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PDF TDA7409D Data sheet ( Hoja de datos )
| Número de pieza | TDA7409D | |
| Descripción | CARRADIO-SIGNAL-PROCESSOR | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7409
CARRADIO-SIGNAL-PROCESSOR
s 4 STEREO INPUTSSOFTSTEP-VOLUME
s BASS, TREBLE AND LOUDNESS CONTROL
s DIRECT MUTEAND SOFTMUTE
s INTERNAL BEEP
s FOUR INDEPENDENT SPEAKER-OUTPUTS
s SUBWOOFER STEREO OUTPUT
s DIGITAL CONTROL:
q I2C-BUS INTERFACE
q 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-
BLOCK DIAGRAM
SO20
ORDERING NUMBER: TDA7409D
process and a linear signal processing low distortion
and low noise are obtained.
MUTE
SE1L
SE1R
SE2L
SE2R
SE3L
SE3R
SE4L
SE4L
GND
VREF
VS
GAIN/
AUTO
ZERO
INPUT
MULTIPLEXER
MONO/
BEEP
MIXING
STAGE
LOUDNESS VOLUME
BEEP
SOFT
MUTE
TREBLE
BASS
MONO
FADER
MONO
FADER
MONO
FADER
MONO
FADER
MONO
FADER
MONO
FADER
ZERO
CROSS
SUPPLY
DIGITAL CONTROL I2C-BUS
D00AU1178
OUTLF
OUTRF
OUTLR
OUTRR
SWL
SWR
SCL
SDA
September 2003
1/25
1 page  
TDA7409
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Conditions
VDC DC Steps
Adjacent Steps
From 0dB to GMIN
LOUDNESS CONTROL
ASTEP Step Resolution
AMAX Max. Attenuation
fC Center Frequency
Min.
0.5
13
360
720
2.3
SOFT MUTE
AMUTE Mute Attenuation
80
TD Delay Time
T1
T2
T3 20
T4 70
VTH low Low Threshold for SM-Pin2
VTH high High Threshold for SM - Pin
2.50
RPU Internal pull-up resistor
70
VPU Pull-Up Voltage
SOFT STEP
TSW Switch time
TSW1
TSW2
TSW3
TSW4
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
CRANGE Control Range
+14
ASTEP Step Resolution
0.5
fC Center Frequency
fC1
54
fC2 72
fC3 90
fC4 180
Typ.
0.1
0.5
1
15
400
800
2.41
100
0.48
0.96
30.7
123
100
5
0.68
1.26
2.52
5.04
+15
1
60
80
100
200
Max.
3
5
1.5
17
440
880
2.5
1
2
50
170
1
130
+16
1.5
66
88
110
220
Unit
mV
mV
dB
dB
Hz
Hz
kHz
dB
ms
ms
ms
ms
V
V
kΩ
V
ms
ms
ms
ms
dB
dB
Hz
Hz
Hz
Hz
5/25
5 Page 
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
Vout
2dB
1dB
SS Time
-1dB
-2dB
Time
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
15.0
10.0
5.0
dB
0.0
-5.0
-10.0
-15.0
10.0
100.0
Hz 1.0K
10.0K
11/25
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet TDA7409D.PDF ] | |
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