LM611 Operational Amplifier and Adjustable Reference
August 2000
LM611
Operational Amplifier and Adjustable Reference
General Description
The LM611 consists of a single-supply op-amp and a pro-
grammable voltage reference in one space saving 8-pin
package. The op-amp out-performs most single-supply
op-amps by providing higher speed and bandwidth along
with low supply current. This device was specifically de-
signed to lower cost and board space requirements in trans-
ducer, test, measurement and data acquisition systems.
Combining a stable voltage reference with a wide output
swing op-amp makes the LM611 ideal for single supply
transducers, signal conditioning and bridge driving where
large common-mode signals are common. The voltage refer-
ence consists of a reliable band-gap design that maintains
low dynamic output impedance (1鈩?typical), excellent initial
tolerance (0.6%), and the ability to be programmed from
1.2V to 6.3V via two external resistors. The voltage refer-
ence is very stable even when driving large capacitive loads,
as are commonly encountered in CMOS data acquisition
systems.
As a member of National鈥檚 Super-Block
鈩?/div>
family, the LM611
is a space-saving monolithic alternative to a multi-chip solu-
tion, offering a high level of integration without sacrificing
performance.
Features
OP AMP
n
Low operating current: 300 碌A(chǔ) (op amp)
n
Wide supply voltage range: 4V to 36V
n
Wide common-mode range: V
鈭?/div>
to (V
+
鈭?.8V)
n
Wide differential input voltage:
鹵
36V
n
Available in low cost 8-pin DIP
n
Available in plastic package rated for Military
Temperature Range Operation
REFERENCE
n
Adjustable output voltage: 1.2V to 6.3V
n
Tight initial tolerance available:
鹵
0.6%
n
Wide operating current range: 17 碌A(chǔ) to 20 mA
n
Reference floats above ground
n
Tolerant of load capacitance
Applications
n
n
n
n
Transducer bridge driver
Process and Mass Flow Control systems
Power supply voltage monitor
Buffered voltage references for A/D鈥檚
Connection Diagrams
DS009221-1
DS009221-2
Super-Block
鈩?/div>
is a trademark of National Semiconductor Corporation.
漏 2000 National Semiconductor Corporation
DS009221
www.national.com
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