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参数资料
| 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： | 17/80页 |
| 文件大小： | 1017K |
| 代理商： | WJLXT388LEB2 |
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Intel
LXT388 — Dual T1/E1/J1 Transceiver
24
Datasheet
Each output driver is supplied by a separate power supply (TVCC and TGND). The transmit pulse
shaper is bypassed if no MCLK is supplied while TCLK is pulled high. In this case TPOS and
TNEG control the pulse width and polarity on TTIP and TRING. With MCLK supplied and TCLK
pulled high the driver enters TAOS (Transmit All Ones pattern). Note: The TAOS generator uses
MCLK as a timing reference. In order to assure that the output frequency is within specification
limits, MCLK must have the applicable stability.TAOS is inhibited during Remote Loopback.
2.3.0.1
Hardware Mode
In hardware mode, pins LEN0-2 determine the pulse shaping as described in Table 6 on page 25.
The LEN settings also determine whether the operating mode is T1 or E1. Note that in T1 operation
mode, all four ports will share the same pulse shaping setting. Independent pulse shaping for each
channel is available in host mode.
2.3.0.2
Host Mode
In Host Mode, the contents of the Pulse Shaping Data Register (PSDAT) determines the shape of
pulse output at TTIP/TRING. Refer to Table 28 on page 44 and Table 29 on page 44.
2.3.1
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,
spaces or if it is in transition. This well controlled dynamic impedance provides excellent return
loss when used with external precision resistors (± 1% accuracy) in series with the transformer.
2.3.1.1
Output Driver Power Supply
The output driver power supply (TVCC pins) can be either 3.3V or 5V nominal. When TVCC=5V,
LXT388 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 LXT388 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.
Figure 4. 50% AMI Encoding
TTIP
TRING
1
0
1
Bit Cell
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