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參數(shù)資料
| 型號： | SAA7705H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Car radio Digital Signal Processor（DSP）(車載電臺數(shù)字信號處理器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 文件頁數(shù)： | 14/60頁 |
| 文件大?。?/td> | 1857K |
| 代理商： | SAA7705H |
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1999 Aug 16
14
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
The AM and the TAPE inputs are buffered with an
operational amplifier to ensure a high-impedance input
which enables the use of an external resistor divider for
signal reduction. For correct biasing of the first operational
amplifier a resistor must be connected between the input
and pin VREFAD, which acts as a virtual ground (see
Fig.21). The analog input switching circuit is shown in
Fig.3. The input for an analog CD player is explained in
more detail in Section 8.2.3.
8.2.3
T
HE ANALOG
CD
BLOCK
Special precautions are taken to realize a high
Common-ModeRejectionRatio(CMRR)incaseoftheuse
of a CD player output processed via analog inputs.
The block diagram is shown in Fig.4. The operational
amplifiers OAR and OAL are used as buffers. The gain of
these operational amplifiers can be adjusted via the
externalresistorsandisinthiscase 0.54byusinga8.2 k
and a 15 k
resistor.
The reference inputs of these operational amplifiers are
connected to a separate pin CDGND. This pin is on one
side AC connected to the ground shielding of the cable
coming from the CD player and via a resistor >1 M
to
pin VREFAD. In this configuration the common-mode
signal propagates all the way to the SCAD block inputs of
SCAD1 and SCAD2. The SCADs themselves have a good
rejection ratio for in-phase common-mode signals.
Which part of the common-mode signal is processed as
the real input signal depends on the ratio of the
CDGND resistor and the series resistor in the cable and
the difference in input offset of the operational amplifiers.
The induced signals on the CDLI and CDRI lines are of the
same amplitude and therefore rejected as common-mode
signals in the SCADs.
8.2.4
P
IN
VREFAD
The middle reference voltage of the SCAD1, SCAD2,
SCAD3 and level-ADC can be filtered via this pin.
This voltage is used as half the supply reference of the
SCAD1, SCAD2, SCAD3 and as the positive reference for
the level-ADC and buffers. External capacitors (connected
to V
SSA1
) prevent crosstalk between the SCADs and
buffers and improve the power supply rejection ratio of all
blocks. This pin must also be used as a reference for the
inputs AMAFL, AMAFR, TAPEL, TAPER and CDGND.
8.2.5
P
INS
VDACN1, VDACN2
AND
VDACP
These pins are used as ground and positive supply
reference for the SCAD1, SCAD2, SCAD3 and the
level-ADC. For optimal performance, pins VDACN1
and VDACN2 must be directly connected to the V
SSA1
and
pin VDACP to the filtered V
DDA1
.
Fig.4 Analog CD block.
handbook, full pagewidth
MGM124
LEFT
GROUND
CD-player
analog
output
15 k
RIGHT
15 k
8.2 k
8.2 k
1 M
73
CDLB
72
CDLI
77
CDGND
78
VREFAD
71
CDRB
70
CDRI
to SCAD2 via router
to SCADs and level-ADC
to SCAD1 via router
OAR
OAL
off-chip
on-chip
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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 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(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 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(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 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(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 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(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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