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PDF EL2480CS-T7 Data sheet ( Hoja de datos )
| Número de pieza | EL2480CS-T7 | |
| Descripción | 250MHz / 3mA Current Mode Feedback Amplifiers | |
| Fabricantes | Elantec Semiconductor | |
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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 150Ω
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.
1 page  
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
Typical Performance Curves
Non-Inverting Frequency
Response (Gain)
(PDIP and SOIC Packages)
Non–Inverting Frequency
Response (Phase)
(PDIP and SOIC Packages)
Frequency Response
for Various RF and RG
(PDIP and SOIC Packages)
Inverting Frequency
Response (Gain)
(PDIP and SOIC Packages)
Inverting Frequency
Response (Phase)
(PDIP and SOIC Packages)
Frequency Response
for Various RL and CL
(PDIP and SOIC Packages)
Transimpedance (ROL) vs
Frequency
PSRR and CMRR
vs Frequency
Frequency Response for
Various CIN-
5
5 Page 
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
Feedback Resistor Values
The EL2180C/EL2280C/EL2480C have been designed
and specified at gains of +1 and +2 with RF = 750Ω in
PDIP and SO packages and RF = 560Ω in 5-pin SOT23
package. These values of feedback resistors give
250MHz of -3dB bandwidth at AV = +1 with about
2.5dB of peaking, and 180MHz of -3dB bandwidth at
AV = +2 with about 0.1dB of peaking. The 5-pin SOT23
package is characterized with a smaller value of feed-
back resistor, for a given bandwidth, to compensate for
lower parasitics within both the package itself and the
printed circuit board where it will be placed. Since the
EL2180C/EL2280C/EL2480C are current-feedback
amplifiers, it is also possible to change the value of RF to
get more bandwidth. As seen in the curve of Frequency
Response For Various RF and RG, bandwidth and peak-
ing can be easily modified by varying the value of the
feedback resistor.
Because the EL2180C/EL2280C/EL2480C are current-
feedback amplifiers, their gain-bandwidth product is not
a constant for different closed-loop gains. This feature
actually allows the EL2180C/EL2280C/EL2480C to
maintain about the same -3dB bandwidth, regardless of
closed-loop gain. However, as closed-loop gain is
increased, bandwidth decreases slightly while stability
increases. Since the loop stability is improving with
higher closed-loop gains, it becomes possible to reduce
the value of RF below the specified 560Ω and 750Ω and
still retain stability, resulting in only a slight loss of
bandwidth with increased closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL2180C/EL2280C/EL2480C 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 EL2180C/EL2280C/EL2480C will oper-
ate on dual supplies ranging from ±1.5V to ±6V. With a
single-supply, the EL2180C/EL2280C/EL2480C will
operate from +3V to +12V.
As supply voltages continue to decrease, it becomes nec-
essary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2180C/EL2280C/EL2480C have an input voltage
range that extends to within 1V of either supply. So, for
example, on a single +5V supply, the EL2180C/
EL2280C/EL2480C have an input range which spans
from 1V to 4V. The output range of the
EL2180C/EL2280C/EL2480C is also quite large,
extending to within 1V of the supply rail. On a ±5V sup-
ply, 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 exter-
nal 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 fre-
quency response as DC levels are changed at the output.
This is especially difficult when driving a standard video
load of 150Ω, because of the change in output current
with DC level. Until the EL2180C/EL2280C/EL2480C,
good Differential Gain could only be achieved by run-
ning high idle currents through the output transistors (to
reduce variations in output impedance). These currents
were typically comparable to the entire 3mA supply cur-
rent of each EL2180C/EL2280C/EL2480C amplifier!
Special circuitry has been incorporated in the
EL2180C/EL2280C/EL2480C 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
150Ω at a gain of +2.
Video Performance has also been measured with a 500Ω
load at a gain of +1. Under these conditions, the
EL2180C/EL2280C/EL2480C have dG and dP specifi-
cations of 0.01% and 0.01° respectively while driving
500Ω at AV = +1.
Output Drive Capability
In spite of its low 3mA of supply current, the EL2180C
is capable of providing a minimum of ±80mA of output
current. Similarly, each amplifier of the EL2280C and
the EL2480C is capable of providing a minimum of
±50mA. These output drive levels are unprecedented in
amplifiers running at these supply currents. With a min-
imum ±80mA of output drive, the EL2180C is capable
of driving 50Ω loads to ±4V, making it an excellent
choice for driving isolation transformers in telecommu-
nications applications. Similarly, the ±50mA minimum
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet EL2480CS-T7.PDF ] | |
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