參數(shù)資料
型號: SAA7706H/N210S,518
廠商: NXP Semiconductors
文件頁數(shù): 11/52頁
文件大小: 0K
描述: IC DSP CAR RADIO 80QFP
標準包裝: 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
供應商設備封裝: 80-QFP(14x20)
包裝: 帶卷 (TR)
2001 Mar 05
19
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
The outputs of the stereo decoder to the DSP1, which are
all running on a sample frequency of 38 kHz are:
Pilot presence indication: pilot-I. This 1-bit signal is LOW
for a pilot frequency deviation <4 kHz and HIGH for a
pilot frequency deviation >4 kHz and locked on a pilot
tone.
‘Left’ and ‘right’ FM reception stereo signal: this is the
18-bit output of the stereo decoder after the matrix
decoding.
Noise level (see also Section 8.4.1): which is retrieved
from the high-pass output of the MPX filter. The noise
level is detected and filtered in the DSP1 and is used to
optimize the FM weak signal processing.
Normally the FM_MPX input and the FM_RDS input have
the same source. If the FM input contains a stereo radio
channel, the pilot information is switched to the Digitally
Controlled Sampling (DCS) clock generation and the DCS
clock is locked to the 256
× 38 kHz of the pilot. In this case
this locked frequency is also used for the RDS path
ensuring the best possible performance.
Except from the above mentioned theoretical response
also the non-flat frequency response of the ADC has to be
compensated in the DSP1 program.
handbook, full pagewidth
010
MGT467
30
70
60
50
40
20
100
80
20
0
60
40
f (kHz)
α
(dB)
Fig.11 Transfer of MPX signal at the output of the stereo decoder.
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