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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
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’s Super-Block
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:
n
Wide supply voltage range:
n
Wide common-mode range:
n
Wide differential input voltage:
n
Available in low cost 8-pin DIP
n
Available in plastic package rated for Military
Temperature Range Operation
REFERENCE
n
Adjustable output voltage:
n
Tight initial tolerance available:
n
Wide operating current range:
n
Reference floats above ground
n
Tolerant of load capacitance
300 μA (op amp)
4V to 36V
V
to (V
+
1.8V)
±
36V
1.2V to 6.3V
±
0.6%
17 μA to 20 mA
Applications
n
Transducer bridge driver
n
Process and Mass Flow Control systems
n
Power supply voltage monitor
n
Buffered voltage references for A/D’s
Connection Diagrams
Super-Block
is a trademark of National Semiconductor Corporation.
DS009221-1
DS009221-2
May 1998
L
1999 National Semiconductor Corporation
DS009221
www.national.com