參數(shù)資料
型號(hào): XRT82D20IW
廠商: Exar Corporation
文件頁(yè)數(shù): 13/27頁(yè)
文件大?。?/td> 0K
描述: IC LIU EI SGL 28SOJ
標(biāo)準(zhǔn)包裝: 27
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: E1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 28-BSOJ
供應(yīng)商設(shè)備封裝: 28-SOJ
包裝: 管件
XRT82D20
19
SINGLE CHANNEL E1 LINE INTERFACE UNIT
REV. 1.0.8
1.6
Capacitively-coupling the Receive Section(s) of the XRT82D20 to the line
Capacitive coupling provides a lower cost interface to the line. It must be noted that the line isolation is limited
to the breakdown voltage of the capactior versus the typical transformer isolation of 1,500 to 3,000 volts. With
a capacitor there is also no DC isolation to ground as there is with with a transformer.
Applications that are not sensitive to these issues can benefit from the lower cost approach of using capacitor
coupling on the receive input.
the recommended schematics for capacitively
coupling the receiver to the line.
NOTE: Resistive divider attenuates the input signal by one-half for both 75
and 120 applications.
FIGURE 14. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 75 OHM APPLICATION AND 3.3V SUPPLY
R Load
75
75
Coax
75
Coax
75
Signal
Source
37.4
37.4
9.1
9.1
2:1
RTIP
RRING
TTIP
TRING
+3.3 V
0.1
F
TVDD
AVDD
TxLEV
TNEG/CODE
TPOS/TData
TClk
RPOS/RData
RNEG/LCV
RClk
AGND
TGND
10
F
Rx Input
Tx Output
0.1
F
0.1
F
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