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参数资料
| 型号： | TPA2017D2RTJR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-20 |
| 文件页数： | 2/20页 |
| 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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相关代理商/技术参数 |
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| TPA2017D2RTJT | 功能描述:音频放大器 2.8W/Ch Stereo Class-D Audio Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装: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 制造商全称:Texas Instruments 功能描述:3-W Mono Class-D Audio Amplifier with SmartGain AGC/DRC |
| TPA2018D1YZFEVM | 功能描述:音频 IC 开发工具 TPA2018D1YZF Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
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