參數(shù)資料
型號： TLV320AIC34_1
廠商： Texas Instruments, Inc.
元件分類： Codec
英文描述： FOUR-CHANNEL, LOW-POWER AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY
中文描述： 四通道，低功耗音頻編解碼器的便攜式音頻/電話
文件頁數(shù)： 35/94頁
文件大?。?/td> 905K
代理商： TLV320AIC34_1
www.ti.com
Digital Audio Data Serial Interface
ADC
+
+
D
D
B
W
D
D
D
D
ADC
AGC
AGC
Record Path
Record Path
Effects
Effects
SW-D1
SW-D2
SW-D4
SW-D3
Left-Channel
Analog Inputs
Right-Channel
Analog Inputs
PGA
0 dB–59.5 dB,
0.5-dB Steps
PGA
0 dB–59.5 dB,
0.5-dB Steps
Volume
Control
Volume
Control
DAC
Powered
Down
DAC
Powered
Down
DAC
L
DAC
R
B0173-02
AUTOMATIC GAIN CONTROL (AGC)
An automatic gain control (AGC) circuit is included with the ADC and can be used to maintain nominally constant
output signal amplitude when recording speech signals (it can be fully disabled if not desired). This circuitry
automatically adjusts the PGA gain as the input signal becomes overly loud or very weak, such as when a
person speaking into a microphone moves closer or farther from the microphone. The AGC algorithm has several
programmable settings, including target gain, attack and decay time constants, noise threshold, and maximum
PGA gain applicable that allow the algorithm to be fine-tuned for any particular application. The algorithm uses
the absolute average of the signal (which is the average of the absolute value of the signal) as a measure of the
nominal amplitude of the output signal.
TLV320AIC34
SLAS538A–OCTOBER 2007–REVISED NOVEMBER 2007
Figure 26. Record-Only Mode With Digital Processing Path Enabled
Note that completely independent AGC circuitry is included with each ADC channel with entirely independent
control over the algorithm from one channel to the next. This is attractive in cases where two microphones are
used in a system, but may have different placement in the end equipment and require different dynamic
performance for optimal system operation.
Target level
represents the nominal output level at which the AGC attempts to hold the ADC output signal level.
The TLV320AIC34 allows programming of eight different target levels, which can be programmed from –5.5 dB
to –24 dB relative to a full-scale signal. Because the device reacts to the signal absolute average and not to peak
levels, it is recommended that the target level be set with enough margin to avoid clipping at the occurrence of
loud sounds.
Copyright 2007, Texas Instruments Incorporated
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TLV320AIC34
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLV320AIC34EVM-K 功能描述:音頻 IC 開發(fā)工具 TLV320AIC34EVM-K Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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
TLV320AIC34IZAS 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC34IZASR 功能描述:接口—CODEC Low-Pwr 4-channel CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC36 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Power Stereo Audio Codec With Embedded miniDSP
TLV320AIC36EVM-K 功能描述:音頻 IC 開發(fā)工具 TLV320AIC36 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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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