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TDA7449 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. TDA7449
Description  TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TDA7449 Datasheet(HTML) 6 Page - STMicroelectronics

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APPLICATION SUGGESTIONS
The first and the last stages are volume control
blocks. The control range is 0 to -47dB (mute) for
the first one, 0 to -79dB (mute) for the last one.
Both of them have 1dB step resolution.
The very high resolution allows the implementation
of systems free from any noisy acoustical effect.
The TDA7449 audioprocessor provides 2 bands
tones control.
Bass, Stages
The Bass cell has an internal resistor Ri = 25K
typical.
Several filter types can be implemented, connect-
ing external components to the Bass IN and OUT
pins.
The fig.1 refers to basic T Type Bandpass Filter
starting from the filter component values (R1 in-
ternal and R2,C1,C2 external) the centre fre-
quency Fc, the gain Av at max. boost and the fil-
ter Q factor are computed as follows:
FC
=
1
2
π ⋅√
Ri, R2, C1, C2
AV
= R2 C2 + R2 C1+ Ri C1
R2 C1
+ R2 C2
Q
= √
Ri R2
+ C1 C2
R2 C1
+ R2 C2
Viceversa, once Fc, Av, and Ri internal value are
fixed, the external components values will be:
C1
=
AV
− 1
2
π ⋅ Ri ⋅ Q
C2
=
Q
2 ⋅ C1
(AV − 1) Q2
R2
=
AV
− 1 − Q2
2
⋅ π ⋅ C1
FC ⋅ (AV − 1) ⋅Q
Treble Stage
The treble stage is a high pass filter whose time
constant is fixed by an internal resistor (25K
typical) and an external capacitor connected be-
tween treble pins and ground
Typical responses are reported in Figg. 10 to 13.
CREF
The suggested 10
µF reference capacitor (CREF)
value can be reduced to 4.7
µF if the application
requires faster power ON.
Ri internal
C2
OUT
IN
C1
R2
D95AU313
Figure 1.
Figure 2: THD vs. frequency
Figure 3: THD vs. RLOAD
TDA7449
6/17


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