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PDF EL5371 Data sheet ( Hoja de datos )
| Número de pieza | EL5371 | |
| Descripción | 250MHz Differential Twisted-Pair Drivers | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
EL5171, EL5371
June 29, 2004
FN7307.4
250MHz Differential Twisted-Pair Drivers
The EL5171 and EL5371 are single
and triple 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 input
signal is single-ended and the outputs are always in
differential form.
On the EL5171 and EL5371, 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
EL5170 and EL5370.
The output common mode level for each channel is set by
the associated VREF pin, which have a -3dB bandwidth of
over 50MHz. 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 EL5171 and EL5371 are specified for operation over the
full -40°C to +85°C temperature range.
Ordering Information
PART
NUMBER
EL5171IS
PACKAGE
8-Pin SO
EL5171IS-T7
8-Pin SO
EL5171IS-T13
8-Pin SO
EL5371IU
28-Pin QSOP
EL5371IU-T7
28-Pin QSOP
EL5371IU-T13 28-Pin QSOP
TAPE &
REEL
-
7”
13”
-
7”
13”
PKG. DWG. #
MDP0027
MDP0027
MDP0027
MDP0040
MDP0040
MDP0040
Features
• Fully differential outputs and feedback
• Input range ±2.3V typ.
• 250MHz 3dB bandwidth
• 800V/µs slew rate
• Low distortion at 5MHz
• Single 5V or dual ±5V supplies
• 90mA maximum output current
• Low power - 8mA per channel
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
EL5171
(8-PIN SO)
TOP VIEW
EL5371
(28-PIN QSOP)
TOP VIEW
FBP 1
IN+ 2
REF 3
FBN 4
+
-
8 OUT+ NC 1
7 VS-
INP1 2
6 VS+ INN1 3
5 OUT- 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
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002-2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
1 page  
EL5171, EL5371
Typical Performance Curves
AV = 1, RLD = 1kΩ, CLD = 2.7pF
4
3
2
1
0 VOP-P = 200mV
-1
-2
-3 VOP-P = 1VP-P
-4
-5
-6
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 1. FREQUENCY RESPONSE
AV = 1, CLD = 2.7pF
4
3
2
1
0 RLD = 1kΩ
-1 RLD = 500Ω
-2
-3 RLD = 200Ω
-4
-5
-6
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 3. FREQUENCY RESPONSE vs RLD
RLD = 1kΩ, CLD = 2.7pF
4
3
2
1
0
-1 AV = 1
-2
-3 AV = 5 AV = 2
-4 AV = 10
-5
-6
1M
10M
100M
FREQUENCY (Hz)
1G
FIGURE 2. FREQUENCY RESPONSE FOR VARIOUS GAIN
AV = 1, RLD = 1kΩ
5
4
3
CLD = 56pF
CLD = 34pF
2 CLD = 23pF
1
0
-1 CLD = 9pF
-2 CLD = 2.7pF
-3
-4
-5
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 4. FREQUENCY RESPONSE vs CLD
AV = 2, RLD = 1kΩ, CLD = 2.7pF
10
9
8
7 RF = 1kΩ
6
5 RF = 500Ω
4
3
2 RF = 200Ω
1
0
1M
10M
100M
400M
FREQUENCY (Hz)
FIGURE 5. FREQUENCY RESPONSE
AV = 2, RF = 1kΩ, CLD = 2.7pF
10
9
8
7
6 RLD = 1kΩ
5
4 RLD = 500Ω
3
2 RLD = 200Ω
1
0
1M
10M
100M
400M
FREQUENCY (Hz)
FIGURE 6. FREQUENCY RESPONSE vs RLD
5
5 Page 
EL5171, EL5371
The maximum power dissipation allowed in a package is
determined according to:
PDMAX
=
T----J---M-----A----X-----–-----T----A---M-----A----X--
ΘJA
Where:
• TJMAX = Maximum junction temperature
• TAMAX = Maximum ambient temperature
• θJA = 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:
PD
=
i
×
VS
×
IS
M
A
X
+
VS
×
∆-R----VL----DO--
Where:
• VS = Total supply voltage
• ISMAX = Maximum quiescent supply current per channel
• ∆VO = Maximum differential output voltage of the
application
• RLD = Differential load resistance
• ILOAD = Load current
• i = Number of channels
Typical Applications
RF
By setting the two PDMAX equations equal to each other, we
can solve the output current and RLD to avoid the device
overheat.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, a good printed circuit
board layout is necessary for optimum performance. Lead
lengths should be as sort as possible. The power supply pin
must be well bypassed to reduce the risk of oscillation. For
normal single supply operation, where the VS- pin is
connected to the ground plane, a single 4.7µF tantalum
capacitor in parallel with a 0.1µF ceramic capacitor from VS+
to GND will suffice. This same capacitor combination should
be placed at each supply pin to ground if split supplies are to
be used. In this case, the VS- pin becomes the negative
supply rail.
For good AC performance, parasitic capacitance should be
kept to minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
RT RG
FBP
IN+
IN-
REF
EL5171/
EL5371
FBN
RF
50 TWISTED PAIR
IN+
50
ZO = 100Ω
EL5172/
IN- EL5372
REF
RGR
RFR
VO
FIGURE 25. TWISTED PAIR CABLE RECEIVER
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EL5371.PDF ] | |
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