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參數資料
| 型號： | TPA2026D2YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PBGA16 |
| 封裝： | 2.20 X 2.20 MM, GREEN, DSBGA-16 |
| 文件頁數： | 9/39頁 |
| 文件大?。?/td> | 823K |
| 代理商： | TPA2026D2YZHT |
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V
-dBV
O
U
T
V
-dBV
IN
Increasing
Limiter
Level
Decreasing
Limiter
Level
LimiterLevel= 500mW
LimiterLevel= 630mW
= 400
LimiterLevel
mW
V
-dBV
O
U
T
V
-dBV
IN
1
:1
LargeFixedGain
Small
Fixed
Gain
Input signal initial amplitude - |Current input signal amplitude|
Output signal amplitude =
Compression ratio
0dBV
|
32 dBV|
8dBV =
4
-
www.ti.com
SLOS649A – MARCH 2010 – REVISED JANUARY 2011
Figure 34. Output Signal vs Input Signal State Diagram Showing Different Limiter Level Configurations
The limiter level and the fixed gain influence each other. If the fixed gain is set high, the AGC has a large limiter
range. The fixed gain is set low, the AGC has a short limiter range. Figure 35 illustrates the two examples:
Figure 35. Output Signal vs Input Signal State Diagram Showing Same Limiter Level Configurations with
Different Fixed Gain Configurations
Compression Ratio: The compression ratio sets the relation between input and output signal outside the limiter
level region. The compression ratio compresses the dynamic range of the audio. For example if the audio source
has a dynamic range of 60dB and compression ratio of 2:1 is selected, then the output has a dynamic range of
30dB. Most small form factor speakers have small dynamic range. Compression ratio allows audio with large
dynamic range to fit into a speaker with small dynamic range.
The compression ratio also increases the loudness of the audio without increasing the peak voltage. The higher
the compression ratio, the louder the perceived audio.
For example:
A compression ratio of 4:1 is selected (meaning that a 4dB change in the input signal results in a 1dB signal
change at the output)
A fixed gain of 0dB is selected and the maximum audio level is at 0dBV.
When the input signal decreases to –32dBV, the amplifier increases the gain to 24dB in order to achieve an
output of –8dBV. The output signal amplitude equation is:
(1)
In this example:
(2)
Copyright 2010–2011, Texas Instruments Incorporated
17
Product Folder Link(s): TPA2026D2
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| TPA2028D1YZFEVM | 功能描述:音頻 IC 開發工具 TPA2028D1YZFEVM Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA2028D1YZFEVM | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| TPA2028D1YZFR | 功能描述:音頻放大器 3.0 W Mono Class-D Audio Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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