參數(shù)資料
型號： DS21Q50L
廠商： Maxim Integrated Products
文件頁數(shù)： 53/87頁
文件大?。?/td> 0K
描述： IC TRANSCEIVER E1 QUAD 100-LQFP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
產(chǎn)品變化通告： Product Discontinuation 20/Feb/2012
標(biāo)準(zhǔn)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： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 100-LQFP
供應(yīng)商設(shè)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(yuǎn)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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21Q50L+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q50L-C01 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS21Q50LN 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q50LN+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q50L-W+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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