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参数资料
| 型号： | TDA7492P13TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 13/26页 |
| 文件大小： | 508K |
| 代理商： | TDA7492P13TR |
Applications information
TDA7492P
Doc ID 15068 Rev 3
6.4
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
TDA7492P 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.
6.4.1
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 8.
6.4.2
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 8.
The output switching frequency of the slave devices is:
fSW = fSYNCLK / 2
s
Figure 24.
Master and slave connection
Table 8.
How to set up SYNCLK
Mode
ROSC
SYNCLK
Master
ROSC < 60 k
Output
Slave
Floating (not connected)
Input
SYNCLK
ROSC
TDA7492P
Rosc
Cosc
ROSC
SYNCLK
TDA7492P
39 k
100 nF
Output
Input
Master
Slave
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| TDA7493 | 功能描述:音频放大器 3W + 3W Dual BTL Class-D 4-Select dB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA749313TR | 功能描述:音频放大器 3W and 3Watt Dual BTL Class D Audio RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7494 | 功能描述:音频放大器 10W DC Amp w/Vol Cnt RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7494S | 功能描述:音频放大器 Video switch chip RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7494SA | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5W+5W AMPLIFIER WITH DC VOLUME CONTROL |
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