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| 型号： | WJLXT388LEB2 |
| 厂商： | CORTINA SYSTEMS INC |
| 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： | 18/80页 |
| 文件大小： | 1017K |
| 代理商： | WJLXT388LEB2 |
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Dual T1/E1/J1 Transceiver — Intel
LXT388
Datasheet
25
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device. See Table 40 on page 54.
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 5 on
page 27 for the recommended external line circuitry.
2.3.1.2
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.
2.4
Line Protection
Figure 5 on page 27 shows recommended line interface circuitry. In the receive side, the 1 k
Ω
series resistors protect the receiver against current surges coupled into the device. Due to the high
receiver impedance (70 k
Ω typical) the resistors do not affect the receiver sensitivity. In the
transmit side, the Schottky diodes D1-D4 protect the output driver.While not mandatory for normal
operation, these protection elements are strongly recommended to improve the design robustness.
2.5
Driver Failure Monitor
The LXT388 transceiver incorporates a internal power Driver Failure Monitor (DFM) in parallel
with TTIP and TRING that is capable of detecting secondary shorts without cable. DFM is
available only in configurations with no transmit series resistors (T1 mode with TVCC=3.3V).
This feature is available in the serial and parallel host modes but not available in the hardware
mode of operation.
A capacitor, charged via a measure of the driver output current and discharged by a measure of the
maximum allowable current, is used to detect a secondary short failure. Secondary shorted lines
draw excess current, overcharging the cap. When the capacitor charge deviates outside the nominal
Table 6.
Line Length Equalizer Inputs
LEN2
LEN1
LEN0
Line Length1
Cable Loss2
Operation Mode
011
0 - 133 ft. ABAM
133 - 266 ft. ABAM
266 - 399 ft. ABAM
399 - 533 ft. ABAM
533 - 655 ft. ABAM
0.6 dB
1.2 dB
1.8 dB
2.4 dB
3.0 dB
T1
100
101
110
111
0
E1 G.703, 75
Ω coaxial cable and 120Ω twisted pair cable.
E1
1. Line length from LXT388 to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
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