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參數(shù)資料
| 型號： | SAA7708H |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Car Radio Digital Signal Processor |
| 中文描述： | 汽車無線電數(shù)字信號處理器 |
| 文件頁數(shù)： | 17/60頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7708H |
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1998 May 19
17
Philips Semiconductors
Preliminary specification
Car Radio Digital Signal Processor
SAA7708H
10.2.5
T
HE REALISATION OF COMMON MODE INPUTS
A high Common Mode Rejection Ratio can be created by the use of the either the AUX_GND or the CD_GND pin. One
of these pins can be connected via the switches s10 and s11 (see Fig. 5) to the plus input of the second opamp in the
signal path of TAPE, CD or AM. The signal of which a high common mode rejection ratio is required has one signal (or
two signals) and a common signal as input. The common signal is connected to either the AUX_GND or CD_GND input
and for the specific mode selected with the switches 10 and 11. This means that on both signal lines going to the SCAD
will contain the common mode signal. The AD’s itself will suppress this common mode signal very effectively and this is
the way good common mode signal suppression is achieved. The switches needed are drawn in the appropriate position.
The inputs CD_LI and CD_RI get in this example a diminished input signal by the external resistor tap of 8k2 and 10k.
The 10k resistors provides together with the 1 M resistor from CD_GND to VREFAD also the biasing of the opamps OA1
and OA2. If no external resistor tap is needed still resistors will be needed between the signal inputs and the CD_GND
pin. The CD_GND pin is in this configuration connected to the plus input of the opamps OA3 and OA4. Biasing of the
opamps OA3 and OA4 is again provided by the 1 M resistor to VREFAD. In this construction the common mode signals
on CD_LI / CD_RI and the CD_GND pin will be unchanged in amplitude being present at the AD input and the common
mode rejection behaviour of these AD will provide a good common mode rejection ratio. The other common mode input
AUX_GND can in the same way be used.
Fig. 5 Example of the use of common mode analog input
10k
10k
10k
8k2
10k
10k
10k
10k
8k2
10k
1 M
CD_LI
CD_GND
VREFAD
CD_RI
ON CHIP
OFF CHIP
GROUND
CD PLAYER
CABLE
RIGHT
LEFT
CD PLAYER
CD PLAYER
TO SCAD1
TO SCAD2
or SCAD1
TO SCAD1
TO SCAD2
or SCAD1
OA1
OA2
OA3
OA4
s10
s11
s1
s4
s2
s5
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| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音頻 DSP DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,518 | 功能描述:音頻 DSP DIRAC-2 RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,557 | 功能描述:音頻 DSP DIGITAL SIGNAL RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103/S420 | 功能描述:音頻 DSP Car radio Digital Signal Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
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