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PDF EL4543 Data sheet ( Hoja de datos )
| Número de pieza | EL4543 | |
| Descripción | Triple Differential Twisted-Pair Driver with Common-Mode Sync Encoding | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
July 8, 2004
EL4543
FN7325.2
Triple Differential Twisted-Pair Driver with
Common-Mode Sync Encoding
The EL4543 is a high bandwidth
triple differential amplifier with
integrated encoding of video sync
signals. The inputs are suitable for handling high speed
video or other communications signals in either single-ended
or differential form, and the common-mode input range
extends all the way to the negative rail enabling ground-
referenced signalling in single supply applications. The high
bandwidth enables differential signalling onto standard
twisted-pair or coax with very low harmonic distortion, while
internal feedback ensures balanced gain and phase at the
outputs reducing radiated EMI and harmonics.
Embedded logic encodes standard video horizontal and
vertical sync signals onto the common mode of the twisted
pair(s), transmitting this additional information without the
requirement for additional buffers or transmission lines. The
EL4543 enables significant system cost savings when
compared with discrete line driver alternatives.
The EL4543 is available in a 24-pin QSOP package and is
specified for operation over the -40°C to +85°C temperature
range.
Ordering Information
PART
NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL4543IU
EL4543IU-T7
24-Pin QSOP
24-Pin QSOP
-
7”
MDP0040
MDP0040
EL4543IU-T13
EL4543IUZ
(Note 1)
24-Pin QSOP
24-Pin QSOP
(Pb-Free)
13”
-
MDP0040
MDP0040
EL4543IUZ-T7
(Note 1)
EL4543IUZ-T13
(Note 1)
EL4543IL
(Note 2)
24-Pin QSOP
(Pb-Free)
24-Pin QSOP
(Pb-Free)
20-Pin QFN
7”
13”
-
MDP0040
MDP0040
MDP0046
NOTES:
1. Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
2. Coming soon
Features
• Fully differential inputs, outputs, and feedback
• 350MHz -3dB bandwidth
• 1200V/µs slew rate
• -75dB distortion at 5MHz
• Single 5V to 12V operation
• 50mA minimum output current
• Low power - 36mA total typical supply current
• Pb-free available
Applications
• Twisted-pair driver
• Differential line driver
• VGA over twisted-pair
• Transmission of analog signals in a noisy environment
H
Low
Low
High
High
TABLE 1. SYNC SIGNAL ENCODING
COMMON COMMON COMMON
MODE A MODE B MODE C
V (RED) (GREEN) (BLUE)
High
3.0
2.0
2.5
Low 2.5 3.0 2.0
Low 2.0 3.0 2.5
High
2.5
2.0
3.0
TABLE 2. INPUT LOGIC THRESHOLD (+5V SUPPLY)
VLO, max
VHI, min
0.8V
2V
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002-2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
1 page  
Typical Performance Curves (Continued)
EL4543
4
3 CL=0pF
2
1
0
-1
-2
-3
-4
-5
-6
100K
1M
RL=500Ω
RL=200Ω
RL=100Ω
RL=50Ω
10M
100M
FREQUENCY RESPONSE (Hz)
1G
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS RL - DIFF
4
3 RL=200Ω
2
1
0
-1
-2
-3
-4
-5
-6
100K
1M
12pF
8.2pF
22pF
2.2pF
10M
100M
FREQUENCY RESPONSE (Hz)
1G
FIGURE 4. DIFFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS CL - DIFF
4
3
RL=100Ω
CL=2.2pF
2
1
0
-1
-2
-3
-4
-5
-6
100K
1M
81.22ppFF
4.7pF
12pF
2.2pF
10M
100M
1G
FREQUENCY RESPONSE (Hz)
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS CL - DIFF
0
10 RL=200Ω
20
30
40
50
60
70
80
90
100
100K
1M
10M
100M
FREQUENCY RESPONSE (Hz)
FIGURE 6. CMRR
1G
12
10
8
6
4
2
0
5 6 7 8 9 10 11 12
SUPPLY VOLAGE (V)
FIGURE 7. COMMON MODE INPUT RANGE vs SUPPLY
VOLTAGE
5
4
3.5
3
2.5
2 VSWITCH
1.5
1
0.5
0
5 6 7 8 9 10 11 12
VSUPPLY (V)
FIGURE 8. HSYNC & VSYNC THRESHOLD vs SUPPLY VOLTAGE
5 Page 
EL4543
ended input RGB signals to three fully differential waveforms
with sync encoded on the discrete common modes of each
color channel and then drives the signals through a length of
CAT-5 cable. The signal is received by the EL9110, which
can provide 6-pole equalization for both high and low
frequency signal transmission line losses. Then the EL9110
converts the differential RGB video signals back into single
ended format while extracting the common mode component
for decoding. The single ended RGB signal is taken directly
from the output of the El9110 and is ready for the output
device. The Common Mode Decoder Circuit receives the
common mode signals directly from each of the three
EL9110's common mode output pin, decodes and transmits
HSYNC and VSYNC to the output device.
Sync Transmission
The EL4543 encodes HSYNC and VSYNC signals onto the
common mode output of the differential video signals; Red,
Green and Blue respectively. Data Sheet Figure 8 clearly
illustrates that the sum of the common mode voltages results
in a fixed DC level with no AC content; thus eliminating EMI
interference.
Output Drive Protection
The EL4543 has internal short circuit protection set typically
at 60mA. if the output is shorted for extended periods of time
the increased power dissipation will eventually destroy the
part. To realize maximum reliability the output current should
never exceed 60mA. The 50Ω series back load matching
resistor provides additional protection.
Supply Voltage
While the EL4543 can be operated on ±5V split rails, single
supply 0V to 5V is the most common usage. It is very
important to note that the input logic thresholds are relative
to the negative supply pin, and therefore single supply,
ground referenced logic will not work when driving the
EL4543 on split rails. The amplifiers have an input common
mode range from 1.5V to 3.5V with a 0V to 5V supply. The
common mode output DC level range is a linear function of
the power supply, see Data Sheet Figures 15, 16, 17 &18.
The common mode input switching threshold as well as the
Enable/Disable input is a linear function of the supply
voltage, see Data Sheet Figure 1.
Disable and Power Down
The EL4543 provides an enable disable function which
powers down, logic input high, in 900ns and powers up, logic
input low, in 212ns. Disabled the amplifiers supply current is
reduced to 1.8mA (Positive Supply) and 0mA (Negative
Supply). Note that Enable/Disable threshold is a linear
function of the supply voltage levels. The Enable/Disable
threshold voltage level is compatible with standard
TTL/CMOS and referenced to the lowest supply potential.
Proper Layout Technique
A critical concern with any PCB layout is the establishment
of a “healthy” ground plane. It is imperative to provide
ground planes terminated close to inputs to minimize input
capacitance. Additionally, the ground plane can be
selectively removed from inputs to prevent load and supply
currents from flowing near the input nodes.
In general the following guidelines apply to all PCB layout:
• Keep all traces as short as possible.
• Keep power supply bypass components as close to the
chip as possible - extremely close.
• Create a healthy ground with low impedance and
continuous ground pathways available to all grounded
components board-wide.
• In high frequency applications on multi-level boards try to
keep one level of board with continuous ground plane and
minimum via cutouts - providing it is affordable.
• Provide extremely short loops from power pin to ground.
• If it is affordable, a ferrite bead is always of benefit to
isolate device from Power Supply noise and the rest of the
circuit from the noise of the device.
Power Dissipation Calculation
When switching at high speeds, or driving heavy loads, the
EL4543 drive capability is ultimately limited by the rise in die
temperature brought about by internal power dissipation. For
reliable operation die temperature must be kept below TJMAX
(125°C). It is necessary to calculate the power dissipation for
a given application prior to selecting package type. Power
dissipation may be calculated:
4
PD = (VS × IS) × Σ(CINT × VS2 × f) + (CL × VO2 UT × f)
1
where:
• VS is the total power supply to the EL4543 (from VS+ to VS-)
• VOUT is the swing on the output (VH - VL)
• CL is the load capacitance
• CINT is the internal load capacitance (80pF max)
• IS is the quiescent supply current (40mA max)
• f is frequency
Having obtained the application's power dissipation, the
maximum junction temperature can be calculated:
TJMAX = TMAX + ΘJA × PD
where:
• TJMAX is the maximum junction temperature (125°C)
• TMAX is the maximum ambient operating temperature
• PD is the power dissipation calculated above
• θJA is the thermal resistance, junction to ambient, of the
application (package + PCB combination). Refer to the
Package Power Dissipation curves.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EL4543.PDF ] | |
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