參數(shù)資料
型號(hào)： SAA7705H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Car radio Digital Signal Processor（DSP）(車載電臺(tái)數(shù)字信號(hào)處理器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
文件頁(yè)數(shù)： 12/60頁(yè)
文件大?。?/td> 1857K
代理商： SAA7705H
1999 Aug 16
12
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
series capacitor (because the FMMPX input of the
SAA7705H is low-ohmic). Pulling SELFR HIGH during
such an update, causes the FMMPX input to become
high-ohmic, preventing charging of the capacitor.
The signal probing of the new transmitter quality is done
via the FMRDS input.
8.1.5
I
NTERFERENCE ABSORPTION CIRCUIT
The Interference Absorption Circuit (IAC) detects and
suppresses ignition interference. This hardware IAC is a
modified, digitized and extended version of the analog
circuit which is in use for many years already.
The IAC consists of an MPX mute function switched by
mute pulses from two ignition interference pulse detectors.
A third detector inhibits muting.
The three detectors are:
Interference detector:
The input signal of the first
detectoristheoutputsignalofSCAD1.Thisinterference
detector analyses the high frequency contents of the
MPX signal. The discrimination between interference
pulses and other signals is performed by a special
Philips patented fuzzy logic such as algorithm and is
based on probability calculations. This detector
performs optimally with higher antenna voltages.
On detection of ignition interference, this logic will send
appropriate pulses to the MPX mute switch.
Level detector:
The input signal of the second detector
is the FM level signal (the output of the level-ADC).
This detector performs optimally with lower antenna
voltages. It is therefore complementary to the first
detector.Thecharacteristicsofbothignitioninterference
pulse detectors can be adapted to the properties of
different FM front ends by means of the coefficients in
the IAC register and the level-IAC register
(see Section 12.4). Both IAC detectors can be switched
on or off independently. Both IAC detectors can mute
the MPX signal independently.
Dynamic detector:
The third detector is the dynamic
IAC circuit. This detector switches off the IAC
completely if the frequency deviation of the FM multiplex
signal is too high. The use of narrow band IF filters can
result in AM modulation. This AM modulation could be
interpreted by the IAC circuitry as interference caused
by the car’s engine.
Fig.3 Analog input switching circuit.
handbook, full pagewidth
MGM123
SCAD2
LEVEL-ADC
SCAD1
INPUT
SELECTOR
ROUTER
SCAD3
GAIN
CONTROL
FML
3
AML
4
AMAFR
66
TAPER
68
AMAFL
TAPEL
67
69
CDLB
73
CDLI
72
CDRB
71
CDGND
77
CDRI
70
FMMPX
80
FMRDS
79
SELFR
61
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7706H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car radio Digital Signal Processor (DSP)
SAA7706H/N107 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIRAC-1 RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,557 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107S,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC CAR RADIO DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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