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參數(shù)資料
| 型號(hào)： | TDA7449D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 198K |
| 代理商： | TDA7449D |
TDA7449
6/19
3
APLICATION 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.
3.1 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.6 refers to basic T Type Bandpass Filter
starting from the filter component values (R1 internal Fc, the gain Av at max. boost and the filter Q factor
are computed as follows:
Figure 6.
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
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
F reference capacitor (CREF) value can be reduced to 4.7F if the application requires
faster power ON.
Ri internal
C2
OUT
IN
C1
R2
D95AU313
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
----------------------------------------------------------------------
=
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|---|---|
| TDA7449D13TR | 功能描述:音頻 DSP Audio Tone CTRL 2 Stereo Inputs 1 dB RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
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