TDA7439(2008) 데이터 시트보기 (PDF) - STMicroelectronics

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TDA7439
(Rev.:2008)

Three-band digitally-controlled audio processor

STMicroelectronics 

TDA7439

Application suggestions

Transposing and solving for the external component values we get:

C1 = -------------A-----V----–-----1--------------

2 ⋅ π ⋅ Fc ⋅ Ri ⋅ Q

C2 = ------Q----2-----⋅---C----1-------

AV – 1 – Q2

R2 = -2----⋅---π-----⋅---C-----A1----V-⋅---F–----c-1---⋅--–-(---AQ----V-2---–-----1----)---⋅---Q---

3.1.2

Treble stage

The treble stage is a high-pass filter whose time constant is fixed by an internal resistor

(25 kΩ 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

Figure 5. THD vs frequency

Figure 6. THD vs RLOAD

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