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EL2186CN Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL2186CN
Beschreibung 250MHz/3mA Current Mode Feedback Amp w/Disable
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 19 Seiten
EL2186CN Datasheet, Funktion
EL2186C, EL2286C
250MHz/3mA Current Mode Feedback Amp w/Disable
Features
• Single (EL2186C) and dual
(EL2286C) topologies
• 3mA supply current (per amplifier)
• 250MHz -3dB bandwidth
• Low cost
• Fast disable
• Powers down to 0mA
• 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 (EL2186C)
55mA (EL2286C)
• Also available without disable in
single (EL2180C), dual
(EL2280C) and quad (EL2480C)
• Lower power EL2170C/EL2176C
family also available (1 mA/
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
Ordering Information
Part No.
EL2186CN
EL2186CS
EL2286CN
EL2286CS
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package
8-Pin PDIP
8-Pin SOIC
14-Pin PDIP
14-Pin SOIC
Outline #
MDP0031
MDP0027
MDP0031
MDP0027
General Description
The EL2186C/EL2286C are single/dual 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. The EL2186C/EL2286C also
include a disable/power-down feature which reduces current con-
sumption to 0mA while placing the amplifier output in a high
impedance state. In spite of its low supply current, the EL2286C can
output 55mA while swinging to ±4V on ±5V supplies. The EL2186C
can output 100mA with similar output swings. These attributes make
the EL2186C/EL2286C excellent choices for low power and/or low
voltage cable-driver, HDSL, or RGB applications.
For Single, Dual and Quad applications without disable, consider the
EL2180C (8-Pin Single), EL2280C (8-Pin Dual) or EL2480C (14-Pin
Quad). For lower power applications where speed is still a concern,
consider the EL2170C/El2176C family which also comes in similar
Single, Dual and Quad configurations. The EL2170C/EL2176C fam-
ily provides a -3dB bandwidth of 70MHz while consuming 1mA of
supply current per amplifier.
Connection Diagrams
EL2186C SO, P-DIP
EL2286C SO, P-DIP
Manufactured under U.S. Patent No. 5,418,495
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.






EL2186CN Datasheet, Funktion
EL2186C, EL2286C
250MHz/3mA Current Mode Feedback Amp w/Disable
Voltage and Current
Noise vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Output Voltage
Swing vs Frequency
-3dB Bandwidth and Peaking
vs Supply Voltage for
Various Non-Inverting Gains
-3dB Bandwidth and Peaking
vs Supply Voltage for
Various Inverting Gains
Output Voltage Swing
vs Supply Voltage
Supply Current vs
Supply Voltage
Common-Mode Input Range
vs Supply Voltage
Slew Rate vs
Supply Voltage
6

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EL2186CN pdf, datenblatt
EL2186C, EL2286C
250MHz/3mA Current Mode Feedback Amp w/Disable
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
EL2186C/EL2286C 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 EL2186C
is capable of providing a minimum of ±80mA of output
current. Similarly, each amplifier of the EL2286C is
capable of providing a minimum of ±50mA. These out-
put drive levels are unprecedented in amplifiers running
at these supply currents. With a minimum ±80mA of
output drive, the EL2186C is capable of driving 50
loads to ±4V, making it an excellent choice for driving
isolation transformers in telecommunications applica-
tions. Similarly, the ±50mA minimum output drive of
each EL2286C 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 resis-
tor will decouple the EL2186C/EL2286C 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 peak-
ing. The gain resistor (RG) can then be chosen to make
up for any gain loss which may be created by this addi-
tional 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 EL2186C/EL2286C have no internal current-limit-
ing circuitry. If any output is shorted, it is possible to
exceed the Absolute Maximum Ratings for output cur-
rent or power dissipation, potentially resulting in the
destruction of the device.
Power Dissipation
With the high output drive capability of the
EL2186C/EL2286C, 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 calcu-
late 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
EL2186C/EL2286C to remain in the safe operating area.
These parameters are calculated as follows:
TJMAX = TMAX + (θJA * n * PDMAX) [1]
where:
TMAX=Maximum Ambient Temperature
θJA=Thermal Resistance of the Package
n=Number of Amplifiers in the Package
PDMAX=Maximum Power Dissipation of Each Ampli-
fier in the Package.
PDMAX for each amplifier can be calculated as follows:
PDMAX = (2 * VS * ISMAX) + (VS - VOUTMAX) *
(VOUTMAX/RL) [2]
where:
VS=Supply Voltage
ISMAX=Maximum Supply Current of 1 Amplifier
VOUTMAX=Max. Output Voltage of the Application
RL=Load Resistance
12

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