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P5200 View Datasheet(PDF) - Conexant Systems

Part NameDescriptionManufacturer
P5200 AccessRunner™ ADSL-USB Modem Device Set Conexant
Conexant Systems Conexant
P5200 Datasheet PDF : 56 Pages
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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.
P5200
USB
Interface
Controller
(UIC)
CX11627
ADSL
Data Pump
(ADDP)
Digital Section
Decimation
Filter
CX20431 Analog Front End (AFE)
Analog Section
ADC
Low Pass
Filter
AGC
Serial
Interface
Reference
Generators
Interpolation
Filter
DAC
SC Filter
AGC
High Pass
Filter
Hybrid
OpAmp
Low Pass
Filter
Figure 2-3. CX20431 AFE Block Diagram
Hybrid
CX20441
Line Driver
(LD)
100427 F2-3_BD_P20431
100427B
Conexant
2-5
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