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參數(shù)資料
| 型號： | SAA7706H/N210S,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 13/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP CAR RADIO 80QFP |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 類型： | 汽車信號處理器 |
| 接口： | I²C，I²:S，LSB，SPDIF |
| 電壓 - 輸入/輸出： | 3.30V |
| 電壓 - 核心： | 3.30V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-BQFP |
| 供應(yīng)商設(shè)備封裝： | 80-QFP（14x20） |
| 包裝： | 帶卷 (TR) |
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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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