1

µA, Rail-to-Rail I/O CMOS

OPERATIONAL AMPLIFIERS

FEATURES

q LOW SUPPLY CURRENT: 1

µA

q GAIN-BANDWIDTH: 70kHz

q UNITY-GAIN STABLE

q LOW INPUT BIAS CURRENT: 10pA (max)

q WIDE SUPPLY RANGE: 1.8V to 5.5V

q INPUT RANGE: 200mV Beyond Rails

q OUTPUT SWINGS TO 350mV OF RAILS

q OUTPUT DRIVE CURRENT: 8mA

q OPEN-LOOP GAIN: 90dB

q MicroPACKAGES: SC70, SOT23-5, SOT23-8

APPLICATIONS

q BATTERY PACKS AND POWER SUPPLIES

q PORTABLE PHONES, PAGERS, AND CAMERAS

q SOLAR-POWERED SYSTEMS

q SMOKE, GAS, AND FIRE DETECTION SYSTEMS

q REMOTE SENSORS

q PCMCIA CARDS

q DRIVING ANALOG-TO-DIGITAL (A/D) CONVERTERS

q MicroPOWER FILTERS

DESCRIPTION

The OPA349 and OPA2349 are ultra-low power operational

amplifiers that provide 70kHz bandwidth with only 1

µA quies-

cent current. These rail-to-rail input and output amplifiers are

specifically designed for battery-powered applications. The

input common-mode voltage range extends 200mV beyond

the power-supply rails and the output swings to within 350mV

of the rails, maintaining wide dynamic range. Unlike some

micropower op amps, these parts are unity-gain stable and

require no external compensation to achieve wide band-

width. The OPA349 features a low input bias current that

allows the use of large source and feedback resistors.

The OPA349 can be operated with power supplies from 1.8V

to 5.5V with little change in performance, ensuring continuing

superior performance even in low battery situations.

The OPA349 comes in miniature SOT23-5, SC70, and SO-8

surface-mount packages. The OPA2349 dual is available in

SOT23-8, and SO-8 surface-mount packages. These tiny

packages are ideal for use in high-density applications, such

as PCMCIA cards, battery packs, and portable instruments.

The OPA349 is specified for 0

°C to +70°C. The OPA2349 is

specified for –40

°C to +70°C.

OPA349

OPA2349

SBOS121B – JUNE 2000 – REVISED JANUARY 2004

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 2000-2004, Texas Instruments Incorporated

FEATURES

PRODUCT

1

µA, 5.5kHz, Rail-To-Rail

TLV240x

1

µA, 5.5kHz, Rail-To-Rail

TLV224x

7

µA, 160kHz, Rail-To-Rail, 2.7V to 16V Supply

TLV238x

7

µA, 160kHz, Rail-To-Rail, Micro Power

TLV27Lx

20

µA, 500kHz, Rail-To-Rail, 1.8V Micro Power

TLV276x

20

µA, 350kHz, Rail-To-Rail, Micro Power

OPAx347

45

µA, 1MHz, Rail-To-Rail, 2.1V to 5.5V Supply

OPAx348

OPAx349 RELATED PRODUCTS

OPA349

OPA2

349

OPEN-LOOP GAIN AND PHASE vs FREQUENCY

Frequency (Hz)

100

90

80

70

60

50

40

30

20

10

0

0

45

90

135

180

1

10

100

1k

10k

100k

1M

0.1

Gain

Phase

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