NSC LMP2231, LMP2231BMFX Datasheet

February 7, 2008

LMP2231 Single
Micropower, 1.8V, Precision Operational Amplifier with
CMOS Inputs

General Description

The LMP2231 is a single micropower precision amplifier de­signed for battery powered applications. The 1.8V to 5.0V
guaranteed supply voltage range and quiescent power con­sumption of only 18 μW extend the battery life in portable
battery operated systems. The LMP2231 is part of the
LMP® precision amplifier family. The high impedance CMOS
input makes it ideal for instrumentation and other sensor in­terface applications.

The LMP2231 has a maximum offset of 150 µV and maximum
offset voltage drift of only 0.4 µV/°C along with low bias cur­rent of only ±20 fA. These precise specifications make the
LMP2231 a great choice for maintaining system accuracy and
long term stability.

The LMP2231 has a rail-to-rail output that swings 15 mV from
the supply voltage, which increases system dynamic range.
The common mode input voltage range extends 200 mV be­low the negative supply, thus the LMP2231 is ideal for use in
single supply applications with ground sensing.

The LMP2231 is offered in 5-Pin SOT23 and 8-pin SOIC
packages.

The dual and quad versions of this product are also available.
The dual, LMP2232 is offered in 8-pin SOIC and MSOP. The
quad, LMP2234 is offered in 14-pin SOIC and TSSOP.

Features

(For VS = 5V, Typical unless otherwise noted)

■

Supply current 10 µA

■

Operating voltage range 1.6V to 5.5V

■

Low TCV

OS

±0.4 µV/°C (max)

■

V

OS

±150 µV (max)

■

Input bias current 20 fA

■

PSRR 120 dB

■

CMRR 97 dB

■

Open loop gain 120 dB

■

Gain bandwidth product 130 kHz

■

Slew rate 58 V/ms

■

Input voltage noise, f = 1 kHz 60 nV/√Hz

■

Temperature range –40°C to 125°C

Applications

■

Precision instrumentation amplifiers

■

Battery powered medical instrumentation

■

High Impedance Sensors

■

Strain gauge bridge amplifier

■

Thermocouple amplifiers

Typical Application

30033874

Strain Gauge Bridge Amplifier

LMP® is a registered trademark of National Semiconductor Corporation.

© 2008 National Semiconductor Corporation 300338 www.national.com

LMP2231 Single Micropower, 1.8V, Precision, Operational Amplifier with CMOS Inputs

Absolute Maximum Ratings (Note 1)

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

ESD Tolerance (Note 2)
Human Body Model 2000V
Machine Model 100V
Differential Input Voltage ±300 mV
Supply Voltage (VS = V+ - V–)

6V
Voltage on Input/Output Pins V+ + 0.3V, V– – 0.3V

Storage Temperature Range −65°C to 150°C

Junction Temperature (Note 3) 150°C
Mounting Temperature
Infrared or Convection (20 sec.) +235°C

Operating Ratings (Note 1)

Operating Temperature Range (Note 3) −40°C to 125°C
Supply Voltage (VS = V+ - V−)

1.6V to 5.5V

Package Thermal Resistance (θJA) (Note 3)

5-Pin SOT23 160.6 °C/W
8-Pin SOIC 116.2 °C/W

5V DC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for T

A

= 25°C,

V+ = 5V, V− = 0V, V

CM

= VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

V

OS

Input Offset Voltage ±10 ±150

±230

μV

TCV

OS

Input Offset Voltage Drift LMP2231A ±0.3 ±0.4

μV/°C

LMP2231B ±0.3 ±2.5

I

BIAS

Input Bias Current 0.02 ±1

±50

pA

I

OS

Input Offset Current 5 fA

CMRR Common Mode Rejection Ratio

0V ≤ VCM ≤ 4V

81

80

97

dB

PSRR Power Supply Rejection Ratio

1.6V ≤ V+ ≤ 5.5V
V− = 0V, VCM = 0V

83

83

120

dB

CMVR Common Mode Voltage Range

CMRR ≥ 80 dB
CMRR ≥ 79 dB

−0.2

−0.2

4.2

4.2

V

A

VOL

Large Signal Voltage Gain VO = 0.3V to 4.7V

RL = 10 kΩ to V+/2

110

108

120

dB

V

O

Output Swing High

RL = 10 kΩ to V+/2
VIN(diff) = 100 mV

17 50

50

mV

from either

rail

Output Swing Low

RL = 10 kΩ to V+/2
VIN(diff) = −100 mV

17 50

50

I

O

Output Current (Note 7) Sourcing, VO to V

–

VIN(diff) = 100 mV

27

19

30

mA

Sinking, VO to V

+

VIN(diff) = −100 mV

17

12

22

I

S

Supply Current 10 16

18

µA

5V AC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for T

A

= 25°C,

V+ = 5V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

GBW Gain-Bandwidth Product

CL = 20 pF, RL = 10 kΩ

130 kHz

SR Slew Rate AV = +1 Falling Edge 33

32

58

V/ms

Rising Edge 33

32

48

θ

m

Phase Margin

CL = 20 pF, RL = 10 kΩ

78 deg

G

m

Gain Margin

CL = 20 pF, RL = 10 kΩ

27

dB

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LMP2231 Single

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

e

n

Input-Referred Voltage Noise Density f = 1 kHz 60

nV/

Input-Referred Voltage Noise 0.1 Hz to 10 Hz 2.3

μV

PP

i

n

Input-Referred Current Noise f = 1 kHz 10

fA/

THD+N Total Harmonic Distortion + Noise

f = 100 Hz, RL = 10 kΩ

0.002

%

3.3V DC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for

TA = 25°C, V+ = 3.3V, V− = 0V, V

CM

= VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

V

OS

Input Offset Voltage ±10 ±160

±250

μV

TCV

OS

Input Offset Voltage Drift LMP2231A ±0.3 ±0.4

μV/°C

LMP2231B ±0.3 ±2.5

I

BIAS

Input Bias Current 0.02 ±1

±50

pA

I

OS

Input Offset Current 5 fA

CMRR Common Mode Rejection Ratio

0V ≤ VCM ≤ 2.3V

79

77

92

dB

PSRR Power Supply Rejection Ratio

1.6V ≤ V+ ≤ 5.5V
V− = 0V, VCM = 0V

83

83

120

dB

CMVR Common Mode Voltage Range

CMRR ≥ 78 dB
CMRR ≥ 77 dB

−0.2

−0.2

2.5

2.5

V

A

VOL

Large Signal Voltage Gain VO = 0.3V to 3V

RL = 10 kΩ to V+/2

108

107

120

dB

V

O

Output Swing High

RL = 10 kΩ to V+/2
VIN(diff) = 100 mV

14 50

50

mV

from either

rail

Output Swing Low

RL = 10 kΩ to V+/2
VIN(diff) = −100 mV

14 50

50

I

O

Output Current (Note 7) Sourcing, VO to V

–

VIN(diff) = 100 mV

11

8

14

mA

Sinking, VO to V

+

VIN(diff) = −100 mV

8

5

11

I

S

Supply Current 10 15

16

µA

3.3V AC Electrical Characteristics (Note 4) Unless otherwise is specified, all limits guaranteed for

TA = 25°C, V+ = 3.3V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

GBW Gain-Bandwidth Product

CL = 20 pF, RL = 10 kΩ

128 kHz

SR Slew Rate AV = +1, CL = 20 pF

RL = 10 kΩ

Falling Edge 58

V/ms

Rising Edge 48

θ

m

Phase Margin

CL = 20 pF, RL = 10 kΩ

76 deg

G

m

Gain Margin

CL = 20 pF, RL = 10 kΩ

26 dB

e

n

Input-Referred Voltage Noise Density f = 1 kHz 60

nV/

Input-Referred Voltage Noise 0.1 Hz to 10 Hz 2.4

μV

PP

i

n

Input-Referred Current Noise f = 1 kHz 10

fA/

THD+N Total Harmonic Distortion + Noise

f = 100 Hz, RL = 10 kΩ

0.003

%

3 www.national.com

LMP2231 Single

2.5V DC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for

TA = 25°C, V+ = 2.5V, V− = 0V, VCM = VO = V+/2, and RL > 1MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

V

OS

Input Offset Voltage ±10 ±190

±275

μV

TCV

OS

Input Offset Voltage Drift LMP2231A ±0.3 ±0.4

μV/°C

LMP2231B ±0.3 ±2.5

I

BIAS

Input Bias Current 0.02 ±1.0

±50

pA

I

OS

Input Offset Current 5 fA

CMRR Common Mode Rejection Ratio

0V ≤ VCM ≤ 1.5V

77

76

91

dB

PSRR Power Supply Rejection Ratio

1.6V ≤ V+ ≤ 5.5V
V− = 0V, VCM = 0V

83

83

120

dB

CMVR Common Mode Voltage Range

CMRR ≥ 77 dB
CMRR ≥ 76 dB

−0.2

−0.2

1.7

1.7

V

A

VOL

Large Signal Voltage Gain VO = 0.3V to 2.2V

RL = 10 kΩ to V+/2

104

104

120

dB

V

O

Output Swing High

RL = 10 kΩ to V+/2
VIN(diff) = 100 mV

12 50

50

mV

from either

rail

Output Swing Low

RL = 10 kΩ to V+/2
VIN (diff) = −100 mV

13 50

50

I

O

Output Current (Note 7) Sourcing, VO to V

−

VIN(diff) = 100 mV

5

4

8

mA

Sinking, VO to V

+

VIN(diff) = −100 mV

3.5

2.5

7

I

S

Supply Current 10 14

15

µA

2.5V AC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for

TA = 25°C, V+ = 2.5V, V− = 0V, VCM = VO = V+/2, and RL > 1MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

GBW Gain-Bandwidth Product

CL = 20 pF, RL = 10 kΩ

128 kHz

SR Slew Rate AV = +1, CL = 20 pF

RL = 10 kΩ

Falling Edge 58

V/ms

Rising Edge 48

θ

m

Phase Margin

CL = 20 pF, RL = 10 kΩ

74 deg

G

m

Gain Margin

CL = 20 pF, RL = 10 kΩ

26

dB

e

n

Input-Referred Voltage Noise Density f = 1 kHz 60

nV/

Input-Referred Voltage Noise 0.1 Hz to 10 Hz 2.5

μV

PP

i

n

Input-Referred Current Noise f = 1 kHz 10

fA/

THD+N Total Harmonic Distortion + Noise

f = 100 Hz, RL = 10 kΩ

0.005

%

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LMP2231 Single

1.8V DC Electrical Characteristics (Note 4) Unless otherwise specified, all limits guaranteed for

TA = 25°C, V+ = 1.8V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

V

OS

Input Offset Voltage ±10 ±230

±325

μV

TCV

OS

Input Offset Voltage Drift LMP2231A ±0.3 ±0.4

μV/°C

LMP2231B ±0.3 ±2.5

I

BIAS

Input Bias Current 0.02 ±1.0

±50

pA

I

OS

Input Offset Current 5

fA

CMRR Common Mode Rejection Ratio

0V ≤ VCM ≤ 0.8V

76

75

92

dB

PSRR Power Supply Rejection Ratio

1.6V ≤ V+ ≤ 5.5V
V− = 0V, VCM = 0V

83

83

120

dB

CMVR Common Mode Voltage Rang

CMRR ≥ 76 dB
CMRR ≥ 75 dB

−0.2

0

1.0

1.0

V

A

VOL

Large Signal Voltage Gain VO = 0.3V to 1.5V

RL = 10 kΩ to V+/2

103

103

120

dB

V

O

Output Swing High

RL = 10 kΩ to V+/2
VIN(diff) = 100 mV

12 50

50

mV

from either

rail

Output Swing Low

RL = 10 kΩ to V+/2
VIN(diff) = −100 mV

13 50

50

I

O

Output Current (Note 7) Sourcing, VO to V

−

VIN(diff) = 100 mV

2.5

2

5

mA

Sinking, VO to V

+

VIN(diff) = −100 mV

2

1.5

5

I

S

Supply Current 10 14

15

µA

1.8V AC Electrical Characteristics (Note 4) Unless otherwise is specified, all limits guaranteed for

TA = 25°C, V+ = 1.8V, V− = 0V, VCM = VO = V+/2, and RL > 1 MΩ. Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

GBW Gain-Bandwidth Product

CL = 20 pF, RL = 10 kΩ

127 kHz

SR Slew Rate AV = +1, CL = 20 pF

RL = 10 kΩ

Falling Edge 58

V/ms

Rising Edge 48

θ

m

Phase Margin

CL = 20 pF, RL = 10 kΩ

70 deg

G

m

Gain Margin

CL = 20 pF, RL = 10 kΩ

25

dB

e

n

Input-Referred Voltage Noise Density f = 1 kHz 60

nV/

Input-Referred Voltage Noise 0.1 Hz to 10 Hz 2.4

μV

PP

i

n

Input-Referred Current Noise f = 1 kHz 10

fA/

THD+N Total Harmonic Distortion + Noise

f = 100 Hz, RL = 10 kΩ

0.005 %

5 www.national.com

LMP2231 Single

Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur. Operating Ratings indicate conditions for which the device is intended to

be functional, but specific performance is not guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

Note 3: The maximum power dissipation is a function of T

J(MAX)

, θJA. The maximum allowable power dissipation at any ambient temperature is

PD = (T

J(MAX)

– TA)/ θJA. All numbers apply for packages soldered directly onto a PC Board.

Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating
of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ >
TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the device may be permanently degraded, either mechanically or electrically.

Note 5: Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and will also depend
on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 6: All limits are guaranteed by testing, statistical analysis or design.

Note 7: The short circuit test is a momentary open loop test.

Connection Diagrams

5-Pin SOT23

30033802

Top View

8-Pin SOIC

30033842

Top View

Ordering Information

Package Part Number Temperature

Range

Package Marking Transport Media NSC Drawing

5-Pin SOT23

LMP2231AMF

−40°C to 125°C

AL5A

1k Units Tape and Reel

MF05A

LMP2231AMFE 250 Units Tape and Reel

LMP2231AMFX 3k Units Tape and Reel

LMP2231BMF

AL5B

1k Units Tape and Reel

LMP2231BMFE 250 Units Tape and Reel

LMP2231BMFX 3k Units Tape and Reel

8-Pin SOIC

LMP2231AMA

LMP2231AMA

95 Units/Rail

M08A

LMP2231AMAE 250 Units Tape and Reel

LMP2231AMAX 2.5k Units Tape and Reel

LMP2231BMA

LMP2231BMA

95 Units/Rail

LMP2231BMAE 250 Units Tape and Reel

LMP2231BMAX 2.5k Units Tape and Reel

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LMP2231 Single