參數(shù)資料
型號： DS21Q50L+
廠商： Maxim Integrated Products
文件頁數(shù)： 55/87頁
文件大?。?/td> 0K
描述： IC TXRX E1 QUAD 100-LQFP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
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： 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，遠程檢測器和發(fā)生器
DS21Q50
59 of 87
16.4 Transmit Waveshaping and Line Driving
The DS21Q50 uses a set of laser-trimmed delay lines with a precision digital-to-analog converter (DAC)
to create the waveforms that are transmitted onto the E1 line. The waveforms meet the ITU G.703
specifications (Figure 16-4). The user selects which waveform is to be generated by properly
programming the L2/L1/L0 bits in the LICR. The DS21Q50 can be set up in a number of various
configurations, depending on the application (Table 16-3).
Table 16-3. Line Build-Out Select in LICR
L2 L1
L0
APPLICATION
TRANSFORMER
RETURN LOSS*
RT**()
0
75
W normal
1:2 step-up
NM
0
1
120
W normal
1:2 step-up
NM
0
1
0
75
W with protection resistors
1:2 step-up
NM
2.5
0
1
120
W with protection
resistors
1:2 step-up
NM
2.5
1
0
75
W with high return loss
1:2 step-up
21dB
6.2
*NM = Not Meaningful (return loss value too low for significance).
**Refer to Application Note 336: Transparent Operation on T1, E1 Framers and Transceivers for details on E1 line interface design.
Because of DS21Q50 transmitter’s design, very little jitter (less than 0.005 UIP-P broadband from 10Hz to
100kHz) is added to the jitter present on TCLK (or source used for transmit clock). The waveform created
is independent of the duty cycle of TCLK. The transmitter in the device couples to the E1 transmit-
shielded twisted pair or coax through a 1:2 step-up transformer, as shown in Figure 16-2. For the devices
to create the proper waveforms, the transformer must meet the specifications listed in Table 16-4. The
line driver in the device contains a current limiter that prevents more than 50mA (RMS) from being
sourced in a 1 load.
Table 16-4. Transformer Specifications
SPECIFICATION
RECOMMENDED VALUE
Turns Ratio
1:1 (receive) and 1:2 (transmit) ±3%
Primary Inductance
600
mH minimum
Leakage Inductance
1.0
mH maximum
Intertwining Capacitance
40pF maximum
DC Resistance
1.2
W maximum
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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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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