National LMP2021MF, LMP2022MM, LMP2021MA, LMP2022MA Schematic [ru]

LMP2021/LMP2022
Zero Drift, Low Noise, EMI Hardened Amplifiers

LMP2021/LMP2022 Zero Drift, Low Noise, EMI Hardened Amplifiers

November 6, 2008

General Description

The LMP2021/LMP2022 are single and dual precision oper­ational amplifiers offering ultra low input offset voltage, near
zero input offset voltage drift, very low input voltage noise and
very high open loop gain. They are part of the LMP® precision
family and are ideal for instrumentation and sensor interfaces.

The LMP2021/LMP2022 have only 0.004 µV/°C of input offset
voltage drift, and 0.4 µV of input offset voltage. These at­tributes provide great precision in high accuracy applications.

The proprietary continuous correction circuitry guarantees
impressive CMRR and PSRR, removes the 1/f noise compo­nent, and eliminates the need for calibration in many circuits.

With only 260 nVPP (0.1 Hz to 10 Hz) of input voltage noise
and no 1/f noise component, the LMP2021/LMP2022 are suit­able for low frequency applications such as industrial preci­sion weigh scales. The low input bias current of 23 pA makes
these excellent choices for high source impedance circuits
such as non-invasive medical instrumentation as well as test
and measurement equipment. The extremely high open loop
gain of 160 dB drastically reduces gain error in high gain ap­plications. With ultra precision DC specifications and very low
noise, the LMP2021/LMP2022 are ideal for position sensors,
bridge sensors, pressure sensors, medical equipment and
other high accuracy applications with very low error budgets.

The LMP2021 is offered in 5-Pin SOT-23 and 8-Pin SOIC
packages. The LMP2022 is offered in 8-Pin MSOP and 8-Pin
SOIC packages.

Features

(Typical Values, TA = 25°C, VS = 5V)

Input offset voltage (typical) −0.4 µV

■

Input offset voltage (max) ±5 µV

■

Input offset voltage drift (typical) -0.004 µV/°C

■

Input offset voltage drift (max) ±0.02 µV/°C

■

Input voltage noise, AV = 1000 11 nV/√Hz

■

Open loop gain 160 dB

■

CMRR 139 dB

■

PSRR 130 dB

■

Supply voltage range 2.2V to 5.5V

■

Supply current (per amplifier) 1.1 mA

■

Input bias current ±25 pA

■

GBW 5 MHz

■

Slew rate 2.6 V/µs

■

Operating temperature range −40°C to 125°C

■

5-Pin SOT-23, 8-Pin MSOP and 8-Pin SOIC Packages

■

Applications

Precision instrumentation amplifiers

■

Battery powered instrumentation

■

Thermocouple amplifiers

■

Bridge amplifiers

■

Typical Application

Bridge Amplifier

The LMP2021/LMP2022 support systems with up to 24 bits of accuracy.

LMP® is a registered trademark of National Semiconductor Corporation.

© 2008 National Semiconductor Corporation 300149 www.national.com

30014972

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 200V

LMP2021/LMP2022

Charge Device Model 1000V
VIN Differential ±V

Supply Voltage (VS = V+ – V−)

Output Short-Circuit Duration to V+ or V

             (Note 3)

Storage Temperature Range −65°C to 150°C

−

6.0V

5s

Soldering Information
Infrared or Convection (20 sec) 235°C
Wave Soldering Lead Temperature

(10 sec) 260°C

Operating Ratings (Note 1)

Temperature Range −40°C to 125°C
Supply Voltage (VS = V+ – V–)

Package Thermal Resistance (θJA)

S

5-Pin SOT-23 164 °C/W
8-Pin SOIC (LMP2021) 106 °C/W
8-Pin SOIC (LMP2022) 106 °C/W
8-Pin MSOP 217 °C/W

Junction Temperature (Note 4) 150°C max

2.5V Electrical Characteristics (Note 5)

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 2.5V, V− = 0V, VCM = V+/2, RL >10 kΩ to V+/2. Bold­face limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 7)

V

OS

TCV

I

B

I

OS

CMRR Common Mode Rejection Ratio

CMVR Input Common-Mode Voltage Range

Input Offset Voltage –0.9 ±5

Input Offset Voltage Drift (Note 8) 0.001 ±0.02

OS

Input Bias Current ±23 ±100

Input Offset Current ±57 ±200

−0.2V ≤ VCM ≤ 1.7V
0V ≤ VCM ≤ 1.5V

Large Signal CMRR ≥ 105 dB

105

102

−0.2

Large Signal CMRR ≥ 102 dB

EMIRR Electro-Magnetic Interference

Rejection Ratio
(Note 9)

IN+
and
IN−

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 400 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 900 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 1800 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 2400 MHz

PSRR Power Supply Rejection Ratio

2.5V ≤ V+ ≤ 5.5V, VCM = 0

115

112

2.2V ≤ V+ ≤ 5.5V, VCM = 0

A

VOL

Large Signal Voltage Gain

RL = 10 kΩ to V+/2
V

= 0.5V to 2V

OUT

RL = 2 kΩ to V+/2
V

= 0.5V to 2V

OUT

110 130

124

119

120

115

0

40

48

67

79

Typ

(Note 6)

141

130

150

150

(Note 7)

2.2V to 5.5V

Max

±10

±300

±250

1.7

1.5

Units

μV

μV/°C

pA

pA

dB

V

dB

dB

dB

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LMP2021/LMP2022

Symbol Parameter Conditions Min

(Note 7)

V

OUT

Output Swing High

RL = 10 kΩ to V+/2

38 50

Typ

(Note 6)

Max

(Note 7)

Units

70

62 85

115

30 45

55

58 75

mV

from either

rail

Output Swing Low

RL = 2 kΩ to V+/2

RL = 10 kΩ to V+/2

RL = 2 kΩ to V+/2

95

I

OUT

I

S

SR Slew Rate (Note 10)

GBW Gain Bandwidth Product

G

M

Φ

M

C

IN

e

n

i

n

t

r

Linear Output Current Sourcing, V

Sinking, V

= 2V 30 50

OUT

= 0.5V 30 50

OUT

Supply Current Per Amplifier 0.95 1.10

1.37

2.5

5 MHz

10 dB

60 deg

Gain Margin

Phase Margin

AV = +1, CL = 20 pF, RL = 10 kΩ
VO = 2 V

PP

CL = 20 pF, RL = 10 kΩ

CL = 20 pF, RL = 10 kΩ

CL = 20 pF, RL = 10 kΩ

Input Capacitance Common Mode 12

Differential Mode 12

Input-Referred Voltage Noise
Density

f = 0.1 kHz or 10 kHz, AV = 1000 11

f = 0.1 kHz or 10 kHz, AV = 100 15

Input-Referred Voltage Noise 0.1 Hz to 10 Hz 260

0.01 Hz to 10 Hz 330

Input-Referred Current Noise f = 1 kHz 350

Recovery time

to 0.1%, RL = 10 kΩ, AV = −50,

V

= 1.25 VPP Step, Duration = 50 μs

OUT

50 µs

mA

mA

V/μs

pF

nV/

nV

fA/

CT Cross Talk LMP2022, f = 1 kHz 150 dB

PP

5V Electrical Characteristics (Note 5)

Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = V+/2, RL > 10 kΩ to V+/2. Boldface
limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 7)

V

OS

TCV

I

B

I

OS

CMRR Common Mode Rejection Ratio

CMVR Input Common-Mode Voltage Range

Input Offset Voltage −0.4 ±5

Input Offset Voltage Drift (Note 8) −0.004 ±0.02

OS

Input Bias Current ±25 ±100

Input Offset Current ±48 ±200

−0.2V ≤ VCM ≤ 4.2V
0V ≤ VCM ≤ 4.0V

Large Signal CMRR ≥ 120 dB

120

115

–0.2

Large Signal CMRR ≥ 115 dB

0

Typ

(Note 6)

139

4.2

Max

(Note 7)

±10

±300

±250

4.0

Units

μV

μV/°C

pA

pA

dB

V

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Symbol Parameter Conditions Min

EMIRR Electro-Magnetic Interference

Rejection Ratio
(Note 9)

LMP2021/LMP2022

IN+

and

IN−

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 400 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 900 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

f = 1800 MHz

V

= 100 mVP (−20 dBVP)

RF-PEAK

(Note 7)

58

64

72

82

Typ

(Note 6)

Max

(Note 7)

f = 2400 MHz

PSRR Power Supply Rejection Ratio

2.5V ≤ V+ ≤ 5.5V, VCM = 0

115

130

112

2.2V ≤ V+ ≤ 5.5V, VCM = 0

A

VOL

Large Signal Voltage Gain

RL = 10 kΩ to V+/2
V

= 0.5V to 4.5V

OUT

RL = 2 kΩ to V+/2
V

= 0.5V to 4.5V

OUT

V

OUT

Output Swing High

RL = 10 kΩ to V+/2

110 130

125

160

120

123

160

118

83 135

170

RL = 2 kΩ to V+/2

120 160

204

Output Swing Low

RL = 10 kΩ to V+/2

65 80

105

RL = 2 kΩ to V+/2

103 125

158

I

OUT

I

S

Linear Output Current Sourcing, V

Sinking, V

= 4.5V 30 50

OUT

= 0.5V 30 50

OUT

Supply Current Per Amplifier 1.1 1.25

1.57

SR Slew Rate (Note 10)

GBW Gain Bandwidth Product

G

M

Φ

M

C

IN

Gain Margin

Phase Margin

Input Capacitance Common Mode 12

AV = +1, CL = 20 pF, RL = 10 kΩ
VO = 2 V

PP

CL = 20 pF, RL = 10 kΩ

CL = 20 pF, RL = 10 kΩ

CL = 20 pF, RL = 10 kΩ

2.6

5 MHz

10 dB

60 deg

Differential Mode 12

e

n

Input-Referred Voltage Noise Density f = 0.1 kHz or 10 kHz, AV= 1000 11

f = 0.1 kHz or 10 kHz, AV= 100 15

Input-Referred Voltage Noise 0.1 Hz to 10 Hz Noise 260

0.01 Hz to 10 Hz Noise 330

i

n

t

r

Input-Referred Current Noise f = 1 kHz 350

Input Overload Recovery time

to 0.1%, RL = 10 kΩ, AV = −50,

V

= 2.5 VPP Step, Duration = 50 μs

OUT

50

CT Cross Talk LMP2022, f = 1 kHz 150 dB

Units

dB

dB

dB

mV

from

either rail

mA

mA

V/μs

pF

nV/

nV

PP

fA/

μs

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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device 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 the test conditions, see the Electrical Characteristics
Tables.

Note 2: Human Body Model per MIL-STD-883, Method 3015.7. Machine Model, per JESD22-A115-A. Field-Induced Charge-Device Model, per JESD22-C101­C.

Note 3: Package power dissipation should be observed.

Note 4: The maximum power dissipation is a function of T

PD = (T

Note 5: 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.

Note 6: 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 7: All limits are guaranteed by testing, statistical analysis or design.

Note 8: Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature change.

Note 9: The EMI Rejection Ratio is defined as EMIRR = 20Log ( V

Note 10: The number specified is the average of rising and falling slew rates and is measured at 90% to 10%.

- TA)/ θJA. All numbers apply for packages soldered directly onto a PC board.

J(MAX)

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

J(MAX)

/ΔVOS).

R

F-PEAK

Connection Diagrams

LMP2021/LMP2022

5-Pin SOT-23

Top View

30014902

8-Pin SOIC (LMP2021)

Top View

8-Pin SOIC/MSOP (LMP2022)

30014953

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

5-Pin SOT-23

8-Pin SOIC

8-Pin MSOP

LMP2021MF

AF5A

LMP2021MFX 3k Units Tape and Reel

LMP2021MA

LMP2021MAX 2.5k Units Tape and Reel

LMP2022MA

LMP2022MAX 2.5k Units Tape and Reel

LMP2021MA

LMP2022MA

LMP2022MM

AV5A

LMP2022MMX 3.5k Units Tape and Reel

1k Units Tape and Reel

95 Units/Rail

95 Units/Rail

1k Units Tape and Reel

30014903

MF05ALMP2021MFE 250 Units Tape and Reel

M08A

MUA08ALMP2022MME 250 Units Tape and Reel

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Typical Performance Characteristics Unless otherwise noted: T

VS= 5V, VCM = VS/2.

= 25°C, RL > 10 kΩ, VS= V+ – V–,

A

Offset Voltage Distribution

LMP2021/LMP2022

Offset Voltage Distribution

30014912

TCVOS Distribution

30014914

TCVOS Distribution

30014913

Offset Voltage vs. Supply Voltage

30014905

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30014915

PSRR vs. Frequency

30014930

LMP2021/LMP2022

Input Bias Current vs. V

Offset Voltage vs. V

CM

CM

30014962

Input Bias Current vs. V

Offset Voltage vs. V

CM

30014961

CM

30014906

Supply Current vs. Supply Voltage (Per Amplifier)

30014904

30014907

Input Voltage Noise vs. Frequency

30014926

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