LT1491ACSPBF Linear Technology Corporation, LT1491ACSPBF Datasheet

LT1491ACSPBF

Manufacturer Part Number

LT1491ACSPBF

Description

SOP14

Manufacturer

Linear Technology Corporation

Datasheets

1.LT1491ACSPBF.pdf (18 pages)

2.LT1490CS8PBF.pdf (12 pages)

Specifications of LT1491ACSPBF

Date_code

08+

Current page: 1 of 18
Download datasheet (229Kb)

FEATURES

APPLICATIONS

TYPICAL APPLICATION

Low Input Offset Voltage: 500μV Max

Output Swings to 10mV Max from V

Rail-to-Rail Input and Output

Micropower: 50μA/Amplifier Max

Over-The-Top

44V Above V

Specified on 3V, 5V and ±15V Supplies

High Output Current: 20mA

Output Drives 10,000pF with Output Compensation

Reverse Battery Protection to 18V

No Supply Sequencing Problems

High Voltage Gain: 1500V/mV

High CMRR: 98dB

No Phase Reversal

Gain Bandwidth Product: 200kHz

Tiny 3mm × 3mm × 0.8mm DFN Package

Battery- or Solar-Powered Systems

Supply Current Sensing

Battery Monitoring

Micropower Active Filters

4mA to 20mA Transmitters

Portable Instrumentation

Sensor Conditioning

–

, Independent of V

Input Common Mode Range Extends

CHARGER

VOLTAGE

BATT

LOAD

0.2Ω

BATT

)(R

–

OUT

)(GAIN)

BATT

R A

= 12V

GAIN

OUT

AMPS

1/4 LT1491A

–

1/4 LT1491A

–

Battery Monitor

Input and Output Op Amps

2N3904

DESCRIPTION

The LT

low input offset voltage of 500μV max. The LT1490A/LT1491A

operate on all single and split supplies with a total voltage of

2V to 44V, drawing only 40μA of quiescent current per ampli-

fier. These amplifiers are reverse supply protected; they draw

virtually no current for reverse supply up to 18V. The input

range of the LT1490A/LT1491A includes both supplies and

the output swings to both supplies. Unlike most micropower

op amps, the LT1490A/LT1491A can drive heavy loads; their

rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are

unity-gain stable and drive all capacitive loads up to 10,000pF

when optional 0.22μF and 150Ω compensation is used.

The LT1490A/LT1491A have a unique input stage that oper-

ates and remains high impedance when above the positive

supply. The inputs take 44V both differential and common

mode even when operating on a 3V supply. Built-in resistors

protect the inputs for faults below the negative supply up to

15V. There is no phase reversal of the output for inputs 15V

below V

The LT1490A dual op amp is available in the 8-pin MSOP , PDIP

and SO packages. For space limited applications LT1490A is

available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless

package (DFN). The quad LT1491A is available in the 14-pin

SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.

L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5825228.

2N3904

S1 = OPEN, GAIN = 1

S1 = CLOSED, GAIN = 10

Dual/Quad Over-The-Top

10k

Micropower Rail-to-Rail

10k

1490A/LT1491A are dual and quad op amps with a

–

or 44V above V

1/4 LT1491A

LOGIC HIGH (5V) = CHARGING

LOGIC LOW (0V) = DISCHARGING

1/4 LT1491A

–

90.9k

= R

= 5V, 0V

LT1490A/LT1491A

–

, independent of V

1490A TA01

LOGIC

OUT

14901afd

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