Datasheet
LM7121
235 MHz Tiny Low Power Voltage Feedback Amplifier
General Description
The LM7121 is a high performance operational amplifier
which addresses the increasing AC performance needs of
video and imaging applications, and the size and power con-
straints of portable applications.
The LM7121 can operate over a wide dynamic range of sup-
ply voltages, from 5V (single supply) up to
±
15V (see the Ap-
plication Information section for more details). It offers an ex-
cellent speed-power product delivering 1300V/µs and 235
MHz Bandwidth (−3 dB, A
V
=
+1). Another key feature of this
operational amplifier is stability while driving unlimited ca-
pacitive loads.
Due to its Tiny SOT23-5 package, the LM7121 is ideal for
designs where space and weight are the critical parameters.
The benefits of the Tiny package are evident in small por-
table electronic devices, such as cameras, and PC video
cards. Tiny amplifiers are so small that they can be placed
anywhere on a board close to the signal source or near the
input to an A/D converter.
Features
(Typical unless otherwise noted) V
S
=
±
15V
n Easy to use voltage feedback topology
n Stable with unlimited capacitive loads
n Tiny SOT23-5 package — typical circuit layout takes half
the space of SO-8 designs
n Unity gain frequency: 175 MHz
n Bandwidth (−3 dB, A
V
=
+1, R
L
=
100Ω): 235 MHz
n Slew rate: 1300V/µs
n Supply Voltages SO-8: 5V to
±
15V
SOT23-5: 5V to
±
5V
n Characterized for: +5V,
±
5V,
±
15V
n Low supply current: 5.3 mA
Applications
n Scanners, color fax, digital copiers
n PC video cards
n Cable drivers
n Digital cameras
n ADC/DAC buffers
n Set-top boxes
Connection Diagrams
Ordering Information
Package Ordering Information NSC Drawing Package Supplied As
Number Marking
8-Pin SO-8 LM7121IM M08A LM7121IM Rails
LM7121IMX M08A LM7121IM 2.5k Tape and Reel
5-Pin SOT23-5 LM7121IM5 MA05A A03A 1k Tape and Reel
LM7121IM5X MA05A A03A 3k Tape and Reel
8-Pin SO-8
DS012348-2
Top View
5-Pin SOT23
DS012348-1
Top View
August 1999
LM7121 235 MHz Tiny Low Power Voltage Feedback Amplifier
© 1999 National Semiconductor Corporation DS012348 www.national.com