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TDA7439 データシート(PDF) 8 Page - STMicroelectronics

部品番号 TDA7439
部品情報  Three-band digitally-controlled audio processor
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7439 データシート(HTML) 8 Page - STMicroelectronics

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The first and the last stages are volume control blocks. The control range is 0 to -47 dB and
mute for the first stage and 0 to -79 dB and mute for the last one. Both control blocks have a
step resolution of 1 dB.
This very high resolution allows the implementation of systems free from any noisy
acoustical effect.
The TDA7439 audio processor provides 3 bands of tone control (bass, mid-range and
treble).
3.1
Tone control
3.1.1
Bass, mid-range stages
The bass and the mid-range cells have the same structure.
However, the bass cell has an internal resistor RB of typically 44 kΩ whilst the mid-range cell
has an internal resistor RM of typically 25 kΩ.
Several filter types can be implemented by connecting external components to the bass/mid
IN and OUT pins.
Typical responses are shown in Figure 8, Figure 9 and Figure 11.
Figure 4.
Bass/mid-range filter implementation
Figure 4. refers to the basic T-type band-pass filter. Starting from the filter component values
(R1 (internal) and R2, C1, C2 (external)) then the centre frequency fC, the gain Av at
maximum boost and the filter Q factor are computed as follows:
Ri internal
C2
OUT
IN
C1
R2
D95AU313
f
C
1
2
π
R1 R2 C1 C2
⋅⋅
⋅⋅
-----------------------------------------------------------------
=
A
V
R2C2
R2C1
RiC1
++
R2C1
R2C2
+
------------------------------------------------------------
=
Q
R1 R2 C1 C2
⋅⋅
R2C1
R2C2
+
-------------------------------------------------
=


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