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CX28333-1X 参数 Datasheet PDF下载

CX28333-1X图片预览
型号: CX28333-1X
PDF下载: 下载PDF文件 查看货源
内容描述: 单/双/三E3 / DS3 / STS - 1线路接口单元 [Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit]
分类和应用: 电信集成电路PC
文件页数/大小: 68 页 / 549 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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2.0 Functional Description  
CX28331/CX28332/CX28333  
2.5 Additional CX2833i Functions  
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
2.5 Additional CX2833i Functions  
2.5.1 Bias Generator  
To achieve good isolation between the channels, each channel utilizes an  
independent power and ground to both transmit and receive. Additionally, each  
channel has its own band gap voltage reference. Because only one external  
resistor for current generation exists, only one band gap voltage can be used. The  
band gap from Ch1 has been chosen for this task.  
The 12.1 kexternal resistor from pin RBIAS to ground, is specified to have  
a tolerance of ±1%. This helps to keep tighter control on power dissipation and  
circuit performance.  
NOTE: Capacitance should be kept to a minimum on the RBIAS pin.  
2.5.2 Power-On Reset (POR)  
A POR function is provided in the CX2833i device to ensure all of the resettable  
digital logic and analog control lines are starting from a known state. This circuit  
uses a fixed RC timer (~1µs); additionally, 128 clocks from REFCLK are counted  
(after the RC timer has timed-out) before reset is deasserted, which begins timing  
after a minimum supply voltage is reached (see Table 2-4).  
2.5.3 Loopback Multiplexers (MUXes)  
Two loopback MUXes per channel in the CX2833i allow for local loopback  
(terminal or framer side), remote loopback (cable side), or both (the AIS signal  
follows the same path as the transmit data during loopback). The RLOS signal  
monitors the RX cable inputs irrespective of any loopback.  
In remote loopback, set by asserting pin RLOOP high, the receive data  
(retimed after clock recovery but not decoded) loops back into the pulse shaper in  
place of the transmit data. Additionally, this data sent out the RPOS, RNEG, and  
RCLK pins.  
In local loopback, set by asserting pin LLOOP, the transmit data loops back  
immediately from the encoder output to the decoder input in place of the received  
data. Additionally, this data is sent out the TLINEP and TLINEM/N pins.  
2-16  
Conexant  
100985A  
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