ISL54105CRZ Intersil, ISL54105CRZ Datasheet - Page 10

• Manufacturer Part Number: ISL54105CRZ
• Description: IC TMDS REGENERATOR 72-QFN
• Manufacturer: Intersil

Specifications of ISL54105CRZ

• Applications: Multimedia Displays, Test Equipment
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 72-VFQFN Exposed Pad
• Mounting Type: Surface Mount
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Next, a 15m DualLink DVI cable was attached and
terminated into a female TPA2 adapter and the eye captured
in Figure 4.
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 ISL54105 and an additional 15m cable
between the pattern generator and the monitor:
Given the input signal shown in Figure 4, the ISL54105’s
TMDS output signal (Figure 6) is extremely clean. The
output is an improvement over the original signal coming
from the pattern generator in both amplitude and jitter.
VIDEO PATTERN
FIGURE 4. CHROMA EYE DIAGRAM AFTER 15m CABLE
CHROMA 2326
GENERATOR
ISL54105
15m DUAL-LINK
DVI CABLE
FIGURE 5. TEST SETUP B
FIGURE 3
FIGURE 4
FIGURE 6
15m DUAL-LINK
DVI CABLE
10
FIGURE 7
UXGA MONITOR
DELL 2000FP
ISL54105
The cleaner signal generated at the output of the ISL54105
results in an improved eye at the end of another 15m cable
(Figure 7). The eye is open enough that the Dell 2000FP can
now display a UXGA image with no visible sparkle or other
artifacts.
Tx Loading Considerations
When the ISL54105 is powered-up and its Tx outputs are
disabled, via either the PD (power-down) pin, the
power-down register bit (register 0x02[5]), or the tri-state
outputs bits (register 0x05[1:0]), the Tx pins are high
impedance. In this state, they will draw no current from the
Rx pins of any TMDS receiver they may be connected to.
However, if power to the ISL54105 is removed, the Tx pins
are no longer high-impedance. Figure 8 shows the relevant
equivalent circuit, including the internal ESD protection
diodes. For simplicity, only one of the eight Tx outputs, ESD
protection diodes, and Rx termination resistors are shown.
When V
applied to the external TMDS receiver, ESD protection
diodes inside the ISL54105 can become forward-biased,
FIGURE 7. ISL54105 EYE DIAGRAM AFTER 15m CABLE
FIGURE 6. EYE DIAGRAM AT OUTPUT OF ISL54105
D
to the ISL54105 drops below ~2.7V and power is
June 11, 2008
FN6723.0