參數(shù)資料
型號: DS21Q50LN
廠商: Maxim Integrated Products
文件頁數(shù): 53/87頁
文件大?。?/td> 0K
描述: IC TRANSCEIVER E1 QD IND 100LQFP
產品培訓模塊: Lead (SnPb) Finish for COTS
產品變化通告: Product Discontinuation 20/Feb/2012
標準包裝: 90
功能: 收發(fā)器
接口: E1
電路數(shù): 4
電源電壓: 3.14 V ~ 3.47 V
電流 - 電源: 230mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應商設備封裝: 100-LQFP(14x14)
包裝: 托盤
包括: AIS 警報檢測器和發(fā)生器,回送功能,PRBS 發(fā)生器 / 檢測器,遠程檢測器和發(fā)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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