參數(shù)資料
型號(hào)： TDA7491MV
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
封裝： ROHS COMPLIANT, SSOP-36
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 696K
代理商： TDA7491MV
Application information
TDA7491MV
22/28
Doc ID 14576 Rev 2
7.4
Internal and external clocks
The clock of the class-D amplifier can be generated internally or can be driven by an
external source.
If two or more class-D amplifiers are used in the same system, it is recommended that all
devices operate at the same clock frequency. This can be implemented by using one
TDA7491MV as master clock, while the other devices are in slave mode (that is, externally
clocked. The clock interconnect is via pin SYNCLK of each device. As explained below,
SYNCLK is an output in master mode and an input in slave mode.
7.4.1
Master mode (internal clock)
Using the internal oscillator, the output switching frequency, fSW, is controlled by the
resistor, ROSC, connected to pin ROSC:
fSW = 10
6 / ((16 * R
OSC + 182) * 4) kHz
where ROSC is in k.
In master mode, pin SYNCLK is used as a clock output pin, whose frequency is:
fSYNCLK = 2 * fSW
For master mode to operate correctly then resistor ROSC must be less than 60 k as given
below in Table 9.
7.4.2
Slave mode (external clock)
In order to accept an external clock input the pin ROSC must be left open, that is, floating.
This forces pin SYNCLK to be internally configured as an input as given in Table 9.
The output switching frequency of the slave devices is:
fSW = fSYNCLK / 2
Figure 22.
Master and slave connection
Table 9.
How to set up SYNCLK
Mode
ROSC
SYNCLK
Master
ROSC < 60 k
Output
Slave
Floating (not connected)
Input
SYNCLK
ROSC
Rosc
Cosc
ROSC
SYNCLK
39 k
100 nF
Output
Input
Master
Slave
TDA7491MV
相關(guān)PDF資料
PDF描述
TDA7491P13TR 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7491P 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA749213TR 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7492 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36
TDA7492MV13TR 50 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO36
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7491MV13TR 功能描述:音頻放大器 25W Mono BTL Class-D 4-Select dB 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
TDA7491P 功能描述:音頻放大器 20W Dual BTL Class D 18V VCC Audio 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
TDA7491P13TR 功能描述:音頻放大器 20W Dual BTL Class D 18V VCC Audio 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
TDA7492 功能描述:音頻放大器 50W + 50W Dual BTL Class-D 4-Select dB 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
TDA749213TR 功能描述:音頻放大器 50W + 50W Dual BTL Class-D 4-Select dB 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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