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PDF TDA7410ND Data sheet ( Hoja de datos )

Número de pieza TDA7410ND
Descripción Signal processor
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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TDA7410ND
Signal processor for car radio applications
Features
Device Includes Audio Processor, Stereo
Decoder And Noiseblanker
No External Components Required
Fully Programmable Via I2C Bus
Softstep Volume and Bass
Low Distortion
Low Noise
SO20 Package
Description
TDA7410ND is a signal processor specifically
designed for car radio applications. The device
includes a complete audioprocessor and a stereo
decoder with noiseblanker, stereoblend and all
signal processing functions for car radio system.
SO20
Switched-capacitors design technique allows the
users to enjoy these features without external
components or adjustments. This means higher
quality and reliability as well as overall cost
saving.
The device is fully programmable by I2C bus
interface allowing customization of key device
parameters, especially filter characteristics..
Table 1. Device summary
Part number
Package
Packing
TDA7410ND
TDA7410NDTR
SO20
SO20
Tube
Tape and reel
February 2007
Rev 2
1/34
www.st.com
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TDA7410ND
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Soft Step Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Bass control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Bass normal and DC mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Treble Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Vn timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Trigger Threshold vs. VPEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Deviation Controlled Trigger Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fieldstrength Controlled Trigger Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Block diagram of the stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Internal stereoblend characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Relation between internal and external LEVEL voltage and setup of Stereoblend . . . . . . 21
Highcut characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Block diagram of the noiseblander . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SO20 Mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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TDA7410ND
Description of the audioprocessor part
5 Description of the audioprocessor part
5.1
Input matrix
The input matrix of the TDA7410ND offers several possibilities to adapt the audioprocessor
to the desired application (see Figure 1). Into the standard application we have:
CD quasi differential
Cassette stereo
Phone
AM mono
Stereodecoder input
Figure 3. Input Stage
CD
CDGND
100K
100K
-
+
CASSETTE
PHONE
AM
MPX
100K
100K
100K
100K
STEREODECODER
IN GAIN
D05AU1613
5.2 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. To avoid audible clicks the audioprocessor is muted
before the volume stage during this time. In some cases, for example if the P is executing a
refresh cycle of the I2C 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 TDA7410D could be switched in the "Auto Zero Remain" mode (Bit 6
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.
11/34

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