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TDA7418
3 Band car audio procesor
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 (400Hz/800Hz/2400Hz) - 15dB with 1dB steps - selectable low & 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 (60Hz/80Hz/100Hz/200Hz) - 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 (500Hz/1KHz/1.5KHz/2.5KHz) Device summary
Temp range, C -40 to +85 -40 to +85
SO20
- 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 (10KHz/12.5KHz/15KHz/17.5KHz) - -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 mutetimes(0.48ms/0.96ms/123ms)

Description
The TDA7418 includes a high performance audio procesor with fully integrated 3-Band filters to processs signals at audible frequencies. The digital control allows a full programming of the audioprocessor and filters characteristics..
Table 1.
Part number TDA7418 TDA7418TR
Package SO20 SO20
Packing Tube Tape and reel
February 2007
Rev 1
1/29
www.st.com 1
Contents
TDA7418
Contents
1 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 2.2 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 4.2 4.3 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.1 4.3.2 4.3.3 4.3.4 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Low & High frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 4.5 4.6
SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SoftStep-volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.1 4.6.2 4.6.3 4.6.4 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7
Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1 4.7.2 4.7.3 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8
Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1 4.8.2 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.9
Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/29
TDA7418
Contents
4.10 4.11 4.12
Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 MUX output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5
I2C Bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.1 5.1.2 5.1.3 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 5.3
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3/29
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. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Register of all subaddresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Input selector /gain (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Volume / speaker attenuation (2,7,8,9,10,11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Treble filter (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Middle filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Bass filter (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Middle / bass Fc select (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Soft mute and soft step time (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Testing audio processor (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Loudness Attenuation @ fC = 400Hz.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Loudness Center frequencies @ Attn. = 15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Loudness Attenuation, fc = 2.4kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Softmute-Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SoftStep-Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Bass Control @ fC = 80Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Bass center Frequencies @ Gain = 15dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Bass Quality factors @ Gain = 14dB, fC = 80Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Bass normal and DC Mode @ Gain = 14dB, fC = 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Middle Control @ fC = 1 kHz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Middle center Frequencies @ Gain = 14dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Bass Quality factors @ Gain = 14dB, fC = 1kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Treble Control @ fC = 17.5kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Treble Center Frequencies @ Gain = 14dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Mux output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 SO20 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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1
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Block diagram
Figure 1.
MUTE/MUXOUT 17
Block diagram
+
Block diagram
DIFFL
7
DIFFG Loudness SoftMute Treble Middle Bass Softstep Volume
8 16 Softstep Mono Fader OUTLF
DIFFR
9
InGain AutoZero
SE1L
5 13 Softstep Mono Fader OUTRF
SE1R
6
INPUT MULTIPLEXER
SE2L
3 15 Softstep Mono Fader OUTLR
SE2R
4
SE3L
1 14 Softstep Mono Fader OUTRR
SE3R
2
12 MIX Softstep Mono Fader OUTSW
SUPPLY 3 6
DIGITAL CONTROL 18
I CBUS 19 SCL SDA
AC00057
2
7
VDD GND CREF
TDA7418
TDA7418
Pin description
2
2.1
Pin description
Connection diagram
Figure 2. Pin out
SE3L SE3R SE2L SE2R SE1L SE1R DIFFL DIFFG DIFFR CREF 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD SDA SCL MUTE/MUXOUT OUTLF OUTLR OUTRR OUTRF OUTSW GND
AC00058
2.2
Pin list
Table 2.
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Pin list
Pin Name SE3L SE3R SE2L SE2R SE1L SE1R DIFFL DIFFG DIFFR CREF GND OUTSW OUTRF OUTRR OUTLR OUTLF MUTE / MUXOUT SCL SDA VDD Description Single-ended input 3 left channel Single-ended input 3 right channel Single-ended input 2 left channel Single-ended input 2 right channel Single-ended input 1 left channel Single-ended input 1 Right channel Pseudo differential stereo input left Pseudo differential stereo input common Pseudo differential stereo input right Reference capacitor Ground Subwoofer output Front right output Rear right output Rear left output Front left output External mute pin / Mux output I2C bus clock I2C bus data Supply I/O I I I I I I I I I O S O O O O O I I I/O S
7/29
Electrical specification
TDA7418
3
3.1
Electrical specification
Absolute maximum ratings
Table 3.
Symbol VS Top Tstg VESD VESD VESD
Absolute maximum ratings
Parameter Supply voltage for VCC
(1)
Value -0.4 to 10.2 -0.4 to VCC + 0.4 -40 to +85 -55 to +150 2000 200 750
Unit V C C V V V
for other pins Operating temperature range Storage temperature ESD protection (Human Body Model) ESD protection (Machine Model) ESD protection (Change Device Model)
1. Reference level is GND.
3.2
Table 4.
Symbol SUPPLY VS IS
Electrical characteristics
Electrical characteristics VS = 8.5V; Tamb= 25C; RL= 10k; all gains = 0dB; f = 1kHz; unless otherwise specified
Parameter Test Condition Min. Typ. Max. Unit
Supply voltage Supply current
8 18
8.5 25
10 32
V mA
INPUT SELECTOR Rin VCL SIN GIN MIN GIN MAX GSTEP VDC Voffset Input Resistance Clipping level Input Separation Min. Input Gain Max. Input Gain Step Resolution Adjacent Gain Steps DC Steps GMIN to GMAX Remaining offset with AutoZero -30 4 0.5 30 mV mV All single ended inputs 70 1.8 80 -0.5 14 0.5 -5 100 2 100 0 15 1 1 0.5 16 1.5 5 130 k VRMS dB dB dB dB mV
DIFFERENTIAL STEREO INPUTS Rin CMRR Input Resistance Common Mode Rejection Ratio Differential VCM=1 VRMS@ 1kHz VCM=1 VRMS@ 10kHz 70 40 40 100 60 60 130 k dB dB
8/29
TDA7418 Table 4.
Symbol eNo
Electrical specification Electrical characteristics (continued) VS = 8.5V; Tamb= 25C; RL= 10k; all gains = 0dB; f = 1kHz; unless otherwise specified
Parameter Output Noise @ Speaker Outputs Test Condition 20Hz-20kHz,flat; all stages 0dB Min. Typ. 12 Max. 20 Unit V
LOUDNESS CONTROL AMAX Symbol ASTEP Max Attenuation Parameter Step Resolution fP1 fPeak Peak Frequency (1) fP2 fP4 VOLUME CONTROL GMAX AMAX ASTEP EA ET Max Gain Max Attenuation Step Resolution G = -20 to +15dB Attenuation Set Error G = -79 to -20dB Tracking Error Adjacent Attenuation Steps DC Steps From 0dB to GMIN -10 0.5 10 mV -3 0.1 -4 0 3 2 3 dB dB mV 14 -84 0.5 -1 15 -79 1 0 16 -74 1.5 1 dB dB dB dB Test Condition -16 Min. 0.5 360 720 2.1 -15 Typ. 1 400 800 2.4 -14 Max. 1.5 440 880 2.7 dB Unit dB Hz Hz kHz
VDC
SOFT MUTE AMUTE
Mute Attenuation T1
80
100 0.48 0.96 123 0.7
dB ms ms ms V V
TD
Delay Time
T2 T3
VTH Low VTH High RPU VPU
Low Threshold for SM Pin High Threshold for SM Pin Internal pull-up resistor Internal pull-up Voltage 2.7 32 45 3.3
58
k V
BASS CONTROL fC1 fc Center Frequency (1) fC2 fC3 fC4 54 72 90 180 60 80 100 200 66 88 110 220 Hz Hz Hz Hz
9/29
Electrical specification Table 4.
Symbol
TDA7418
Electrical characteristics (continued) VS = 8.5V; Tamb= 25C; RL= 10k; all gains = 0dB; f = 1kHz; unless otherwise specified
Parameter Q1 Test Condition Min. 0.9 1.1 1.3 1.8 14 0.5 DC = off Typ. 1 1.25 1.5 2 15 1 0 3.5 4.4 6 Max. 1.1 1.4 1.7 2.2 16 1.5 dB dB dB dB Unit
QBASS
Quality Factor (1)
Q2 Q3 Q4
CRANGE ASTEP DCGAIN
Control Range Step Resolution Bass-DC-Gain DC = on
MIDDLE CONTROL CRANGE ASTEP Control Range Step Resolution fC1 fc Center Frequency (1) fC2 fC3 fC4 Q1 QBASS Quality Factor (1) Q2 Q3 Q4 TREBLE CONTROL CRANGE ASTEP Clipping Level Step Resolution fC1 fc Center Frequency (1) fC2 fC3 fC4 SPEAKER ATTENUATORS GMAX AMAX ASTEP AMUTE EE Max Gain Max Attenuation Step Resolution Mute Attenuation Attenuation Set Error DC Steps Adjacent Attenuation Steps -5 0.1 14 -84 0.5 80 15 -79 1 90 2 5 16 -74 1.5 dB dB dB dB dB mV 14 0.5 8 10 12 14 15 1 10 12.5 15 17.5 16 1.5 12 15 18 21 dB dB kHz kHz kHz kHz 14 0.5 400 0.8 1.2 2 0.45 0.65 0.9 1.1 15 1 500 1 1.5 2.5 0.5 0.75 1 1.25 16 1.5 600 1.2 1.8 3 0.55 0.85 1.1 1.4 dB dB Hz kHz kHz kHz
VDC
10/29
TDA7418 Table 4.
Symbol Symbol Parameter
Electrical specification Electrical characteristics (continued) VS = 8.5V; Tamb= 25C; RL= 10k; all gains = 0dB; f = 1kHz; unless otherwise specified
Parameter Test Condition Test Condition Min. Min. Typ. Typ. Max. Max. Unit Unit
AUDIO OUTPUTS VCL ROUT RL CL VDC Clipping level Output impedance Output Load Resistance Output Load Capacitor DC Voltage Level 3.8 4.0 2 10 4.2 d = 0.3% 1.8 2 30 100 VRMS k nF V
SUBWOOFER ATTENUATOR GMAX AMAX ASTEP AMUTE EE Max Gain Max Attenuation Step Resolution Mute Attenuation Attenuation Set Error DC Steps Adjacent Attenuation Steps -5 0.1 14 -84 0.5 80 15 -79 1 90 2 5 16 -74 1.5 dB dB dB dB dB mV
VDC
GENERAL eNO S/N D SC
Output Noise Signal to Noise Ratio Distortion Channel Separation left/right
BW=20Hz to 20 kHz all gain = 0dB all gain = 0dB flat; Vo=2VRMS VIN=1VRMS; all stages 0dB 80
12 100 0.005 90
20
V dB
0.100
% dB
1. Min. and max. values are calculated according to simulation results; functionality is guaranteed by measuring a directly correlated parameter.
11/29
Description of the audioprocessor
TDA7418
4
4.1
Description of the audioprocessor
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
QD_L/SE4_L QD_G QD_R/SE4_R
QD/SE4
QD/SE4
Input Selector In Gain
SE1_L SE1_R
SE1
SE1
SE2_L SE2_R
SE2
SE2
SE3_L SE3_R
SE3
SE3
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 P is executing a refresh cycle of the IIC-Busprogramming, it is not useful to start a new AutoZero-action because no new source is
12/29
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. 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
13/29
Description of the audioprocessor
TDA7418
4.3.3
Low & 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 I2C-bus programmable slope. The mute process can either be activated by the SoftMute pin or by the I2C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical regions (see Figure 7). For timing purposes the Bit0 of the I2C-bus output register is set to 1 from the start of muting until the end of demuting. Figure 7. Softmute-Timing
1
EXT. MUTE
+SIGNAL
REF
-SIGNAL
1
2 I C BUS OUT
D97AU634
Time
1. Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute-signal
14/29
TDA7418
Description of the audioprocessor
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 audiosignal. 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
0.5dB
SS Time -0.5dB
Time
-1dB
D00AU1170
1. 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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Description of the audioprocessor
TDA7418
4.6.2
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. Bass Quality factors @ Gain = 14dB, fC = 80Hz
4.6.4
DC mode
In this mode the DC-gain is increased by 4.4dB. In addition the programmed center frequency and quality factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors. Figure 12. Bass normal and DC Mode @ Gain = 14dB, fC = 80Hz
1. The center frequency, Q and DC-mode can be set fully independently.
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TDA7418
Description of the audioprocessor
4.7
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
4.7.3
Quality factors
Figure 15 shows the four possible quality factors 0.5, 0.75, 1 and 1.5. Figure 15. Bass Quality factors @ Gain = 14dB, fC = 1kHz
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Description of the audioprocessor
TDA7418
4.8
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 = 17.5kHz
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
4.9
Speaker attenuator
The four speakers have independent soft step speaker controls. And their attenuators can be adjusted from +15dB to -79dB with 1dB steps.
4.10
Subwoofer attenuator
The Subwoofer output is a single ended mono output. The attenuator is exactly the same like the other speakers.
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TDA7418
Description of the audioprocessor
4.11
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
+
InGainR
MUTE/MUX = (InGainL+InGainR)/2 * (-3dB)
AC00059
4.12
Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the IIC subaddress byte and bit D0 of the testing audioprocessor byte, several internal signals are available at the SE2R pin. In this mode, the input resistance of 100kOhm is disconnected from the pin. Internal signals available for testing are listed in the data-byte specification.
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I2C Bus specification
TDA7418
5
5.1
I2C Bus specification
Interface protocol
The interface protocol comprises: - - - - - - 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. clock speed is 500kbits/s
5.1.1
S 1 0
Receive mode
001 0 0 R/W ACK TS AZ AI A4 A3 A2 A1 A0 ACK DATA ACK P
S=
Start "1" -> Transmission Mode (Data could be received by P)
R/W = "0" -> Receive Mode (Chip can be programmed by P)
ACK = Acknowledge P= Stop
TS = Testing mode AZ = Auto zero remain AI = Auto increment
5.1.2
S 1 0
Transmission mode
0 0 1 0 0 R/W ACK X X X X X X X SM ACK P
SM = Soft mute activated for main channel X = Not Used The transmitted data is automatic updated after each ACK. Transmission can be repeated without new chip address.
5.1.3
Reset condition
A Power-On-Reset is invoked if the Supply-Voltage is below than 2.5V. After that the following data is written automatically into the registers of all subaddresses: Table 5.
MSB 1 1 1 1 1 1 1
Registers of all subaddresses
LSB 0
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TDA7418
I2C Bus specification
5.2
Subaddress (receive mode)
Table 6.
MSB I2 I1 I0 A4 A3 A2 A1
Subaddress (receive mode)
LSB FUNCTION A0 Testing Mode Off On
0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 1 0 1 1 0 0 1 0 1 0 1 0 1
Auto Zero Remain Off On Auto Increment Mode Off On Main Source Selector Loudness Volume Treble Middle Bass Middle/ Bass Fc Select Speaker Attenuator Left Front Speaker Attenuator Left Right Speaker Attenuator Right Rear Speaker Attenuator Right Front Subwoofer Attenuator Soft Mute / Soft Step Testing Audio Processor
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I2C Bus specification
TDA7418
5.3
Data byte specification
Table 7.
MSB D7 D6 D5 D4 D3 D2 D1
Input selector /gain (0)
LSB FUNCTION D0 Source Selector PD/SE4 SE1 SE2 SE3 mute Input Gain 0dB 1dB : 14dB 15dB Diffin Mode Single Ended Stereo Differential Stereo
0 0 0 0 1 0 0 : 1 1 0 1 0 0 : 1 1 0 0 : 1 1 0 1 : 0 1
0 0 1 1 X
0 1 0 1 X
Table 8.
MSB D7 D6
Loudness (1)
LSB FUNCTION D5 D4 D3 D2 D1 D0 Attenuation 0dB -1dB : -14dB -15dB Filter/Center Frequency Off (Flat) D6 must be = 0 400Hz 800Hz 2400Hz Shape Low Boost Low & HighBoost Loudness Soft Step on off
0 0 : 1 1 0 0 0 1 1 0 1 0 1
0 0 : 1 1
0 0 : 1 1
0 1 : 0 1
0 1 0 1
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TDA7418 Table 9.
MSB D7 D6 D5 D4 D3 D2 D1
I2C Bus specification Volume / speaker attenuation (2,7,8,9,10,11)
LSB FUNCTION D0 Gain/Attenuation +15dB +14dB : +1dB 0dB 0dB -1dB : -15dB -16dB : -78dB -79dB Mute Volume Soft Step on off
0 0 : 0 0 0 0 : 0 0 : 1 1 1 0 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
Table 10.
MSB D7 D6
Treble filter (3)
LSB FUNCTION D5 D4 D3 D2 D1 D0 Gain/Attenuation -15dB -14dB : -1dB 0dB 0dB +1dB : +14dB +15dB Treble Center Frequency 10.0kHz 12.5kHz 15.0kHz 17.5kHz Must be "1"
0 0 : 0 0 1 1 : 1 1 0 0 1 1 1 0 1 0 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
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I2C Bus specification Table 11.
MSB D7 D6 D5 D4 D3 D2 D1
TDA7418 Middle filter (4)
LSB FUNCTION D0 Gain/Attenuation -15dB -14dB : -1dB 0dB 0dB +1dB : +14dB +15dB Middle Q Factor 0.5 0.75 1 1.25 Middle Soft Step on off
0 0 : 0 0 1 1 : 1 1 0 0 1 1 0 1 0 1 0 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
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TDA7418 Table 12.
MSB D7 D6 D5 D4 D3 D2 D1
I2C Bus specification Bass filter (5)
LSB FUNCTION D0 Gain/Attenuation -15dB -14dB : -1dB 0dB 0dB +1dB : +14dB +15dB Bass Q Factor 1.0 1.25 1.5 2.0 Bass Soft Step on off
0 0 : 0 0 1 1 : 1 1 0 0 1 1 0 1 0 1 0 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
Table 13.
MSB D7 D6
Middle / bass Fc select (6)
LSB FUNCTION D5 D4 D3 D2 D1 D0 Middle Center Frequency 500Hz 1kHz 1.5kHz 2.5kHz Bass Center Frequency 60Hz 80Hz 100Hz 200Hz Bass DC Mode off on Smoothing Filter off on Not used
0 0 1 1 0 0 1 1 0 1 0 1 X X 0 1 0 1
0 1 0 1
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I2C Bus specification Table 14.
MSB D7 D6 D5 D4 D3 D2 D1
TDA7418 Soft mute and soft step time (12)
LSB FUNCTION D0 0 1 0 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 0 1 X 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 20.48ms AZ function off on Not used
0 1 X
Table 15.
MSB D7 D6
Testing audio processor (13)
LSB FUNCTION D5 D4 D3 D2 D1 D0 0 1 0 0 0 0 1 1 1 1 x 0 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 Audio Processor Testing Mode off on Test Multiplexer InMuxOutR LoudOutR VolumeOutR VBG1.26 REF5V5 SSCLK SMCLK Clk200kHz Not Used SC_clock Normal Fast Mode MUTE Pin Config Mux output External clock Mute (normal)
0 1 1
x 0 1
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TDA7418
Package information
6
Package information
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . 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. SO20 mechanical data and package dimensions
mm DIM. MIN. A A1 B C D (1) E e H h L k ddd 10.0 0.25 0.40 2.35 0.10 0.33 0.23 12.60 7.40 1.27 10.65 0.75 1.27 0.394 0.010 0.016 TYP. MAX. 2.65 0.30 0.51 0.32 13.00 7.60 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 TYP. MAX. 0.104 0.012 0.200 0.013 0.512 0.299 inch
OUTLINE AND MECHANICAL DATA
0 (min.), 8 (max.) 0.10 0.004
(1) "D" dimension does not include mold flash, protusions or gate burrs. Mold flash, protusions or gate burrs shall not exceed 0.15mm per side.
SO20
0016022 D
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Revision history
TDA7418
7
Revision history
Table 16.
Date 15-Feb-2007
Document revision history
Revision 1 Initial release. Changes
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TDA7418
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