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PDF TDA7412 Data sheet ( Hoja de datos )
| Número de pieza | TDA7412 | |
| Descripción | CARRADIO SIGNAL PROCESSOR | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7412
CARRADIO SIGNAL PROCESSOR
s 3 STEREO INPUTS
s 3 MONO INPUTS
s DYNAMIC-COMPRESSION-STAGE FOR CD
s SOFTSTEP-VOLUME
s BASS, TREBLE AND LOUDNESS CONTROL
s VOICE-BAND-FILTER
s DIRECT MUTE AND SOFTMUTE
s INTERNAL BEEP
s FOUR INDEPENDENT SPEAKER-OUTPUTS
s STEREO SUBWOOFER OUTPUT
s INDEPENDENT SECOND SOURCE-
SELECTOR
s FULL MIXING CAPABILITY
s PAUSE DETECTOR
Stereodecoder:
s RDS MUTE
s NO EXTERNAL ADJUSTMENTS
s AM/FM NOISEBLANKER WITH SEVERAL
TRIGGER CONTROLS
s PROGRAMMABLE MULTIPATH DETECTOR
s QUALITY DETECTOR OUTPUT
TQFP44
ORDERING NUMBER: TDA7412
Digital Control:
I2C-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.
October 2003
1/56
1 page  
TDA7412
ELECTRICAL CHARACTERISTICS
VS = 9V; Tamb = 25°C; RL = 10kΩ; all gains = 0dB; f = 1kHz; unless otherwise specified
Symbol
Parameter
Test Condition
Min. Typ.
INPUT SELECTOR
Rin Input Resistance
all single ended Inputs
70 100
VCL Clipping Level
1.8 2.2
SIN Input Separation
80 100
GIN MIN Min. Input Gain
-1 0
GIN MAX Max. Input Gain
13 15
GSTEP Step Resolution
0.5 1
VDC DC Steps
Adjacent Gain Steps
GMIN to GMAX
-5 1
-10 6
Voffset Remaining offset with AutoZero
0.5
DIFFERENTIAL STEREO INPUTS
Rin Input Resistance
(see Figure 1)
Differential
70 100
GCD Gain
only at true differential input
-1 0
-5 -6
-11 -12
CMRR Common Mode Rejection Ratio VCM = 1VRMS @ 1kHz
46 70
VCM = 1VRMS @ 10kHz
46 60
eNO Output-Noise @ Speaker-Outputs 20Hz - 20kHz, flat; all stages 0dB
9
DIFFERENTIAL MONO INPUTS
Rin Input Impedance
Differential
40 56
CMRR Common Mode Rejection Ratio VCM = 1VRMS @ 1kHz
40 70
VCM = 1VRMS @ 10kHz
40 60
BEEP CONTROL
VRMS Beep Level
Mix-Gain = 6dB
250 350
fBeep Beep Frequency
fBeep1
570 600
fBeep2
740 780
fBeep1
1.48 1.56
fBeep1
2.28 2.4
MIXING CONTROL
MLEVEL Mixing Ratio
Main / Mix-Source
-6/-6
Max.
130
+1
17
1.5
5
10
130
1
7
-13
15
72
500
630
820
1.64
2.52
Unit
kΩ
VRMS
dB
dB
dB
dB
mV
mV
mV
kΩ
dB
dB
dB
dB
dB
µV
kΩ
dB
dB
mV
Hz
Hz
kHz
kHz
dB
5/56
5 Page 
TDA7412
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
SE2
FD1-
STEREO
100K
FD1+
100K
SE3
FD2-
STEREO
100K
FD2+
100K
SE4
MD1G
MONO
100K
MD1
SE4R
MD2G
MONO
100K
100K
MD2
SE1
STEREO
AM
MONO
100K
100K
100K
MPX
100K
15K 15K
1
-
+
1
15K 15K
15K 15K
1
-
+
1
15K 15K
28K 28K
-
+
28K 28K
SE4R
28K 28K
-
+
28K 28K
NOISE BLANKER
+
STEREO DECODER
MAIN SOURCE
SE3 SELECTOR
FD1/SE2
FD2
MD1/SE4
MUTE
MD2
SE1
100K
AM
FM
IN GAIN
MD2
MD1
FM
BEEP
MIXING
SELECTOR
MUTE
MIXING STAGE
SECOND SOURCE
SE3 SELECTOR
FD1/SE2
FD2
MD1/SE4
MUTE
MD2
SE1
AM
FM
IN GAIN
D00AU1142
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.
11/56
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA7412.PDF ] | |
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