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PDF TDA7405 Data sheet ( Hoja de datos )
| Número de pieza | TDA7405 | |
| Descripción | EQUALIZER CARRADIO SIGNAL PROCESSOR | |
| Fabricantes | ST Microelectronics | |
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TDA7405
EQUALIZER CARRADIO SIGNAL PROCESSOR
s 3 STEREO INPUTS
s 3 MONO INPUTS
s DYNAMIC-COMPRESSION-STAGE FOR CD
s BASS, TREBLE AND LOUDNESS CONTROL
s EQ-FILTERS FOR SEPARATE FRONT/REAR-
EQUALIZATION
s VOICE-BAND-FILTER FOR MIXING-CHANNEL
s DIRECT MUTE AND SOFTMUTE
s INTERNAL BEEP
s FOUR INDEPENDENT SPEAKER-OUTPUTS
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
BLOCK DIAGRAM
TQFP44
ORDERING NUMBER: TDA7405
Digital control:
s I2C-BUS INTERFACE
DESCRIPTION
The device includes a high performance audioprocessor
and a stereodecoder-noiseblanker combination with the
whole low frequency signal processing necessary for
state-of-the-art as well as future carradios. The digital
control allows a programming in a wide range of all the
filter characteristics. Also the stereodecoder part offers
several possibilities of programming especially for the
adaptation to different IF-devices.
October 2001
1/56
1 page  
TDA7405
Table 1. ELECTRICAL CHARACTERISTICS
(VS=9V; Tamb=25°C; RL=10kΩ; all gains=0dB; f=1kHz; unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
INPUT SELECTOR
Rin Input Resistance
VCL Clipping Level
SIN Input Separation
GIN MIN Min. Input Gain
GIN MAX Max. Input Gain
GSTEP Step Resolution
VDC DC Steps
Voffset Remaining offset with AutoZero
DIFFERENTIAL STEREO INPUTS
all single ended Inputs
Adjacent Gain Steps
GMIN to GMAX
70
2.2
80
-1
13
0.5
-5
-10
Rin Input Resistance
(see Fig. 1)
Differential
70
GCD Gain
only at true differential input
-1
-5
-11
CMRR Common Mode Rejection Ratio VCM = 1VRMS @ 1kHz
46
VCM = 1VRMS @ 10kHz
eNO Output-Noise @ Speaker-Outputs 20Hz - 20kHz, flat; all stages 0dB
DIFFERENTIAL MONO INPUTS
46
Rin Input Impedance
CMRR Common Mode Rejection Ratio
BEEP CONTROL
Differential
VCM = 1VRMS @ 1kHz
VCM = 1VRMS @ 10kHz
40
46
46
VRMS Beep Level
Mix-Gain = 6dB
250
fBeep Beep Frequency
fBeep1
fBeep2
fBeep3
fBeep4
470
740
1.7
18
1. The Level for the 19kHz-Testtone is 2.1VRMS
MIXING CONTROL
MLEVEL Mixing Ratio
GMAX Max. Gain
Main / Mix-Source
13
AMAX
ASTEP
Max. Attenuation
Attennuation Step
-83
0.5
Typ.
100
2.6
100
0
15
1
1
1
0.5
100
0
-6
-12
70
60
9
56
70
60
3501)
500
780
1.8
19
-6/-6
15
-79
1
Max.
130
+1
17
1.5
5
10
130
1
-7
-13
15
72
500
530
820
1.9
20
17
-75
1.5
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
dB
dB
dB
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5 Page 
TDA7405
2.1.3 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).
2.1.4 Mono-differential Input 2 (MD2)
The MD2-input has the same topology as MD1, but without the possibility to configure it to single ended.
2.1.5 Single-ended stereo Input (SE1), single-ended mono input (AM) and FM-MPX input
All single ended inputs offer an input impedance of 100kW. The AM-pin can be connected by software to the
input of the stereodecoder in order to use the AM-Noiseblanker and AM-High-Cut feature.
2.2 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.
2.2.1 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)
Step 1: Temporary deselect the stereodecoder at all input-selectors
Step 2: Configure the stereodecoder via IIC-Bus
Step 3: Wait 1ms
Step 4: Select the stereodecoder at the main input-selector first
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.
2.2.2 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 A631 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.
2.3 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 ca-
pacitor.
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 volt-
age-window, the external capacitor is abruptly discharged. Inside the pause-condition the capacitor is slowly re-
charged by a constant current of 25µA. The pause information is also available via IIC-Bus (see IIC-Bus
programming).
11/56
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA7405.PDF ] | |
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