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EL5178 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL5178
Beschreibung (EL5178 / EL5378) 700MHz Differential Twisted-Pair Drivers
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 18 Seiten
EL5178 Datasheet, Funktion
DATASHEET
700MHz Differential Twisted-Pair Drivers
EL5178, EL5378
The EL5178 and EL5378 are single and triple high bandwidth
amplifiers with an output in differential form. They are
primarily targeted for applications such as driving twisted-pair
lines in component video applications. The inputs can be in
either single-ended or differential form but the outputs are
always in differential form.
On the EL5178 and EL5378, two feedback inputs provide the
user with the ability to set the gain of each device (stable at
minimum gain of 2).
The output common mode level for each channel is set by the
associated REF pin, which has a -3dB bandwidth of over
110MHz. Generally, these pins are grounded but can be tied to
any voltage reference.
All outputs are short circuit protected to withstand temporary
overload condition.
The EL5178 is available in 8 Ld MSOP and SOIC packages and
EL5378 is available in a 28 Ld QSOP package. All are specified
for operation over the full -40°C to +85°C temperature range.
Features
• Fully differential inputs, outputs, and feedback
• Differential input range ±2.3V
• 700MHz 3dB bandwidth
• 1000V/µs slew rate
• Low distortion at 5MHz and 20MHz
• Single 5V or dual ±5V supplies
• 60mA maximum output current
• Low power - 12.5mA per channel
• Pb-free available (RoHS compliant)
Applications
• Twisted-pair driver
• Differential line driver
• VGA over twisted-pair
• ADSL/HDSL driver
• Single-ended to differential amplification
• Transmission of analog signals in a noisy environment
Pinouts
EL5178
(8 LD MSOP, SOIC)
TOP VIEW
FBP 1
IN+ 2
REF 3
FBN 4
+
-
8 OUT+
7 VS-
6 VS+
5 OUT-
EL5378
(28 LD QSOP)
TOP VIEW
NC 1
INP1 2
INN1 3
REF1 4
NC 5
INP2 6
INN2 7
REF2 8
NC 9
INP3 10
INN3 11
REF3 12
NC 13
EN 14
+
-
+
-
+
-
28 OUT1
27 FBP1
26 FBN1
25 OUT1B
24 VSP
23 VSN
22 OUT2
21 FBP2
20 FBN2
19 OUT2B
18 OUT3
17 FBP3
16 FBN3
15 OUT3B
August 19, 2015
FN7491.6
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2004, 2005, 2007, 2010, 2012, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.






EL5178 Datasheet, Funktion
EL5178, EL5378
Typical Performance Curves (Continued)
20
VS = ±5V
15 RLD = 1k
CLD = 0pF
10 RF = 422
5
0
-5
-10
AV = 2
AV = 5
-15
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 7. EL5378 FREQUENCY RESPONSE FOR VARIOUS GAIN
VS = ±5V
RF = 422
RLD = 200
AV = 2
CLD = 12pF
CLD = 5.6pF
CLD = 0pF
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 8. EL5378 FREQUENCY RESPONSE FOR VARIOUS CLD
VS = ±5V
CLD = 0pF
RF = 422
AV = 2
RLD = 1k
RLD = 200
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 9. EL5378 FREQUENCY RESPONSE FOR VARIOUS RLD
VS = ±5V
100k
1M
10M
100M
FREQUENCY (Hz)
FIGURE 11. CMRR vs FREQUENCY
1G
EN
IN
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
FIGURE 10. VOLTAGE AND CURRENT NOISE vs FREQUENCY
VS = ±5V
PSRR+
PSRR-
10k 100k 1M
10M
100M
FREQUENCY (Hz)
FIGURE 12. DIFFERENTIAL PSRR vs FREQUENCY
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EL5178 pdf, datenblatt
EL5178, EL5378
Simplified Schematic
VS+
R1 R2
R3
R7
R4
R8
IN+ IN- FBP FBN
VB1 OUT+
RCD
RCD
REF
R9 R10
CC VB2 OUT-
CC
R5 R6
VS-
Description of Operation and
Application Information
Product Description
The EL5178 and EL5378 are wide bandwidth, low power and
single/differential ended to differential output amplifiers. The
EL5178 is a single channel differential amplifier. Since the IN- pin
and REF pin are tied together internally, the EL5178 can be used
as a single ended to differential converter. The EL5378 is a triple
channel differential amplifier. The EL5378 has a separate IN- pin
and REF pin for each channel. It can be used as
single/differential ended to differential converter. The EL5178
and EL5378 are internally compensated for closed loop gain of 1
or greater. Connected in gain of 2 and driving a 1kdifferential
load, the EL5178 and EL5378 have a -3dB bandwidth of
700MHz. Driving a 200differential load at gain of 2, the
bandwidth is about 320MHz. The EL5378 is available with a
power down feature to reduce the power while the amplifier is
disabled.
tied to the same bias level as the IN+ pin. For a ±5V supply, just tie
the REF pin to GND if the IN+ pin is biased at 0V with a 50or 75
termination resistor. For a single supply application, if the IN+ is
biased to half of the rail, the REF pin should be biased to half of the
rail also.
The gain setting for EL5178 is expressed in Equation 1:
VODM
=
VIN
+
1
+
R-----F----1-R---+--G---R-----F---2- 
VOCM = VREF = 0V
VODM
=
VIN
+
1
+
2--R--R---G--F- 
(EQ. 1)
Input, Output, and Supply Voltage Range
The EL5178 and EL5378 have been designed to operate with a
single supply voltage of 5V to 10V or split supplies with its total
voltage from 5V to 10V. The amplifiers have an input common
mode voltage range from -4.3V to 3.4V for ±5V supply. The
differential mode input range (DMIR) between the two inputs is
from -2.3V to +2.3V. The input voltage range at the REF pin is
from -3.3V to 3.7V. If the input common mode or differential
mode signal is outside the above-specified ranges, it will cause
the output signal to become distorted.
The output of the EL5178 and EL5378 can swing from -3.8V to
+3.8V at 1kdifferential load at ±5V supply. As the load
resistance becomes lower, the output swing is reduced.
Differential and Common Mode Gain Settings
For EL5178, since the IN- pin and REF pin are bounded together as
the REF pin in an 8 Ld package, the signal at the REF pin is part of
the common mode signal and also part of the differential mode
signal. For the true balance differential outputs, the REF pin must be
Where:
VREF = 0V
RF1 = RF2 = RF
EL5378 has a separate IN- pin and REF pin. It can be used as a
single/differential ended to differential converter. The voltage
applied at REF pin can set the output common mode voltage and
the gain is one.
The gain setting for EL5378 is expressed in Equation 2:
VODM
=
VIN
+
VI
N
-
1
+
-R----F----1--R--+--G---R-----F---2- 
VODM
=
VIN
+
VI
N
-
1
+
-2-R--R---G--F- 
(EQ. 2)
VOCM = VREF
Where:
RF1 = RF2 = RF
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