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TDA7434 Datasheet(PDF) 8 Page - STMicroelectronics

No. de pieza TDA7434
Descripción Electrónicos  BASIC FUNCTION AUDIO PROCESSOR
Download  10 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7434 Datasheet(HTML) 8 Page - STMicroelectronics

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Loudness
MSB
LSB
LOUDNESS
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D0
0dB
-1dB
-2dB
:
-3dB
-4dB
-5dB
-6dB
-7dB
-8dB
-9dB
-10dB
-11dB
-12dB
-13dB
-14dB
-15dB
Loudness flat (Note 3)
For example to select -14dB Loudness the Data Byte is : X X X 01110.
Note 3:
FIat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to ”0”. In this
case the attenuation is 0dB independent from the loudness settings.
Functional Description
The input selector is able to select 2 stereo inputs
and 1 mono input (AM). The inputs are DC biased
with a 100k
Ω resistors to the internal reference
voltage of 3V. The AM input can be used addi-
tionally as hardware mute pin. If this pin is pulled
to ground by an external transistors and AM is not
selected, the input selector mutes the input (refer-
ence voltage selected). The AM part is consid-
ered to be switched OFF. If the output of the AM
part is not high ohmic in this condition, a series
resistor of about 20k
Ω has to be foreseen.
The volume control can be programmed from a
gain of +32dB to an attenuation of -79dB in 1dB
steps. The maximum gain should be kept as low
as possible for system performance reason. It has
to be limited by software to the absolute neces-
sary system gain, depending on the signal source
level and the power amplifier gain.
The bass control acts in a range from +18dB to -
18dB in 2dB steps. The filter response is deter-
mined by the external filter components. An ex-
tensive simulation software is available in order to
support the design of the bass filter response with
different filter configurations.
The extended bass boost range of +18dB allows
the implementation of the software loudness func-
tion by additional bass and treble boost.
The treble control acts in a range of
±14dB in 2dB
steps. The external capacitor determines with the
internal resistor of 50K
Ω the corner frequency of
the treble response.
The four speaker attenuators can be controlled in-
dependently from 0 to -37.5dB, which allows the
implementation of balance and fader for a four
speaker system. The attenuation steps size is 1
db from 0 to -24dB and increases nonlinearly up
to the maximum attenuation of 37.5dB. A special
mute bit forces the speaker attenuator into the
mute position.
All 4 outputs are low distortion push pull outputs,
able to drive a load of 3k
Ω.
TDA7434
8/10


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