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| 型号： | DS3150TNC1+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC LIU DS3/E3/STS-1 48-LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 250 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 1/1 |
| 规程： | DS3 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 管件 |
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DS3150
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1.1 Receiver
Interfacing to the Line. The receiver can be transformer-coupled or capacitor-coupled to the line.
Typically, the receiver interfaces to the incoming coaxial cable (75
W) through a 1:2 step-up transformer.
Figure 1-2 shows the arrangement of the transformer and other recommended interface components. The
device expects the incoming signal to be in B3ZS- or HDB3-coded AMI format.
Optional Preamp. The receiver can be used in monitoring applications, which typically have series
resistors that result in a resistive loss of approximately 20dB. When the RMON input pin is high, the
receiver compensates for this resistive loss by applying flat gain to the incoming signal before sending the
signal to the equalizer block.
Adaptive Equalizer. The adaptive equalizer applies both frequency-dependent gain and flat gain to
offset signal losses from the coaxial cable and provides a signal of nominal amplitude and pulse shape to
the clock and data recovery block. The equalizer circuitry automatically adapts to coaxial cable losses
from 0 to 15dB, which translates into 0 to 380 meters (DS3), 0 to 440 meters (E3), or 0 to 360 meters
(STS-1) of coaxial cable (AT&T 734A or equivalent). The equalizer can perform direct (0 meter)
monitoring of the transmitter output signal.
Clock and Data Recovery. The clock and data recovery (CDR) block takes the amplified, equalized
signal from the equalizer and produces separate clock, positive data and negative data signals. The CDR
requires a master clock (44.736MHz for DS3, 34.368MHz for E3, 51.840MHz for STS-1). If the signal
on MCLK is toggling, the device selects the MCLK signal as the master clock. If MCLK is wired high or
left floating, the device uses the signal on the TCLK pin as the master clock. If MCLK is wired low, the
device takes its master clock from an internal oscillator. The selected master clock is also used by the
jitter attenuator.
Loss-of-Signal Detector. The receiver contains both analog and digital LOS detectors. The analog
LOS detector resides in the equalizer block. If the incoming signal level is less than a signal level
approximately 24dB below nominal, analog loss-of-signal (ALOS) is declared. The ALOS signal cannot
be directly examined, but when ALOS occurs the equalizer squelches the recovered data, forcing all zeros
out of the clock and data recovery circuitry and subsequently causing digital loss-of-signal (DLOS),
which is indicated on the
LOS pin. ALOS clears when the incoming signal level is greater than or equal
to a signal level approximately 18dB below nominal.
The digital loss-of-signal detector declares DLOS when it detects 175
±75 consecutive zeros in the
recovered data stream. When DLOS occurs, the receiver asserts the
LOS pin. DLOS is cleared when there
are no excessive zero occurrences over a span of 175
±75 clock periods. An excessive zero occurrence is
defined as three or more consecutive zeros in the DS3 and STS-1 modes and four or more consecutive
zeros in the E3 mode. The
LOS pin is deasserted when the DLOS condition is cleared.
The requirements of ANSI T1.231 and ITU-T G.775 for DS3 LOS defects are met by the DLOS detector,
which asserts
LOS when it counts 175
±75 consecutive zeros coming out of the clock and data recovery
block and clears
LOS when it counts 175
±75 consecutive pulse intervals without excessive zero
occurrences.
The requirements of ITU-T G.775 for E3 LOS defects are met by a combination of the ALOS detector
and the DLOS detector as follows:
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3150TNC1+ | 功能描述:网络控制器与处理器 IC 3.3V DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS3151 | 功能描述:网络控制器与处理器 IC Single DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS3151_07 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| DS3151+ | 功能描述:网络控制器与处理器 IC Single DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS3151N | 功能描述:网络控制器与处理器 IC Single DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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