-remain

In some cases, for example if the µP is executing a refresh cycle of the IIC-Bus-
programming, it is not useful to start a new AutoZero-action because no new source is
TDA7418 Description of the audioprocessor
13/29
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. Loudness attenuation @ fC = 400Hz.
4.3.2 Peak frequency

Figure 5 shows the four possible peak-frequencies at 400, 800 and 2400Hz
Figure 5. Loudness center frequencies @ Attn. = 15dB
Description of the audioprocessor TDA7418
14/29
4.3.3 Low and high frequency boost

Figure 6 shows the different Loudness shapes in low & high frequency boost.
Figure 6. Loudness attenuation, fc = 2.4kHz
4.3.4 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 I2 C-bus
programmable slope. The mute process can either be activated by the SoftMute pin or by
the I2 C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure7).
For timing purposes the Bit0 of the I2 C-bus output register is set to 1 from the start of muting
until the end of demuting.
Figure 7. Softmute timing
Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute-signal
TDA7418 Description of the audioprocessor
15/29
4.5 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
For steps more than 1dB the SoftStep mode should be deactivated because it could generate 1dB error step during the blend-time.
4.6 Bass

There are four parameters programmable in the bass stage:
4.6.1 Attenuation

Figure 9 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 9. Bass control @ fC = 80Hz, Q = 1
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