EL2257
®
Data Sheet
February 28, 2002
FN7063
125MHz Single Supply, Clamping Op Amp
Features
The EL2257 is a single supply op amp.
Prior single supply op amps have
generally been limited to bandwidths
• Specified for +3V, +5V, or ± 5V applications
• Power-down to 0µA
• Output voltage clamp
and slew rates one-fourth of that of the EL2257. 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 EL2257 will output ±100mA and will
operate with single supply voltages as low as 2.7V, making
them ideal for portable, low power applications.
• Large input common-mode range 0V < V
CM
< V - 1.2V
S
• Output swings to ground without saturating
• -3dB bandwidth = 125MHz
• ±0.1dB bandwidth = 30MHz
• Low supply current = 5mA
• Slew rate = 275V/µs
• Low offset voltage = 4mV max
• Output current = ±100mA
• High open loop gain = 80dB
• Differential gain = 0.05%
The EL2257 has a high speed disable feature. Applying a
low logic level to all ENABLE pins reduces the supply current
to 0µA within 50ns. Each amplifier has its own ENABLE pin.
This is useful for both multiplexing and reducing power
consumption.
• Differential phase = 0.05°
Applications
• Video amplifiers
The EL2257 also has an output voltage clamp feature. This
clamp is a fast recovery (< 7ns) output clamp that prevents
the output voltage from going above the preset clamp
voltage. This feature is desirable for A/D applications, as A/D
converters can require long times to recover if overdriven.
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High speed communications
• RGB printer, fax, scanner applications
• Broadcast equipment
• Active filtering
The EL2257 is available in 14-pin SO (0.150") and 14-pin
PDIP packages and operates over the industrial temperature
range of -40°C to +85°C. For single amplifier applications,
see the EL2150 and EL2157. For space-saving, industry-
standard pinout dual and quad applications, see the EL2250
and EL2450.
• Multiplexing
Ordering Information
Pinout
TAPE &
EL2257
[14-PIN SO (0.150”), PDIP]
TOP VIEW
PART NUMBER
EL2257CS
PACKAGE
REEL
PKG. NO.
MDP0027
MDP0027
MDP0027
MDP0031
14-Pin SO (0.150")
14-Pin SO (0.150")
14-Pin SO (0.150")
14-Pin PDIP
-
7”
13”
-
EL2257CS-T7
EL2257CS-T13
EL2257CN
INA+
CLAMPA
ENABLEA
GND
1
2
3
4
5
6
7
14 INA-
+
-
13 OUTA
12
11
NC
VS+
ENABLEB
CLAMPB
INB+
10 NC
+
-
9
8
OUTB
INB-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
1
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
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