XRT91L81IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT91L81IB' PDF : 40 Pages View PDF
XRT91L81
2.488/2.666GBPS OC-48/STM-16 SONET/SDH TRANSCEIVER
REV. P1.0.3
PRELIMINARY
POWER AND GROUND
NAME
VDDD3.3
TYPE
PWR
PIN
A8, A13, B13, D9, D10,
D11, E11, P13, P14
DESCRIPTION
Digital 3.3V Power Supply
VDDD3.3 should be isolated from the analog power supplies. For
best results, use a ferrite bead along with an internal power plane
separation. The VDDD3.3 power supply pins should have bypass
capacitors to the nearest ground.
AVDD3.3_Rx PWR
D3, E3
Analog 3.3V Receiver Power Supply
AVDD3.3_Rx should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD3.3_Rx power supply pins should
have bypass capacitors to the nearest ground.
AVDD3.3_Tx PWR
J1, M2, P5, P9
Analog 3.3V Transmitter Power Supply
AVDD3.3_Tx should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The TVDD3.3_Tx power supply pins should
have bypass capacitors to the nearest ground.
VDD1.8
PWR
AVDD1.8_Rx PWR
B7, D12, E12, K11, L9,
L10, M9, M10, M11
D4, D5, D6, D8, F3, G3
Digital 1.8V Power Supply
VDDD1.8 should be isolated from the analog power supplies. For
best results, use a ferrite bead along with an internal power plane
separation. The VDDD1.8 power supply pins should have bypass
capacitors to the nearest ground.
Analog 1.8V Receiver Power Supply
AVDD1.8_Rx should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD1.8_Rx power supply pins should
have bypass capacitors to the nearest ground.
AVDD1.8_Tx PWR
J4, L6, L7, L8, M3, N9
Analog 1.8V Transmitter Power Supply
AVDD1.8_Tx should be isolated from the digital power supplies.
For best results, use a ferrite bead along with an internal power
plane separation. The AVDD1.8_Tx power supply pins should
have bypass capacitors to the nearest ground.
DGND
GND
A4, A5, A12, B3, B4, B8,
B11, B12, F11, F12, G11,
G12, G13, G14, H11, H12,
J11, J12, K12, L3, L11,
L12, P12
Digital Ground for 3.3V / 1.8V Digital Power Supplies
It is recommended that all ground pins of this device be tied
together.
AGND_Rx
GND
B1, B2, C2, C3, D2, D7,
E1, E2, E4, F2, F4, G2, G4,
H1, H2, H3, H4
Receiver Analog Ground for 3.3V / 1.8V Analog Power Sup-
plies
It is recommended that all ground pins of this device be tied
together.
10
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