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參數資料
型號： TLV320AIC3120IRHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數： 97/150頁
文件大小： 1507K
代理商： TLV320AIC3120IRHBR
AVDD
VOL/MICDET
R1
34.8 kW
P1
25 kW
R2
9.76 kW
AVSS
1
F
m
SLAS653 – FEBRUARY 2010
www.ti.com
Figure 5-30. Example Analog Volume Control Circuit to VOL/MICDET Pin
Table 5-27. VOL/MICDET Pin Gain Scaling
ADC VOLTAGE
R1
P1
R2
DIGITAL GAIN RANGE
for AVDD = 3.3 V
(k
)
(k
)
(k
)
(dB)
(V)
25
0
0 V to 1.65 V
18 dB to –63 dB
33
25
7.68
0.386 V to 1.642 V
3 dB to –63 dB
34.8
25
9.76
0.463 V to 1.649 V
0 dB to –63 dB
5.6.4
Dynamic Range Compression
Typical music signals are characterized by crest factors, the ratio of peak signal power to average signal
power, of 12 dB or more. To avoid audible distortions due to clipping of peak signals, the gain of the DAC
channel must be adjusted so as not to cause hard clipping of peak signals. As a result, during nominal
periods, the applied gain is low, causing the perception that the signal is not loud enough. To overcome
this problem, DRC in the TLV320AIC3120 continuously monitors the output of the DAC digital volume
control to detect its power level relative to 0 dBFS. When the power level is low, DRC increases the input
signal gain to make it sound louder. At the same time, if a peaking signal is detected, it autonomously
reduces the applied gain to avoid hard clipping. This results in sounds more pleasing to the ear as well as
sounding louder during nominal periods.
The DRC functionality in the TLV320AIC3120 is implemented by a combination of processing blocks in the
DAC channel as described in Section 5.6.1.2.
DRC can be disabled by writing to page 0 / register 68, bits D6–D5.
DRC typically works on the filtered version of the input signal. The input signals have no audio information
at dc and extremely low frequencies; however, they can significantly influence the energy estimation
function in DRC. Also, most of the information about signal energy is concentrated in the low-frequency
region of the input signal.
To estimate the energy of the input signal, the signal is first fed to the DRC high-pass filter and then to the
DRC low-pass filter. These filters are implemented as first-order IIR filters given by
50
APPLICATION INFORMATION
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TLV320AIC3120
相關PDF資料
PDF描述
TLV320AIC3120IRHBT AUDIO AMPLIFIER, PQCC32
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TLV320AIC31IRHBTG4 SPECIALTY CONSUMER CIRCUIT, PQCC32
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相關代理商/技術參數
參數描述
TLV320AIC3120IRHBT 功能描述:接口—CODEC Low-Pwr Audio CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC31EVM 功能描述:音頻 IC 開發工具 TLV320AIC31 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
TLV320AIC31EVM-PDK 功能描述:音頻 IC 開發工具 TLV320AIC31-PDK 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
TLV320AIC31IRHBR 功能描述:接口—CODEC Lo-Pwr Ster Codec for Port Aud/Teleph RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC31IRHBRG4 功能描述:接口—CODEC Lo-Pwr Ster Codec for Port Aud/Teleph RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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