XRT82D20 Datasheet, PDF (7/27 Pages) Exar Corporation – SINGLE CHANNEL E1 LINE INTERFACE UNIT

XRT82D20 SINGLE CHANNEL E1 LINE INTERFACE UNIT
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REV. 1.0.7
PIN #
24
25
26
SYMBOL
AVDD
AGND
MuteRx
27
RRing
28
RTIP
TYPE
-
-
I
I
I
Analog Positive Supply
5.0 V + 5% or 3.3 V+ 5%
Analog Supply Ground
DESCRIPTION
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.
FIGURE 3. INTERFACE TIMING DIAGRAM IN BOTH SINGLE-RAIL AND DUAL-RAIL MODE, WITH DIGI (PIN 17) = “0”
TClk
TClk
t_r
t_f
TPOS/TData
or
TNEG/CODE
t_TSU
t_THO
Active High
RClk
t_RCD
RPOS/RData
or
RNEG/LCV
t_r
t_RSU
t_RHO
t_f
Active High
5