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参数资料
| 型号： | TDA7407 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, LQFP-44 |
| 文件页数： | 26/46页 |
| 文件大小： | 692K |
| 代理商： | TDA7407 |
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Product(s)
Multipath detector
TDA7407
Figure 24.
Block diagram of the multipath detector
5.4.1
Programming
To obtain a good multipath performance an adaptation is necessary. Therefore the gain of
the 19kHz bandpass is programmable in four steps as well as the rectifier gain. The attack
and decay times can be set by the external capacitor value.
5.4.2
Quality detector
The TDA7407 offers a quality detector output which gives a voltage representing the FM
reception conditions. To calculate this voltage the MPX noise and the multipath detector
output are summed according to the following formula:
Quality = 1.6 (Vnoise -0.8V)+ a (REF5V - VMPOUT)
The noise signal is the PEAK signal without additional influences. The factor "a" can be
programmed from 0.7 to 1.15. the output is a low impedance output able to drive external
circuitry as well as simply fed to an A/D converter for RDS applications.
5.4.3
AF Search Control
The TDA7407 is supplied with several functionality to support AF checks using the stereo
decoder. As mentioned already before the high ohmic mute feature avoids any clicks during
the jump condition. It is possible at the same time, to evaluate the noise and multipath
content of the alternate frequency, by using the quality detector output. Therefore the
multipath detector is switched automatically to a small time constant. No additional pin
(AFS) is implemented in order to separate the audioprocessor mute and stereo decoder AF
functions. In Figure 25 the block diagram and control functions of the complete AFS
functionality is shown (please note that the pins AFS and SM are active low as well as all
control bits indicated by an overbar).
5.5
Test mode
During the test mode, which can be activated by setting bit D0 of the testing byte and bit D5
of the subaddress byte to "1", several internal signals are available at the CASSR pin.
During this mode the input resistor of 100kOhm is disconnected from the pin. The internal
signals available are shown in the software specification.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7407_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced car signal processor |
| TDA7407D | 功能描述:音频 DSP INFOTAINMENT SIGNAL RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TDA7407DTR | 功能描述:IC PROCESSOR ADV SIGNAL 44-LQFP RoHS:是 类别:集成电路 (IC) >> 线性 - 音频处理 系列:- 其它有关文件:STA321 View All Specifications 标准包装:1 系列:Sound Terminal™ 类型:音频处理器 应用:数字音频 安装类型:表面贴装 封装/外壳:64-LQFP 裸露焊盘 供应商设备封装:64-LQFP EP（10x10） 包装:Digi-Reel® 其它名称:497-11050-6 |
| TDA7407TR | 功能描述:处理器 - 专门应用 Advanced car signal processor RoHS:否 制造商:Freescale Semiconductor 类型:Multimedia Applications 核心:ARM Cortex A9 处理器系列:i.MX6 数据总线宽度:32 bit 最大时钟频率:1 GHz 指令/数据缓存: 数据 RAM 大小:128 KB 数据 ROM 大小: 工作电源电压: 最大工作温度:+ 95 C 安装风格:SMD/SMT 封装 / 箱体:MAPBGA-432 |
| TDA7409 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:CARRADIO-SIGNAL-PROCESSOR |
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