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参数资料
| 型号： | SAA7706H/N107,557 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 13/52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
20
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.4.1
NOISE LEVEL
The high-pass 1 (HP1 or narrow band noise level filter)
output of the second MPX decimation filter in a band from
60 kHz to 120 kHz is detected with an envelope detector
and decimated to a frequency of 38 kHz. The response
time of the detector is 100
s. Another option is the
high-pass 2 (HP2 or wide band noise level filter). This
output of the first MPX decimation filter is in a band from
60 to 240 kHz. It has the same properties and is also
decimated to the same 38 kHz. Which of the signals is
used (HP1 or HP2) is determined by the I2C-bus
bit sel_nsdec.
The resulting noise information is rectified and has a word
length of 10 bits. This means that the lowest and/or the
highest possible level is not used. The noise level can be
detected and filtered in the DSP1-core and be used to
optimize the FM weak signal processing. The transfer
curves of both filters before decimation are shown in
Fig.12.
handbook, full pagewidth
140
0
100
50
MGT468
200
300
250
150
120
100
80
20
0
(1)
(2)
60
40
f (kHz)
α
(dB)
Fig.12 Frequency response of noise level before decimation.
(1) Noise with wide band digital filter.
(2) Noise with small band digital filter.
8.4.2
MONO OR STEREO SWITCHING
The DCS block uses a sample rate converter to derive
from the XTAL clock, via a PLL, a 512 multiple of 19 kHz
(9.728 MHz). In the event of mono reception the DCS
circuit generates a preset frequency of n
× 19 kHz ±2 Hz.
In the event of stereo reception the frequency is exactly
n
× 19 kHz (DCS locked to N × pilot tone). The detection of
the pilot and the stereo indication is done in the DSP
program.
8.4.3
THE AUTOMATIC LOCK SYSTEM
The VCO of the DCS block will be at 19 kHz
±2 Hz exact
based in the event of no-pilot FM_MPX reception or in the
event of only RDS reception. In the event of stereo
reception the phase error is zero for a pilot tone with a
frequency of exactly 19 kHz.
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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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