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EL2480CN Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL2480CN
Beschreibung 250MHz / 3mA Current Mode Feedback Amplifiers
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 17 Seiten
EL2480CN Datasheet, Funktion
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
Features
• Single, dual, and quad topologies
• 3mA supply current (per amplifier)
• 250MHz -3dB bandwidth
• 1200V/µs slew rate
• Tiny package package options
(SOT23, LPP)
• Low cost
• Single- and dual-supply operation
down to ±1.5V
• 0.05%/0.05° diff. gain/diff. phase
into 150
Applications
• Low power/battery applications
• HDSL amplifiers
• Video amplifiers
• Cable drivers
• RGB amplifiers
• Test equipment amplifiers
• Current to voltage converters
General Description
The EL2180C/EL2280C/EL2480C are single/dual/quad current-feed-
back operational amplifiers that 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 EL2480C and the EL2280C can output
55mA while swinging to ±4V on ±5V supplies. The EL2180C can out-
put 100mA with similar output swings. These attributes make the
EL2180C/EL2280C/EL2480C excellent choices for low power and/or
low voltage cable driver, HDSL, or RGB applications.
For applications where board space is extremely critical, the EL2180C
is available in the tiny 5-pin SOT23 package, with a footprint size 28%
of an 8-pin SO. The EL2480C is also available in a 24-pin LPP pack-
age. All are specified for operation over the full -40°C to +85°C
temperature range.
Single, dual, and triple versions are also available with the enable
function (EL2186C, EL2286C, and EL2386C).
Connection Diagrams
Ordering Information
Part No
EL2180CN
EL2180CS
EL2180CS-T7
EL2180CS-T13
EL2180CW-T7
EL2180CW-T13
EL2280CN
EL2280CS
EL2280CS-T7
EL2280CS-T13
EL2480CN
EL2480CS
EL2480CS-T7
EL2480CS-T13
EL2480CL
EL2480CL-T7
EL2480CL-T13
Package
8-Pin PDIP
8-Pin SO
8-Pin SO
8-Pin SO
5-Pin SOT23
5-Pin SOT23
8-Pin PDIP
8-Pin SO
8-Pin SO
8-Pin SO
14-Pin PDIP
14-Pin SO
14-Pin SO
14-Pin SO
24-Pin LPP
24-Pin LPP
24-Pin LPP
Tape &
Reel
-
-
7”
13”
7”
13”
-
-
7”
13”
-
-
7”
13”
-
7”
13”
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
MDP0038
MDP0038
MDP0031
MDP0027
MDP0027
MDP0027
MDP0031
MDP0027
MDP0027
MDP0027
MDP0046
MDP0046
MDP0046
NC 1
8 NC
IN- 2
IN+ 3
-
+
7 VS+
6 OUT
VS- 4
5 NC
EL2180C
(8-Pin SO & 8-Pin PDIP)
OUTA 1
8 VS+
INA- 2
-
+
A
7 OUTB
INA+ 3
6 INB-
VS- 4
B
-
+
5 INB+
EL2280C
(8-Pin SO & 8-Pin PDIP)
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.






EL2480CN Datasheet, Funktion
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
Typical Performance Curves
Voltage and Current
Noise vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Output Voltage
Swing vs Frequency
-3 dB Bandwidth and Peaking
vs Supply Voltage for
Various Non-Inverting Gains
-3 dB 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

6 Page









EL2480CN pdf, datenblatt
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
output drive of each EL2280C and EL2480C 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 EL2180C/EL2280C/EL2480C
from the cable and allow extensive capacitive drive.
However, other applications may have high capacitive
loads without a back-termination resistor. In these appli-
cations, 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 feed-
back resistor (RF) to reduce the peaking.
Current Limiting
The EL2180C/EL2280C/EL2480C have no internal cur-
rent-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
EL2180C/EL2280C/EL2480C, it is possible to exceed
the 150°C Absolute Maximum junction temperature
under certain very high load current conditions. Gener-
ally speaking, when RL falls below about 25, it is
important to calculate the maximum junction tempera-
ture (TJMAX) for the application to determine if power-
supply voltages, load conditions, or package type need
to be modified for the EL2180C/EL2280C/EL2480C to
remain in the safe operating area. These parameters are
calculated as follows:
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:
PDMAX = (2 × VS × ISMAX ) + (VS – VOUTMAX ) × V-----O----U--R--T---L-M-----A----X--
where:
VS = Supply Voltage
ISMAX = Maximum Supply Current of 1 Amplifier
VOUTMAX = Maximum Output Voltage of the
Application
RL = Load Resistance
12

12 Page





SeitenGesamt 17 Seiten
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