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EL2280CS-T13 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL2280CS-T13
Beschreibung 250MHz/3mA Current Mode Feedback Amplifiers
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 15 Seiten
EL2280CS-T13 Datasheet, Funktion
®
Data Sheet
EL2180, EL2280, EL2480
November 14,2002
FN7055
250MHz/3mA Current Mode Feedback
Amplifiers
The EL2180, EL2280, and EL2480 are
single, dual, and quad current-
feedback operational amplifiers which
achieve a -3dB bandwidth of 250MHz at a gain of +1 while
consuming only 3mA of supply current per amplifier. They
will operate with dual supplies ranging from ±1.5V to ±6V, or
from single supplies ranging from +3V to +12V. In spite of
their low supply current, the EL2480 and the EL2280 can
output 55mA while swinging to ±4V on ±5V supplies. The
EL2180 can output 100mA with similar output swings. These
attributes make the EL2180, EL2280, and EL2480 excellent
choices for low power and/or low voltage cable-driver, HDSL,
or RGB applications.
For applications where board space is extremely critical, the
EL2180 is available in the tiny 5-pin SOT-23 package, which
has a footprint 28% the size of an 8-pin SO.
For single, dual, and triple applications with disable, consider
the EL2186 (8-pin single), EL2286 (14-pin dual), or EL2386
(16-pin triple). For lower power applications where speed is
still a concern, consider the EL2170/EL2176 family which
also comes in similar single, dual, and quad configurations.
The EL2170/EL2176 family provides a -3dB bandwidth of
70MHz while consuming 1mA of supply current per amplifier.
Ordering Information
PART NUMBER
EL2180CN
EL2180CS
EL2180CS-T7
EL2180CS-T13
EL2180CW-T7
EL2180CW-T13
EL2280CN
EL2280CS
EL2280CS-T7
EL2280CS-T13
EL2480CN
EL2480CS
EL2480CS-T7
EL2480CS-T13
PACKAGE TAPE & REEL PKG. NO.
8-Pin PDIP
- MDP0031
8-Pin SO
- MDP0027
8-Pin SO
7” MDP0027
8-Pin SO
13” MDP0027
5-Pin SOT-23* 7” MDP0038
5-Pin SOT-23* 13” MDP0038
8-Pin PDIP
- MDP0031
8-Pin SO
- MDP0027
8-Pin SO
7” MDP0027
8-Pin SO
13” MDP0027
14-Pin PDIP
- MDP0031
14-Pin SO
- MDP0027
14-Pin SO
7” MDP0027
14-Pin SO
13” MDP0027
NOTE:
*EL2180CW symbol is .Cxxx where xxx represents date code
Features
• Single (EL2180), dual (EL2280), and quad (EL2480)
topologies
• 3mA supply current (per amplifier)
• 250MHz -3dB bandwidth
• Tiny SOT23-5 package (EL2180)
• Low cost
• Single- and dual-supply operation down to ±1.5V
• 0.05%/0.05° diff. gain/diff. phase into 150
• 1200V/µs slew rate
• Large output drive current - 100mA (EL2180), 55mA
(EL2280), 55mA (EL2480)
• Also available with disable in single (EL2186), dual
(EL2286), and triple (EL2386)
• Lower power EL2170/EL2176 family available
(1mA/70MHz) in single, dual, and quad
Applications
• Low power/battery applications
• HDSL amplifiers
• Video amplifiers
• Cable drivers
• RGB amplifiers
• Test equipment amplifiers
• Current to voltage converters
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. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.






EL2280CS-T13 Datasheet, Funktion
Typical Performance Curves
EL2180, EL2280, EL2480
Non-Inverting Frequency
Response (Gain)
(PDIP and SO Packages)
Non–Inverting Frequency
Response (Phase)
(PDIP and SO Packages)
Frequency Response
for Various RF and RG
(PDIP and SO Packages)
Inverting Frequency
Response (Gain)
(PDIP and SO Packages)
Inverting Frequency
Response (Phase)
(PDIP and SO Packages)
Frequency Response
for Various RL and CL
(PDIP and SO Packages)
Transimpedance (ROL) vs
Frequency
PSRR and CMRR
vs Frequency
Frequency Response for
Various CIN-
6

6 Page









EL2280CS-T13 pdf, datenblatt
EL2180, EL2280, EL2480
Supply Voltage Range and Single-Supply
Operation
The EL2180, EL2280, and EL2480 have been designed to
operate with supply voltages having a span of greater than
3V, and less than 12V. In practical terms, this means that the
EL2180, EL2280, and EL2480 will operate on dual supplies
ranging from ±1.5V to ±6V. With a single-supply, the EL2180,
EL2280, and EL2480 will operate from +3V to +12V.
As supply voltages continue to decrease, it becomes
necessary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2180, EL2280, and EL2480 have an input voltage range
that extends to within 1V of either supply. So, for example, on
a single +5V supply, the EL2180, EL2280, and EL2480 have
an input range which spans from 1V to 4V. The output range
of the EL2180, EL2280, and EL2480 is also quite large,
extending to within 1V of the supply rail. On a ±5V supply,
the output is therefore capable of swinging from -4V to +4V.
Single-supply output range is even larger because of the
increased negative swing due to the external pull-down
resistor to ground. On a single +5V supply, output voltage
range is about 0.3V to 4V.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150, because of the change in output current with DC
level. Until the EL2180, EL2280, and EL2480, good
Differential Gain could only be achieved by running high idle
currents through the output transistors (to reduce variations
in output impedance). These currents were typically
comparable to the entire 3mA supply current of each
EL2180, EL2280, and EL2480 amplifier! Special circuitry
has been incorporated in the EL2180, EL2280, and EL2480
to reduce the variation of output impedance with current
output. This results in dG and dP specifications of 0.05%
and 0.05° while driving 150at a gain of +2.
Video performance has also been measured with a 500
load at a gain of +1. Under these conditions, the EL2180,
EL2280, and EL2480 have dG and dP specifications of
0.01% and 0.01° respectively while driving 500at AV = +1.
Output Drive Capability
In spite of its low 3mA of supply current, the EL2180 is
capable of providing a minimum of ±80mA of output current.
Similarly, each amplifier of the EL2280 and the EL2480 is
capable of providing a minimum of ±50mA. These output drive
levels are unprecedented in amplifiers running at these supply
currents. With a minimum ±80mA of output drive, the EL2180
is capable of driving 50loads to ±4V, making it an excellent
choice for driving isolation transformers in
telecommunications applications. Similarly, the ±50mA
12
minimum output drive of each EL2280 and EL2480 amplifier
allows swings of ±2.5V into 50loads.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will decouple
the EL2180, EL2280, and EL2480 from the cable and allow
extensive capacitive drive. However, other applications may
have high capacitive loads without a back-termination resistor.
In these applications, a small series resistor (usually between
5and 50) can be placed in series with the output to
eliminate most peaking. The gain resistor (RG) can then be
chosen to make up for any gain loss which may be created by
this additional resistor at the output. In many cases it is also
possible to simply increase the value of the feedback resistor
(RF) to reduce the peaking.
Current Limiting
The EL2180, EL2280, and EL2480 have no internal current-
limiting circuitry. If any output is shorted, it is possible to
exceed the Absolute Maximum Ratings for output current or
power dissipation, potentially resulting in the destruction of the
device.
Power Dissipation
With the high output drive capability of the EL2180, EL2280,
and EL2480, it is possible to exceed the 150°C Absolute
Maximum junction temperature under certain very high load
current conditions. Generally speaking, when RL falls below
about 25, it is important to calculate the maximum junction
temperature (TJMAX) for the application to determine if power-
supply voltages, load conditions, or package type need to be
modified for the EL2180, EL2280, and EL2480 to remain in
the safe operating area. These parameters are calculated as
follows [1]:
TJMAX = TMAX + JA × n × PDMAX)
where:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
n = Number of amplifiers in the package
PDMAX = Maximum power dissipation of each amplifier in
the package
PDMAX for each amplifier can be calculated as follows [2]:
PDMAX
=
(2 × VS × ISMAX ) + (VS
-
VOUT
MAX
)
×
-V----O----U----T----M-----A----X--
RL
where:
VS = Supply voltage
ISMAX = Maximum supply current of 1 amplifier
VOUTMAX = Maximum output voltage of the application
RL = Load resistance

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