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CX20431-21 参数 Datasheet PDF下载

CX20431-21图片预览
型号: CX20431-21
PDF下载: 下载PDF文件 查看货源
内容描述: AccessRunner ADSL -USB调制解调器设备设置 [AccessRunner ADSL-USB Modem Device Set]
分类和应用: 调制解调器
文件页数/大小: 56 页 / 363 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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AccessRunner ADSL-USB Modem Device Set Data Sheet  
2.3.3  
CX20431 AFE Description  
The CX20431 Analog Front End (AFE) can support full-rate and G.lite (G.992.2) ADSL modems. The CX20431 AFE  
interfaces with the CX20441 LD and the hybrid receive circuitry on the analog side, and with the CX11627 ADDP on the  
digital side.  
The receive section filters out the unwanted echo and boosts the wanted signal before performing an analog-to-digital (A/D)  
conversion.  
The transmit section converts digital data to analog signals and performs a smoothing operation before presenting the signals  
to the line driver.  
Wakeup in G.lite mode is supported by tone detection circuitry integrated in the CX20431 AFE.  
The CX20431 operates from a +3.3V supply.  
A block diagram of the CX20431 AFE is shown in Figure 2-3.  
CX20431 Analog Front End (AFE)  
Digital Section  
Analog Section  
AGC  
P5200  
USB  
Decimation  
Low Pass  
Filter  
High Pass  
Filter  
Hybrid  
OpAmp  
ADC  
Hybrid  
Filter  
Interface  
Controller  
(UIC)  
Serial  
Interface  
Reference  
Generators  
CX11627  
ADSL  
Data Pump  
(ADDP)  
CX20441  
Line Driver  
(LD)  
Interpolation  
Filter  
Low Pass  
Filter  
SC Filter  
AGC  
DAC  
100427 F2-3_BD_P20431  
Figure 2-3. CX20431 AFE Block Diagram  
Conexant  
100427B  
2-5  
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