參數(shù)資料
型號(hào)： SAA7705H
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 消費(fèi)家電
英文描述： Car radio Digital Signal Processor（DSP）(車(chē)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)： 13/60頁(yè)
文件大?。?/td> 1857K
代理商： SAA7705H
1999 Aug 16
13
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
Parameter setting for the IAC detectors is done by means
of 5 different coefficients. Upon reset, the nominal setting
for a good performing IAC detector is selected.
8.1.5.1
AGC set point (1 bit)
In case the sensitivity and feed-forward factor are out of
range in a certain application, the set point of the AGC
can be shifted. The set point controls the sensitivity of
the other IAC control parameters. See bit 11 of the IAC
register (Table 11).
8.1.5.2
Threshold sensitivity offset (3 bits)
With this parameter the threshold sensitivity of the
comparator in the interfering pulse detectors can be set.
It also influences the amount of unwanted triggering.
Settings are according to Table 25.
8.1.5.3
Deviation feed-forward factor (3 bits)
This parameter determines the reduction of the sensitivity
of the detector by the absolute value of the MPX signal.
This mechanism prevents the detector from unwanted
triggering at noise with modulation peaks. In Table 24 the
possible values are given.
8.1.5.4
Suppression stretch time (3 bits)
This parameter sets the duration of the pulse suppression
after the detector has stopped sending a trigger pulse.
It can be switched off by setting the value ‘000’.
The duration can be selected in steps of one period of the
304 kHz (3.3
μ
s) sample frequency. In Table 23 the
possible values are given.
8.1.5.5
MPX delay (2 bits)
With this parameter the delay time between
2 and 5 samples of the 304 kHz sample frequency can be
selected. The needed value depends on the used front
end of the car radio. Settings are according to Table 22.
8.1.5.6
Level-IAC threshold (4 bits)
With this parameter the sensitivity of the comparator in the
ignition interference pulse detector can be set. It also
influences the amount of unwanted triggering.
The possible values are given in Table 21. The prefix
value ‘0000’ switches off the level-IAC function.
8.1.5.7
Level-IAC feed-forward setting (2 bits)
This parameter allows for adjusting delay differences in
the signal paths from the FM antenna to the MPX mute,
namely, via the FM level-ADC and level-IAC detection and
via the FM demodulator and MPX conversion and filtering.
These differences depend on the front end used in the car
radio. With a simultaneous appearance of a peak
disturbance at the FM level input and the MPX ADC input
of the IC, a zero delay setting takes care for the level-IAC
mute pulse to coincide with the passage of the disturbance
in the MPX mute circuit. The setting for the level-IAC
feed-forward allows to advance the mute pulse by
1 sample period or to delay it by 1 or 2 sample periods of
the 304 kHz clock, with respect to the default value.
The appropriate register bits for each setting are given in
Table 20.
8.1.5.8
Level-IAC suppression stretch time (2 bits)
This parameter sets the time that the mute pulse is
stretched when the FM level input has stopped exceeding
the threshold. The duration can be selected in steps of one
period of the 304 kHz (3.3
μ
s) sample frequency.
In Table 19 the possible values are given.
8.1.5.9
Dynamic IAC threshold levels
If enabled by bit 15 of the LEVELIAC register, this block
will disable temporarily all IAC actions if the MPX mono
signal exceeds a threshold deviation (threshold 1) for a
given time with a given excess amount (threshold 2). This
MPX mono signal is separated from the MPX signal with a
low-pass filter with the
3 dB corner point at 15 kHz.
The possible values of this threshold are given in
Table 18.
8.1.5.10
IAC testing mode
The internal IAC trigger signal is visible on pin DSPOUT2
if bit IACTRIGGER of the IAC register is set. In this mode
the effect of the parameter settings on the IAC
performance can be verified.
8.2
Analog source selection and analog-to-digital
conversion
8.2.1
I
NPUT SELECTION SWITCHES
In Fig.3 the block diagram of the input is shown. The input
selection is controlled by bits in the input selector control
register and the input selection pin SELFR.
The relationship between these bits and the switches is
indicated in Table 26.
8.2.2
S
IGNAL FLOW OF THE
AM,
ANALOG
CD
AND
TAPE
INPUTS
The signal of the two single-ended stereo AM inputs can
be selected by the correct values of the SEL register bits
according to Table 26.
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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(chēng):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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