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PDF EL2386CS Data sheet ( Hoja de datos )
| Número de pieza | EL2386CS | |
| Descripción | 250 MHz Triple Current Feedback Amp w/Disable | |
| Fabricantes | Elantec Semiconductor | |
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EL2386C
250 MHz Triple Current Feedback Amp w Disable
Features
Triple amplifier topology
3 mA supply current (per
amplifier)
250 MHz b3 dB bandwidth
Low cost
Fast disable
Powers down to 0 mA
Single- and dual-supply
operation down to g1 5V
0 05% 0 05 Diff gain Diff
phase into 150X
1200V ms slew rate
Large output drive current
55 mA
Available in single (EL2186C)
and dual (EL2286C) form
Non-power down versions
available in single dual and quad
(EL2180C EL2280C EL2480C)
Lower power EL2170C EL2176C
family also available
(1 mA 70 MHz) 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
Multiplexing
Video broadcast equipment
Ordering Information
Part No Temp Range Package Outline
EL2386CN b40 C to a85 C 16-Pin PDIP MDP0031
EL2386CS b40 C to a85 C 16-Pin SOIC MDP0027
General Description
The EL2386C is a triple current-feedback operational amplifier
which achieves a b3 dB bandwidth of 250 MHz at a gain of a1
while consuming only 3 mA of supply current per amplifier It
will operate with dual supplies ranging from g1 5V to g6V or
from single supplies ranging from a3V to a12V The EL2386C
also includes a disable power-down feature which reduces cur-
rent consumption to 0 mA while placing the amplifier output in
a high impedance state In spite of its low supply current the
EL2386C can output 55 mA while swinging to g4V on g5V
supplies These attributes make the EL2386C an excellent
choice for low power and or low voltage cable-driver HDSL or
RGB applications
For Single and Dual applications consider the EL2186C
EL2286C For Single Dual and Quad applications without dis-
able consider the EL2180C EL2280C or EL2480C all in indus-
try standard pin outs The EL2180C also is available in the tiny
SOT-23 package which is 28% the size of an SO8 package For
lower power applications where speed is still a concern consider
the EL2170C EL2176C family which also comes in similar Sin-
gle Dual and Quad configurations The EL2170C EL2176C
family provides a b3 dB bandwidth of 70 MHz while consum-
ing 1 mA of supply current per amplifier
Connection Diagram
EL2386C SO P-DIP
Top View
2386-1
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
1996 Elantec Inc
1 page  
EL2386C
250 MHz Triple Current Feedback Amp w Disable
Typical Performance Curves Contd
Non-Inverting Frequency
Response (Gain)
Non-Inverting Frequency
Response (Phase)
Frequency Response
for Various RF and RG
Inverting Frequency
Response (Gain)
2386-4
Inverting Frequency
Response (Phase)
2386-5
Frequency Response
for Various RL and CL
2386-6
Transimpedance (ROL)
vs Frequency
2386-7
PSRR and CMRR
vs Frequency
2386-8
2386-9
Frequency Response for
Various CINb
2386-10
2386-11
5
2386-12
5 Page 
EL2386C
250 MHz Triple Current Feedback Amp w Disable
Applications Information Contd
cial circuitry has been incorporated in the
EL2386C to reduce the variation of output im-
pedance with current output This results in dG
and dP specifications of 0 05% and 0 05 while
driving 150X at a gain of a2
Video Performance has also been measured with
a 500X load at a gain of a1 Under these condi-
tions the EL2386C has dG and dP specifications
of 0 01% and 0 01 respectively while driving
500X at AV e a1
For complete curves see the Differential Gain
and Differential Phase vs Input Voltage curves
Output Drive Capability
In spite of its low 3 mA of supply current per
amplifier the EL2386C is capable of providing a
minimum of g50 mA of output current This
output drive level is unprecedented in amplifiers
running at these supply currents With a mini-
mum g50 mA of output drive the EL2386C is
capable of driving 50X loads to g2 5V making it
an excellent choice for driving multiple video
loads in RGB applications
Driving Cables and Capacitive Loads
When used as a cable driver double termination
is always recommended for reflection-free per-
formance For those applications the back-termi-
nation series resistor will decouple the EL2386C
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 resis-
tor (usually between 5X and 50X) 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 additional resistor at the output In many
cases it is also possible to simply increase the val-
ue of the feedback resistor (RF) to reduce the
peaking
Current Limiting
The EL2386C has no internal current-limiting
circuitry If an output is shorted indefinitely the
power dissipation could easily increase such that
the part will be destroyed Maximum reliability
is maintained if the output current never exceeds
g60 mA A heat sink may be required to keep
the junction temperature below absolute maxi-
mum when an output is shorted indefinitely
Multiplexing with the EL2386C
The ENABLE pins on the EL2386C allow for
multiplexing applications Figure 1 shows an
EL2386C with all 3 outputs tied together driving
a back terminated 75X video load Three sine
waves of varying amplitudes and frequencies are
applied to the three inputs while a 1 of 3 decoder
selects one amplifier to be on at any given time
Figure 2 shows the resulting output wave form at
Figure 1
11
2386-39
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EL2386CS.PDF ] | |
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