參數(shù)資料
型號(hào)： TDA7402
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁數(shù)： 18/69頁
文件大?。?/td> 865K
代理商： TDA7402
TDA7402
Audioprocessor part
3.11
Compander
Signal compression
A fully integrated signal compressor with programmable attack and decay times is present in
the TDA7402 (see Figure 17).
The compander consists of a signal level detection, an A/D Converter plus adder and the
normal Soft Step volume stage. First of all the left and the right InGain-signal is rectified,
respectively, and the logarithm is build from the summed signal. The following low-pass
smooth the output-signal of the logarithm amplifier and improves the low frequency
suppression. The low pass output-voltage then is A/D converted an added to the current
volume-word defined by the I2C bus. Assuming reference level or higher at the compander
input, the output of the ADC is 0. At lower levels the voltage is increasing with 1Bit/dB. It is
obvious that with this configuration and a 0.5dB-step volume stage the compression rate is
fixed to 2:1 (1dB less at the input leads to 0.5dB less at the output).
The internal reference level of the compander is programmable in three steps from 0.5VRMS
to 2VRMS. For a proper behavior of the compression circuit it is mandatory to have at a 0dB
input signal exactly the programmed reference level after the InGain-stage. E.g. at a
configured reference-level of 0.5VRMS the output of the InGain stage has to have also
0.5VRMS at 0dB source-signal (Usually the 0dB for CD is defined as the maximum possible
signal-level). To adapt the external level to the internal reference level the programmable
attenuation in the differential stages and the InGain can be used.
Figure 17.
Compander block diagram
3.11.1
Anti-clipping
In a second application the compander-circuit can be used for a anti-clipping or limiting
function. In this case one of the dedicated inputs (AM or MPin) is connected directly to the
clip-detector of the power-amplifier. if no clipping is detected, the open-collector output of
the power-amplifier is highohmic and the input-voltage of the rectifier is VREF. The level
detector interprets this as a very small signal and reacts with the maximum programmed
compander gain. In the application this gain has to be compensated by decreasing the
INL
INR
INL
INR
CLKATT
CLKREL
OUTL
OUTR
OUTL
8 Bit
SOFT STEP VOLUME
ADDER
IIC-BUS
VOLUME
CONTROL
D
-
+
A
+
OUTR
8 Bit
6 Bit
LOG
AMPL
INPUT
SELECT
ANTI-CLIP
ENABLE
CLPIN
RIN
LIN
AM
MPIN
50Hz LOW-PASS
STEREO FULL
WAVE RECTIFIER
D00AU1147
相關(guān)PDF資料
PDF描述
TDA7403D SPECIALTY CONSUMER CIRCUIT, PDSO20
TDA7403DTR SPECIALTY CONSUMER CIRCUIT, PDSO20
TDA7404DTR 1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28
TDA7404D 1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28
TDA7405TR SPECIALTY CONSUMER CIRCUIT, PQFP44
相關(guān)代理商/技術(shù)參數(shù)
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TDA7403 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR
TDA7403_02 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR
TDA7403D 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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