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TDA7438D013TR Ver la hoja de datos (PDF) - STMicroelectronics

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TDA7438D013TR
ST-Microelectronics
STMicroelectronics ST-Microelectronics
TDA7438D013TR Datasheet PDF : 19 Pages
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TDA7438
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:
Fc
=
----------------------------1------------------------------
2 ⋅ π ⋅ Ri, R2, C1, C2
AV = -R----2----C--R---2--1---+-C----R1----2-+---C--R---1--2---+-C----R-2----i-C-----1--
Q = --R---R--2--i--,C---R--1---2--+-,---CR-----12---,-C--C---2--2--
Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be:
C1 = 2-------A-π----V----R–-----1i-----Q---
C2 = A---Q--V---2-–-----1-C---Q--1---2-
R2 = 2--------π--------C----A-1---V-----F–----c-1----–-(---A-Q---V--2---–----1----)-------Q---
3.2 Treble Stage
The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25Ktypical) and
an external capacitor connected between treble pins and ground Typical responses are reported in Figg.
14 to 17.
3.3 CREF
The suggested 10mF reference capacitor (CREF) value can be reduced to 4.7mF if the application re-
quires faster power ON.
Figure 6. THD vs. frequency
Figure 7. THD vs. RLOAD
6/19

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