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AD8153 Datasheet(PDF) 8 Page - Analog Devices

No. de Pieza. AD8153
Descripción  Single Buffered Switch 3.2 Gbps
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Fabricante  AD [Analog Devices]
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AD8153 Datasheet(HTML) 8 Page - Analog Devices

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AD8153
Preliminary Technical Data
Rev. PrA | Page 8 of 18
THEORY OF OPERATION
On the demultiplexer side, the AD8153 relays received data on
Input Port C to Output Port A and/or Output Port B, depending
on the state of the BICAST and SEL bits. On the multiplexer
side, the device relays received data on either Input Port A or
Input Port B to Output Port C, depending on the state of the
SEL bit.
When bicast mode is off, the outputs of either Port A or Port B
are in an idle state. In the idle state, the output tail current is set
to 0, and the P and N sides of the lane are pulled up to the
output termination voltage through the on-chip termination
resistors.
The device also supports loopback on all ports, illustrated in
Figure 3. Enabling loopback on any port will override
configurations set by the BICAST and SEL control bits.
Table 7 summarizes the possible device switching
configurations.
INPUT EQUALIZATION (EQ) AND OUTPUT
PRE-EMPHASIS (PE)
In backplane applications, the AD8153 needs to compensate
for signal degradation over potentially long traces. The device
supports two levels of input equalization, configured on a per-
port basis. line card.
Table 4 summarizes the high-frequency gain boost for each
control setting as well as the typical length
of backplane trace that can be compensated using each setting.
The device also has four levels of output pre-emphasis,
configured for each port. The pre-emphasis circuitry adds
a controlled amount of overshoot to the output waveform
to compensate for the high frequency loss in a backplane trace.
Tables Table 5-Table 6 summarize the high-frequency gain
boost, amount of overshoot, and the typical backplane channel
length (including two connectors) that can be compensated
using each setting. A typical backplane is made of FR4 material
with 8 mil wide trace and 8 mil spaced loosely coupled
differential traces. Each channel consists of a backplane
segment, two connectors, and two line cards. The total length of
the channel includes 3 inches of trace on each line card.
Table 4. Input Equalization Settings
EQ_x
Boost
Typical Backplane Length
0
6 dB
0 to 20 in.
1
12 dB
20 to 40+ in.
Table 5. Output Pre-Emphasis Settings (Pin Mode)
PE_x
Boost
Overshoot
Typical Backplane
Length
0
0 dB
0 %
0 to 10 in.
1
3.5 dB
35 %
20 to 30 in.
Table 6. Output Pre-Emphasis Settings (Serial Mode)
PE_x[1]
PE_x[0]
Boost
Overshoot
Typical
Backplane
Length
0
0
0 dB
0 %
0 to 10 in.
0
1
1.9 dB
15 %
10 to 20 in.
1
0
3.5 dB
35 %
20 to 30 in.
1
1
4.9 dB
60 %
30 to 40+ in.
1:2 DEMUX
2:1 MUX
Input C
Output C
Output A
Output B
Input A
Input B
Port A Loopback
Port B Loopback
Port C Loopback
1:2 DEMUX
2:1 MUX
Input C
Output C
Output A
Output B
Input A
Input B
Port A Loopback
Port B Loopback
Port C Loopback


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