XRT82D20 Datasheet, PDF (22/27 Pages) Exar Corporation – SINGLE CHANNEL E1 LINE INTERFACE UNIT

áç
SINGLE CHANNEL LINE INTERFACE UNIT XRT82D20
REV. 1.0.7
FIGURE 16. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 75 Ω APPLICATION AND 5V SUPPLY
75 Ω Coax
75 Ω
Signal
Source
75 Ω Coax
R Load
75 Ω
0.1 µF
37.4 Ω
0.1 µF
RTIP
Rx Input
RRING
1.36:1
15.4 Ω
TTIP
Tx Output
15.4 Ω
TRING
RPOS/RData
RNEG/LCV
RClk
TVDD
AVDD
10 µF
TxLEV
TGND
AGND
+5 V
0.1 µF
TNEG/CODE
TPOS/TData
TClk
NOTE: Resistive divider attenuates the input signal by one-
half for both 75 Ω and 120 Ω applications.
20