1
FN7325.5
EL4543
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 Ld QSOP package and is
specified for operation over the -40C to +85C temperature
range.
Features
Fully differential inputs, outputs, and feedback
350MHz -3dB bandwidth
1200V/s 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
TABLE 1. SYNC SIGNAL ENCODING
H
V
COMMON
MODE A
(RED)
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)
V
LO
, max
0.8V
V
HI
, min
2V
Ordering Information
PART
NUMBER
PART
MARKING
TAPE &
REEL
PACKAGE
PKG.
DWG. #
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
-
24 Ld QSOP
(Pb-Free)
MDP0040
EL4543IUZ-T7
(See Note)
EL4543IUZ
7"
24 Ld QSOP
(Pb-Free)
MDP0040
EL4543IUZ-T13
(See Note)
EL4543IUZ
13"
24 Ld QSOP
(Pb-Free)
MDP0040
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)
4543ILZ
-
20 Ld 4x4 QFN*
(Pb-Free)
MDP0046
EL4543ILZ-T7
(See Note)
4543ILZ
7"
20 Ld 4x4 QFN*
(Pb-Free)
MDP0046
EL4543ILZ-T13
(See Note)
4543ILZ
13"
20 Ld 4x4 QFN*
(Pb-Free)
MDP0046
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
Data Sheet
October 26, 2005
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
.
3
FN7325.5
October 26, 2005
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
J
= T
C
= T
A
Absolute Maximum Ratings
(T
A
= 25C)
Supply Voltage (V
S
+
& V
S
-
). . . . . . . . . . . . . . . . . . . . . . . . . . . .+12V
Maximum Output Continuous Current . . . . . . . . . . . . . . . . . . 70mA
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40C to +85C
V
IN
+, V
INB
. . . . . . . . . . . . . . . V
S
-
+ 0.8V (min) to V
S
+
- 0.8V (max)
V
IN
- - V
INB
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V
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.
Electrical Specifications
V
S
+ = +5V, V
S
- = 0V, T
A
= 25C, V
IN
= 0V, R
L
= 150
, unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
AC PERFORMANCE
BW (-3dB)
-3dB Bandwidth
V
OUT
= 2V
P-P
350
MHz
SR
Differential Slew Rate
R
L
= 200
600
1000
V/s
T
STL
Settling Time to 0.1%
13.6
ns
GBW
Gain Bandwidth Product
700
MHz
HD2
2nd Harmonic Distortion
f = 20MHz, R
L
= 200
-70
dBc
HD3
3rd Harmonic Distortion
f = 20MHz, R
L
= 200
-70
dBc
dP
Differential Phase @ 3.58MHz
0.01
dG
Differential Gain @ 3.58MHz
0.01
%
INPUT CHARACTERISTICS
V
OS
Input Referred Offset Voltage
-10
2
10
mV
I
IN
Input Bias Current (V
IN
+, V
IN
+)
-30
-15
-10
A
Z
IN
Differential Input Impedance
180
k
V
DIFF
Differential Input Range
0.75
V
V
CM
Input Common Mode Voltage Range
0
2.3
V
V
N
Input Referred Voltage Noise
27
nV/
Hz
CMRR
Input Common Mode Rejection Ratio
V
CM
= 0 to 2V
60
80
dB
EN
Threshold
1.4
V
OUTPUT CHARACTERISTICS
I
OUT
Output Peak Current
40
60
mA
DC PERFORMANCE
A
V
Voltage Gain
V
IN
= 0.8V
P-P
1.82
1.96
2.05
V/V
SUPPLY CHARACTERISTICS
V
SUPPLY
Supply Operating Range
V
S
+ to V
S
-
5
12
V
I
S
Power Supply Current (per Channel)
12.3
14.5
16.2
mA
PSRR
Power Supply Rejection Ratio
70
80
dB
EL4543
5
FN7325.5
October 26, 2005
Typical Performance Curves
FIGURE 1. COMMON MODE OUTPUT
FIGURE 2. BALANCE ERROR
FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS R
L
- DIFF
FIGURE 4. DIFFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS C
L
- DIFF
FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE FOR
VARIOUS C
L
- DIFF
FIGURE 6. CMRR
TIME (0.5ms/DIV)
BLUE CM
OUT (CH A
GREEN CM
OUT (CH B
RED CM
OUT (CH C
V
SYNC
H
SYNC
VO
LTA
GE
(0.
5
V/
DIV
)
VO
LTAG
E
(2.
5
V/
DIV
)
BALANCE ERROR=
20 LOG(
VO
,CM/
VO
,DIFF)
-42
-46
-50
-54
-58
-62
100K
1M
10M
100M
FREQUENCY (Hz)
BALANC
E
E
R
R
O
R (
d
B)
C
L
=0pF
4
2
0
-2
-4
-6
100K
1M
10M
FREQUENCY RESPONSE (Hz)
NORMA
L
IZED GAIN (dB)
100M
1G
R
L
=500
R
L
=50
R
L
=200
R
L
=100
R
L
=200
22pF
2.2pF
12pF
8.2pF
4
2
0
-2
-4
-6
100K
1M
10M
FREQUENCY RESPONSE (Hz)
NORMA
L
IZED GAIN (dB)
100M
1G
R
L
=100
C
L
=2.2pF
4
2
0
-2
-4
-6
100K
1M
10M
FREQUENCY RESPONSE (Hz)
N
O
RMAL
IZED GAIN
(dB)
100M
1G
2.2pF
12pF
8.2pF
4.7pF
R
L
=200
0
20
40
60
80
100
100K
1M
10M
FREQUENCY RESPONSE (Hz)
N
O
RMAL
IZED GAIN
(dB)
100M
1G
EL4543
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