XRT82D20_06 Datasheet, PDF (6/27 Pages) Exar Corporation – SINGLE CHANNEL E1 LINE INTERFACE UNIT

XRT82D20
SINGLE CHANNEL E1 LINE INTERFACE UNIT
REV. 1.0.8
PIN #
22
23
24
25
26
27
28
SYMBOL
TTIP
TxLEV
AVDD
AGND
MuteRx
RRing
RTIP
TYPE
O
I
-
-
I
I
I
DESCRIPTION
Transmitter TIP Output:
Positive bipolar data output to the line.
Transmit Level:
Tie this pin high for 120 Ω twisted pair cable operation and tie it low for 75 Ω coaxial
cable operation (internal pull-down). This pin is only active for 5.0V operation.
Analog Positive Supply
5.0 V + 5% or 3.3 V+ 5%
Analog Supply Ground
Mute Receive Output:
With this pin tied high, a loss of receive input signal (RLOS=0) will cause ClkLOS to
go low and generate the following.
Dual-rail mode operation:
With DIGI = 0, RClk = 1, RPOS and RNEG/RData = 0
fWith DIGI = 1, RClk =0, RPOS and RNEG/RData = 1
Single-rail mode:
RClk = 1 and RData=0
(internal pull-down)
Receive Bipolar Negative Input:
Bipolar line signal input to the receiver.
Receiver Bipolar Positive Input:
Bipolar line signal input to the receiver.
5