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PDF EL5374 Data sheet ( Hoja de datos )
| Número de pieza | EL5374 | |
| Descripción | 550MHz Differential Twisted-Pair Drivers | |
| Fabricantes | Intersil | |
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DATASHEET
550MHz Differential Twisted-Pair Drivers
EL5174, EL5374
The EL5174 and EL5374 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 EL5174 and EL5374, two feedback inputs provide the
user with the ability to set the gain of each device (stable at
minimum gain of one). For a fixed gain of two, please see the
EL5173, EL5373 data sheet (FN7312).
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 EL5174 is available in a 8 Ld SOIC package and the EL5374 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
• 550MHz 3dB bandwidth
• 1100V/µs slew rate
• Low distortion at 5MHz
• Single 5V or dual ±5V supplies
• 60mA maximum output current
• Low power - 12.5mA per channel
• Pb-free (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
EL5174
(8 LD SOIC)
TOP VIEW
FBP 1
8 OUT+
IN+ 2
REF 3
+
-
7 VS-
6 VS+
FBN 4
5 OUT-
EL5374
(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 12, 2015
FN7313.9
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 2003-2005, 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.
1 page  
Connection Diagrams
IN+
REF
RS1
50
RG
RS1
50
RF1
0 -5V
1 FBP
OUT 8
2 INP
VSN 7
3 REF
VSP 6
4 FBN OUTB 5
RF2
0
+5V
FIGURE 1. EL5174
CL1
5pF
OUT
RLD
1k
OUTB
CL2
5pF
INP1
INN1
REF1
1 NC
+5V
OUT1 28
2 INP1
3 INN1
FBP1 27
FBN1 26
RG
4 REF1 OUT1B 25
INP2
INN2
REF2
INP3
INN3
REF3
RSP1 RSN1 RSR1 RSP2 RSN2 RSR2 RSP3 RSN3 RSR3
50 50 50 50 50 50 50 50 50
5 NC
VSP 24
6 INP2
VSN 23
7 INN2
OUT2 22
8 REF2
9 NC
FBP2 21
FBN2 20
RG
10 INP3 OUT2B 19
11 INN3
OUT3 18
12 REF3
13 NC
FBP3 17
FBN3 16
RG
14 EN
OUT3B 15
ENABLE
-5V
FIGURE 2. EL5374
RF
0
RF
0
RF
0
RF
0
RF
0
RF
0
RLD1
1k
RLD2
1k
RLD3
1k
CL1
CL1B
CL2
CL2B
CL3
CL3B
5pF 5pF
5pF 5pF
5pF 5pF
5 Page 
EL5174, EL5374
RF1
VIN+
VIN- RG
VREF
FBP
IN+
IN-
REF
FBN
RF2
FIGURE 26.
VO+
VO-
Choice of Feedback Resistor and Gain
Bandwidth Product
For applications that require a gain of +1, no feedback resistor
is required. Just short the OUT+ pin to FBP pin and OUT- pin to
FBN pin. For gains greater than +1, the feedback resistor
forms a pole with the parasitic capacitance at the inverting
input. As this pole becomes smaller, the amplifier's phase
margin is reduced. This causes ringing in the time domain and
peaking in the frequency domain. Therefore, RF has some
maximum value that should not be exceeded for optimum
performance. If a large value of RF must be used, a small
capacitor in the few Pico farad range in parallel with RF can
help to reduce the ringing and peaking at the expense of
reducing the bandwidth.
The bandwidth of the EL5174 and EL5374 depends on the load
and the feedback network. RF and RG appear in parallel with
the load for gains other than +1. As this combination gets
smaller, the bandwidth falls off. Consequently, RF also has a
minimum value that should not be exceeded for optimum
bandwidth performance. For gain of +1, RF = 0 is optimum. For
the gains other than +1, optimum response is obtained with RF
between 500 to 1k.
The EL5174 and EL5374 have a gain bandwidth product of
200MHz for RLD = 1k. For gains 5, its bandwidth can be
predicted by Equation 3:
Gain BW = 200MHz
(EQ. 3)
Driving Capacitive Loads and Cables
The EL5174 and EL5374 can drive a 23pF differential
capacitor in parallel with 1k differential load with less than
5dB of peaking at gain of +1. If less peaking is desired in
applications, a small series resistor (usually between 5 to
50) can be placed in series with each output to eliminate
most peaking. However, this will reduce the gain slightly. If the
gain setting is greater than 1, the gain resistor RG can then be
chosen to make up for any gain loss, which may be created by
the additional series resistor at the output.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor at the
amplifier's output will isolate the amplifier from the cable and
allow extensive capacitive drive. However, other applications
may have high capacitive loads without a back-termination
resistor. Again, a small series resistor at the output can help to
reduce peaking.
Disable/Power-Down (for EL5374 only)
The EL5374 can be disabled and its outputs placed in a high
impedance state. The turn-off time is about 1.2µs and the
turn-on time is about 130ns. When disabled, the amplifier's
supply current is reduced to 1.7µA for IS+ and 120µA for IS-
typically, thereby effectively eliminating the power
consumption. The amplifier's power-down can be controlled by
standard CMOS signal levels at the EN pin. The applied logic
signal is relative to the VS+ pin. Letting the EN pin float or
applying a signal that is less than 1.5V below VS+ will enable
the amplifier. The amplifier will be disabled when the signal at
the EN pin is above VS+ - 0.5V.
Output Drive Capability
The EL5174 and EL5374 have internal short circuit protection. Its
typical short circuit current is ±60mA. If the output is shorted
indefinitely, the power dissipation could easily increase such that
the part will be destroyed. Maximum reliability is maintained if
the output current never exceeds ±60mA. This limit is set by the
design of the internal metal interconnections.
Power Dissipation
With the high output drive capability of the EL5174 and EL5374,
it is possible to exceed the +135°C absolute maximum junction
temperature under certain load current conditions. Therefore, it
is important to calculate the maximum junction temperature for
the application to determine if the load conditions or package
types need to be modified for the amplifier to remain in the safe
operating area.
The maximum power dissipation allowed in a package is
determined according to Equation 4:
PDMAX
=
T----J---M-----A----X-----–-----T----A---M-----A----X--
JA
(EQ. 4)
Where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
JA = Thermal resistance of the package
The maximum power dissipation actually produced by an IC is
the total quiescent supply current times the total power supply
voltage, plus the power in the IC due to the load, or as
expressed in Equation 5:
PD
=
i
V
STO
T
IS
MAX
+
V
S
T
O
T
–
VO
-R----VL----DO--
(EQ. 5)
Where:
VSTOT = Total supply voltage = VS+ - VS-
ISMAX = Maximum quiescent supply current per channel
VO = Maximum differential output voltage of the
application
RLD = Differential load resistance
Submit Document Feedback 11
FN7313.9
August 12, 2015
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet EL5374.PDF ] | |
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