TAN-042
Designing the XRT71D00 and the XRT73L00 Devices to
operate in the Host Mode, and to be accessed via a single Chip
Select pin.
Preliminary
July 19, 2001
Revision 1.03
24
1. To provide some isolation and filtering between the Digital VDD and the Analog
VDD lines.
2. To provide some isolation (and reduce cross-talk) between the Transmit and
Receive Analog VDD lines.
3. To provide some isolation (and reduce cross-talk) between each of the
components of the line card.
NOTE:
In contrast to the LC filter (consisting of Inductor L1 and capacitor C5), these
LC filters must not be shared with other LIU or Jitter Attenuator Devices.
COMPONENT SELECTION FOR L2, L3 AND C3, C4
As mentioned above, each of the LC filters (consisting of Inductors L2 and L3 and
capacitors C3 and C4) are used to filter and isolate the power supply line, going to the
LIU Receive Analog VDD/Jitter Attenuator Analog VDD pins and the LIU Transmit
Analog VDD pins. Each of these inductors should be of the value 6.8uH, and each of
these capacitors should be of value 2.2uF.
The current consumption (via each of the Power Supply pins, of the XRT73L00 device)
is presented below in Table 4.
Table 4, The Current Consumption via each of the XRT73L00 Power Supply Pins
Pin Number
Description
Amount of Current
3
Transmit Analog VDD
4.7mA
10
Receive Analog VDD
59.3mA
26 EXCLK_VDD
1.45mA
29
Receive Digital VDD
16.9mA
42
Transmit Analog VDD
49.9mA
Total Current Consumption – Channel 0
132.25mA
NOTE:
Current consumption measurements were made while the XRT73L00 device
was operating in the “STS-1” Mode, and transmitting/receiving an “All Ones” pattern.
Similarly, the current consumption (via each of the Power Supply pins, of the XRT71D00
device) is presented below in Table 5.
