EL4543ILZ Intersil, EL4543ILZ Datasheet - Page 11

• Manufacturer Part Number: EL4543ILZ
• Description: IC DRIVER TWISTED 350MHZ 20QFN
• Manufacturer: Intersil

Specifications of EL4543ILZ

• Applications: Driver
• Output Type: Differential
• Number Of Circuits: 3
• -3db Bandwidth: 350MHz
• Slew Rate: 1000 V/µs
• Current - Supply: 14.5mA
• Current - Output / Channel: 60mA
• Voltage - Supply, Single/dual (±): 5 V ~ 12 V, ±2.5 V ~ 6 V
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Performance Curves
Operational Description and Application
Information
Introduction
The EL4543 is designed to differentially drive composite
RGB video signals onto twisted pair lines, while
simultaneously encoding horizontal and vertical sync signals
as common mode output. The entire video signal plus sync
can therefore be transmitted on 3 twisted pairs of wire. When
utilizing CAT5 cable, the 4th available twisted pair can be
used for transmission of audio, data or control information.
The distribution of composite video over standard CAT5
cable enables enormous cost and labor savings compared
with traditional coaxial cable, when considering both the
relative low price and ease of pulling CAT5 cable.
Functional Description
The EL4543 provides three fully differential high-speed
amplifiers, suitable for driving high-resolution composite
video signals onto twisted pair or standard coaxial cable.
The input common-mode range extends to the negative rail,
allowing simple ground-referenced input termination to be
used with a single supply. The amplifiers provide a fixed gain
of +2 to compensate for standard video cable termination
schemes. Horizontal and Vertical sync signals (H
V
encode the sync information as three discrete signals of
different voltage levels. Generally, in differential amplifiers an
external V
of the differential output; in the case of the EL4543 the V
of each of the three internal amplifier channels receives a
signal from the Logic Encoding Block with encoded H
and V
fully differential video signals, with sync encoded on the
common mode of each of the three RGB differential signals.
H
SYNC
SYNC
SYNC
) are passed to an internal Logic Encoding Block to
and V
REF
information. The final output consists of three
SYNC
pin is used to control the common mode level
can easily be separated from the
11
FIGURE 37. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
(Continued)
2.5
1.5
0.5
3
2
1
0
0
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - QFN EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5
2.500W
SYNC
25
SYNC
AMBIENT TEMPERATURE (°C)
and
REF
EL4543
50
75
85
differential output signals, decoded and transmitted along
with the RGB video signals to the video monitor.
Sync Transmission
The EL4543 encodes H
common mode output of the differential video signals; Red,
Green and Blue respectively. Data Sheet Figures 16, 17 and
18 clearly illustrate that the sum of the common mode
voltages results in a fixed average DC level with no AC
content and illustrates the logic levels. This eliminates EMI
radiation into any common mode signal along the twisted
pairs of CAT5 cable.
H
V
100
SYNC
SYNC
EN
125
FIGURE 38. BLOCK DIAGRAM EL4543
DECODING
150
LOGIC
SYNC
RCM
GCM
BCM
and V
SYNC
INA
INB
INC
+
+
+
-
-
-
signals on the
+
+
+
-
-
-
EN
V
EN
V
EN
V
REF
REF
REF
September 13, 2007
OUTA
OUTB
OUTC
+
+
+
-
-
-
FN7325.11