NSC LM611AIN Datasheet

LM611
Operational Amplifier and Adjustable Reference

LM611 Operational Amplifier and Adjustable Reference

August 2000

General Description

The LM611 consists of a single-supply op-amp and a pro­grammable 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 de­signed to lower cost and board space requirements in trans­ducer, 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-modesignalsare common. The voltage refer­ence consists of a reliable band-gap design that maintains
low dynamic output impedance (1Ω typical), excellent initial
tolerance (0.6%), and the ability to be programmed from

1.2V to 6.3V via two external resistors. The voltage refer­ence 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
is a space-saving monolithic alternative to a multi-chip solu­tion, offering a high level of integration without sacrificing
performance.

™

family, the LM611

Connection Diagrams

Features

OP AMP

n Low operating current: 300 µA (op amp)
n Wide supply voltage range: 4V to 36V
n Wide common-mode range: V
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: 1.2V to 6.3V
n Tight initial tolerance available:
n Wide operating current range: 17 µA to 20 mA
n Reference floats above ground
n Tolerant of load capacitance

−

to (V+−1.8V)

±

36V

±

0.6%

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

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Super-Block™is a trademark of National Semiconductor Corporation.

© 2000 National Semiconductor Corporation DS009221 www.national.com

Absolute Maximum Ratings (Note 1)

LM611

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Voltage on Any Pins Except V

(referred to V−pin) 36V (Max)
(Note 2) −0.3V (Min)

R

Thermal Resistance, Junction-to-Ambient (Note 3)

N Package 100˚C/W
M Package 150˚C/W

Soldering Information Soldering (10 seconds)

N Package 260˚C
M Package 220˚C

ESD Tolerance (Note 4)

Current through Any Input Pin and

Pin

V

R

Differential Input Voltage

Military and Industrial
Commercial

Storage Temperature Range −65˚C≤T

±

20 mA

±

36V

±

32V

≤+150˚C

J

Operating Temperature Range

LM611AI, LM611I, LM611BI −40˚C≤TJ≤+85˚C
LM611AM, LM611M −55˚C≤T
LM611C 0˚C≤T

Maximum Junction Temperature 150˚C

Electrical Characteristics

These specifications apply for V−= GND = 0V, V+= 5V, VCM=V
unless otherwise specified. Limits in standard typeface are for TJ= 25˚C; limits in boldface type apply over the Operating

Temperature Range.

Symbol Parameter Conditions Typical LM611AI LM611I Units

I

S

V

S

Total Supply Current R

Supply Voltage Range 2.2 2.8 2.8 V min

=∞, 210 300 350 µA max

LOAD

+

4V ≤ V

≤ 36V (32V for LM611C) 221 320 370 µA max

OPERATIONAL AMPLIFIER

V

OS1

V

OS2

VOSOver Supply 4V ≤ V+≤ 36V 1.5 3.5 5.0 mV max

+

VOSOver V

CM

(4V ≤ V
VCM= 0V through VCM= 1.0 3.5 5.0 mV max

≤ 32V for LM611C) 2.0 6.0 7.0 mV max

+

(V

− 1.8V), V+= 30V, V−=0V 1.5 6.0 7.0 mV max

Average VOSDrift (Note 6)

I

B

I

OS

Input Bias Current 10 25 35 nA max

Input Offset Current 0.2 4 4 nA max

Average Offset Drift
Current

= 2.5V, IR= 100 µA, FEEDBACK pin shorted to GND,

OUT

LM611M

LM611AM LM611BI

(Note 5) Limits LM611C

(Note 6) Limits

(Note 6)

2.9 3 3 V min
46 36 32 V max

43 36 32 V max

15

11 30 40 nA max

0.3 5 5 nA max

4 pA/˚C

±

1kV

≤+125˚C

J

≤70˚C

J

µV/˚C

max

R

IN

Input Resistance Differential 1800 MΩ

Common-Mode 3800 MΩ

C

IN

e

n

Input Capacitance Common-Mode 5.7 pF
Voltage Noise f = 100 Hz,

74

Input Referred

I

n

Current Noise f = 100 Hz,

58

Input Referred

CMRR Common-Mode V+= 30V, 0V ≤ VCM≤ (V+− 1.8V) 95 80 75 dB min

Rejection-Ratio CMRR = 20 log (∆V

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/∆VOS) 90 75 70 dB min

CM

Electrical Characteristics (Continued)

These specifications apply for V−= GND = 0V, V+= 5V, VCM=V
unless otherwise specified. Limits in standard typeface are for TJ= 25˚C; limits in boldface type apply over the Operating

Temperature Range.

Symbol Parameter Conditions Typical LM611AI LM611I Units

OPERATIONAL AMPLIFIER

PSRR Power Supply 4V ≤ V

Rejection-Ratio PSRR = 20 log (∆V

A

V

Open Loop RL=10kΩto GND, V+= 30V, 500 100 94 V/mV
Voltage Gain 5V ≤ V

SR Slew Rate V

GBW Gain Bandwidth C

V

O1

Output Voltage RL=10kΩto GND V+− 1.4 V+− 1.7 V+− 1.8 V min
Swing High V

V

O2

Output Voltage RL=10kΩto V
Swing Low V

I

OUT

Output Source V
Current V

I

SINK

Output Sink V
Current V

I

SHORT

Short Circuit Current V

+

≤ 30V, VCM=V+/2, 110 80 75 dB min

≤ 25V 50 40 40 min

OUT

+

= 30V (Note 7) 0.70 0.55 0.50 V/µs

= 50 pF 0.80 MHz

L

+

= 36V (32V for LM611C) V+− 1.6 V+− 1.9 V+− 1.9 V min

+

= 36V (32V for LM611C) V−+ 0.9 V−+ 1.0 V−+ 1.0 V max

= 2.5V, V

OUT

= −0.3V 15 13 13 mA min

−IN

= 1.6V, V

OUT

= 0.3V 98 8mA min

−IN

= 0V, V

OUT

V

= 2V, Source 40 60 60 mA max

−IN

V

= 5V, V

OUT

V

= 3V, Sink 32 80 90 mA max

−IN

+

/∆VOS) 100 75 70 dB min

+

= 0V, 25 20 16 mA min

+IN

= 0V, 17 14 13 mA min

+IN

= 3V, 30 50 50 mA max

+IN

= 2V, 30 60 70 mA max

+IN

VOLTAGE REFERENCE

V

R

Reference Voltage (Note 8) 1.244 1.2365 1.2191 V min

Average Temperature

(Note 9)

Drift

= 2.5V, IR= 100 µA, FEEDBACK pin shorted to GND,

OUT

LM611M

LM611AM LM611BI

(Note 5) Limits LM611C

(Note 6) Limits

(Note 6)

0.65 0.45 0.45

0.50

V−+ 0.8 V−+ 0.9 V−+ 0.95 V max

1.2515 1.2689 V max

±

(

0.6%) (±2.0%)

10 80 150

PPM/˚C

LM611

max

Hysteresis Hyst = (Vro' − Vro)/∆TJ(Note 10)

VRChange V
with Current 0.1 1.1 1.1 mV max

V
(Note 11) 2.0 5.5 5.5 mV max

R Resistance ∆V

∆V
VRChange with V
High V

RO

(5.06V between Anode and

FEEDBACK)
VRChange with V

+

V

Change (V+= 32V for LM611C) 0.1 1.3 1.3 mV max

V

R(100 µA)−VR(17 µA)

R(10 mA)−VR(100 µA)

R(10→0.1 mA)
R(100→17 µA)

R(Vro = Vr)−VR(Vro = 6.3V)

R(V+ = 5V)−VR(V+ = 36V)

R(V+ = 5V)−VR(V+ = 3V)

/9.9 mA 0.2 0.56 0.56 Ω max
/83 µA 0.6 13 13 Ω max

3.2 µV/˚C

0.05 1 1 mV max

1.5 5 5 mV max

2.5 7 7 mV max

2.8 10 10 mV max

0.1 1.2 1.2 mV max

0.01 1 1 mV max

0.01 1.5 1.5 mV max

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Electrical Characteristics (Continued)

LM611

These specifications apply for V−= GND = 0V, V+= 5V, VCM=V
unless otherwise specified. Limits in standard typeface are for TJ= 25˚C; limits in boldface type apply over the Operating

Temperature Range.

Symbol Parameter Conditions Typical LM611AI LM611I Units

VOLTAGE REFERENCE

VRChange with V+=V+max, ∆VR=V
V

I

FB

FEEDBACK Bias IFB;V

Change (@V

ANODE

=V−= GND) − V

ANODE

@

(

V

=V+− 1.0V) 3.3 3.0 3.0 mV max

ANODE

≤ VFB≤ 5.06V 22 35 50 nA max

ANODE

R

Current 29 40 55 nA max

e

n

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de­vice beyond its rated operating conditions.

Note 2: More accurately, it is excessive current flow, with resulting excess heating, that limits the voltages on all pins. When any pin is pulled a diode drop below

−

V

, a parasitic NPN transistor turns ON. No latch-up will occur as long as the current through that pin remains below the Maximum Rating. Operation is undefined

and unpredictable when any parasitic diode or transistor is conducting.
Note 3: Junction temperature may be calculated using T

soldered to copper-clad board with dissipation from one op amp or reference output transistor, nominal θ
age.

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 5: Typical values in standard typeface are for T

most likely parametric norm.

Note 6: All limits are guaranteed at room temperature (standard type face) or at operating temperature extremes (bold face type).
Note 7: Slew rate is measured with op amp in a voltage follower configuration. For rising slew rate, the input voltage is driven from 5V to 25V,and the output voltage

transition is sampled at 10V and 20V. For falling slew rate, the input voltage is driven from 25V to 5V, and output voltage transition is sampled at 20V and 10V.

Note 8: V
Note 9: Average reference drift is calculated from the measurement of the reference voltage at 25˚C and at the temperature extremes. The drift, in ppm/˚C, is

6

10

∆VR/(V

•

is guaranteed by design and sample testing.
Note 10: Hysteresis is the change in V

hysteresis to the typical value, its junction temperature should be cycled in the following pattern, spiraling in toward 25˚C: 25˚C, 85˚C, −40˚C, 70˚C, 0˚C, 25˚C.

Note 11: Low contact resistance is required for accurate measurement.
Note 12: Military RETS 611AMX electrical test specification is available on request. The LM611AMJ/883 can also be procured as a Standard Military Drawing.

VRNoise 10 Hz to 10,000 Hz, VRO=V

J=TA+PDθJA

= 25˚C; values in boldface type apply for the full operating temperature range. These values represent the

J

is the cathode-feedback voltage, nominally 1.244V.

R

∆TJ), where ∆VRis the lowest value subtracted from the highest, V

•

R[25˚C]

caused by a change in TJ, after the reference has been “dehysterized”. To dehysterize the reference; that is minimize the

R

. The given thermal resistance is worst-case for packages in sockets in still air.For packages

= 2.5V, IR= 100 µA, FEEDBACK pin shorted to GND,

OUT

LM611M

LM611AM LM611BI

(Note 5) Limits LM611C

(Note 6) Limits

(Note 6)

R

R

R[25˚C]

0.7 1.5 1.6 mV max

30 µV

is 90˚C/W for the N package and 135˚C/W for the M pack-

JA

is the value at 25˚C, and ∆TJis the temperature range. This parameter

RMS

Typical Performance Characteristics (Reference) T

0V, unless otherwise noted

Reference Voltage vs Temp
on 5 Representative Units

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Reference Voltage Drift

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= 25˚C, FEEDBACK pin shorted to V−=

J

Accelerated Reference
Voltage Drift vs Time

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Typical Performance Characteristics (Reference) T

= 0V, unless otherwise noted (Continued)

= 25˚C, FEEDBACK pin shorted to V

J

LM611

−

Reference Voltage vs
Current and Temperature

Reference Voltage vs
Reference Current

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Reference Voltage vs
Current and Temperature

Reference AC
Stability Range

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Reference Voltage vs
Reference Current

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Feedback Current vs
Feedback-to-Anode Voltage

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Feedback Current vs
Feedback-to-Anode Voltage

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Reference Noise Voltage
vs Frequency

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Reference Small-Signal
Resistance vs Frequency

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