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參數(shù)資料
| 型號(hào)： | TDA7439 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDIP30 |
| 封裝： | 0.400 INCH, SDIP-30 |
| 文件頁數(shù)： | 22/23頁 |
| 文件大小： | 296K |
| 代理商： | TDA7439 |
Application suggestions
TDA7439
8/23
3
Application suggestions
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 k whilst the mid-range cell
has an internal resistor RM of typically 25 k.
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7439_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Three-band digitally-controlled audio processor |
| TDA7439B | 功能描述:音頻 DSP 3-Band Digital Cont 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 |
| TDA7439D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR |
| TDA7439DS | 功能描述:音頻 DSP 3-Band Digital Cont 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 |
| TDA7439DS_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Three-band digitally-controlled audio processor |
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