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參數資料
| 型號： | TPA2051D3YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.9 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA25 |
| 封裝： | 2.16 X 2.11 MM, 0.40 MM PITCH, GREEN, WCSP-25 |
| 文件頁數： | 15/34頁 |
| 文件大小： | 1594K |
| 代理商： | TPA2051D3YFFT |
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AUDIO TAPER GAIN VALUES
AUTOMATIC GAIN CONTROL
SLOS641A – JUNE 2009 – REVISED OCTOBER 2009 ..................................................................................................................................................... www.ti.com
For MONO, STEREO1, and STEREO2 inputs.
Table 3. Volume Control Gain Table
VOLUME CONTROL
NOMINAL GAIN
VOLUME CONTROL
NOMINAL GAIN
REGISTER BYTE: VOL[4:0]
00000
–66 dB
10000
+3 dB
00001
–54 dB
10001
+4 dB
00010
–42 dB
10010
+5 dB
00011
–36 dB
10011
+6 dB
00100
–30 dB
10100
+7 dB
00101
–24 dB
10101
+8 dB
00110
–18 dB
10110
+9 dB
00111
–12 dB
10111
+10 dB
01000
–9 dB
11000
+11 dB
01001
–6 dB
11001
+12 dB
01010
–4.5 dB
11010
+13 dB
01011
–3 dB
11011
+14 dB
01100
–1.5 dB
11100
+15 dB
01101
0 dB
11101
+16 dB
01110
+1 dB
11110
+17 dB
01111
+2 dB
11111
+18 dB
The automatic gain control (AGC) is a limiter function only (SpeakerGuardTM). It works by automatically adjusting
amplifier gain based on the audio signal level. This prevents speaker damage from audio that is too loud. The
AGC function can also be used to improve audio loudness without increasing the peak power delivered to the
speaker.
If the audio signal is higher than the limiter level, the gain will decrease until the audio signal is just below the
limiter setting. The gain decrease rate (attack time) is set via I2C interface.
If the audio signal is below the limiter level and the gain is below the fixed gain, the gain will increase. The gain
increase rate (release time) is set via I2C interface.
There are two register settings for the limiter level. The first one is for the speaker amplifier, and the second one
is for the headphone amplifier. If the speaker and headphone amplifiers are enabled at the same time, the limiter
level setting for the speaker amplifier takes precedence in setting the gain. If only the HP amplifier is enabled,
then the channel with the highest signal level dictates the AGC gain.
Table 4 shows the selectable limiter levels for the Class-D amplifier when SPK_Gain (Register 5, bit 7) is LOW
(6 dB).
22
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPA2051D3
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| TPA2054D4AYZKR | 功能描述:音頻放大器 1.4 W/Ch 3-Inp Audio Subsystem 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 |
| TPA2054D4AYZKT | 功能描述:音頻放大器 1.4 W/Ch 3-Inp Audio Subsystem 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 |
| TPA2054D4YZKEVM | 功能描述:音頻 IC 開發工具 TPA2054D4YZKEVM 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 |
| TPA2054D4YZKR | 功能描述:音頻放大器 1.4 W/Ch Stereo Class-D Aud Subsys 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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