ISL35411

6

FN6971.1

March 25, 2010

Operation

The ISL35411 is an advanced driver for high-speed

interconnects. A functional diagram of ISL35411 is

shown in Figure 4. In addition to a de-emphasis circuit

to compensate for channel loss and improve signal

fidelity, the ISL35411 contains unique integrated features

to preserve special signaling protocols typically broken by

other drivers. The signal detect function is used to mute

the channel output when the equalized signal falls below

the level determined by the Detection Threshold (DT) pin

voltage. This function is intended to preserve periods of

line silence

As illustrated in Figure 4, the core of the high-speed

signal path in the ISL35411 is a sophisticated driver

followed by a de-emphasis circuit. The device applies

pre-distortion to compensate for skin effect loss,

dielectric loss, and impedance discontinuities in the

transmission channel.

Typical Performance Characteristics

Performance is measured using the test setup illustrated in Figure 1. The signal from the pattern generator is launched

into the chip evaluation board. The ISL35411 output signal is then visualized on a scope to determine signal integrity

parameters such as jitter.

FIGURE 1. DEVICE CHARACTERIZATION TEST SETUP

2A. DE-EMPHASIS 0

2B. DE-EMPHASIS 6

FIGURE 2. ISL35411 10.3125Gbps OUTPUT; NO CHANNEL; PRBS-31

FIGURE 3. ISL35411 10.3125 GBPS OUTPUT AFTER A 22-INCH FR-408 TRACE, PRBS-31; DE-EMPHASIS 6

P a tte r n

G ene r a to r

IS L 3 5 411 E v al

Bo a r d

O s c illo s c o p e