参数资料
型号: DS21Q50LN
厂商: Maxim Integrated Products
文件页数: 53/87页
文件大小: 0K
描述: IC TRANSCEIVER E1 QD IND 100LQFP
产品培训模块: Lead (SnPb) Finish for COTS
产品变化通告: Product Discontinuation 20/Feb/2012
标准包装: 90
功能: 收发器
接口: E1
电路数: 4
电源电压: 3.14 V ~ 3.47 V
电流 - 电源: 230mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-LQFP
供应商设备封装: 100-LQFP(14x14)
包装: 托盘
包括: AIS 警报检测器和发生器,回送功能,PRBS 发生器 / 检测器,远程检测器和发生器
DS21Q50
57 of 87
16.2Termination
The DS21Q50 is designed to be fully software-selectable for 75
W and 120W termination without the need
to change any external resistors. The user can configure the DS21Q50 for 75
W or 120W receive
termination by setting the IRTSEL (CCR5.4) bit. When using the internal termination feature, the
external termination resistance should be 120
W (typically two 60W resistors). Setting IRTSEL = 1 causes
the DS21Q50 to internally apply parallel resistance to the external resistors in order to adjust the
termination to 75
W. See Figure 16-3 for details.
16.3Receive Monitor Mode
When connecting to a monitor port, a large resistive loss is incurred due to the voltage divider between
the E1 line termination resistors (Rt) and the monitor port isolation resistors (Rm) as shown in
Figure 16-1. The four receivers of the DS21Q50 can provide gain to overcome the resistive loss of a
monitor connection. This is typically a purely resistive loss/gain and should not be confused with the
cable loss characteristics of an E1 transmission line. By setting the receive monitor mode register as
shown in Table 16-1, the receiver can be programmed to provide 30dB of gain.
Figure 16-1. Typical Monitor Port Application
PRIMARY
E1 TERMINATING
DEVICE
Rm
MONITOR
PORT JACK
E1 LINE
X
F
M
R
Rt DS21Q50
SECONDARY
TERMINATING
DEVICE
Table 16-1. Receive Monitor Mode Gain
MONITOR MODE
(ADDRESS = 1Fh) REGISTER
VALUE
GAIN (dB)
70h
30
00h
0
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