- 您现在的位置：买卖IC网 > PDF目录369885 > LXT386LE PCM TRANSCEIVER|QUAD|CEPT PCM-30/E-1|CMOS|QFP|100PIN|PLASTIC PDF资料下载
参数资料
| 型号： | LXT386LE |
| 英文描述： | PCM TRANSCEIVER|QUAD|CEPT PCM-30/E-1|CMOS|QFP|100PIN|PLASTIC |
| 中文描述： | 的PCM收发器|四|优税PCM-30/E-1 |的CMOS | QFP封装| 100引脚|塑料 |
| 文件页数： | 27/80页 |
| 文件大小： | 1112K |
| 代理商： | LXT386LE |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页
Octal T1/E1/J1 Transceiver
—
LXT384
Datasheet
27
2.3.1.3
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal. When TVCC=5V,
LXT384 drives both E1 (75
/120
)
and T1 100
lines through a 1:2 transformer and 11
/
9.1
series resistors.
When TVCC=3.3V, the LXT384 drives E1 (75
/120
)
lines through a 1:2 transformer and 11
series resistor. A configuration with a 1:2 transformer and without series resistors should be used to
drive T1 100
lines.
The Channel 4 (TVCC4) power supply pin is used to determine 3.3V or 5.0V transmit operation.
Removing the series resistors for T1 applications with TVCC=3.3V, improves the power
consumption of the device. See
Table 36
.
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 6
for the recommended external line circuitry.
2.3.1.4
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
Driver Failure Monitor
The LXT384 transceiver incorporates an 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 2. Line Length Equalizer Inputs
LEN2
LEN1
LEN0
Line Length
1
Cable Loss
2
Operation Mode
0
1
1
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
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
E1 G.703, 75
coaxial cable and 120
twisted pair
cable.
E1
1. Line length from LXT384 to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
相关PDF资料 |
PDF描述 |
|---|---|
| LXT388LE | PCM TRANSCEIVER|DUAL|CEPT PCM-30/E-1|CMOS|QFP|100PIN|PLASTIC |
| LXT400JE | Hermetically Sealed, 3.3V, High Speed, High CMR, Logic Gate Optocoupler |
| LXT6155LE | Telecomm/Datacomm |
| LXT6251A | ATM/SONET MAPPER|CMOS|QFP|208PIN|PLASTIC |
| LXT903PC | LAN Transceiver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LXT388LE | 制造商:未知厂家 制造商全称:未知厂家 功能描述:PCM TRANSCEIVER|DUAL|CEPT PCM-30/E-1|CMOS|QFP|100PIN|PLASTIC |
| LXT400 | 制造商:LVL1 制造商全称:LVL1 功能描述:All Rate Extended Range Switched 56/DDS Transceiver |
| LXT400JE | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Transceiver Circuit For Telecommunications |
| LXT441 | 制造商:LVL1 制造商全称:LVL1 功能描述:Switched 56/DDS Integrated DSU/CSU |
| LXT6155 | 制造商:INTEL 制造商全称:Intel Corporation 功能描述:155 Mbps SDH/SONET/ATM Transceiver |
发布紧急采购，3分钟左右您将得到回复。