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參數(shù)資料
| 型號： | TAS5705PAPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP64 |
| 封裝： | 10 X 10 MM, GREEN, PLASTIC, HTQFP-64 |
| 文件頁數(shù)： | 30/72頁 |
| 文件大?。?/td> | 1168K |
| 代理商： | TAS5705PAPG4 |
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window
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t
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f ln 1
ae
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aa
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RMSVoltage
Estimator
RMSVoltage
Estimator
RMSVoltage
Estimator
RMSVoltage
Estimator
AudioInput
CH1
AudioInput
CH2
AudioInput
CH3
AudioInput
CH4
32
Comparator
Cut
Attack/DecayControl
DRC-Derived
GainCoefficient
Volume
K1
T1
{
O1
Compression/Offset
t
d
t
a
AudioIn
AudioOut
B0309-01
SLOS549A – JUNE 2008 – REVISED SEPTEMBER 2009 ................................................................................................................................................ www.ti.com
The threshold settings must be programmed as 32-bit (9.23 format) numbers.
Zero-valued and positive-valued threshold settings are not allowed, and cause unpredictable behavior if used.
Offsets O1 and O2 define, in dB, the attenuation (cut) or gain (boost) applied by the DRC-derived gain
coefficient at the threshold points T1 and T2, respectively. Positive offsets are defined as cuts, and thus boost
or gain selections are negative numbers.
Slopes k1 and k2 define the compression is to be performed within a given region, and the degree of
compression to be applied. Slopes are programmed as 26-bit (3.23 format) numbers.
DRC Implementation
Figure 4.13.1-1 shows the three elements comprising the DRC: (1) an RMS estimator, (2) a compression
coefficient computation engine, and (3) an attack/decay controller.
RMS Estimator—This DRC element derives an estimate of the rms value of the audio data stream into the
DRC. For the DRC block shared by Ch1 though Ch4 , the individual channel estimates are computed. The
outputs of the estimators are then compared, sample-by-sample, and the largest-valued sample is forwarded
to the compression/expansion coefficient-computation engine. Two programmable parameters, ae and (1 –
ae), set the effective time window over which the RMS estimate is made. For the DRC block shared by Ch1
though Ch4, the programmable parameters apply to both RMS estimators. The time window over which the
RMS estimation is computed can be determined by
Compression Coefficient Computation—This DRC element converts the output of the rms estimator to a
logarithmic number, determines the region where the input resides, and then computes and outputs the
appropriate coefficient to the attack/decay element. The programmable parameters, T1, T2, O1, O2, K1, and
K2, define the compression regions for both DRCs implemented by this element.
Attack/Decay Control—This DRC element controls the transition time of changes in the coefficient computed
in the compression/expansion coefficient computation element. Four programmable parameters define the
operation of this element. Parameters ad and (1 – ad) set the decay or release time constant to be used for
signal amplitude boost (expansion). Parameters aa and (1 – aa) set the attack time constant to be used for
signal amplitude cuts. The transition-time constants can be determined by
Figure 43. DRC Block Diagram
36
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TAS5705
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| TAS5705PAPR | 功能描述:音頻放大器 20W stereo Dig Audio Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5705PAPRG4 | 功能描述:音頻放大器 20W stereo Dig Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TAS5706 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
| TAS5706A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
| TAS5706A_0812 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W Stereo Digital Audio Power Amplifier with EQ and DRC |
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