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PDF EL2250C Data sheet ( Hoja de datos )
| Número de pieza | EL2250C | |
| Descripción | 125MHz Single Supply Dual/Quad Op Amps | |
| Fabricantes | Elantec Semiconductor | |
| Logotipo |  |
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EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
Features
• Specified for +3V, +5V, or ±5V
applications
• Large input common mode range
0V < VCM < VS -1.2V
• Output swings to ground without
saturating
• -3dB bandwidth = 125MHz
• ± 0.1dB bandwidth = 30MHz
• Low supply current = 5mA (per
amplifier)
• Slew rate = 275V/µs
• Low offset voltage = 4mV max
• Output current = ±100mA
• High open loop gain = 80dB
• Differential gain = 0.05%
• Differential phase = 0.05°
Applications
• Video amplifiers
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High speed communications
• RGB printers, FAX, scanners
• Broadcast equipment
• Active filtering
Ordering Information
Part No
EL2250CN
EL2250CS
EL2250CS-T7
EL2250CS-T13
EL2450CN
EL2450CS
EL2450CS-T7
EL2450CS-T13
Package
8-Pin PDIP
8-Pin SO
8-Pin SO
8-Pin SO
14-Pin PDIP
14-Pin SO
14-Pin SO
14-Pin SO
Tape & Reel
-
-
7”
13”
-
-
7”
13”
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
MDP0031
MDP0027
MDP0027
MDP0027
General Description
The EL2250C/EL2450C are part of a family of the electronics indus-
tries fastest single supply op amps available. Prior single supply op
amps have generally been limited to bandwidths and slew rates to that
of the EL2250C/EL2450C. The 125MHz bandwidth, 275V/µs slew
rate, and 0.05%/0.05° differential gain/differential phase makes this
part ideal for single or dual supply video speed applications. With its
voltage feedback architecture, this amplifier can accept reactive feed-
back networks, allowing them to be used in analog filtering
applications. The inputs can sense signals below the bottom supply
rail and as high as 1.2V below the top rail. Connecting the load resistor
to ground and operating from a single supply, the outputs swing com-
pletely to ground without saturating. The outputs can also drive to
within 1.2V of the top rail. The EL2250C/EL2450C will output
±100mA and will operate with single supply voltages as low as 2.7V,
making them ideal for portable, low power applications.
The EL2250C/EL2450C are available in PDIP and SO packages in
industry standard pin outs. Both parts operate over the industrial tem-
perature range of -40°C to +85°C, and are part of a family of single
supply op amps. For single amplifier applications, see the
EL2150C/EL2157C. For dual and triple amplifiers with power down
and output voltage clamps, see the EL2257C/EL2357C.
Connection Diagrams
OUTA 1
8 VS+
INA- 2
-
+
A
7 OUTB
INA+ 3
6 INB-
GND 4
B
-
+
5 INB+
EL2250C
(8-Pin SO & 8-Pin PDIP)
OUTA 1
14 OUTD
INA- 2
INA+ 3
A D 13 IND-
-+ +-
12 IND+
VS+ 4
11 GND
INB+ 5
INB- 6
10 INC+
-+ +-
BC
9 INC-
OUTB 7
8 OUTC
EL2450C
(14-Pin SO & 14-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  
3dB Bandwidth vs Supply Voltage for
Non-Inverting Gains
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
Frequency Response for Various Supply
Voltages, AV = + 1
PSSR and CMRR vs Frequency
3dB Bandwidth vs Supply Voltage for
Inverting Gains
Frequency Response for Various Supply
Voltages, AV = + 2
PSRR and CMRR vs Die Temperature
Open Loop Gain and Phase vs Frequency
Open Loop Voltage Gain vs Die
Temperature
Closed Loop Output Impedance vs
Frequency
5
5 Page 
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
some maximum value which should not be exceeded for
optimum performance. If a large value of RF must be
used, a small capacitor in the few picofarad range in par-
allel with RF can help to reduce this ringing and peaking
at the expense of reducing the bandwidth.
As far as the output stage of the amplifier is concerned,
RF + RG appear in parallel with RL for gains other than
+1. As this combination gets smaller, the bandwidth
falls off. Consequently, RF has a minimum value that
should not be exceeded for optimum performance.
For AV = +1, RF = 0Ω is optimum. For AV = -1 or +2
(noise gain of 2), optimum response is obtained with RF
between 500Ω and 1kΩ. For Av = -4 or +5 (noise gain of
5), keep RF between 2kΩ and 10kΩ.
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 can be difficult when driving a standard video load
of 150Ω, because of the change in output current with
DC level. Differential Gain and Differential Phase for
the EL2250C/EL2450C are specified with the black
level of the output video signal set to +1.2V. This allows
ample room for the sync pulse even in a gain of +2 con-
figuration. This results in dG and dP specifications of
0.05% and 0.05° while driving 150Ω at a gain of +2.
Setting the black level to other values, although accept-
able, will compromise peak performance. For example,
looking at the single supply dG and dP curves for
RL=150Ω, if the output black level clamp is reduced
from 1.2V to 0.6V dG/dP will increase from
0.05%/0.05° to 0.08%/0.25° Note that in a gain of +2
configuration, this is the lowest black level allowed such
that the sync tip doesn’t go below 0V.
If your application requires that the output goes to
ground, then the output stage of the EL2250C/EL2450C,
like all other single supply op amps, requires an external
pull down resistor tied to ground. As mentioned above,
the current flowing through this resistor becomes the DC
bias current for the output stage NPN transistor. As this
current approaches zero, the NPN turns off, and dG and
dP will increase. This becomes more critical as the load
resistor is increased in value. While driving a light load,
such as 1kΩ, if the input black level is kept above 1.25V,
dG and dP are a respectable 0.03% and 0.03°.
For other biasing conditions see the Differential Gain
and Differential Phase vs. Input Voltage curves.
Output Drive Capability
In spite of their moderately low 5mA of supply current,
the EL2250C/EL2450C are capable of providing
±100mA of output current into a 10Ω load, or ±60mA
into 50Ω. With this large output current capability, a
50Ω load can be driven to ±3V with VS = ±5V, making
it an excellent choice for driving isolation transformers
in telecommunications applications.
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 de-couple the EL2250C/EL2450C from the
cable and allow extensive capacitive drive. However,
other applications may have high capacitive loads with-
out a back-termination resistor. In these applications, a
small series resistor (usually between 5 Ω and 50 Ω) 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.
Video Sync Pulse Remover Application
All CMOS Analog to Digital Converters (A/Ds) have a
parasitic latch-up problem when subjected to negative
input voltage levels. Since the sync tip contains no use-
ful video information and it is a negative going pulse, we
can chop it off.
Figure 1 shows a unity gain connected amplifier A of an
EL2250C. Figure 2 shows the complete input video sig-
nal applied at the input, as well as the output signal with
the negative going sync pulse removed.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet EL2250C.PDF ] | |
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