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參數資料
| 型號： | TPA2017D2RTJR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數： | 2/20頁 |
| 文件大小： | 642K |
| 代理商： | TPA2017D2RTJR |
APPLICATION INFORMATION
AUTOMATIC GAIN CONTROL
ReleaseTime
E
Limiterthreshold
GAIN
A
C
B
D
AttackTime
Limiterthreshold
HoldTime
INPUTSIGNAL
OUTPUTSIGNAL
Limiterthreshold
SLOS584 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
The Automatic Gain Control (AGC) feature provides continuous automatic gain adjustment to the amplifier
through an internal PGA. This feature enhances the perceived audio loudness and at the same time prevents
speaker damage from occurring (Limiter function).
The AGC works by detecting the audio input envelope. The gain changes depending on the amplitude, the limiter
level, the compression ratio, and the attack and release time. The gain changes constantly as the audio signal
increases and/or decreases to create the compression effect. The gain step size for the AGC is 0.5 dB. If the
audio signal has near-constant amplitude, the gain does not change. Figure 19 shows how the AGC works.
A.
Gain decreases with no delay; attack time is reset. Release time and hold time are reset.
B.
Signal amplitude above limiter level, but gain cannot change because attack time is not over.
C.
Attack time ends; gain is allowed to decrease from this point forward by one step. Gain decreases because the
amplitude remains above limiter threshold. All times are reset
D.
Gain increases after release time finishes and signal amplitude remains below desired level. All times are reset after
the gain increase.
E.
Gain increases after release time is finished again because signal amplitude remains below desired level. All times
are reset after the gain increase.
Figure 19. Input and Output Audio Signal vs Time
10
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPA2017D2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA2017D2RTJT | 功能描述:音頻放大器 2.8W/Ch Stereo 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 |
| TPA2017D2RTJT | 制造商:Texas Instruments 功能描述:; No. of Channels:2; Output Power Po rm |
| TPA2017D2V2RTJR | 制造商:Texas Instruments 功能描述: |
| TPA2018D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-W Mono Class-D Audio Amplifier with SmartGain AGC/DRC |
| TPA2018D1YZFEVM | 功能描述:音頻 IC 開發工具 TPA2018D1YZF 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 |
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