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| 型号： | SAA7706H/N107,557 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 5/52页 |
| 文件大小： | 0K |
| 描述： | IC CAR RADIO DSP 80-QFP |
| 标准包装： | 330 |
| 类型： | 汽车信号处理器 |
| 接口： | I²C，I²:S，LSB，SPDIF |
| 电压 - 输入/输出： | 3.30V |
| 电压 - 核心： | 3.30V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-BQFP |
| 供应商设备封装： | 80-QFP（14x20） |
| 包装： | 托盘 |
| 其它名称： | 935267098557 SAA7706H/N107 SAA7706H/N107-ND |
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2001 Mar 05
13
Philips Semiconductors
Product specication
Car radio Digital Signal Processor (DSP)
SAA7706H
8.1.1
THE REALIZATION OF COMMON MODE INPUT WITH
AIC
A high common mode rejection ratio can be created by the
use of the ground return pin. Pin CD_(L)_GND can be
used in the case that the left and right channel have one
ground return line. CD_(L)_GND and CD_R_GND can be
used for separated left and right ground return lines. The
ground return lines can be connected via the switch
GNDC1/2 and GNDRC1/2 (see Fig.4) to the plus input of
the second operational amplifier in the signal path. The
signal of which a high common mode rejection ratio is
required has a signal and a common signal as input. The
common signal is connected to the CD_(L)_GND and/or
CD_R_GND input. The actual input can be selected with
audio input control AIC1/2(1:0).
In Fig.4 the CD input is selected. In this situation both
signal lines going to S1/2 in front of the ADC will contain
the common mode signal. The ADC itself will suppress this
common mode signal with a high rejection ratio. The inputs
CD_L and CD_R in this example are connected via an
external resistor tap of 82 k
and 100 k to be able to
handle larger input signals. The 100 k
resistors are
needed to provide a DC biasing of the operational
amplifiers OA1 and OA2. The 1 M
resistor provides
DC biasing of OA3 and OA4. If no external resistor tap is
needed the resistors of 100 k
and 1 M still have to
provide DC biasing. Only the 82 k
resistor can be
removed. The impedance level in combination with
parasitic capacitance at input CD_L or CD_R determines
for a great deal the achievable common rejection ratio.
handbook, full pagewidth
MGT460
72
CD_L
77
CD_(L)_GND
OA2
OA4
78
VREFAD
14
to MUX S1/2
AIC1/2(1:0)
GNDC1/2
GNDRC1/2
00
01
10
G1
G0
11
CD_R_GND
70
CD_R
on-chip
off-chip
RIGHT
LEFT
GROUND
RIGHT
from
CD-player
analog
GROUND
LEFT
10 k
82 k
82 k
1 M
1 M
100 k
100 k
10 k
10 k
MIDREF
OA1
OA3
to MUX S1/2
10 k
10 k
10 k
00
01
10
11
MUX
Fig.4 Example of the use of common mode analog input in combination with input resistor tap.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAA7707H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Car radio Digital Signal Processor CDSP |
| SAA7708H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Car Radio Digital Signal Processor |
| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音频 DSP DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| SAA7709H/N103,518 | 功能描述:音频 DSP DIRAC-2 RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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