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XRT83SL28
REV. 1.0.0
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
POWER AND GROUND (HOST AND HARDWARE MODES)
NAME
PIN
TYPE
DESCRIPTION
TVDD7
TVDD6
TVDD5
TVDD4
TVDD3
TVDD2
TVDD1
TVDD0
79
83
98
102
30
26
11
7
PWR
Transmit Analog Power Supply (3.3V ±5%)
TVDD can be shared with DVDD. However, it is recommended that TVDD be
isolated from the analog power supply RVDD. For best results, use an internal
power plane for isolation. If an internal power plane is not available, a ferrite
bead can be used. Each power supply pin should be bypassed to ground
through an external 0.1µF capacitor.
RVDD2
RVDD1
127
54
PWR
Receive Analog Power Supply (3.3V ±5%)
RVDD should not be shared with other power supplies. It is recommended that
RVDD be isolated from the digital power supply DVDD and the analog power
supply TVDD. For best results, use an internal power plane for isolation. If an
internal power plane is not available, a ferrite bead can be used. Each power
supply pin should be bypassed to ground through an external 0.1µF capacitor.
DVDD2
DVDD1
129
52
PWR
PWR
GND
Digital Power Supply (3.3V ±5%)
DVDD should be isolated from the analog power supplies except for TVDD.
For best results, use an internal power plane for isolation. If an internal power
plane is not available, a ferrite bead can be used. Every two DVDD power sup-
ply pins should be bypassed to ground through at least one 0.1µF capacitor.
DVDDcore
93
AVDD
16
Analog Power Supply (3.3V ±5%)
AVDD should be isolated from the digital power supplies. For best results, use
an internal power plane for isolation. If an internal power plane is not available,
a ferrite bead can be used. Each power supply pin should be bypassed to
ground through at least one 0.1µF capacitor.
TGND7
TGND6
TGND5
TGND4
TGND3
TGND2
TGND1
TGND0
77
85
96
104
32
24
13
5
Transmit Analog Ground
It’s recommended that all ground pins of this device be tied together.
RGND2
RGND1
126
55
GND
GND
Receive Analog Ground
It’s recommended that all ground pins of this device be tied together.
DGND2
DGND1
128
53
Digital Ground
It’s recommended that all ground pins of this device be tied together.
DGNDcore
88
AGND
18
GND
Analog Ground
It’s recommended that all ground pins of this device be tied together.
9
EXAR [ EXAR CORPORATION ]
