參數(shù)資料
型號(hào)： TDA7719
廠商： STMICROELECTRONICS
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28
封裝： ROHS COMPLIANT, MO-153AC, TSSOP-28
文件頁數(shù)： 18/46頁
文件大小： 590K
代理商： TDA7719
TDA7719
Description
Doc ID 13698 Rev 4
4.11
DC offset detector and level meter option
This device provide DC offset detector function and level meter function option. In one
specific application, only one of the function can be used. The configuration of the function
is controlled by I2C bus (Byte3 Bit7).
When the device uses DC offset detector function, Pin22, Pin27 and Pin28 are used as
WinTC, DCErr and WinIN for DC offset detector. When it is configured as level meter, DCErr
becomes level meter output. In the mean time, WinIN is used as beep input (Mono single-
ended input for mixing), and WinTC becomes a reference voltage output (4 V external DC
voltage or 3.3 V internal reference voltage).
4.12
DC offset detector
Using the DC offset detection circuit (Figure 19) an offset voltage difference between the
audio power amplifier and the TDA7719's Front and Rear outputs can be detected,
preventing serious damage to the loudspeakers. The circuit compares whether the signal
crosses the zero level inside the audio power at the same time as in the speaker cell. The
output of the zero-window-comparator of the power amplifier must be connected with the
WinIn-input of the TDA7719. The WinIn-input has an internal pull-up resistor connected to
5.5Volts. It is recommended to drive this pin with open-collector outputs only.
To compensate for errors at low frequencies the WinTC-pin are implemented, with external
capacitors introducing the same delay
τ = 7.5kΩ * C
ext as the AC-coupling between the
TDA7719 and the power amplifier introduces. For the zero window comparators, the time
constant for spike rejection as well as the threshold are programmable.
For electrical characteristics see Chapter 3 on page 9.
A low-active DC-offset error signal appears at the DCErr output if the next conditions are
both true:
a)
Front and rear outputs are inside zero crossing windows.
b)
The Input voltage VWinIn is logic low whenever at least one output of the power
amplifier is outside the zero crossing windows.
After power-on, the external attached capacitor is rapidly charged (fast-charge) to overcome
a false indication.
相關(guān)PDF資料
PDF描述
TDA7719TR 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28
TDA7850AH 30 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM27
TDA7850A 30 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM27
TDA7850H 80 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25
TDA7850 80 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7719TR 功能描述:音頻放大器 3 Band Car Audio Processor 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
TDA7730B 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SINGLE CHIP RDS DEMODULATOR + FILTER
TDA7801 功能描述:音頻放大器 Digital Input Quad Bridge Pwr Amplifier 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
TDA7801H 功能描述:音頻放大器 Digital Input Quad Bridge Pwr Amplifier 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
TDA7801PD 功能描述:音頻放大器 Digital Input Quad Bridge Pwr Amplifier 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
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