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

Low operating current:

300 µA (op amp)

Wide supply voltage range:

4V to 36V

Wide common-mode range:

to (V

-1.8V)

Wide differential input voltage:

36V

Available in low cost 8-pin DIP

Available in plastic package rated for Military
Temperature Range Operation

REFERENCE

Adjustable output voltage:

1.2V to 6.3V

Tight initial tolerance available:

0.6%

Wide operating current range:

17 µA to 20 mA

Reference floats above ground

Tolerant of load capacitance

Applications

Transducer bridge driver

Process and Mass Flow Control systems

Power supply voltage monitor

Buffered voltage references for A/D's

Connection Diagrams

Super-Block

is a trademark of National Semiconductor Corporation.

DS009221-1

DS009221-2

August 2000

LM61

Operational

Amplifier

and

Adjustable

Reference

DS009221

www.national.com

Absolute Maximum Ratings

(Note 1)

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)

Current through Any Input Pin and

20 mA

Differential Input Voltage

Military and Industrial

36V

Commercial

32V

Storage Temperature Range

-65°C

+150°C

Maximum Junction Temperature

150°C

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)

1 kV

Operating Temperature Range

LM611AI, LM611I, LM611BI

-40°C

+85°C

LM611AM, LM611M

-55°C

+125°C

LM611C

0°C

70°C

Electrical Characteristics

These specifications apply for V

= GND = 0V, V

= 5V, V

= V

OUT

= 2.5V, I

= 100 µA, FEEDBACK pin shorted to GND,

unless otherwise specified. Limits in standard typeface are for T

= 25°C; limits in boldface type apply over the Operating

Temperature Range.

LM611M

LM611AM

LM611BI

Symbol

Parameter

Conditions

Typical

LM611AI

LM611I

Units

(Note 5)

Limits

LM611C

(Note 6)

Limits

(Note 6)

Total Supply Current

LOAD

210

300

350

µA max

36V (32V for LM611C)

221

320

370

µA max

Supply Voltage Range

2.2

2.8

V min

2.9

V min

V max

OPERATIONAL AMPLIFIER

OS1

Over Supply

36V

1.5

3.5

5.0

mV max

(4V

32V for LM611C)

2.0

6.0

7.0

mV max

OS2

Over V

= 0V through V

1.0

3.5

5.0

mV max

- 1.8V), V

= 30V, V

= 0V

1.5

6.0

7.0

mV max

Average V

Drift

(Note 6)

µV/°C

max

Input Bias Current

nA max

Input Offset Current

0.2

nA max

0.3

nA max

Average Offset Drift
Current

pA/°C

Input Resistance

Differential

1800

Common-Mode

3800

Input Capacitance

Common-Mode

5.7

Voltage Noise

f = 100 Hz,
Input Referred

Current Noise

f = 100 Hz,
Input Referred

CMRR

Common-Mode

= 30V, 0V

- 1.8V)

dB min

Rejection-Ratio

CMRR = 20 log (

)

dB min

LM61

www.national.com

Electrical Characteristics

(Continued)

These specifications apply for V

= GND = 0V, V

= 5V, V

= V

OUT

= 2.5V, I

= 100 µA, FEEDBACK pin shorted to GND,

unless otherwise specified. Limits in standard typeface are for T

= 25°C; limits in boldface type apply over the Operating

Temperature Range.

LM611M

LM611AM

LM611BI

Symbol

Parameter

Conditions

Typical

LM611AI

LM611I

Units

(Note 5)

Limits

LM611C

(Note 6)

Limits

(Note 6)

OPERATIONAL AMPLIFIER

PSRR

Power Supply

30V, V

= V

/2,

110

dB min

Rejection-Ratio

PSRR = 20 log (

)

100

dB min

Open Loop

= 10 k

to GND, V

= 30V,

500

100

V/mV

Voltage Gain

OUT

25V

min

Slew Rate

= 30V (Note 7)

0.70

0.55

0.50

V/µs

0.65

0.45

GBW

Gain Bandwidth

= 50 pF

0.80

MHz

0.50

Output Voltage

= 10 k

to GND

- 1.4

- 1.7

- 1.8

V min

Swing High

= 36V (32V for LM611C)

- 1.6

- 1.9

V min

Output Voltage

= 10 k

to V

+ 0.8

+ 0.9

+ 0.95

V max

Swing Low

= 36V (32V for LM611C)

+ 0.9

+ 1.0

V max

OUT

Output Source

OUT

= 2.5V, V

+IN

= 0V,

mA min

Current

-IN

= -0.3V

mA min

SINK

Output Sink

OUT

= 1.6V, V

+IN

= 0V,

mA min

Current

-IN

= 0.3V

mA min

SHORT

Short Circuit Current

OUT

= 0V, V

+IN

= 3V,

mA max

-IN

= 2V, Source

mA max

OUT

= 5V, V

+IN

= 2V,

mA max

-IN

= 3V, Sink

mA max

VOLTAGE REFERENCE

Reference Voltage

(Note 8)

1.244

1.2365

1.2191

V min

1.2515

1.2689

V max

(

0.6%)

(

2.0%)

Average Temperature
Drift

(Note 9)

150

PPM/°C

max

Hysteresis

Hyst = (Vro' - Vro)/

(Note 10)

3.2

µV/°C

Change

R(100 µA)

- V

R(17 µA)

0.05

mV max

with Current

0.1

1.1

mV max

R(10 mA)

- V

R(100 µA)

1.5

mV max

(Note 11)

2.0

5.5

mV max

Resistance

R(10

0.1 mA)

/9.9 mA

0.2

0.56

max

R(100

17 µA)

/83 µA

0.6

max

Change with

R(Vro = Vr)

- V

R(Vro = 6.3V)

2.5

mV max

High V

(5.06V between Anode and
FEEDBACK)

2.8

mV max

Change with

R(V+ = 5V)

- V

R(V+ = 36V)

0.1

1.2

mV max

Change

= 32V for LM611C)

0.1

1.3

mV max

R(V+ = 5V)

- V

R(V+ = 3V)

0.01

mV max

0.01

1.5

mV max

LM61

www.national.com

Electrical Characteristics

(Continued)

These specifications apply for V

= GND = 0V, V

= 5V, V

= V

OUT

= 2.5V, I

= 100 µA, FEEDBACK pin shorted to GND,

unless otherwise specified. Limits in standard typeface are for T

= 25°C; limits in boldface type apply over the Operating

Temperature Range.

LM611M

LM611AM

LM611BI

Symbol

Parameter

Conditions

Typical

LM611AI

LM611I

Units

(Note 5)

Limits

LM611C

(Note 6)

Limits

(Note 6)

VOLTAGE REFERENCE

Change with

= V

max,

= V

ANODE

Change

(

ANODE

= V

= GND) - V

0.7

1.5

1.6

mV max

(

ANODE

= V

- 1.0V)

3.3

3.0

mV max

FEEDBACK Bias

; V

ANODE

5.06V

nA max

Current

nA max

Noise

10 Hz to 10,000 Hz, V

= V

µV

RMS

Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice 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

= T

+ P

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

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

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

age.

Note 4: Human body model, 100 pF discharged through a 1.5 k

resistor.

Note 5: Typical values in standard typeface are for T

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

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

is the cathode-feedback voltage, nominally 1.244V.

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
10

/(V

R[25°C]

), where

is the lowest value subtracted from the highest, V

R[25°C]

is the value at 25°C, and

is the temperature range. This parameter

is guaranteed by design and sample testing.

Note 10: Hysteresis is the change in V

caused by a change in T

, after the reference has been "dehysterized". To dehysterize the reference; that is minimize the

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.

Typical Performance Characteristics (Reference)

= 25°C, FEEDBACK pin shorted to V

0V, unless otherwise noted

Reference Voltage vs Temp
on 5 Representative Units

DS009221-33

Reference Voltage Drift

DS009221-34

Accelerated Reference
Voltage Drift vs Time

DS009221-35

LM61

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LM611AMJ/883