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参数资料
| 型号： | DS2290 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Telecom IC:Other |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, SMA30 |
| 文件页数： | 2/9页 |
| 文件大小： | 100K |
| 代理商： | DS2290 |
DS2290
022798 2/9
OVERVIEW
The DS2290 contains all the isolation and surge protec-
tion required to connect equipment to T1 lines. The Iso-
lation Stik has a receive and a transmit section. (See
Figure 1.) In the receive section, inputs RXTIP and
RXRING are connected directly to the receive T1
twisted pair. These inputs are terminated at 100 ohms.
The T1 signal received at RXTIP and RXRING is
coupled through a 2:1 transformer and presented at the
RX+ and RX– outputs. See Figure 2. There is a full
1500 volts of isolation between the Network Side pins
and the Customer Side pins.
In the transmit section, data that is to be transmitted is
sourced from either the TPOS and TNEG inputs or the
LPOS and LNEG inputs. The Data Mux will transmit
data at the TCLK rate from the TPOS and TNEG inputs if
the LB pin is either tied low or left open. It will transmit
data at the LCLK rate from the LPOS and LNEG inputs if
the LB pin is tied high. In order to comply with the latest
T1 standards, the clock presented at either TCLK or
LCLK must be at a 1.544 MHz rate (
±32 ppm) and must
not jitter beyond 0.05 unit intervals peak–to–peak
(UIpp). TPOS and TNEG can be tied together if the
source of the transmit data is in a NRZ format. The
DS2290 will automatically sense that these inputs are
tied together and will create a bipolar data stream from
them. The same holds true for the LPOS and LNEG in-
puts.
Data out of the Data Mux is passed to a B8ZS encoder
and AIS generator. If the B8ZS pin is tied high, then the
DS2290 will properly encode the transmit data stream
for the B8ZS zero code suppression scheme. If the
B8ZS pin is tied low or left open, the DS2290 will not en-
code the transmit data for B8ZS. Also, the DS2290 can
be configured to transmit an AIS (Alarm Indication Sig-
nal). If the TAIS pin is tied high, the DS2290 will transmit
an unframed, all ones signal at either the TCLK (LB=0 )
or LCLK (LB=1) rate.
The data to be transmitted is fed to the line driver. The
line driver creates the T1 pulse that will be transmitted.
The line build out pins LB0 to LB2 select whether the
output pulse level will be 0, –7.5, or –15 dB (see Table
3). If 0 dB of build out is selected, the output pulse will
conform to the shape described in Figure 2. This pulse
shape is congruent with the latest T1 specifications
such as TR 62411 and T1.403–1989. If the –7.5 dB or
–15 dB line build outs are selected, then the pulse
shown in Figure 3 will be attenuated according to the
transfer function as described in FCC Part 68, Subpart
D. Once the T1 pulse has been created, it is then trans-
mitted onto the transmit T1 twisted pair via the TTIP and
TRING outputs.
The DS2290 contains provisions for line powering. If
the DS2290 is to be powered from the T1 line using a DC
simplex power arrangement, then an external DC–to–
DC converter can connected to the LPWR+ and LPWR–
pins. Requirements for line powering are currently be-
ing relaxed and will be totally removed in the future. If
the DS2290 is not line powered, the LPWR+ and
LPWR– pins should be tied together.
Figure 4 shows a typical application using the DS2290.
The transmit and receive T1 twisted pairs are connected
directly to the DS2290. The DS2291 T1 Long Loop Stik
recovers clock and data from the protected signal pro-
vided by the Isolation Stik. The DS2180A T1 Transceiv-
er frames to the recovered data and interfaces to the
system backplane. The DS2250 Soft Microcontroller
Stik is used to control and monitor the status of the other
devices.
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相关代理商/技术参数 |
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| DS2291 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Clock/Data Recovery |
| DS2291/87-22291-000 | 功能描述:网络控制器与处理器 IC T1 Long Loop Stik 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 |
| DS229E | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| DS229E/T&R | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| DS229E+ | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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