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| 型号： | SAA7706H/N107,557 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 9/52页 |
| 文件大小： | 0K |
| 描述： | IC CAR RADIO DSP 80-QFP |
| 标准包装： | 330 |
| 类型： | 汽车信号处理器 |
| 接口： | I²C，I²:S，LSB，SPDIF |
| 电压 - 输入/输出： | 3.30V |
| 电压 - 核心： | 3.30V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-BQFP |
| 供应商设备封装： | 80-QFP（14x20） |
| 包装： | 托盘 |
| 其它名称： | 935267098557 SAA7706H/N107 SAA7706H/N107-ND |
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2001 Mar 05
17
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.3
Signal path for level information
For FM weak signal processing, for AM and FM purposes
(absolute level and multipath) a level input is implemented
(pin LEVEL). In the event of radio reception the clocking of
the filters and the level-ADC is based on a 38 kHz
sampling frequency. A DC input signal is converted by a
bitstream sigma-delta ADC followed by a decimation filter.
The input signal has to be obtained from a radio part. The
tuner must deliver the level information of either AM or FM
to pin LEVEL.
The input signal for level must be in the range 0 to 3.3 V
(VVDACP VVDACN). The 9-bit level-ADC converts this
input voltage in steps with a resolution better than at least
14 mV over the 3.3 V range.
The tolerance on the gain is less than 2%. The MSB is
always logic 0 to represent a positive level. Input level
span can be increased by an external resistor tap. The
high input impedance of the level-ADC makes this
possible.
The decimation filter reduces in the event of an 38 kHz
based clocking regime the bandwidth of the incoming
signal to a frequency range of 0 to 29 kHz with a resulting
fs = 76 kHz. The response curve is given in Fig.9.
The level information is sub-sampled by the DSP1 to
obtain a field strength and a multipath indication. These
values are stored in the coefficient or data RAM. Via the
I2C-bus they can be read and used in other microcontroller
programs.
handbook, full pagewidth
10
010
40
30
80
70
60
50
20
40
50
60
10
0
30
20
f (kHz)
α
(dB)
MGT465
Fig.9 Frequency response level-ADC and decimal filter.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAA7707H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Car radio Digital Signal Processor CDSP |
| SAA7708H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Car Radio Digital Signal Processor |
| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音频 DSP DIGITAL SIGNAL PROCESSOR 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 |
| SAA7709H/N103,518 | 功能描述:音频 DSP DIRAC-2 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 |
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