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LM611IM
Operational Amplifier and Adjustable Reference
LM611
Operational Amplifier and Adjustable Reference
General DescriptionThe LM611 consistsofa single-supply op-amp anda pro-
grammable voltage referencein one space saving 8-pin
package. The op-amp out-performs most single-supply op-
ampsby providing higher speed and bandwidth along with
low supply current. This device was specifically designedto
lower cost and board space requirementsin transducer, test,
measurement and data acquisition systems.
Combininga stable voltage reference witha wide output
swing op-amp makes the LM611 idealfor single supply
transducers, signal conditioning and bridge driving where
large common-mode signals are common. The voltage ref-
erence consistsofa reliable band-gap design that maintains
low dynamic output impedance (1Ω typical), excellent initial
tolerance (0.6%), and the abilitytobe programmed from
1.2Vto 6.3Vvia two external resistors. The voltage refer-
enceis very stable even when driving large capacitive loads, are commonly encounteredin CMOS data acquisition
systems.a memberof National’s Super-Block™ family,the LM611a space-saving monolithic alternativetoa multi-chip solu-
tion, offeringa high levelof integration without sacrificing
performance.
Features AMP Low operating current: 300µA(op amp) Wide supply voltage range: 4Vto 36V Wide common-mode range:V−to(V+ −1.8V) Wide differential input voltage: ±36V Availablein low cost 8-pin DIP Availablein plastic package ratedfor Military
Temperature Range Operation
REFERENCE Adjustable output voltage: 1.2Vto 6.3V Tight initial tolerance available: ±0.6% Wide operating current range: 17µAto20 mA Reference floats above ground Tolerantof load capacitance
Applications Transducer bridge driver Process and Mass Flow Control systems Power supply voltage monitor Buffered voltage referencesfor A/D’s
Connection DiagramsAugust 2000
LM61
Operational
Amplifier
and
Adjustable
Reference
