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PDF TDA4350X Data sheet ( Hoja de datos )
| Número de pieza | TDA4350X | |
| Descripción | Audioprocessor | |
| Fabricantes | Siemens Semiconductor | |
| Logotipo |  |
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Audioprocessor
TDA 4350X
1 Overview
1.1 Features
Stereo-Soundprocessing
• Three stereo AF inputs, one of the inputs is
equipped with floating ground.
• Input level control for individual level setting of the
P-DSO-28-1
several AF sources in addition with a clipping
detector.
• Volume control with software controlled switchable loudness function. Frequency
response fixed by external components.
• Bass- and treble control with clipping detector.
• Four independent settable output attenuators for balance/fader function.
• Fan-out of the AF outputs software controlled.
• AF outputs switchable for driving bride power amplifiers.
• I2C Bus controlled immediately, or zero cross detector dependent mute, or
immediately mute via extra pin.
Control Part
• I2C Bus interface
• Control of sound processing
• Read out of the clipping detector status.
Type
TDA 4350X
Ordering Code
Q67000-A5060
Package
P-DSO-28-1
1.2 Application
The TDA 4350X is a single-chip audio-soundsystem. The circuit can be partitioned into
two functional blocks: stereo-soundprocessing and control part.
Semiconductor Group
1
04.96
1 page  
TDA 4350X
2 Circuit Description
2.1 Signalprocessing
1. The selection of the AF inputs happens in the input switch. There are three
stereo-inputs available. One of the input pairs is equipped with a separate floating
ground connection especially provided for external signal sources. Crosstalk to this
input is suppressed by common mode rejection. An input level control circuitry behind
input switch realizes the adaption of different signal source levels. The circuit offers a
control range from 0 dB to + 25 dB with a stepwidth of 2.5 dB. An I2C Bus controlled
first clipping detector allows a software controlled level adaption.
2. Next stage in signal path is volume control, with common setting for both channels, a
control range of 0 dB to – 78.75 dB and a stepwidth of 1.25 dB. In this stage a
loudness function is realized. A loudness control circuit, in fact a second volume
control circuit with identical structure, is to be set to a higher level as volume control.
The resulting level difference fixes the maximum amplitude response of the loudness
function. The frequency response, only bass boost or combined bass and treble boost
is fixed by external components. Because the volume and loudness control are strictly
independent of each other, the frequency response and threshold of the loudness
function is programmable via software. A switch bit allows to enable the loudness
function easily. Some possible loudness setups:
Loudness function starting at max.
vol. then ∆ continuously increasing.
Figure 3
Semiconductor Group
5
04.96
5 Page 
TDA 4350X
e) Treble/Bass Control Byte
MSB
LSB
linear
10001000
max. treble, 0 0 0 0 1 0 0 0
lin. bass
min. treble, 1 1 1 1 1 0 0 0
lin. bass
lin. treble,
max. bass
lin. treble,
min. bass
10000000
10001111
max. treble, 0 0 0 0 0 0 0 0
max. bass
min. treble, 1 1 1 1 1 1 1 1
min. bass
power ON
00000001
treble
bass
f ) Output Control Bytes
MSB
LSB
Min. gain
XXXX0 0 0 0
Min. gain + 1 X X X X 0 0 0 1 power ON
Max. gain – 1 X X X X 1 1 1 0
Max. gain
XXXX1 1 1 1
Semiconductor Group
11
04.96
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA4350X.PDF ] | |
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