参数资料
型号: WJLXT386LEB2
厂商: INTEL CORP
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP100
封装: 14 X 14MM, ROHS COMPLIANT, LQFP-100
文件页数: 22/86页
文件大小: 1081K
代理商: WJLXT386LEB2
QUAD T1/E1/J1 Transceiver — LXT386
Datasheet
29
3.3.2
Transmit Pulse Shaping
The transmitted pulse shape is internally generated using a high speed D/A converter. Shaped
pulses are further applied to the line driver for transmission onto the line at TTIP and TRING. The
line driver provides a constant low output impedance regardless of whether it is driving marks.
3.3.2.1
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal. When TVCC=5V,
LXT386 drives both E1 (75
Ω/120Ω) and T1 100Ω lines through a 1:2 transformer and 11Ω/9.1Ω
series resistors.
When TVCC=3.3V, the LXT386 drives E1 (75
Ω/120Ω) lines through a 1:2 transformer and 11Ω
series resistor. A configuration with a 1:2 transformer and without series resistors should be used to
drive T1 100
Ω lines.
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device. See Table 35.
On the other hand, series resistors in the transmit configuration improve the transmit return loss
performance. Good transmit return loss performance minimizes reflections in harsh cable
environments. In addition, series resistors provide protection against surges coupled to the device.
The resistors should be used in systems requiring protection switching without external relays.
Please refer to Figure 7 for the recommended external line circuitry.
3.3.2.2
Power Sequencing
For the LXT384, we recommend sequencing TVCC first then VCC second or at the same time as
TVCC to prevent excessive current draw.
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