TDA7409D-TDA7409DTR Fast Delivery |IC PHOENIX CO.,LIMITED

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TDA7409D-TDA7409DTR
CARRADIO-SIGNAL-PROCESSOR
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TDA7409
September 2003 4 STEREO INPUTSSOFTSTEP-VOLUME BASS, TREBLE AND LOUDNESS CONTROL DIRECT MUTE AND SOFTMUTE INTERNAL BEEP FOUR INDEPENDENT SPEAKER-OUTPUTS SUBWOOFER STEREO OUTPUT DIGITAL CONTROL:I2 C-BUS INTERFACE
� AUDIO-FILTER CHARACTERISTICS
PROGRAMMABLE
DESCRIPTION
The TDA7409 is a high performance signal proces-
sor specificall designed for car radio applications.
The device includes a high performance audiopro-
cessor with fully integrated audio filters. The digital
control allows a programming in a wide range of all
the filter characteristics. By the use of a BICMOS-
process and a linear signal processing low distortion
and low noise are obtained.
CARRADIO-SIGNAL-PROCESSOR
BLOCK DIAGRAM
TDA7409
2/25
SUPPLY
THERMAL DATA
ABSOLUTE MAXIMUM RATINGS
ESD
All pins are protected against ESD according to the MIL883 standard.
PIN CONNECTION
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TDA7409
FEATURES:
Input Multiplexer 4 single-end stereo inputs
In-Gain 0..14dB, 1dB steps, 14..20dB, 2dB steps
Auto Zero
Beep internal Beep with 3 frequencies
781Hz/1.56KHz/1.8KHz
Mixing stage 4 step-mixing-stage with mono or beep as mix-signals
Loudness second order frequenciy response
programmable center frequency
15 x 1dB steps
selectable low & high frequency boost
selectable flat-mode (constant sttenuation)
Volume 1 dB attenuator
100dB range
soft-step control with programmable times
Bass 2nd 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
Treble 2nd order frequency response
center frequency programmable in 4 steps
10KHz/12.5KHz/15KHz/17.5KHz
+15dB x 1dB steps
Speaker 4 independent speaker controls in 1dB steps
control range 50dB with mute
Zero crossing attenuate
Subwoofer Stereo output
attenuator range 50dB
Mute Functions direct mute
digitally controlled Soft Mute with 4 programmable mute-times
TDA7409
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ELECTRICAL CHARACTERISTICS (VS =9V; TAMB=25 ;RL=10kΩ; all gains = 0dB; f = 1kHz; unless otherwise
specified)
INPUT SELECTOR
BEEP CONTROL
MIXING CONTROL
VOLUME CONTROL
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TDA7409
LOUDNESS CONTROL
SOFT MUTE
SOFT STEP
1) Center frequency 2.4KHz makes 1KHz bottom frequency at low & high frequency boost condition.
2) The SM-Pin is active low (Mute = 0)
BASS CONTROL
ELECTRICAL CHARACTERISTICS (continued)
TDA7409
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TREBLE CONTROL
SPEAKER ATTENUATORS
FADER OUTPUTS
SUBWOOFER ATTENUATORS
ELECTRICAL CHARACTERISTICS (continued)
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TDA7409
1.0 DESCRIPTION OF FUNCTIONALITY
1.1 Input stages
The input stages have remained the same as in preceding ST-Audioprocessors.
Figure 1. Input-stages
GENERAL
ELECTRICAL CHARACTERISTICS (continued)
TDA7409
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1.2 AutoZero
In order to reduce the number of pins there is no AC 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 amplified to the output.
To avoid that effect a special Offset-cancellation-stage called AutoZero is implemented. This stage is located
before the Mixing-block to eliminate all offsets generated by the Input-Stages and the In-Gain (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 (Input Selector/Gain) is selected and takes a time of
max. 0.3ms. To avoid audible clicks the Audioprocessor is muted before the loudness stage during this time.
1.2.1 AutoZero-Remain
In some cases, for example if the uP 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 TDA7409 could be switched in the AutoZero-Remain-Mode (I2 bit of the
subaddress-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 Mixing Stage
The 4 step Mixing stage offers the possibility to mix the rear selector signal or the phone signal to any other
source. Due to the fact that the mixing-stage is located behind the In-Gain-stage fine adjustments of the main
source level could be done in this way.
Figure 2. Signal-Flow of Mixing-Stage
1.4 Loudness
There are four parameters programmable in the loudness stage:
1.4.1 Attenuation
Figure 3 shows the attenuation as a function of frequency at fC = 400Hz.
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TDA7409
Figure 3. Loudness Attenuation @ fC = 400Hz
1.4.2 Center Frequency
Figure 4 shows the three possible peak-frequencies 400Hz , 800Hz and 2.4kHz.
Figure 4. Loudness Center frequencies @ Attn. = 15dB
TDA7409
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1.4.3 Low & High Frequency Boost
Figure 5 shows the different Loudness-shapes in low & high frequency boost.
Figure 5. Loudness Attenuation , fC = 2.4KHz
1.5 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 Mute 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 6).
For timing purposes the Bit 0 of the I2C-bus output register is set to 1 from the start of muting until the end of
de-muting.
Figure 6. 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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TDA7409
1.6 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. Four
programmable soft step time from one step to the next, are user selectable.
Figure 7. SoftStep-Timing
Note: For steps more than 1dB the SoftStep mode should be deactivated because it could generate a 1dB error during the blend-time.
1.7 Bass
There are three parameters programmable in the bass stage:
1.7.1 Attenuation
Figure 8 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 8. Bass Control @ fC = 80Hz, Q = 1
TDA7409
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1.7.2 Center Frequency
Figure 9 shows the four possible center frequencies 60, 80 ,100 and 200Hz.
Figure 9. Bass center Frequencies @ Gain = 15dB, Q = 1
1.7.3 Quality Factors
Figure 10 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 10. Bass Quality factors @ Gain = 14dB, fC = 80Hz
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TDA7409
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 11. 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 12 shows the attenuation as a function of frequency at a center frequency of 17.5kHz.
Figure 12. Treble Control @ fC = 17.5kHz

Partno	Mfg	Dc	Qty	Available	Descript
TDA7409D	ST	N/a	308	avai	CARRADIO-SIGNAL-PROCESSOR
TDA7409DTR	ST	N/a	289	avai	CARRADIO-SIGNAL-PROCESSOR