ISL54100_14 Datasheet, PDF (15/21 Pages) Intersil Corporation – TMDS Regenerators with Multiplexers

ISL54100, ISL54101, ISL54102
Typical Performance
Setup A (Figure 4) was used to capture the TMDS eye
diagrams shown in Figure 5 and Figure 6:
CHROMA 2326
VIDEO PATTERN
GENERATOR @
UXGA 60Hz
15m DUAL-LINK
DVI CABLE
DELL 2000FP
UXGA MONITOR
FIGURE 5
FIGURE 6
FIGURE 4. TEST SETUP A
The 162.5Mpixel/s (UXGA 60Hz) DVI output of the Chroma
2326 was terminated into a TPA2 Plug adapter and
measured with a LeCroy differential probe and 6MHz SDA
using the LeCroy’s software clock recovery. As Figure 5
shows, the amplitude of the TMDS signal is slightly low, but
the eye is otherwise acceptable.
The eye is not meeting the minimum requirements of either
the HDMI or DVI standards and the Dell Monitor is unable to
recover the data and display an image.
Setup B inserts an ISL54100 and an additional 15m cable
between the pattern generator and the monitor:
CHROMA 2326
VIDEO PATTERN
GENERATOR
FIGURE 5
15m DUAL-LINK
DVI CABLE
FIGURE 6
FIGURE 9
ISL54100
15m DUAL-LINK
DVI CABLE
DELL 2000FP
UXGA MONITOR
FIGURE 8
FIGURE 7. TEST SETUP B
Given the input signal shown in Figure 6, the ISL54100’s
TMDS output signal (Figure 8) is extremely clean. The
output is an improvement over the original signal coming
from the pattern generator in both amplitude and jitter.
FIGURE 5. EYE DIAGRAM AT OUTPUT OF CHROMA
GENERATOR
Next, a 15m DualLink DVI cable was attached and
terminated into a female TPA2 adapter and the eye captured
in Figure 6.
FIGURE 8. EYE DIAGRAM AT OUTPUT OF ISL54100
The cleaner signal generated at the output of the ISL54100
results in an improved eye at the end of another 15m cable
(Figure 9). The eye is open enough that the Dell 2000FP can
now display a UXGA image with no visible sparkle or other
artifacts.
FIGURE 6. CHROMA EYE DIAGRAM AFTER 15m CABLE
15
FN6275.5
June 4, 2008