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PDF EL2250 Data sheet ( Hoja de datos )
| Número de pieza | EL2250 | |
| Descripción | (EL2250 / EL2450) 125MHz Single Supply Dual/Quad Op Amps | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
EL2250, EL2450
May 19, 2006
FN7061.3
125MHz Single Supply Dual/Quad Op Amps
The EL2250/EL2450 are part of a family of the electronics
industries fastest single supply op amps available. Prior
single supply op amps have generally been limited to
bandwidths and slew rates to that of the EL2250/EL2450.
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 feedback 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
completely to ground without saturating. The outputs can
also drive to within 1.2V of the top rail. The EL2250/EL2450
will output ±100mA and will operate with single supply
voltages as low as 2.7V, making them ideal for portable, low
power applications.
The EL2250/EL2450 are available in PDIP and SO
packages in industry standard pin outs. Both parts operate
over the industrial temperature range of -40°C to +85°C, and
arewww.DataSheet4U.com part of a family of single supply op amps. For single
amplifier applications, see the EL2150/EL2157. For dual and
triple amplifiers with power down and output voltage clamps,
see the EL2257/EL2357.
Ordering Information
PART TAPE &
PKG.
PART NUMBER MARKING REEL PACKAGE DWG. #
EL2250CN
EL2250CN - 8 Ld PDIP MDP0031
EL2250CS
2250CS
- 8 Ld SO MDP0027
EL2250CS-T7 2250CS
7” 8 Ld SO MDP0027
EL2250CS-T13 2250CS
13” 8 Ld SO MDP0027
EL2250CSZ
(Note)
2250CSZ
- 8 Ld SO MDP0027
(Pb-free)
EL2250CSZ-T7 2250CSZ
(Note)
7” 8 Ld SO MDP0027
(Pb-free)
EL2250CSZ-T13 2250CSZ
(Note)
13” 8 Ld SO MDP0027
(Pb-free)
EL2450CN
EL2450CN - 14 Ld PDIP MDP0031
EL2450CS
2450CS
- 14 Ld SO MDP0027
EL2450CS-T7 2450CS
7” 14 Ld SO MDP0027
EL2450CS-T13 2450CS
13” 14 Ld SO MDP0027
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
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°
• Pb-free plus anneal available (RoHS compliant)
Applications
• Video amplifiers
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High speed communications
• RGB printers, FAX, scanners
• Broadcast equipment
• Active filtering
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002-2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
Typical Performance Curves
Non-Inverting Frequency
Response (Gain)
EL2250, EL2450
Non-Inverting Frequency
Response (Phase)
3dB Bandwidth vs Temperature for
Non-Inverting Gains
Inverting Frequency Response
(Gain)
Inverting Frequency Response
(Phase)
3dB Bandwidth vs Temperature for
Inverting Gains
Frequency Response for Various RL
Frequency Response for Various CL
Non-Inverting Frequency
Response vs Common Mode
Voltage
5 FN7061.3
May 19, 2006
5 Page 
EL2250, EL2450
The output range of the EL2250/EL2450 is also quite large.
It includes the negative rail, and extends to within 1V of the
top supply rail with a 1kΩ load. On a +5V supply, the output
is therefore capable of swinging from 0V to +4V. On split
supplies, the output will swing ±4V. If the load resistor is tied
to the negative rail and split supplies are used, the output
range is extended to the negative rail.
Choice Of Feedback Resistor, RF
The feedback resistor forms a pole with the input
capacitance. As this pole becomes larger, phase margin is
reduced. This increases ringing in the time domain and
peaking in the frequency domain. Therefore, RF has 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 parallel 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
frequency 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
EL2250/EL2450 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 configuration. 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 acceptable, 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 EL2250/EL2450, 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
EL2250/EL2450 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 resistor will de-
couple the EL2250/EL2450 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 5Ω and 50Ω) 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 useful 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
EL2250. Figure 2 shows the complete input video signal
applied at the input, as well as the output signal with the
negative going sync pulse removed.
FIGURE 1.
11 FN7061.3
May 19, 2006
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet EL2250.PDF ] | |
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