lm7301-mdc National Semiconductor Corporation, lm7301-mdc Datasheet - Page 10

• Manufacturer Part Number: lm7301-mdc
• Description: Low Power, 4 Mhz Gbw, Rail-to-rail Input-output Operational Amplifier In Tinypak ?ackage
• Manufacturer: National Semiconductor Corporation

www.national.com
Applications Information
cause a calculated rise of 113˚C. This can raise the junction
temperature to above the absolute maximum temperature of
150˚C.
Operating from split supplies greatly reduces the power
dissipated when the output is shorted. Operating on
supplies can only cause a temperature rise of 29˚C in the
8-pin SOIC and 57˚C in the 5-pin SOT23 package, assuming
the short is to ground.
SPICE Macromodel
A SPICE macromodel for this and many other National
Semiconductor operational amplifiers is available, at no
charge, from the NSC Customer Support Center at 800-272-
9959 or on the World Wide Web at http://www.national.com/
models.
WIDE SUPPLY RANGE
The high power-supply rejection ratio (PSRR) and common-
mode rejection ratio (CMRR) provide precision performance
when operated on battery or other unregulated supplies.
This advantage is further enhanced by the very wide supply
range (2.2V–30V, guaranteed) offered by the LM7301. In
situations where highly variable or unregulated supplies are
present, the excellent PSRR and wide supply range of the
LM7301 benefit the system designer with continued preci-
sion performance, even in such adverse supply conditions.
SPECIFIC ADVANTAGES OF 5-Pin SOT23 (TinyPak)
The obvious advantage of the 5-pin SOT23, TinyPak, is that
it can save board space, a critical aspect of any portable or
miniaturized system design. The need to decrease overall
system size is inherent in any handheld, portable, or light-
weight system application.
Furthermore, the low profile can help in height limited de-
signs, such as consumer hand-held remote controls, sub-
notebook computers, and PCMCIA cards.
An additional advantage of the tiny package is that it allows
better system performance due to ease of package place-
ment. Because the tiny package is so small, it can fit on the
board right where the op amp needs to be placed for optimal
performance, unconstrained by the usual space limitations.
This optimal placement of the tiny package allows for many
system enhancements, not easily achieved with the con-
straints of a larger package. For example, problems such as
system noise due to undesired pickup of digital signals can
be easily reduced or mitigated. This pick-up problem is often
caused by long wires in the board layout going to or from an
op amp. By placing the tiny package closer to the signal
source and allowing the LM7301 output to drive the long
wire, the signal becomes less sensitive to such pick-up. An
overall reduction of system noise results.
Ordering Information
5-Pin SOT23
8-Pin SOIC
Package
Part Number
LM7301IM5X
LM7301IMX
LM7301IM5
LM7301IM
(Continued)
Package Marking
±
LM7301IM
15V
A04A
10
Often times system designers try to save space by using
dual or quad op amps in their board layouts. This causes a
complicated board layout due to the requirement of routing
several signals to and from the same place on the board.
Using the tiny op amp eliminates this problem.
Additional space savings parts are available in tiny packages
from National Semiconductor, including low power amplifi-
ers, precision voltage references, and voltage regulators.
LOW DISTORTION, HIGH OUTPUT
DRIVE CAPABILITY
The LM7301 offers superior low-distortion performance, with
a total-harmonic-distortion-plus-noise of 0.06% at f = 10 kHz.
The advantage offered by the LM7301 is its low distortion
levels, even at high output current and low load resistance.
Typical Applications
HANDHELD REMOTE CONTROLS
The LM7301 offers outstanding specifications for applica-
tions requiring good speed/power trade-off. In applications
such as remote control operation, where high bandwidth and
low power consumption are needed. The LM7301 perfor-
mance can easily meet these requirements.
OPTICAL LINE ISOLATION FOR MODEMS
The combination of the low distortion and good load driving
capabilities of the LM7301 make it an excellent choice for
driving opto-coupler circuits to achieve line isolation for mo-
dems. This technique prevents telephone line noise from
coupling onto the modem signal. Superior isolation is
achieved by coupling the signal optically from the computer
modem to the telephone lines; however, this also requires a
low distortion at relatively high currents. Due to its low dis-
tortion at high output drive currents, the LM7301 fulfills this
need, in this and in other telecom applications.
REMOTE MICROPHONE IN
PERSONAL COMPUTERS
Remote microphones in Personal Computers often utilize a
microphone at the top of the monitor which must drive a long
cable in a high noise environment. One method often used to
reduce the nose is to lower the signal impedance, which
reduces the noise pickup. In this configuration, the amplifier
usually requires 30 db–40 db of gain, at bandwidths higher
than most low-power CMOS parts can achieve. The LM7301
offers the tiny package, higher bandwidths, and greater out-
put drive capability than other rail-to-rail input/output parts
can provide for this application.
2.5k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
Transport Media
95 Units/Rail
NSC Drawing
MF05A
M08A