DATASHEET
EL4543
FN7325
Rev 11.00
September 13, 2007
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.
Features
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.
• Pb-free available (RoHS compliant)
The EL4543 is available in both a 24 Ld QSOP package and
a 20 Ld QFN package and is specified for operation over the
-40°C to +85°C temperature range.
• VGA over twisted-pair
H
V
COMMON
MODE B
(GREEN)
COMMON
MODE C
(BLUE)
Low
High
3.0
2.0
2.5
Low
Low
2.5
3.0
2.0
High
Low
2.0
3.0
2.5
High
High
2.5
2.0
3.0
TABLE 2. INPUT LOGIC THRESHOLD (+5V SUPPLY)
VLO, max
0.8V
VHI, min
2V
• 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
Applications
• Twisted-pair drivers
• Differential line drivers
• Transmission of analog signals in a noisy environment
Ordering Information
TABLE 1. SYNC SIGNAL ENCODING
COMMON
MODE A
(RED)
• Fully differential inputs, outputs, and feedback
PART
NUMBER
PART
MARKING
PKG.
DWG. #
PACKAGE
EL4543IU
EL4543IU
24 Ld QSOP
MDP0040
EL4543IU-T7**
EL4543IU
24 Ld QSOP
MDP0040
EL4543IU-T13**
EL4543IU
24 Ld QSOP
MDP0040
EL4543IUZ
(See Note)
EL4543IUZ
24 Ld QSOP
(Pb-free)
MDP0040
EL4543IUZ-T7**
(See Note)
EL4543IUZ
24 Ld QSOP
(Pb-free)
MDP0040
EL4543IUZ-T13**
(See Note)
EL4543IUZ
24 Ld QSOP
(Pb-free)
MDP0040
EL4543IL
4543IL
20 Ld 4x4 QFN*
L20.4x4B
EL4543IL-T7**
4543IL
20 Ld 4x4 QFN*
L20.4x4B
EL4543IL-T13**
4543IL
20 Ld 4x4 QFN*
L20.4x4B
EL4543ILZ
(See Note)
4543ILZ
20 Ld 4x4 QFN*
(Pb-free)
L20.4x4B
EL4543ILZ-T7**
(See Note)
4543ILZ
20 Ld 4x4 QFN*
(Pb-free)
L20.4x4B
EL4543ILZ-T13**
(See Note)
4543ILZ
20 Ld 4x4 QFN*
(Pb-free)
L20.4x4B
*20 Ld 4x4 QFN, exposed pad 2.7 x 2.7mm is connected to VS**Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and 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-020.
FN7325 Rev 11.00
September 13, 2007
Page 1 of 18
EL4543
Pinouts
20 VS-
HSYNC 6
19 NC
18 VOUTB+
NC 7
VINB+ 8
+
-
16 NC
VINB- 9
15 VOUTC+
NC 10
VINC+ 11
VINC- 12
FN7325 Rev 11.00
September 13, 2007
17 VOUTB-
+
-
16 VOUTA-
17 VOUTA+
HSYNC 2
14 VSTHERMAL
PAD
NC 3
13 NC
VINB+ 4
12 VOUTB+
VINB- 5
11 VOUTBVOUTC+ 10
VSYNC 5
VOUTC- 9
21 VS+
15 VS+
NC 8
NC 4
VSYNC 1
VINC- 7
22 NC
VINA- 3
18 EN
23 VOUTA-
VINC+ 6
VINA+ 2
+
-
20 VINA-
24 VOUTA+
EN 1
19 VINA+
EL4543
(20 LD QFN)
TOP VIEW
EL4543
(24 LD QSOP)
TOP VIEW
14 VOUTC13 NC
Page 2 of 18
EL4543
Absolute Maximum Ratings (TA = +25°C)
Supply Voltage (VS+ & VS-). . . . . . . . . . . . . . . . . . . . . . . . . . . .+12V
Maximum Output Continuous Current . . . . . . . . . . . . . . . . . . ±70mA
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135°C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
VIN+, VINB . . . . . . . . . . . . . . . VS- + 0.8V (min) to VS+ - 0.8V (max)
VIN- - VINB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±5V
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER
VS+ = +5V, VS- = 0V, TA = +25°C, VIN = 0V, RL = 150, unless otherwise specified.
DESCRIPTION
CONDITIONS
MIN
(Note 1)
TYP
MAX
(Note 1)
UNIT
AC PERFORMANCE
BW (-3dB)
-3dB Bandwidth
VOUT = 2VP-P
350
MHz
SR
Differential Slew Rate
RL = 200
1000
V/µs
TSTL
Settling Time to 0.1%
13.6
ns
GBW
Gain Bandwidth Product
700
MHz
HD2
2nd Harmonic Distortion
f = 20MHz, RL = 200
-70
dBc
HD3
3rd Harmonic Distortion
f = 20MHz, RL = 200
-70
dBc
600
dP
Differential Phase @ 3.58MHz
0.01
°
dG
Differential Gain @ 3.58MHz
0.01
%
INPUT CHARACTERISTICS
VOS
Input Referred Offset Voltage
-10
2
10
mV
IIN
Input Bias Current (VIN+, VIN+)
-30
-15
-10
µA
ZIN
Differential Input Impedance
CIN
Input Capacitance
VDIFF
Differential Input Range
VCM
Input Common Mode Voltage Range
VN
Input Referred Voltage Noise
CMRR
Input Common Mode Rejection Ratio
EN
Threshold
Capacitance between any single input pin
and the power supplies
VS+ = +5V, VS- = 0V.
See Figure 7 for higher supply voltages.
VCM = 0 to 2V
180
k
4
pF
±0.75
V
0
60
2.3
V
27
nV/Hz
80
dB
1.4
V
60
mA
12
pF
OUTPUT CHARACTERISTICS
IOUT
Output Peak Current
COUT
Output Capacitance (Disabled)
40
Capacitance between any single output pin
and the power supplies when disabled
DC PERFORMANCE
AV
Voltage Gain
VIN = 0.8VP-P
1.82
1.96
2.05
V/V
12
V
16.2
mA
SUPPLY CHARACTERISTICS
VSUPPLY
Supply Operating Range
IS
Power Supply Current (per Channel)
PSRR
Power Supply Rejection Ratio
VS+ to VS-
5
12.3
14.5
70
80
dB
NOTE:
1. Parts are 100% tested at +25°C. Over-temperature limits established by characterization and are not production tested.
FN7325 Rev 11.00
September 13, 2007
Page 3 of 18
EL4543
Pin Descriptions
QFN
QSOP
PIN NUMBER PIN NUMBER
18
1
PIN NAME
EN
PIN DESCRIPTION
EQUIVALENT CIRCUIT
Disables video inputs and outputs
EN
VSM
CIRCUIT 1
19
2
VINA+
Non-inventing input
20
3
VINA-
Inverting input
3, 8, 13
4, 7, 10, 13,
16, 19, 22
NC
Not connected
1
5
VSYNC
Vertical sync logic input
SYNC
VSM
CIRCUIT 2
2
6
HSYNC
Horizontal sync logic input
4
8
VINB+
Non-inverting input
5
9
VINB-
Inverting input
6
11
VINC+
Non-inverting input
7
12
VINC-
Inverting input
9
14
VOUTC-
Inverting output
10
15
VOUTC+
Non-inverting output
11
17
VOUTB-
Inverting output
12
18
VOUTB+
Non-inverting output
14, Thermal
Pad
20
VS-
Negative supply
15
21
VS+
Positive supply
16
23
VOUTA-
Non-inverting output
17
24
VOUTA+
Inverting output
FN7325 Rev 11.00
September 13, 2007
Reference Circuit 2
Page 4 of 18
EL4543
Typical Performance Curves
VOLTAGE
(0.5V/DIV)
BLUE CM
OUT (CH C)
GREEN CM
OUT (CH B)
VOLTAGE
(2.5V/DIV)
RED CM
OUT (CH A)
VSYNC
BALANCE ERROR (dB)
-42
BALANCE ERROR =
20 LOG(VO,CM/VO,DIFF)
-46
-50
-54
-58
-62
100k
HSYNC
1M
TIME (0.5ms/DIV)
RL = 500
RL = 200
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
FIGURE 2. BALANCE ERROR
4
CL = 0pF
2
0
RL = 100
-2
RL = 50
-4
-6
100k
1M
100M
10M
RL = 200
8.2pF
0
2.2pF
-2
-4
-6
100k
1G
0
12pF
8.2pF
4.7pF
0
2.2pF
-2
-4
-6
100k
1M
10M
100M
1G
FREQUENCY RESPONSE (Hz)
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS CL - DIFF
FN7325 Rev 11.00
September 13, 2007
10M
100M
1G
FIGURE 4. DIFFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS CL - DIFF
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
2
1M
FREQUENCY RESPONSE (Hz)
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS RL - DIFF
RL = 100
CL = 2.2pF
22pF
12pF
2
FREQUENCY RESPONSE (Hz)
4
100M
FREQUENCY (Hz)
FIGURE 1. COMMON MODE OUTPUT
4
10M
RL = 200
20
40
60
80
100
100k
1M
10M
100M
1G
FREQUENCY RESPONSE (Hz)
FIGURE 6. CMRR
Page 5 of 18
EL4543
Typical Performance Curves
(Continued)
4.0
THRESHOLD (V)
RELATIVE TO NEGATIVE SUPPLY
12
10
CMIR (V)
8
6
4
2
0
5
6
7
8
9
10
11
3.5
3.0
2.5
VSWITCH
2.0
1.5
1.0
0.5
0
12
5
6
7
SUPPLY VOLTAGE (V)
8
9
10
11
12
SUPPLY VOLTAGE (V)
FIGURE 7. COMMON MODE INPUT RANGE vs SUPPLY
VOLTAGE
FIGURE 8. HSYNC & VSYNC THRESHOLD vs SUPPLY VOLTAGE
0
45
40
SUPPLY CURRENT (mA)
PSRR (dB)
-20
-40
-60
-80
35
30
25
20
15
10
5
-100
0
100k
10k
10M
1M
0
100M
RL = 200
0
1
2
3
4
5
6
7
8
9
10 11 12
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
FIGURE 9. PSRR vs FREQUENCY
FIGURE 10. ISUPPLY vs VSUPPLY
3.0
VOLTAGE (2V/DIV)
ENABLE DISABLE PIN (V)
3.5
2.5
2.0
1.5
1.0
2.5V
212ns
ENABLE
OUTPUT
SIGNAL
0.5
0
5
6
7
8
9
10
11
12
TIME (200ns/DIV)
SUPPLY VOLTAGE (V)
FIGURE 11. ENABLE DISABLE vs SUPPLY VOLTAGE
FN7325 Rev 11.00
September 13, 2007
FIGURE 12. ENABLE RESPONSE
Page 6 of 18
EL4543
Typical Performance Curves
(Continued)
RL = 200 DIFF
CL = 0pF
VOLTAGE (2V/DIV)
2.5V
VOLTAGE (120mV/DIV)
ENABLE
900ns
OUTPUT
SIGNAL
RISE
t = 2.5ns
FALL
t = 1.94ns
TIME (200ns/DIV)
TIME (20ns/DIV)
FIGURE 13. DISABLE RESPONSE
FIGURE 14. DIFFERENTIAL SMALL SIGNAL TRANSIENT
RESPONSE
9
RISE
t = 2.81ns
COMMON MODE DC LEVEL (V)
VOLTAGE (235mV/DIV)
RL = 200 DIFF
CL = 0pF
FALL
t = 2.31ns
LOGIC HSYNC = 0V
8 VSYNC = 0V
7
N
EE
GR
C
ED
-A R
CM
UE
C BL
C MM- B
6
5
4
3
2
1
0
TIME (20ns/DIV)
5
6
7
8
9
10
11
12
SUPPLY VOLTAGE (V)
FIGURE 15. DIFFERENTIAL LARGE SIGNAL TRANSIENT
RESPONSE
FIGURE 16. COMMON MODE DC LEVEL vs SUPPLY
VOLTAGE
9
LOGIC HSYNC = 0V
8 VSYNC = 3V
7
COMMON MODE DC LEVEL (V)
COMMON MODE DC LEVEL (V)
9
D
RE
-A
CM
L UE
-C B
CM
EEN
B GR
C M-
6
5
4
3
2
1
0
5
6
7
8
9
10
11
12
SUPPLY VOLTAGE (V)
FIGURE 17. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE
FN7325 Rev 11.00
September 13, 2007
LOGIC HSYNC = 3V
8 VSYNC = 0V
7
N
EE
GR
-B
M
C
L UE
-C B
CM
D
A RE
CM -
6
5
4
3
2
1
0
5
6
7
8
9
10
11
12
SUPPLY VOLTAGE (V)
FIGURE 18. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE
Page 7 of 18
EL4543
Typical Performance Curves
(Continued)
50
LOGIC HSYNC = 3V
8 VSYNC = 3V
OUTPUT IMPEDANCE ()
COMMON MODE DC LEVEL (V)
9
UE
BL
-C
CM
ED
-A R
CM
EEN
B GR
C M-
7
6
5
4
3
2
AV = +2
40
30
20
10
1
0
5
6
7
8
9
10
11
0
10k
12
100k
FIGURE 19. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE
0
CHAN A, B, C
RL = 200 DIFF
-20
CROSSTALK (dB)
OUTPUT IMPEDANCE ()
100M
FIGURE 20. OUTPUT IMPEDANCE
1M
10k
1k
100
-40
-60
-80
10
1
10k
100k
1M
10M
-100
100k
100M
1M
FREQUENCY (Hz)
100M
400M
FIGURE 22. CHANNEL ISOLATION vs FREQUENCY
5
NORMALIZED GAIN (dB)
10k
1k
100
10
1
10M
FREQUENCY (Hz)
FIGURE 21. OUTPUT IMPEDANCE [DISABLED]
VOLTAGE NOISE (nV/Hz),
CURRENT NOISE (pA/Hz)
10M
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
100k
1M
5
6
7
8
9
10
12
FREQUENCY (Hz)
FIGURE 23. INPUT VOLTAGE AND CURRENT NOISE
FN7325 Rev 11.00
September 13, 2007
3
1
VOP-P = 200mV
-1
VOP-P = 2V
-3
-5
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 24. FREQUENCY RESPONSE vs OUTPUT AMPLITUDE
Page 8 of 18
EL4543
Typical Performance Curves
(Continued)
FIGURE 25. GAIN vs FREQUENCY - 2 CHANNELS
FIGURE 26. GAIN vs FREQUENCY - 2 CHANNELS
FIGURE 27. GAIN vs FREQUENCY - 2 CHANNELS
FIGURE 28. PHASE vs FREQUENCY - 2 CHANNELS
FIGURE 29. PHASE vs FREQUENCY - 2 CHANNELS
FIGURE 30. PHASE vs FREQUENCY - 2 CHANNELS
FN7325 Rev 11.00
September 13, 2007
Page 9 of 18
EL4543
Typical Performance Curves
(Continued)
FIGURE 31. HARMONIC DISTORTION
FIGURE 32. HARMONIC DISTORTION
POWER DISSIPATION (W)
1.4
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD
1.136W
1.2
1
Q
JA
=
0.8
SO
88
0.6
P2
4
°C
/W
0.4
0.2
0
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 34. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 33. HARMONIC DISTORTION
0.8
0.8
JA
=
0.6
QS
11
0.4
OP
5°
C/
24
W
0.2
0
JEDEC JESD51-3 AND SEMI G42-88 (SINGLE
LAYER) TEST BOARD
0.7 667mW
1 870mW
POWER DISSIPATION (W)
POWER DISSIPATION (W)
1.2
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
(4 Q
m F
m N
=1 x 4 20
50 m
°C m)
/W
JA
0.5
0.4
0.3
0.2
0.1
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 35. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FN7325 Rev 11.00
September 13, 2007
0
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
Page 10 of 18
EL4543
Typical Performance Curves
(Continued)
POWER DISSIPATION (W)
3
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - QFN EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5
2.500W
2.5
2
(4 Q
m F
m N
2
=4 x 4 0
0° mm
C
/W )
JA
1.5
1
0.5
0
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 37. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Operational Description and Application
Information
differential output signals, decoded and transmitted along
with the RGB video signals to the video monitor.
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.
ENABLE/DISABLE
Introduction
VSYNC
HSYNC
EN
FN7325 Rev 11.00
September 13, 2007
EN
+
-
+
OUTA
-
VREF
RCM
LOGIC
DECODING
+
INB
-
EN
+
-
+
OUTB
-
VREF
GCM
BCM
+
INC
-
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 (HSYNC and
VSYNC) are passed to an internal Logic Encoding Block to
encode the sync information as three discrete signals of
different voltage levels. Generally, in differential amplifiers an
external VREF pin is used to control the common mode level
of the differential output; in the case of the EL4543 the VREF
of each of the three internal amplifier channels receives a
signal from the Logic Encoding Block with encoded HSYNC
and VSYNC information. The final output consists of three
fully differential video signals, with sync encoded on the
common mode of each of the three RGB differential signals.
HSYNC and VSYNC can easily be separated from the
+
INA
-
EN
+
-
+
OUTC
-
VREF
FIGURE 38. BLOCK DIAGRAM EL4543
Sync Transmission
The EL4543 encodes HSYNC and VSYNC signals on the
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.
Page 11 of 18
EL4543
Extract Common Mode Sync and Decode HSYNC
and VSYNC
HSYNC and VSYNC can be regenerated from the Common
Mode sync output voltages. The relationships between
HSYNC, VSYNC and the 3 common mode levels are given by
Table 1. The common mode levels are easily separated from
the differential outputs of the EL4543 using this simple
resistor network at the cable receiver input of each
differential channel; see Figure 39.
Twisted Pair Termination
The schematic in Figure 39 illustrates a termination scheme for
50 series termination and a 100 twisted pair cable. Note
RCM is the common mode termination to allow measurement
of VCM and should not be too small since it loads the EL4543; a
little over a 100 is recommended for RCM.
TYPICAL EL4543 TERMINATION DRIVER
50
+
50
TWISTED
PAIR
ZO =100
VREF
+
50
-
120
(RCM: SHOULD BE >100)
(FOR LOADING
CONSIDERATIONS)
FIGURE 39. TWISTED PAIR TERMINATION EL4543
Video Transmission
The EL4543 is a twisted pair differential line driver directed at
the transmission of Video Signals through cables up to 100
feet; however, as signal losses increase with transmission line
length the EL4543 will need additional support to equalize
video signals along longer twisted pair transmission lines. A
full solution to accomplish this is the SXGA Video
Transmission System presented in the EL4543 Data Sheet.
Note the inclusion of the EL9110 for signal equalization of up
to 1000ft of CAT5 cable and common mode extraction; see
Data Sheet for additional information on the EL9110.
Long Distance Video Transmission
The SXGA Video Transmission System makes it possible to
transmit Red, Green and Blue (RGB) video plus sync up to
1000 feet through CAT5 cable. The input to the SXGA Video
Transmission System is the output of a video source
transmitting RGB video signals plus sync. The signals are
received initially by the EL4543; which converts the single
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
CAT5 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
FN7325 Rev 11.00
September 13, 2007
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 50 series back load matching
resistor provides additional protection.
Supply Voltage
VCM
50
EL9110's common mode output pin, decodes and transmits
HSYNC and VSYNC to the output device.
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 0V to 2.3V with a 0V to 5V supply,
increasing with supply voltage (see Figure 7). The common
mode output DC level range is a linear function of the power
supply (see Figures 16, 17, 18, and 19). The common mode
input switching threshold as well as the Enable/Disable input
is a linear function of the supply voltage (see Figures 8 and
11). In the event that the EL4543 is to be used with ±5V split
rails then the input sync signals need to be voltage offset
before they are input to the EL4543. The circuit configuration
depicted in Figure 40 provides for the proper level shift.
KST2907A
Horizontal Sync in
EL4543
HSYN Pin
4.30k
2.70k
-5V
KST2907A
Vertical Sync in
4.30k
EL4543
VSYN Pin
2.70k
-5V
FIGURE 40. LEVEL SHIFTING SYNC SIGNALS FOR USE
WITH ±5V SPLIT RAILS
Page 12 of 18
EL4543
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:
V O
PD = 3 V S I SMAX + V S ------------
R LD
Having obtained the application's power dissipation, the
maximum junction temperature can be calculated:
T JMAX = T MAX + JA PD
(EQ. 2)
where:
• TJMAX is the maximum junction temperature (125°C)
• TMAX is the maximum ambient operating temperature
• PD is the power dissipation calculated above
• JA is the thermal resistance, junction to ambient, of the
application (package + PCB combination). Refer to the
Package Power Dissipation curves.
• Note:
For the QFN package, the thermal pad is internally
connected to VS- and may only be grounded in applications
where a single supply is used and VS- is returned to ground.
In applications where VS- is tied to a negative voltage the
thermal pad must also be connected to the same negative
voltage.
See Technical Bulletin 389
(http://www.intersil.com/data/tb/TB389.pdf) for additional QFN
PCB layout information.
Application Circuit
Video Transmission Along CAT5 Cable
VGA input RGB plus sync is connected with 75 termination to
the inputs of the EL4543. Single-ended RGB video is
converted to differential mode signals with HSYNC and VSYNC
encoded on the common-mode of the three differential signals,
respectively. The 50 output-terminated EL4543 drives the
differential RGB with sync encoded common-mode to CAT5
twisted pair cables. Note this system, without signal frequency
equalization, will satisfactorily transmit along up to 200ft of
CAT5 twisted-pair. For longer cable lengths, frequency and
gain equalization to compensate for signal degradation is
recommended (EL9110) and a delay line technology (EL9115)
to adjust for phase mismatch between signals at the receiving
end.
(EQ. 1)
where:
• VS is the total power supply to the EL4543 (from VS+ to VS-)
• ISMAX = Maximum quiescent supply current per channel
• VO = Maximum differential output voltage of the application
• RLD = Differential load resistance
• ILOAD = Load current
FN7325 Rev 11.00
September 13, 2007
Page 13 of 18
1
RED
EN
2
EL4543 QSOP
24
OUTA+
INA+
OUTA-
INA-
N.C.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
GREEN
4
5
RVSYNC 1K
6
N.C.
VS+
VSYNC
VS-
EL4543IU
3
HSYNC
RHSYNC 1K
7
N.C.
8
22
9
OUTBN.C.
10
11
N.C.
OUTC+
INC+
OUTC-
BLUE
18
INC-
N.C.
1
2
3
4
5
6
7
8
2
C34
0.1uf
7
_
+VS
R31 75
+VS
0.1uf
C35
3
RJOUTB+
49.9
6
_
4
16
15
RED
GREEN
C35a
200pF
EL8201IS
BLUE
U3
R30
2K
R29
2K
RJOUTB49.9
RJOUTC+
49.9
HSYNC
VSYNC
Blue Out Differential
14
13
5
VS-
Green Out Differential
17
RJC+ 75
12
8
VS+
19
OUTB+
INB-
75
1
RJOUTA49.9
21
N.C.
INB+
R32
Red Out Differential
20
RJB+ 75
INPUT
CAT2
RJOUTA+
49.9
23
RJA+ 75
8
7
6
5
4
3
2
1
CAT1
EL4543
FN7325 Rev 11.00
September 13, 2007
EL4543 and EL9110 Sync Extraction
RJOUTC49.9
OUTPUT
UJ1
-VS
+VS
DIODE D9
DIODE D10
DIODE D11
DIODE D12
-VS
+VS
+VS
-VS
DIODE D1
DIODE D2
DIODE D3
DIODE D4
-VS
-VS
+VS
DIODE D5
DIODE D6
NL
R4
VGAN
C5
1uf
NL
R18
NL
C14
-VS
C17
0.1uf
+VS
49.9
C24
C18
1uf
51 C33
1uf
R33
NL
R29
NL
C25
VGAN
Ctrl-ref
Vctrl
Vinp
Vinm
Vsm
Cmout
Vgain
Logic-ref
EL9110 RED A
R27
330
C27
0.1uf
C26
1uf
C19
0.1uf
-VS
INDUCTOR 5
5
C28
1uf
R28
C29
0.1uf
+VS
+VS
+VS
+VS
+VS
NL = Not Loaded
R33
3.6K
R34
3.6K
GND
BANANA JACK
R36
1K Pot
BANANA JACK
R35
3.6K
R37
VadjBlue
1K Pot
VGAN
R38
1K Pot
VCRTL
-VS
+ C36
+ C38
4.7uf
R39
3.6K
0.1uF
C39
R40
1K Pot
0.1uF
-VS
BANANA JACK
+VS
C37
4.7uf
1uf
5
16
15
14
13
12
11
10
9
Cmext
Vsp
Enbl
Vspo
Vout
Vsmo
0V
X2
C8
0.1uf
Inductor =Ferrite 68 Ohms
C30
75 R25
1
2
3
4
5
6
7
8
VadjRed
0.1uf
C31
0.1uf
C32
INDUCTOR 6
51
R32
0.1uf
R28
49.9
-VS
5
R23
RED
NL
R27
1K
R26
5
R25
R32
Rred4
3000
R31
INDUCTOR3
C16
1uf
5
R12
NL
C23
R26
49.9
EL9110 GREEN B
R20
330
VGAN
R31
330
EL9110
51
R22
16
15
14
13
12
11
10
9
Cmext
Vsp
Enbl
Vspo
Vout
Vsmo
0V
X2
C22
0.1uf
Ctrl-ref
Vctrl
Vinp
Vinm
Vsm
Cmout
Vgain
Logic-ref
0.1uf
C13
R17
49.9
GREEN
1
2
3
4
5
6
7
8
Red In Differential
INDUCTOR 4
75 R24
330
INDUCTOR 2
51
R21
EL9110
C11
49.9
+VS
INDUCTOR 1
C7
1uf
NL
R16
R30 1K
EL9110 BLUE C
R9
330
C6
0.1uf
NL
C3
NL
C12
R15
49.9
VadjRed
VCRTL
1uf
R29
0.1uf
51
R11
16
15
14
13
12
11
10
9
Cmext
Vsp
Enbl
Vspo
Vout
Vsmo
0V
X2
C10
C4
0.1uf
1uf
C2
Ctrl-ref
Vctrl
Vinp
Vinm
Vsm
Cmout
Vgain
Logic-ref
0.1uf
R6 1K
1
2
3
4
5
6
7
8
EL9110
51
R10
R5
R3
49.9
5
R14
BLUE
NL
R2
C20
VCRTL
Green InDifferential
1uf
75
R13
NL
C1
R1
49.9
DIODE D8
R19
R8
C9
Blue In Differential
49.9
-VS
DIODE D7
3000
R7
330
+VS
C21
0.1uf
VadjBlu
1uf
VCRTL
C15
+VS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
+VS
Page 14 of 18
EL4543
EL4543/EL5375/EL8201 CAT5 RGB + Sync
Video Transmission System
Introducing a low cost turn-key system for transmitting
component video over short to moderate CAT5 cable lengths
(1 to 500 feet) with selectable cable loss and skew
compensation. Using only 3 of the 4 pairs in standard CAT5 the
4th pair is available for audio, function control or data
transmission; an additional benefit.
RGB video plus sync (5 channels) is received at the VGA
terminal and presented single ended to the EL4543. The
EL4543 converts single ended RGB into fully differential
signals on three twisted pairs. Sync is encoded on the three
RGB differential signals as differential common mode and then
drives the differential signals with encoded sync through CAT5
cable. The common mode of the signals is extracted from the
differential signals with a passive network of resistors and
passed to the EL8201 for sync decoding. The differential signal
is passed directly to the EL5375 where it is amplified,
converted back into single ended format. Signal attenuation
occurs in all transmission lines as a function of increasing
cable length; this application system utilizes individual channel
2-pole compensation for cable lengths of 150, 300 and 500
feet. Additionally, the compensation network can be
manipulated to provide some measure of cable prop delay
skew compensation for slight differences in cable lengths
between CAT5 pairs. Cable skew can best be done around the
300ft range by under compensating the shortest color pair
(color on the left side of a vertical line) and over compensate
the longest color pair (color on the right side of a vertical line).
Around 450ft only the shortest color pair can be under
compensated.
The board for the driver and receiver should use strip lines or
strip line waveguides for the inputs and outputs of the drivers
and receivers. The 75 input and output strip lines waveguide
on 0.06 inch epoxy board with ground back plain should be
0.016 inch wide with 0.01 inch space to ground area around
them. The differential pair strip line waveguides should be two
0.045 inch 50 lines spaced 0.01 inch apart and spaced 0.01
inch to ground area around them. This is a general guide and
size values may very for many reasons.
The receiver feedback and gain resistor network which goes
directly to the minus input should be connected very close with
minimal trace length and minimal capacitance to ground. The
ground plane on the backside of the board, in back of these
resistors and the minus input pin should be removed as well.
FN7325 Rev 11.00
September 13, 2007
Page 15 of 18
EL4543
Output +5V
R34
Open
R35
1
U2
REF1
NC
INP1
FB1
INN1
OUT1
24
R40
2K
0
2
3
R36
Open
499
499
R28
2K
R28
2K
R24
R13
57
R25
Output +5V
R12
57
R37
4
5
NC
NC
REF2
VSP
23
R41
2K
22
6
R14
49.9
Output +5V
R38
Open
499
R30
2K
2K
R26
R21
1K
499
R31
7
C2
0.1uF
R39
8
9
11
R15
57
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
24
OUTA-
INA-
N.C.
R16
57
N.C.
VS+
5
R2 1K
6
VSYNC
VS-
HSYNC
N.C.
7
N.C.
OUTB+
9
10
Blue In
11
R5
C3
0.1uF
C1
0.1uf
20
18
INB+
OUTB-
INB-
N.C.
N.C.
OUTC+
INC+
OUTC-
INC-
N.C.
EN
INN3
FB3
NC
OUT3
Input +5V
16
R9
49.9
15
R10
49.9
R19
55
JP+
JUMPER
Csup2
4.7uF
13
2
R11
49.9
C4
0.1uF
R23
1K
C4a
220pF
Ground
JUMPER
JPJUMPER
2
1
Output -5V
JB5
-VS Out
+
+ Csup3
4.7uF
Csup4
4.7uF
JB6
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
GND
OUTPUT
INPUT
2
1
2
1
Output +5V
JB4
Compensation Control Switch
On
Off
1
12
2
11
3
10
4
9
5
8
6
7
R50
1K
150 Feet Comp
R57
300 Feet Comp
10K
C12
10p
C11
36p
R58
68K
R59
C13
68p
3.9K
C14
22p
R60
33K
SW DIP-6
13
VS+
8
7
_
3
4
GND
+VS Out
R56
33K
R51
1K
R46
2K
R52
500
300 Feet Comp
R61 3.9K
C15 C16
68p 22p
150 Feet Comp
R63
R62
33K
C17
36p
10K
C18
10p
R64
68K
R63
75
R65
75
75
R67 75
14
Input -5V
+
Csup1
4.7uF
R49
500
14
C19
0.1uF
1
R20
49.9
JB2
+
JB3
C10
22p
R66 75
R18
55
Blue Out Differential
-VS In
3.9K
R64
6
_
5
VS-
EL8201IS
JB1
R44
2K
15
R22
1K
EL4543IU
+VS In
16
R8
49.9
17
75
12
12
INP3
R55
C9
68p
19
R4 75
INPUT
C21
~4pF
C22
~4pF
Green Out Differential
8
OUT2
300 Feet Comp
R54
68K
R43
2K
18Output -5V
R17
49.9
R7
49.9
21
R3 1K
Green In
REF3
10K
17
R45
2K
Input +5V
4
FB2
19
EL5375
23
22
NC
NC
150 Feet Comp
C7 C8
36p 10p
C6
0.1uF
R6
49.9
Red Out Differential
INA+
INN2
R48
1K
R53
499
2
OUTA+
499
R33
R1
75
EL4543 QSOP
EN
R32
1
VSN
R47
500
C5
0.1uF
20
0
10
Red In
INP2
C20
~4pF
21
Output +5V
0
R27
FN7325 Rev 11.00
September 13, 2007
EL4543/EL5375/EL8201 CAT5 RGB + Sync Video Transmission System
U3
Output +5V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
OUTPUT
Page 16 of 18
EL4543
Package Outline Drawing
L20.4x4B
20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 1, 11/06
4X
4.00
2.0
16X 0.50
A
B
16
6
PIN #1 INDEX AREA
20
6
PIN 1
INDEX AREA
1
4.00
15
2 .70 REF
11
(4X)
5
0.15
6
10
0.10 M C A B
4
20X 0.25 ± 0.02
20X 0.4 ± 0.05
TOP VIEW
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
0 . 90 ± 0 . 1
C
BASE PLANE
( 3. 8 TYP )
(
2. 70 )
SEATING PLANE
0.08 C
( 20X 0 . 5 )
SIDE VIEW
( 20X 0 . 25 )
C
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
( 20X 0 . 6)
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3. Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
FN7325 Rev 11.00
September 13, 2007
Page 17 of 18
EL4543
Quarter Size Outline Plastic Packages Family (QSOP)
MDP0040
A
QUARTER SIZE OUTLINE PLASTIC PACKAGES FAMILY
D
(N/2)+1
N
INCHES
SYMBOL QSOP16 QSOP24 QSOP28 TOLERANCE NOTES
E
PIN #1
I.D. MARK
E1
1
(N/2)
B
0.010
C A B
e
H
C
SEATING
PLANE
0.007
0.004 C
b
C A B
A
0.068
0.068
0.068
Max.
-
A1
0.006
0.006
0.006
±0.002
-
A2
0.056
0.056
0.056
±0.004
-
b
0.010
0.010
0.010
±0.002
-
c
0.008
0.008
0.008
±0.001
-
D
0.193
0.341
0.390
±0.004
1, 3
E
0.236
0.236
0.236
±0.008
-
E1
0.154
0.154
0.154
±0.004
2, 3
e
0.025
0.025
0.025
Basic
-
L
0.025
0.025
0.025
±0.009
-
L1
0.041
0.041
0.041
Basic
-
N
16
24
28
Reference
Rev. F 2/07
NOTES:
L1
A
1. Plastic or metal protrusions of 0.006” maximum per side are not
included.
2. Plastic interlead protrusions of 0.010” maximum per side are not
included.
c
SEE DETAIL "X"
3. Dimensions “D” and “E1” are measured at Datum Plane “H”.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
0.010
A2
GAUGE
PLANE
L
A1
4°±4°
DETAIL X
© Copyright Intersil Americas LLC 2004-2007. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN7325 Rev 11.00
September 13, 2007
Page 18 of 18
工商网监
湘ICP备2023018690号
