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参数资料
型号： SAA7706H
厂商： NXP Semiconductors N.V.
元件分类： 数字信号处理
英文描述： Car radio Digital Signal Processor (DSP)
封装： SAA7706H/N109S<SOT318-2 (QFP80)|<<http://www.nxp.com/packages/SOT318-2.html<1<Always Pb-free,;SAA7706H/N109S<SOT318-2 (QFP80)|<<http://www.nxp.com/packages/SOT318-2.html&
文件页数： 13/52页
文件大小： 271K
代理商： SAA7706H
2001 Mar 05
13
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
8.1.1
T
HE 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
thecommon modesignal. The ADCitselfwill suppress this
commonmodesignalwithahighrejectionratio.Theinputs
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
11
G1
G0
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
MUX
Fig.4 Example of the use of common mode analog input in combination with input resistor tap.
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SAA7706H/N107 功能描述:数字信号处理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
SAA7706H/N107,518 功能描述:数字信号处理器和控制器 - DSP, DSC DIRAC-1 RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
SAA7706H/N107,557 功能描述:数字信号处理器和控制器 - DSP, DSC DIGITAL SIGNAL RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
SAA7706H/N107S,518 功能描述:数字信号处理器和控制器 - DSP, DSC CAR RADIO DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
SAA7706H/N107S,557 功能描述:数字信号处理器和控制器 - DSP, DSC INTEGRATED RDS/TMC RECEIVER RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
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