参数资料
型号: WJLXT384LEB1
厂商: INTEL CORP
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封装: 20 X 20MM, ROHS COMPLIANT, LQFP-144
文件页数: 92/140页
文件大小: 1514K
代理商: WJLXT384LEB1
55
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
6.4.2.3
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal.
When TVCC=5V, theLXT384 Transceiver drives both E1 (75
Ω/120Ω) and T1 (100Ω) lines
through a 1:2 transformer and 11
Ω/9.1Ω series resistors.
When TVCC=3.3V, the LXT384 Transceiver drives E1 (75
Ω/120Ω) lines through a 1:2
transformer and 11
Ω series resistor. Use a configuration with a 1:2 transformer and without
series resistors to drive T1 100
Ω lines.
The Channel 4 (TVCC4) power supply pin sets 3.3V or 5.0V transmit operation. See Table 21.
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device.
However, 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.
Refer to Figure 6 for the recommended external line circuitry.
6.4.2.4
Power Sequencing
For the LXT384 Transceiver, sequence TVCC first, then VCC second or at the same time as
TVCC, to prevent excessive current draw.
6.4.3
Transmitter Outputs
A transmitter transmits output signals as follows:
1. Through a step-up transformer, a transmitter transmits an output signal, typically to either a
twisted-pair or a coaxial cable. (For transformer specifications, see Figure 6 and Chapter 12.0,
2. One polarity of the output signal (the positive pulse) is transmitted at TTIP, and the other
polarity (the negative pulse) is transmitted at TRING.
Note:
If TCLK is not supplied, the transmitter is in a powered-down state and the TTIP and TRING
outputs are held in a low-power high-impedance tristate.
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WJLXT384LEB1 DATACOM, PCM TRANSCEIVER, PQFP144
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