Datasheet EL4543 Datasheet (intersil)

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EL4543

Data Sheet October 26, 2005

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.

FN7325.5

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 plus anneal available (RoHS compliant)

Applications

• Twisted-pair drivers

• Differential line drivers

• VGA over twisted-pair

• Transmission of analog signals in a noisy environment

The EL4543 is available in a 24 Ld QSOP package and is
specified for operation over the -40°C to +85°C temperature
range.

TABLE 1. SYNC SIGNAL ENCODING

COMMON

MODE A

HV

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)

V

, max 0.8V

LO

V

, min 2V

HI

(RED)

COMMON

MODE B

(GREEN)

COMMON

MODE C

(BLUE)

Ordering Information

PART

NUMBER

EL4543IU EL4543IU - 24 Ld QSOP MDP0040

EL4543IU-T7 EL4543IU 7” 24 Ld QSOP MDP0040

EL4543IU-T13 EL4543IU 13” 24 Ld QSOP MDP0040

EL4543IUZ
(See Note)

EL4543IUZ-T7
(See Note)

EL4543IUZ-T13
(See Note)

EL4543IL 4543IL - 20 Ld 4x4 QFN* MDP0046

EL4543IL-T7 4543IL 7” 20 Ld 4x4 QFN* MDP0046

EL4543IL-T13 4543IL 13” 20 Ld 4x4 QFN* MDP0046

EL4543ILZ
(See Note)

EL4543ILZ-T7
(See Note)

EL4543ILZ-T13
(See Note)

NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are 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.

*20 Ld 4x4 QFN, exposed pad 2.7 x 2.7mm

PAR T

MARKING

EL4543IUZ - 24 Ld QSOP

EL4543IUZ 7” 24 Ld QSOP

EL4543IUZ 13” 24 Ld QSOP

4543ILZ - 20 Ld 4x4 QFN*

4543ILZ 7” 20 Ld 4x4 QFN*

4543ILZ 13” 20 Ld 4x4 QFN*

TAPE &

REEL PACKAGE

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

PKG.

DWG. #

MDP0040

MDP0040

MDP0040

MDP0046

MDP0046

MDP0046

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright © Intersil Americas Inc. 2004, 2005. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

Pinouts

EL4543

(24 LD QSOP)

TOP VIEW

EL4543

EL4543

(20 LD QFN)

TOP VIEW

EN

VINA+

VINA-

NC

VSYNC

HSYNC

NC

VINB+

VINB-

NC

VINC+

VINC-

1

+

2

-

3

4

5

6

7

+

8

-

9

10

+

11

-

12

24

23

22

21

20

19

18

17

16

15

14

13

VOUTA+

VOUTA-

NC

VS+

VS-

NC

VOUTB+

VOUTB-

NC

VOUTC+

VOUTC-

NC

VSYNC

HSYNC

NC

VINB+

VINB-

PAD

EN

18

8

NC

VOUTA+

17

16 VOUTA-

9

10VOUTC+

VOUTC-

15

VS+

VS-

14

NC

13

VOUTB+

12

11 VOUTB-

VINA-

VINA+

20

19

1

2

6

VINC+

THERMAL

7

VINC-

3

4

5

2

FN7325.5

October 26, 2005

EL4543

Absolute Maximum Ratings (T

Supply Voltage (V

Maximum Output Continuous Current . . . . . . . . . . . . . . . . . . ±70mA

Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C

+ & VS-). . . . . . . . . . . . . . . . . . . . . . . . . . . .+12V

S

= 25°C)

A

Ambient Operating Temperature . . . . . . . . . . . . . . . . -40°C to +85°C

V

+, V

IN

V

IN

. . . . . . . . . . . . . . . V

INB

- - V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5V

INB

- + 0.8V (min) to VS+ - 0.8V (max)

S

Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135°C

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

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: T

Electrical Specifications V

+ = +5V, VS- = 0V, TA = 25°C, VIN = 0V, RL = 150Ω, unless otherwise specified.

S

= TC = T

J

A

PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT

AC PERFORMANCE

BW (-3dB) -3dB Bandwidth V

OUT

= 2V

P-P

350 MHz

SR Differential Slew Rate RL = 200Ω 600 1000 V/µs

T

STL

Settling Time to 0.1% 13.6 ns

GBW Gain Bandwidth Product 700 MHz

HD2 2nd Harmonic Distortion f = 20MHz, R

HD3 3rd Harmonic Distortion f = 20MHz, R

= 200Ω -70 dBc

L

= 200Ω -70 dBc

L

dP Differential Phase @ 3.58MHz 0.01 °

dG Differential Gain @ 3.58MHz 0.01 %

INPUT CHARACTERISTICS

V

OS

I

IN

Z

IN

V

DIFF

V

CM

V

N

CMRR Input Common Mode Rejection Ratio V

EN

Input Referred Offset Voltage -10 2 10 mV

Input Bias Current (VIN+, VIN+) -30 -15 -10 µA

Differential Input Impedance 180 kΩ

Differential Input Range ±0.75 V

Input Common Mode Voltage Range 0 2.3 V

Input Referred Voltage Noise 27 nV/√Hz

= 0 to 2V 60 80 dB

CM

Threshold 1.4 V

OUTPUT CHARACTERISTICS

I

OUT

Output Peak Current 40 60 mA

DC PERFORMANCE

A

V

Voltage Gain VIN = 0.8V

P-P

1.82 1.96 2.05 V/V

SUPPLY CHARACTERISTICS

V

SUPPLY

I

S

Supply Operating Range VS+ to VS-512V

Power Supply Current (per Channel) 12.3 14.5 16.2 mA

PSRR Power Supply Rejection Ratio 70 80 dB

3

FN7325.5

October 26, 2005

EL4543

Pin Descriptions

PIN NUMBER PIN NAME PIN DESCRIPTION EQUIVALENT CIRCUIT

1EN

2 VINA+ Non-inventing input

3 VINA- Inverting input

4, 7, 10, 13, 16, 19, 22 NC Not connected

5 VSYNC Vertical sync logic input

6 HSYNC Horizontal sync logic input Reference Circuit 2

8 VINB+ Non-inverting input

9 VINB- Inverting input

11 VINC+ Non-inverting input

12 VINC- Inverting input

14 VOUTC- Inverting output

15 VOUTC+ Non-inverting output

17 VOUTB- Inverting output

18 VOUTB+ Non-inverting output

20 VS- Negative supply

21 VS+ Positive supply

23 VOUTA- Non-inverting output

24 VOUTA+ Inverting output

Disables video inputs and outputs

V

SM

CIRCUIT 1

V

SM

CIRCUIT 2

EN

SYNC

4

FN7325.5

October 26, 2005

Typical Performance Curves

A

M

B

C

(0.5V/DIV)

VOLTAGE

(2.5V/DIV)

VOLTAGE

TIME (0.5ms/DIV)

FIGURE 1. COMMON MODE OUTPUT FIGURE 2. BALANCE ERROR

BLUE CM
OUT (CH

GREEN C
OUT (CH

RED CM
OUT (CH

V

SYNC

H

SYNC

EL4543

-42
BALANCE ERROR=

20 LOG(∆

-46

-50

-54

BALANCE ERROR (dB)

-58

-62

100K 1M 10M 100M

,CM/∆VO,DIFF)

VO

FREQUENCY (Hz)

4

CL=0pF

2

0

-2

-4

NORMALIZED GAIN (dB)

-6
100K 1M 10M

FREQUENCY RESPONSE (Hz)

RL=500Ω

RL=200Ω

RL=100Ω

RL=50Ω

100M 1G

FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE FOR

VARIOUS R

4

RL=100Ω

=2.2pF

C

L

2

0

-2

- DIFF

L

8.2pF

12pF

4.7pF

2.2pF

4

RL=200Ω

2

0

-2

-4

NORMALIZED GAIN (dB)

-6
100K 1M 10M

FREQUENCY RESPONSE (Hz)

12pF

8.2pF

22pF

2.2pF

100M 1G

FIGURE 4. DIFFFERENTIAL FREQUENCY RESPONSE FOR

VARIOUS CL - DIFF

0

RL=200Ω

20

40

60

-4

NORMALIZED GAIN (dB)

-6
100K 1M 10M

FREQUENCY RESPONSE (Hz)

FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE FOR

VARIOUS C

- DIFF

L

100M 1G

5

80

NORMALIZED GAIN (dB)

100

100K 1M 10M

FREQUENCY RESPONSE (Hz)

FIGURE 6. CMRR

100M 1G

October 26, 2005

FN7325.5

Typical Performance Curves (Continued)

T

EL4543

12

10

8

6

CMIR (V)

4

2

0

56 8

7911

SUPPLY VOLAGE (V)

10 12

FIGURE 7. COMMON MODE INPUT RANGE vs SUPPLY

VO LTAGE

0

-20

-40

-60

PSRR (dB)

-80

-100
0 10K 1M

FREQUENCY

10M 100M100K

FIGURE 9. PSRR vs FREQUENCY FIGURE 10. I

THRESHOLD (V)

RELATIVE TO NEGATIVE SUPPLY

FIGURE 8. H

0.04

0.035

0.03

0.025

0.02

0.015

CURRENT (A)

0.01

0.005

4

3.5

3

2.5

2

1.5

1

0.5

0

56 8

SUPPLY VOLAGE (V)

& V

SYNC

0

56 8

THRESHOLD vs SUPPLY VOLTAGE

SYNC

SUPPLY VOLAGE (V)

SUPPLY

V

SWITCH

10 127911

RL=200Ω

10 127911

vs V

SUPPLY

3.5

3

2.5

2

1.5

1

ENABLE DISABLE PIN (V)

0.5

0

56 8

2.5V

VOLTAGE (2V/DIV)

10 127911

SUPPLY VOLAGE (V)

212ns

TIME (200ns/DIV)

FIGURE 11. ENABLE DISABLE vs SUPPLY VOLTAGE FIGURE 12. ENABLE RESPONSE

6

ENABLE

OUTPU
SIGNAL

FN7325.5

October 26, 2005

Typical Performance Curves (Continued)

T

2.5V

900ns

ENABLE

EL4543

RL=200Ω DIFF
C

=0pF

L

VOLTAGE (2V/DIV)

TIME (200ns/DIV)

OUTPU
SIGNAL

FIGURE 13. DISABLE RESPONSE FIGURE 14. DIFFERENTIAL SMALL SIGNAL TRANSIENT

RL=200Ω DIFF

=0pF

C

L

RISE

∆t=2.81ns

VOLTAGE (235mV/DIV)

TIME (20ns/DIV)

FALL

∆t=2.31ns

FIGURE 15. DIFFERENTIAL LARGE SIGNAL TRANSIENT

RESPONSE

RISE

∆t=25ns

VOLTAGE (120mV/DIV)

TIME (20ns/DIV)

FALL

∆t=1.94ns

RESPONSE

9

LOGIC H

8

V

SYNC

7

6

5

4

3

2

1

COMMON MODE DC LEVEL (V)

0

56 8

=0V

SYNC

=0V

SUPPLY VOLAGE (V)

N

E

E

R

G

B

-

M

C

D

E

R

A

-

M

C

UE

BL

C

-

CM

10 127911

FIGURE 16. COMMON MODE DC LEVEL vs SUPPLY

VOLTAGE

9

LOGIC H
V

SYNC

=3V

SYNC

8

7

6

5

4

3

2

1

COMMON MODE DC LEVEL (V)

0

56 8

=0V

SUPPLY VOLAGE (V)

D

E

R

A

-

M

C

C

M

C

10 127911

E

U

L

B

C

-

M

N

E

E

R

G

B

-

9

LOGIC H
V

SYNC

=0V

SYNC

8

7

6

5

4

3

2

1

COMMON MODE DC LEVEL (V)

0

56 8

=3V

C

SUPPLY VOLAGE (V)

N

E

E

R

G

B

-

M

C

10 127911

E

LU

B

C

-

M

D

E

R

A

-

M

C

FIGURE 17. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE FIGURE 18. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE

7

FN7325.5

October 26, 2005

Typical Performance Curves (Continued)

EL4543

9

LOGIC H
V

SYNC

=3V

SYNC

8

7

6

5

4

3

2

1

COMMON MODE DC LEVEL (V)

0

56 8

=3V

SUPPLY VOLAGE (V)

E

U

L

B

C

-

M

C

C

10 127911

D

E

R

A

-

M

C

M

N

E

E

R

G

B

-

50

AV=+2

40

30

20

10

OUTPUT IMPEDANCE (Ω)

0

10K 100K 10M

FREQUENCY (Hz)

FIGURE 19. COMMON MODE DC LEVEL vs SUPPLY VOLTAGE FIGURE 20. OUTPUT IMPEDANCE

VOLTAGE NOISE (nV/√Hz),

10K

1K

100

10

CURRENT NOISE (pA/√Hz)

0

RL=200Ω DIFF

-20

-40

-60

CROSSTALK (dB)

-80

100M1M

1

56 8

FREQUENCY (Hz)

10 1279

-100
100K 1M 100M

10M

FREQUENCY (Hz)

FIGURE 21. INPUT VOLTAGE AND CURRENT NOISE FIGURE 22. CHANNEL ISOLATION vs FREQUENCY

5

3

1

-1

-3

NORMALIZED GAIN (dB)

-5
100K 1M 100M

10M

FREQUENCY (Hz)

FIGURE 23. FREQUENCY RESPONSE vs OUTPUT

V

OP-P

V

OP-P

=2V

=200mV

1G

FIGURE 24. GAIN vs FREQUENCY - 2 CHANNELS

AMPLITUDE

400M

8

FN7325.5

October 26, 2005

EL4543

Typical Performance Curves (Continued)

FIGURE 25. GAIN vs FREQUENCY - 2 CHANNELS FIGURE 26. GAIN vs FREQUENCY - 2 CHANNELS

FIGURE 27. PHASE vs FREQUENCY - 2 CHANNELS FIGURE 28. PHASE vs FREQUENCY - 2 CHANNELS

FIGURE 29. PHASE vs FREQUENCY - 2 CHANNELS FIGURE 30. HARMONIC DISTORTION

9

FN7325.5

October 26, 2005

Typical Performance Curves (Continued)

FIGURE 31. HARMONIC DISTORTION FIGURE 32. HARMONIC DISTORTION

EL4543

JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD

1.4

1.136W

1.2

1

0.8

0.6

0.4

0.2

POWER DISSIPATION (W)

0

0 255075100 150

Q

S

θ

O

J

A

P

=

2

8

4

8

°

C

/W

12585

AMBIENT TEMPERATURE (°C)

FIGURE 33. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD - QFN EXPOSED
DIEPAD SOLDERED TO PCB PER JESD51-5

3

2.500W

2.5

(

4

Q

2

1.5

1

POWER DISSIPATION (W)

0.5

0

025 7510012585 15050

m

F

m

N

θ

2

JA

x

0

=

4

4

m

0

°

m

C

)

/

W

AMBIENT TEMPERATURE (°C)

FIGURE 35. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

JEDEC JESD51-3 LOW EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD

1.2

1

870mW

0.8

0.6

0.4

0.2

POWER DISSIPATION (W)

0

0 255075100 150

Q

S

θ

O

J

A

P

=

2

1

4

1

5

°

C

/

W

12585

AMBIENT TEMPERATURE (°C)

FIGURE 34. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

JEDEC JESD51-3 AND SEMI G42-88 (SINGLE
LAYER) TEST BOARD

0.8

667mW

0.7

0.6

0.5

0.4

0.3

0.2

POWER DISSIPATION (W)

0.1

0

025 7510012585 15050

(

4

Q

m

F

θ

m

N

J

2

A

x

0

=

4

1

m

5

0

m

°

C

)

/

W

AMBIENT TEMPERATURE (°C)

FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

10

FN7325.5

October 26, 2005

EL4543

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 CAT-5 cable, the 4th available twisted pair can be
used for transmission of audio, data or control information.
The distribution of composite video over standard CAT-5
cable enables enormous cost and labor savings compared
with traditional coaxial cable, when considering both the
relative low price and ease of pulling CAT-5 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

) are passed to an internal Logic Encoding Block to

SYNC

encode the sync information as three discrete signals of
different voltage levels. Generally, in differential amplifiers an
external V

pin is used to control the common mode level

REF

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

information. The final output consists of three

SYNC

fully differential video signals, with sync encoded on the
common mode of each of the three RGB differential signals.
H

SYNC

and V

can easily be separated from the

SYNC

differential output signals, decoded and transmitted along
with the RGB video signals to the video monitor.

EN

+

+

INA OUTA

-

­V

REF

V

H

SYNC

SYNC

EN

ENABLE/DISABLE

LOGIC

DECODING

FIGURE 37. BLOCK DIAGRAM EL4543

RCM

GCM

BCM

EN

+

+

INB OUTB

-

­V

REF

EN

+

+

INC OUTC

-

­V

REF

SYNC

+

-

+

-

+

-

and

REF

SYNC

Sync Transmission

The EL4543 encodes H
common mode output of the differential video signals; Red,
Green and Blue respectively. Data Sheet Figure 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 CAT 5
cable.

Extract Common Mode Sync and Decode H
V

SYNC

H

and V

SYNC

Mode sync output voltages. The relationships between
H

, V

SYNC

SYNC

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 38.

can be regenerated from the Common

SYNC

and the 3 common mode levels are given by

SYNC

and V

signals on the

SYNC

SYNC

&

Twisted Pair Termination

The schematic in Figure 38 illustrates a termination scheme
for 50Ω series termination and a 100Ω twisted pair cable.
Note RCM is the common mode termination to allow
measurement of V

and should not be too small since it

CM

loads the EL4543; a little over a 100Ω is recommended for
RCM.

TYPICAL EL4543 TERMINATION DRIVER

TWISTED

V

50Ω

+

-

50Ω

REF

FIGURE 38. TWISTED PAIR TERMINATION EL4543

Z

PAI R

=100Ω

O

50Ω

50Ω

+

V

CM

120Ω

-

(RCM: SHOULD BE >100Ω)
(FOR LOADING
CONSIDERATIONS)

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 CAT-5 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 CAT-5 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

11

FN7325.5

October 26, 2005

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
H

SYNC

and V

to the output device.

SYNC

Sync Transmission

The EL4543 encodes H
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.

SYNC

and V

signals onto the

SYNC

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 0V 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 T
(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 VSIS×()

× C

Σ

1

INTVS

2

f××()CLV

2
OUT

f××()+=

where:

•V

is the total power supply to the EL4543 (from VS+ to VS-)

S

•V

•C

•C

•I

is the swing on the output (VH - VL)

OUT

is the load capacitance

L

is the internal load capacitance (80pF max)

INT

is the quiescent supply current (40mA max)

S

• f is frequency

Having obtained the application's power dissipation, the
maximum junction temperature can be calculated:

T

JMAXTMAXΘJA

PD×+=

JMAX

12

FN7325.5

October 26, 2005

T

EL4543

where:

•T

•T

is the maximum junction temperature (125°C)

JMAX

is the maximum ambient operating temperature

MAX

• 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.

Application Circuit

Video Transmission Along CAT-5 Cable

VGA input RGB plus sync is connected with 75Ω termination
to the inputs of the EL4543. Single-ended RGB video is

EL4543 & EL9110 Sync Extraction

8

RJOUTA+

OUTA+

OUTA-

OUTB+

OUTB-

OUTC+

49.9

24

23

RJOUTA-

49.9

22

N.C.

21

VS+

20

VS-

19

N.C.

RJOUTB+

49.9

18

17

RJOUTB-

49.9

16

N.C.

RJOUTC+

49.9

15

14

OUTC-

RJOUTC-

49.9

13

N.C.

INPUT

EL4543 QSOP

1

RED

1

GREEN

2
3
4
5
6
7
8

9
10
11
12
13
14
15

BLUE

RJA+ 75

RVSYNC 1K

RHSYNC

RJB+ 75

RJC+ 75

EN

2

INA+

3

INA-

4

N.C.

5

VSYNC

6

HSYNC

1K

7

N.C.

EL4543IU

8

INB+

9

INB-

10

N.C.

11

INC+

12

INC-

UJ1

NL
C1

R6 1K

C2 0.1uf

NL
C3

+VS

D2DIODE

-VS

D4DIODE

VCRTL

NL
R2

NL

R4

+VS

VadjBlu

R7

R8

330

3000

C6

1
2
3
4
5
6
7

0.1uf

Ctrl-ref
Vctrl
Vinp
Vinm
Vsm
Cmout
Vgain
Logic-ref8X2

EL9110 BLUE C

INDUCTOR 1

C7

R12

1uf

5

VadjBlue

EL9110

BLUE

Cmext

Vsp
Enbl

Vspo

Vout

Vsmo

0V

-VS

0.1uf

51
R10

51

C4

R11

1uf

R9
330

C5

1uf

R33

3.6K

R36

1K Pot

-VS

+VS

C9

1uf

75

R13

5

R14

16
15
14
13
12
11

C11

C10

0.1uf

10
9

C8

0.1uf

1K Pot

-VS

D1DIODE

+VS

D3

DIODE

Blue In Differential

R1

49.9

R5

49.9

R3

49.9

NL = Not Loaded

Inductor =Ferrite 68 Ohms

CAT1

Red Out Differential

+VS

0.1uf

C35

Green Out Diff erential

Blue Out Differential

D5

DIODE

DIODE

D7

Green InDifferential Red In Differential

INDUCTOR 2

+VS

R34

3.6K

R37 R38

D6DIODE

DIODE

NL
C12

R15

49.9
R30 1K

R29

49.9

C13 0.1uf

R17

49.9

NL
C14

+VS+VS

VGAN

converted to differential mode signals with H
V

encoded on the common-mode of the three

SYNC

SYNC

and

differential signals, respectively. The 50Ω output-terminated
EL4543 drives the differential RGB with sync encoded
common-mode to CAT-5 twisted pair cables. Note this
system, without signal frequency equalization, will
satisfactorily transmit along up to 200 feet of CAT-5 twisted­pair. 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.

1234567

1234567

+VS

-VS

D8

VCRTL

NL
R16

NL

R18

VGANVGAN

R35

3.6K

1K Pot

8

CAT2

R32 75

1

2

_

3

4

VS-

EL8201IS

-VS

DIODE

D9

+VS

D11DIODE

C20

1uf

330

R19

51

1

Ctrl-ref

R21

2

Vctrl

3

Vinp

4

Vinm

5

51

Vsm

6

R22

1uf

C17

0.1uf

7

EL9110 GREEN B

C18
1uf

VCRTL

Cmout
Vgain
Logic-ref8X2

R23

C15

R20
330

C16

1uf

R24

75

GREEN

16

Cmext

15

Vsp

14

Enbl

13

Vspo

12

EL9110

Vout

11

Vsmo

10

0V

9

5

C19

0.1uf

C21

0.1uf

GND

BANANA JACK

R25

C22

+VS

BANANA JACK

-VS

BANANA JACK

5

R26

49.9

INDUCTOR 4

+VS

0.1uf
R28

49.9

+

C36

4.7uf

+

C38

4.7uf

D10

DIODE

D12DIODE

NL
C23

R32 1K

R31

49.9

C24

0.1uf

NL
C25

VGAN

+VS

C37

0.1uF

C39

0.1uF

-VS

C34

0.1uf

8

VS+

+VS

R31 75

7

6

_

5

C35a

200pF

U3

+VS

-VS

VCRTL

R31
330

NL

51

R27

R32

51

C33

1uf

R33

NL

R29

R27

330

C27

0.1uf
C26
1uf

+VS

R30

R29

2K

2K

VadjRed

Rred4
3000

1

Ctrl-ref

Cmext

2

Vctrl

3

Vinp

4

Vinm

Vspo

5

Vsm

Vout

6

EL9110

Cmout

Vsmo

7

Vgain
Logic-ref8X2

EL9110 RED A

INDUCTOR 5INDUCTOR3

5

C28

R28

1uf

R39

3.6K

R40

1K Pot

RED

R25

C30

75

RED

16
15

Vsp

14

Enbl

13
12

0.1uf

11

C31

10

0V

9

-VS-VS

C29

0.1uf

VadjRed

GREEN

HSYNC

1
2

BLUE

3
4
5
6
7
8
9
10
11
12
13

VSYNC

14
15

OUTPU

1uf

5

INDUCTOR 6

R26

+VS

0.1uf
C32

13

FN7325.5

October 26, 2005

R1
75

R2

1K

R4

75

R5

75

R6

49.9

R7

49.9

Input +5V

EN

1

INA+

2

INA-

3

N.C.

4

HSYNC

6

N.C.

7

VSYNC

5

INB+

8

INB-

9

N.C.

10

INC+

11

INC-

12

N.C.

13

OUTC-

14

OUTC+

15

N.C.

16

OUTB-

17

OUTB+

18

N.C.

19

VS-

20

VS+

21

N.C.

22

OUTA-

23

OUTA+

24

EL4543 QSOP

EL4543IU

R8

49.9

R9

49.9

R10

49.9

R11

49.9

C1

0.1uf

R3 1K

Red In

Green In

Blue In

Red Out Differential

Green Out Differential

Blue Out Differential

1234567

8

OUTPUT

REF1

1

INP1

2

INN1

3

NC

4

REF2

5

INP2

6

INN2

7

NC

8

REF3

9

INP3

10

INN3

11

NC12OUT3

13

FB3

14

EN

15

OUT2

16

FB2

17

NC

18

VSN

19

VSP

20

NC

21

OUT1

22

FB1

23

NC

24

U2

EL5375

R28

499

R28

499

R31

499

R30

499

R32

499

R33

499

R25

2K

R27

2K

R24

2K

R26

2K

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

OUTPUT

1234567

8

INPUT

R12
57

R13
57

R14

49.9

R16
57

R17

49.9

R1855R19

55

R20

49.9

C6

0.1uF

Output +5V

Output -5V

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

INPUT

R36
Open

R37

0

Output +5V

R41
2K

R40
2K

R54

68K

R47

500

R53 10K

R48
1K

C7
36p

C8
10p

R56
33K

R55 3.9K

C9
68p

C10

22p

150 Feet Comp

300 Feet Comp

R44
2K

R43

2K

R46

2K

R45

2K

R63

75

R65 75

R64

75

R66 75

R67 75

R64
68K

R51

1K

R63 10K

R52
500

C17
36p

C18
10p

R62
33K

R61

3.9K

C15
68p

C16
22p

150 Feet Comp

300 Feet Comp

JB1

+VS In

JB3

GND

JB2

-VS In

Input -5VInput +5V

JB4

+VS Out

JB6

GND

JB5

-VS Out

Output -5VOutput +5V

1

2

JP+

JUMPER

1

2

JP-

JUMPER

+

Csup1

4.7uF

+

Csup2

4.7uF

+

Csup3

4.7uF

+

Csup4

4.7uF

R15
57

R58
68K

R49
500

R57 10K

R50
1K

C11
36p

C12
10p

R60
33K

R59 3.9K

C13
68p

C14
22p

150 Feet Comp 300 Feet Comp

R34
Open

R35

0

Output +5V

R38
Open

R39

0

Output +5V

1
2
3
4
5
6

12
11
10
9
8
7

Compensation Control Switch

SW DIP-6

1

2

3

VS-

4

5

6

7

VS+

8

_

_

U3

EL8201IS

Output +5V

C19

0.1uF

C3

0.1uF

C2

0.1uF

C4

0.1uF

C5

0.1uF

1

2

Ground

JUMPER

R22
1K

R21

1K

R23

1K

On Off

C20
~4pF

C21

~4pF

C22

~4pF

C4a
220pF

EL4543

EL4543/EL5375/EL8201 CAT-5 RGB +
Sync Video Transmission System

Introducing a low cost turn-key system for transmitting
component video over short to moderate CAT-5 cable
lengths (1 to 500 feet) with selectable cable loss and skew
compensation. Using only 3 of the 4 pairs in standard CAT-5

th

the 4

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 CAT-5 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 CAT-5 pairs. Cable
skew can best be done around the 300 ft 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 450 ft 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 75Ω 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 diff pair strip line waveguides should
be two 0.045 inch 50Ω 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.

14

FN7325.5

October 26, 2005

QSOP Package Outline Drawing

EL4543

15

FN7325.5

October 26, 2005

QFN Package Outline Drawing

EL4543

NOTE: The package drawings shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at
http://www.intersil.com/design/packages/index.asp

All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.

Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality

Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets 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

16

FN7325.5

October 26, 2005