lel as close to the device as possible, with the smaller

Differential Traces

Trace characteristics affect the performance of the

MAX9152. Use controlled-impedance traces. Eliminate

reflections and ensure that noise couples as common

mode by running the differential trace pairs close

together. Reduce skew by matching the electrical

length of the traces. Excessive skew can result in a

degradation of magnetic field cancellation.

Maintain the distance between the differential traces to

avoid discontinuities in differential impedance. Avoid

90

° turns and minimize the number of vias to further

prevent impedance discontinuities.

Cables and Connectors

Transmission media should have nominal differential

impedance of 75

Ω or 100Ω. Use cables and connec-

tors that have matched differential impedance to mini-

mize impedance discontinuities.

Avoid the use of unbalanced cables such as ribbon or

simple coaxial cable. Balanced cables such as twisted

pair offer superior signal quality and tend to generate

less EMI due to canceling effects. Balanced cables

tend to pick up noise as common mode, which is

rejected by the differential receiver.

Board Layout

For LVDS applications, a four-layer printed-circuit (PC)

board that provides separate power, ground, and sig-

nal planes is recommended.

800Mbps LVDS/LVPECL-to-LVDS 2 x 2

Crosspoint Switch

_______________________________________________________________________________________

9

20%

20%

50%

50%

80%

80%

Figure 6. Output Transition Time and Propagation Delay Timing

Diagram

(1:2 SPLITTER MODE)

Figure 7. Output Channel-to-Channel Skew

OUT0

OUT0 OR OUT1

OUT1

2 x 2 CROSSPOINT

2:1 MUX

1:2 DEMUX

1:2 SPLITTER

DUAL REPEATER

OUT0

OUT1

OUT0

OUT1

OUT0

OUT1

IN0

IN1

IN0

IN1

IN0

IN1

IN0 OR IN1

IN0 OR IN1

Figure 8. Programmable Configurations