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TDA7439B Fiches technique(PDF) 6 Page - STMicroelectronics

No de pièce TDA7439B
Description  THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
Download  19 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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The fig.5 refers to basic T Type Bandpass Filter starting from the filter component values (R1 internal and
R2,C1,C2 external) the centre frequency Fc, the gain Av at max. boost and the filter Q factor are computed
as follows:
Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be:
3.2 Treble Stage
The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25K
Ω typical) and
an external capacitor connected between treble pins and ground Typical responses are reported in Figg.
10 to 13.
3.3 CREF
The suggested 10
µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires
faster power ON.
F
C
1
2
π
R1 R2 C 1 C2
⋅⋅
⋅⋅
-----------------------------------------------------------------
=
A
V
R2C 2
R2C1
RiC1
++
R2 C1
R2C2
+
------------------------------------------------------------
=
Q
R 1 R2 C1 C2
⋅⋅
R 2C1
R2C2
+
--------------------------------------------------
=
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 6. THD vs. frequency
Figure 7. THD vs. RLOAD


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