TDA7412 Fast Delivery |IC PHOENIX CO.,LIMITED

TDA7412 ,CARRADIO SIGNAL PROCESSORTDA7412CARRADIO SIGNAL PROCESSOR■ 3 STEREO INPUTS■ 3 MONO INPUTS■ DYNAMIC-COMPRESSION-STAGE FOR CD■ ..
TDA7415CB ,Car radio multimedia signal processorAbsolute maximum ratings . 11Table 6. Input section . . . . 11Table 7. Main signal pro ..
TDA7415CB ,Car radio multimedia signal processorAbsolute maximum ratings . . . . 114.3 Electrical characteristcs . . . . . . 114.3.1 Input ..
TDA7416 ,CARRADIO SIGNAL PROCESSORFEATURESInput multiplexer– 1 pseudo differential CDC stereo input, programmable as single-ended inp ..
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THN4201U , NPN SiGe RF TRANSISTOR
THN4201U , NPN SiGe RF TRANSISTOR
THN5601B , NPN SiGe RF POWER TRANSISTOR
THN5601B , NPN SiGe RF POWER TRANSISTOR
THN5601B , NPN SiGe RF POWER TRANSISTOR
THN5601SF , NPN SiGe RF POWER TRANSISTOR

TDA7412
CARRADIO SIGNAL PROCESSOR
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TDA7412
October 2003 3 STEREO INPUTS 3 MONO INPUTS DYNAMIC-COMPRESSION-STAGE FOR CD SOFTSTEP-VOLUME BASS, TREBLE AND LOUDNESS CONTROL VOICE-BAND-FILTER DIRECT MUTE AND SOFTMUTE INTERNAL BEEP FOUR INDEPENDENT SPEAKER-OUTPUTS STEREO SUBWOOFER OUTPUT INDEPENDENT SECOND SOURCE-
SELECTOR FULL MIXING CAPABILITY PAUSE DETECTOR
Stereodecoder: RDS MUTE NO EXTERNAL ADJUSTMENTS AM/FM NOISEBLANKER WITH SEVERAL
TRIGGER CONTROLS PROGRAMMABLE MULTIPATH DETECTOR QUALITY DETECTOR OUTPUT
Digital Control:2 C-BUS INTERFACE
DESCRIPTION
The device includes a high performance audiopro-
cessor and a stereodecoder-noiseblanker combina-
tion with the whole low frequency signal processing
necessary for state-of-the-art as well as future carra-
dios. The digital control allows a programming in a
wide range of all the filter characteristics. Also the
stereodecoder part offers several possibilities of pro-
gramming especially for the adaptation to different
IF-devices.
CARRADIO SIGNAL PROCESSOR
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PIN CONNECTION (Top view)
ESD:
All pins are protected against ESD according to the MIL883 standard.
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
SUPPLY
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BLOCK DIAGRAM
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Audioprocessor Part Features:
Input Multiplexer 2 fully differential CD stereo inputs with programmable attenuation
1 single-ended stereo input
2 differential mono input
1 single-ended mono input
In-Gain 0..15dB, 1dB steps
internal Offset-cancellation (AutoZero)
separate second source-selector
Beep internal Beep with 4 frequencies
Mixing stage Beep, Phone and Navigation mixable to all speaker-outputs
Loudness programmable center frequency and frequency response
15 x 1dB steps
selectable flat-mode (constant attenuation)
Volume 0.5dB attenuator
100dB range
soft-step control with programmable times
Compander dynamic range compression for use with CD
2:1 compression rate
programmable max. gain
Bass 2nd order frequency response
center frequency programmable in 8 steps
DC gain programmable
+ 15 x 1dB steps
Treble 2nd order frequency response
center frequency programmable in 4 steps
+15 x 1dB steps
Voice Bandpass 2nd order butterworth highpass filter with programmable cut-off frequency
2nd order butterworth lowpass filter with programmable cut-off frequency
selectable flat-mode
Speaker 4 independent speaker controls in 1dB steps
control range 95dB
separate Mute
Subwoofer single-ended stereo output
independent stereo level controls in 1dB steps
control range 95dB
separate Mute
Mute Functions direct mute
digitally controlled SoftMute with 4 programmable mute-times
Pause Detector programmable threshold
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ELECTRICAL CHARACTERISTICS
VS = 9V; Tamb = 25°C; RL = 10kΩ; all gains = 0dB; f = 1kHz; unless otherwise specified
INPUT SELECTOR
DIFFERENTIAL STEREO INPUTS
DIFFERENTIAL MONO INPUTS
BEEP CONTROL
MIXING CONTROL
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MULTIPLEXER OUTPUT 1
LOUDNESS CONTROL
VOLUME CONTROL
SOFT MUTE
ELECTRICAL CHARACTERISTICS (continued)
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Notes:1. If configured as Multiplexer-Output The SM-Pin is active low (Mute = 0)
BASS CONTROL
TREBLE CONTROL
ELECTRICAL CHARACTERISTICS (continued)
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PAUSE DETECTOR1
SPEAKER ATTENUATORS
Notes:1. If configured as Pause-Output
AUDIO OUTPUTS
VOICE BANDPASS
ELECTRICAL CHARACTERISTICS (continued)
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SUBWOOFER ATTENUATORS
SUBWOOFER Lowpass
Notes:1. If programmed as Subwoofer Diff.-Output
DIFFERENTIAL OUTPUTS1)
Notes:1. If programmed as Subwoofer Diff.-Output
ELECTRICAL CHARACTERISTICS (continued)
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ELECTRICAL CHARACTERISTICS (continued)
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1.0 DESCRIPTION OF THE AUDIOPROCESSOR PART
1.1 Input stages
In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single-
ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present.
Figure 1. Input-stages
Full-differential stereo Input 1 (FD1)
The FD1-input is implemented as a buffered full-differential stereo stage with 100kΩ input-impedance at each
input. The attenuation is programmable in 3 steps from 0 to -12dB in order to adapt the incoming signal level.
A 6dB attenuation is included in the differential stage, the additional 6dB are done by a following resistive divid-
er. This input is also configurable as two single-ended stereo inputs (see pin-out).
Full-differential stereo Input 2 (FD2)
The FD2-input has the same general structure as FD1, but with a programmable attenuation of 0 or 6dB em-
bedded in the differential stage.
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Mono-differential Input 1 (MD1)
The MD1-input is designed as a basic differential stage with 56kΩ input-impedance. This input is configurable
as a single-ended stereo input (see pin-out).
Mono-differential Input 2 (MD2)
The MD2-input has the same topology as MD1, but without the possibility to configure it to single ended.
Single-ended stereo Input (SE1), single-ended mono input (AM) and FM-MPX input
All single ended inputs offer an input impedance of 100kΩ. The AM-pin can be connected by software to the
input of the stereo-decoder in order to use the AM-noiseblanker and AM-High-Cut feature.
1.2 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 DATA-BYTE 0 is selected and needs max. 0.3ms for the alignment.
To avoid audible clicks the Audioprocessor is muted before the loudness stage during this time. The AutoZero-
feature is only present in the main signal-path.
AutoZero for Stereodecoder-Selection
A special procedure is recommended for selecting the stereodecoder at the main input-selector to guarantee
an optimum offset-cancellation:
(Step 0: SoftMute or Mute the signal-path)
The root cause of this procedure is, that after muting the stereodecoder (Step 1), the internal stereodecoder
filters have to settle in order to perform a proper offset-cancellation.
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 selected and an undesired mute would appear at the
outputs. For such applications the A679 could be switched in the AutoZero-Remain-Mode (Bit 6 of the subad-
dress-byte). If this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and the
old adjustment-value remains.
1.3 Pause Detector / MUX-Output
The pin number 40(Pause/MUX) is configurable for two different functions:
1. During Pause-Detector OFF this pin is used as a mono-output of the main input-selector. This signal is often
used to drive a level-/equalizer-display on the carradio front-panel.
2. During Pause-Detector ON the pin is used to define the time-constant of the detector by an external capacitor.
The pause-detector is driven by the internal stereodecoder-outputs in order to use pauses in the FM-signal
for alternate-frequency-jumps. If the signal-level of both stereodecoder channels is outside the programmed
voltage-window, the external capacitor is abruptly discharged. Inside the pause-condition the capacitor is
slowly recharged by a constant current of 25μA. The pause information is also available via IIC-Bus (see IIC-
Bus programming).
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1.4 Loudness
There are four parameters programmable in the loudness stage:
1.4.1 Attenuation
Figure 2 shows the attenuation as a function of frequency at fP = 400Hz
Figure 2. Loudness Attenuation @ fP = 400Hz.
1.4.2 Peak Frequency
Figure 3 shows the four possible peak-frequencies at 200, 400, 600 and 800HzFigure 3: Loudness Center fre-
quencies @ Attn. = 15dB
Figure 3. Loudness Center frequencies @ Attn. = 15dB.
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1.4.3 Loudness Order
Different shapes of 1st and 2nd-Order Loudness
Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz
1.4.4 Flat Mode
In flat mode the loudness stage works as a 0dB to -19dB attenuator.
1.5 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 spe-
cial S-shaped curve to mute slow in the critical regions (see Figure 5).
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 de-
muting.
Figure 5. Softmute-Timing
Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.
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1.6 SoftStep-Volume and Speaker
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. The
blend-time from one step to the next is programmable in four steps.
Figure 6. SoftStep-Timing
Note: For steps more than 0.5dB (Volume) /1dB (speaker) the SoftStep mode should be deactivated because it could generate a hard
1dB step during the blend-time.
1.7 Bass
There are four parameters programmable in the bass stage:
1.7.1 Attenuation
Figure 7 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 7. Bass Control @ fC = 80Hz, Q = 1
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1.7.2 Center Frequency
Figure 8 shows the eight possible center frequencies 60, 70, 80, 90, 100, 130, 150 and 200Hz.
Figure 8. Bass center Frequencies @ Gain = 14dB, Q = 1
1.7.3 Quality Factors
Figure 9 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 9. Bass Quality factors @ Gain = 14dB, fC = 80Hz
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1.7.4 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 10. Bass normal and DC Mode @ Gain = 14dB, fC = 80Hz
Note: The center frequency, Q and DC-mode can be set fully independently.
1.8 Treble
There are two parameters programmable in the treble stage:
1.8.1 Attenuation
Figure 11 shows the attenuation as a function of frequency at a center frequency of 17.5kHz.
Figure 11. Treble Control @ fC = 17.5kHz
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1.8.2 Center Frequency
Figure 12 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.
Figure 12. Treble Center Frequencies @ Gain = 14dB
1.9 Subwoofer Application
Figure 13. Subwoofer Application with LPF 80/120/160Hz and HPF 90/135/180Hz
Both filters, the lowpass- as well as the highpass-filter, have butterworth characteristic so that their cut-off fre-
quencies are not equal but shifted by the factor 1.125 to get a flat frequency response.
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1.10 Voice-Band Application
Figure 14. VoiceBand Application with HPF 300/450/600/750Hz and LPF 3k/6kHz
1.11 Output Selector
The output-selector allows to connect the main- or the second-source to the Front-, Rear and Subwoofer speak-
er-attenuator, respectively. As an example of this programming the device is able to connect via software the
main-source to the back (rear) and the second-source to the front (see Figure 17). In addition to this stage allows
to setup different applications by IIC-Bus programming. In figure 18 to 20 three examples are given.
Figure 15. Output Selector
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1.12 Subwoofer
Several different applications are possible with the Subwoofer-circuit:
1. Subwoofer-Filter OFF
a. Main-source stereo (AC-coupled)
b. Second-source stereo (DC-coupled)
c. Main-source mono-differential (DC-coupled)
d. Second-source mono-differential (DC-coupled)
2. Subwoofer-Filter ON
a. Main-source mono-differential (DC-coupled)
b. Second-source mono-differential (DC-coupled)
c. Center-Speaker-Mode (filtered mono signal at SWL, unfiltered mono signal at SWR)
In all applications the phase of the output-signal can be configured to be 0° or 180° . In the Center-Speaker-
Mode only at the filtered output the phase is changed.
Figure 16. Application1 using internal Highpass- and mono Low-pass-Filter
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Figure 17. Application2 using internal Highpass- and external stereo Low-pass-Filter
Figure 18. Application3 using pure external Filtering (e.g. DSP)
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1.13 Speaker-Attenuator and Mixing
A Mixing-stage is placed after each speaker-attenuator and can be set independly to mixing-mode. Having a full
volume for the Mix-signal the stage offers a wide flexibility to adapt the mixing levels.
Figure 19. Output Selector
1.14 Audioprocessor Testing
During the Testmode, which can be activated by setting bit D0 of the stereodecoder testing-byte and the audio-
processor testing byte, several internal signals are available at the FD2R- pin. During this mode the input re-
sistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-byte
specification.
2.0 STEREODECODER PART
2.1 FEATURES: 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 Roll-Off compensation dedicated RDS-Softmute Highcut- and Stereoblend-characterisctics programmable in a wide range FM/AMNoiseblanker with several threshold controls Multipath-detector with programmable internal/external influenceI2 C-bus control of all necessary functions
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2.2 ELECTRICAL CHARACTERISTICS
VS = 9V, deemphasis time constant = 50μs, MPX input voltage VMPX = 500mV (75kHz deviation), modulation
frequency = 1kHz, input gain = 6dB, Tamb = 27°C, unless otherwise specified.
MONO/STEREO-SWITCH
PLL
DEEMPHASIS and HIGHCUT
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Carrier and harmonic suppression at the output
Intermodulation (Note 2.3.1)
Traffic Radio (Note 2.3.2)
SCA - Subsidiary Communications Authorization (Note 2.3.3)
ACI - Adjacent Channel Interference (Note 2.3.4)
2.2 ELECTRICAL CHARACTERISTICS (continued)
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2.3 NOTES TO THE CHARACTERISTICS
2.3.1 Intermodulation Suppression
measured with: 91% pilot signal; fm = 10kHz or 13kHz.
2.3.2 Traffic Radio (V.F.) Suppression
measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f=57kHz, fm=23Hz AM, m=60%)
2.3.3 SCA ( Subsidiary Communications Authorization )
measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA - subcarrier ( fS = 67kHz, unmodulated ).
2.3.4 ACI ( Adjacent Channel Interference )
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS = 110kHz or 186kHz, un-
modulated).
2.4 NOISE BLANKER PART
2.4.1 Features: AM and FM mode internal 2nd order 140kHz high-pass filter for MPX path internal rectifier and filters for AM-IF path programmable trigger thresholds trigger threshold dependent on high frequency noise with programmable gain additional circuits for deviation- and fieldstrength-dependent trigger adjustment VO signal() at1kHz()O spurious() at1kHz()-------------- --------------- ---------------- -------------------fs ;2 10kHz⋅ () 19kHz–== VO signal() at1kHz()O sp urious() at1kHz()-- --------------- --------------- --------------- -----------------fs; 313kHz⋅ () 38kHz–==
α57 V.W.F() VO signal() at1kHz() spurious() at1kHz 23kHz± ()--------- --------------- -----------------------------------------------------------------=
α67 VO signal() at1kHz()O spurious() at1kHz()---- --------------- --------------- --------------- ---------------fs; 238kHz⋅ () 67kHz–==
α114 VO signal() at1kHz()O spurious() at4kHz()------ --------------- ---------------- --------------- ------------fs; 110kHz 3 38kHz⋅ ()–==
α190 VO signal() at1kHz()O spurious() at4kHz()------ --------------- ---------------- --------------- ------------fs; 186kHz 5 38kHz⋅ ()–==
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2.4.2 ELECTRICAL CHARACTERISTICS
All parameters measured in FM mode if not otherwise specified.
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Notes:
1.All thresholds are measured using a pulse with TR = 2 μs, THIGH= 2 μs and TF = 10 μs. The repetition rate must not increase the
PEAK voltage.
2. By design/characterization functionally guaranteed through dedicated test mode structure
Figure 20. Trigger Threshold vs. VPEAK
2.4.2 ELECTRICAL CHARACTERISTICS (continued)
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Figure 21. Fig. 23: Deviation Controlled Trigger Adjustment
Figure 22. Fieldstrength Controlled Trigger Adjustment

Partno	Mfg	Dc	Qty	Available	Descript
TDA7412	ST	N/a	1197	avai	CARRADIO SIGNAL PROCESSOR