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TDA7439 Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte TDA7439
Spiegazioni elettronici  Three-band digitally-controlled audio processor
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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Transposing and solving for the external component values we get:
3.1.2
Treble stage
The treble stage is a high-pass filter whose time constant is fixed by an internal resistor
(25 k
Ω typically) and an external capacitor connected between treble pins and ground.
Typical responses are shown in Figure 10 and Figure 11.
3.2
Pin CREF
The suggested value of 10 µF for the reference capacitor (CREF), connected to pin CREF,
can be reduced to 4.7 µF if the application requires faster power-on.
3.3
Electrical characteristics
C1
A
V
1
2
π Fc Ri Q
⋅⋅
------------------------------------------
=
C2
Q
2
C1
A
V
1
Q
2
------------------------------
=
R2
A
V
1
Q
2
2
π C1 Fc A
V
1
() Q
⋅⋅
⋅⋅
----------------------------------------------------------------------
=
Figure 5.
THD vs frequency
Figure 6.
THD vs RLOAD


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