intersil EL4543 DATA SHEET

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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