+

±

-2.5 V

+2.5 V

Copyright © 2016, Texas Instruments Incorporated

13

LM7301

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SNOS879I – AUGUST 1999 – REVISED MAY 2016

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Copyright © 1999–2016, Texas Instruments Incorporated

Feature Description (continued)

2 us/div)

200 µs/div)

7.2.3 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 (2.2 V to 30 V, ensured) 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 precision performance, even in such adverse supply conditions.

7.2.4 Specific Advantages of 5-Pin SOT-23 (TinyPak)

The obvious advantage of the 5-pin SOT-23, 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 lightweight system application.

Furthermore, the low profile can help in height limited designs, 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

placement. Because the tiny package is so small, it can fit on the board right where the operational amplifier

must be placed for optimal performance, unconstrained by the usual space limitations. This optimal placement of

the tiny package allows for many system enhancements that are not easily achieved with the constraints 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 pickup problem is often caused by long wires in the board layout going to or

from an operational amplifier. 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 pickup. An overall reduction of system

noise results.

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 operational amplifier eliminates this problem.

Additional space savings parts are available in tiny packages from Texas Instruments, including low-power

amplifiers, precision-voltage references, and voltage regulators.