Texas Instruments LMP7731 Manuale utente

LMP7731

LMP7731 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

Literature Number: SNOSAT6D

LMP7731

May 20, 2009

2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

General Description

The LMP7731 is a single, low noise, rail-to-rail input and out-

put, low voltage amplifier. The LMP7731 is part of the LMP®

precision amplifier family and is ideal for precision and low

noise applications with low voltage requirements.

This operational amplifier offers low voltage noise of 2.9 nV/

√Hz with a 1/f corner of only 3 Hz. The LMP7731 has bipolar

input stages with a bias current of only 1.5 nA. This low input

bias current, complemented by the very low level of voltage

noise, makes the LMP7731 an excellent choice for photom-

etry applications.

The LMP7731 provides a wide GBW of 22 MHz while con-

suming only 2 mA of current. This high gain bandwidth along

with the high open loop gain of 130 dB enables accurate sig-

nal conditioning in applications with high closed loop gain

requirements.

The LMP7731 has a supply voltage range of 1.8V to 5.5V,

making it an ideal choice for battery operated portable appli-

cations.

The LMP7731 is offered in the space saving 5-Pin SOT-23

and 8-Pin SOIC packages.

Features

(Typical values, TA= 25°C, VS= 5V)

■Input voltage noise

—f = 3 Hz 3.3 nV/√Hz

—f = 1 kHz 2.9 nV/√Hz

■CMRR 130 dB

■Open loop gain 130 dB

■GBW 22 MHz

■Slew rate 2.4 V/µs

■THD @ f = 10 kHz, AV= +1, RL= 2 kΩ0.001%

■Supply current per channel 2.2 mA

■Supply voltage range 1.8V to 5.5V

■Operating temperature range −40°C to 125°C

■Input bias current ±1.5 nA

■RRIO

Applications

■Gas analysis instruments

■Photometric instrumentation

■Medical instrumentation

Typical Performance Characteristics

Input Voltage Noise vs. Frequency

20175261

Input Current Noise vs. Frequency

20175262

LMP®is a registered trademark of National Semiconductor Corporation.

LMP7731 2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

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

Inputs pins only 2000V

All other pins 2000V

Machine Model 200V

Charge Device Model 1000V

VIN Differential ±2V

Supply Voltage (VS= V+– V−)6.0V

Storage Temperature Range −65°C to 150°C

Junction Temperature (Note 3) +150°C max

Soldering Information

Infrared or Convection (20 sec) 235°C

Wave Soldering Lead Temp. (10 sec) 260°C

Operating Ratings (Note 1)

Temperature Range −40°C to 125°C

Supply Voltage (VS= V+– V–)1.8V to 5.5V

Package Thermal Resistance (θJA)

5-Pin SOT-23 265°C/W

8-Pin SOIC 190°C/W

2.5V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA= 25°C, V+= 2.5V, V−= 0V, VCM = V+/2, RL>10 kΩto V+/2. Bold-

face limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

VOS

Input Offset Voltage

(Note 7)

VCM = 2.0V ±9 ±500

±600 μV

VCM = 0.5V ±9 ±500

±600

TCVOS Input Offset Voltage Temperature Drift VCM = 2.0V ±0.5 ±5.5 μV/°C

VCM = 0.5V ±0.2 ±5.5

IBInput Bias Current

VCM = 2.0V ±1 ±30

±45 nA

VCM = 0.5V ±12 ±50

±75

IOS Input Offset Current

VCM = 2.0V ±1 ±50

±75 nA

VCM = 0.5V ±11 ±60

±80

TCIOS Input Offset Current Drift VCM = 0.5V and VCM = 2.0V 0.0474 nA/°C

CMRR Common Mode Rejection Ratio

0.15V ≤VCM ≤0.7V

0.23V ≤VCM ≤0.7V

101

120

1.5V ≤VCM ≤2.35V

1.5V ≤VCM ≤2.27V

105

129

PSRR Power Supply Rejection Ratio 2.5V ≤V+≤5V 111

105

129

1.8V ≤V+≤5.5V 117

CMVR Common Mode Voltage Range Large Signal CMRR ≥80 dB 0 2.5 V

AVOL Open Loop Voltage Gain

RL= 10 kΩto V+/2

VOUT = 0.5V to 2.0V

112

104

130

RL= 2 kΩto V+/2

VOUT = 0.5V to 2.0V

109

119

www.national.com 2

LMP7731

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

VOUT

Output Voltage Swing High

RL= 10 kΩto V+/2 4 50

mV from

either rail

RL= 2 kΩto V+/2 13 50

Output Voltage Swing Low

RL= 10 kΩto V+/2 6 50

RL= 2 kΩto V+/2 9 50

IOUT Output Current

Sourcing, VOUT = V+/2

VIN (diff) = 100 mV

Sinking, VOUT = V+/2

VIN (diff) = −100 mV

Supply Current

(Per Channel)

VCM = 2.0V 2.0 2.7

3.4 mA

VCM = 0.5V 2.3 3.1

3.9

SR Slew Rate AV= +1, CL= 10 pF, RL= 10 kΩto V+/2,

VO= 2 VPP

2.4 V/μs

GBW Gain Bandwidth CL= 20 pF, RL= 10 kΩto V+/2 21 MHz

GMGain Margin CL= 20 pF, RL= 10 kΩto V+/2 14 dB

ΦMPhase Margin CL= 20 pF, RL= 10 kΩto V+/2 60 deg

RIN Input Resistance Differential Mode 38 kΩ

Common Mode 151 MΩ

THD+N Total Harmonic Distortion + Noise AV= 1, f = 1 kHz, Amplitude = 1V 0.002 %

Input Referred Voltage Noise Density f = 1 kHz, VCM = 2.0V 3

nV/

f = 1 kHz, VCM = 0.5V 3

Input Voltage Noise 0.1 Hz to 10 Hz 75 nVPP

inInput Referred Current Noise Density f = 1 kHz, VCM = 2.0V 1.1

pA/

f = 1 kHz, VCM = 0.5V 2.3

3.3V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA= 25°C, V+= 3.3V, V−= 0V, VCM = V+/2, RL> 10 kΩto V+/2. Bold-

face limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

VOS

Input Offset Voltage

(Note 7)

VCM = 2.5V ±6 ±500

±600 μV

VCM = 0.5V ±6 ±500

±600

TCVOS Input Offset Voltage Temperature Drift VCM = 2.5V ±0.5 ±5.5 μV/°C

VCM = 0.5V ±0.2 ±5.5

IBInput Bias Current

VCM = 2.5V ±1.5 ±30

±45 nA

VCM = 0.5V ±13 ±50

±77

IOS Input Offset Current

VCM = 2.5V ±1 ±50

±70 nA

VCM = 0.5V ±11 ±60

±80

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LMP7731

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

TCIOS Input Offset Current Drift VCM = 0.5V and VCM = 2.5V 0.048 nA/°C

CMRR Common Mode Rejection Ratio

0.15V ≤VCM ≤0.7V

0.23V ≤VCM ≤0.7V

101

120

1.5V ≤VCM ≤3.15V

1.5V ≤VCM ≤3.07V

105

130

PSRR Power Supply Rejection Ratio 2.5V ≤V+≤5.0V 111

105

129

1.8V ≤V+≤5.5V 117

CMVR Common Mode Voltage Range Large Signal CMRR ≥80 dB 0 3.3 V

AVOL Open Loop Voltage Gain

RL= 10 kΩto V+/2

VOUT = 0.5V to 2.8V

112

104

130

RL= 2 kΩto V+/2

VOUT = 0.5V to 2.8V

110

119

VOUT

Output Voltage Swing High

RL= 10 kΩto V+/2 5 50

mV from

either rail

RL= 2 kΩto V+/2 14 50

Output Voltage Swing Low

RL= 10 kΩto V+/2 9 50

RL= 2 kΩto V+/2 13 50

IOUT Output Current

Sourcing, VOUT = V+/2

VIN (diff) = 100 mV

Sinking, VOUT = V+/2

VIN (diff) = -100 mV

Supply Current

(Per Channel)

VCM = 2.5V 2.1 2.8

3.5 mA

VCM = 0.5V 2.4 3.2

4.0

SR Slew Rate AV= +1, CL= 10 pF, RL= 10 kΩto V+/2,

VOUT = 2 VPP

2.4 V/μs

GBW Gain Bandwidth CL= 20 pF, RL= 10 kΩto V+/2 22 MHz

GMGain Margin CL= 20 pF, RL= 10 kΩto V+/2 14 dB

ΦMPhase Margin CL= 20 pF, RL= 10 kΩto V+/2 62 deg

RIN Input Resistance Differential Mode 38 kΩ

Common Mode 151 MΩ

THD+N Total Harmonic Distortion + Noise AV= 1, f = 1 kHz, Amplitude = 1V, 0.002 %

Input Referred Voltage Noise Density f = 1 kHz, VCM = 2.5V 2.9

nV/

f = 1 kHz, VCM = 0.5V 2.9

Input Voltage Noise 0.1 Hz to 10 Hz 65 nVPP

inInput Referred Current Noise Density f = 1 kHz, VCM = 2.5V 1.1

pA/

f = 1 kHz, VCM = 0.5V 2.1

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LMP7731

5V Electrical Characteristics (Note 4)

Unless otherwise specified, all limits are guaranteed for TA= 25°C, V+= 5V, V−= 0V, VCM = V+/2, RL> 10 kΩto V+/2. Boldface

limits apply at the temperature extremes.

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

VOS

Input Offset Voltage

(Note 7)

VCM = 4.5V ±6 ±500

±600 μV

VCM = 0.5V ±6 ±500

±600

TCVOS Input Offset Voltage Temperature Drift VCM = 4.5V ±0.5 ±5.5 μV/°C

VCM = 0.5V ±0.2 ±5.5

IBInput Bias Current

VCM = 4.5V ±1.5 ±30

±50 nA

VCM = 0.5V ±14 ±50

±85

IOS Input Offset Current

VCM = 4.5V ±1 ±50

±70 nA

VCM = 0.5V ±11 ±65

±80

TCIOS Input Offset Current Drift VCM = 0.5V and VCM = 4.5V 0.0482 nA/°C

CMRR Common Mode Rejection Ratio

0.15V ≤VCM ≤0.7V

0.23V ≤VCM ≤0.7V

101

120

1.5V ≤VCM ≤4.85V

1.5V ≤VCM ≤4.77V

105

130

PSRR Power Supply Rejection Ratio 2.5V ≤V+≤5V 111

105

129

1.8V ≤V+≤5.5V 117

CMVR Common Mode Voltage Range Large Signal CMRR ≥80 dB 0 5 V

AVOL Open Loop Voltage Gain

RL= 10 kΩto V+/2

VOUT = 0.5V to 4.5V

112

104

130

RL= 2 kΩto V+/2

VOUT = 0.5V to 4.5V

110

119

VOUT

Output Voltage Swing High

RL= 10 kΩto V+/2 8 50

mV from

either rail

RL= 2 kΩto V+/2 24 50

Output Voltage Swing Low

RL= 10 kΩto V+/2 9 50

RL= 2 kΩto V+/2 23 50

IOUT Output Current

Sourcing, VOUT = V+/2

VIN (diff) = 100 mV

Sinking, VOUT = V+/2

VIN (diff) = -100 mV

Supply Current

(Per Channel)

VCM = 4.5V 2.2 3.0

3.7 mA

VCM = 0.5V 2.5 3.4

4.2

SR Slew Rate AV= +1, CL= 10 pF, RL= 10 kΩto V+/2,

VOUT = 2 VPP

2.4 V/μs

GBW Gain Bandwidth CL= 20 pF, RL= 10 kΩto V+/2 22 MHz

5 www.national.com

LMP7731

Symbol Parameter Conditions Min

(Note 6)

Typ

(Note 5)

Max

(Note 6) Units

GMGain Margin CL= 20 pF, RL= 10 kΩto V+/2 12 dB

ΦMPhase Margin CL= 20 pF, RL= 10 kΩto V+/2 65 deg

RIN Input Resistance Differential Mode 38 kΩ

Common Mode 151 MΩ

THD+N Total Harmonic Distortion + Noise AV= 1, f = 1 kHz, Amplitude = 1V 0.001 %

Input Referred Voltage Noise Density f = 1 kHz, VCM = 4.5V 2.9

nV/

f = 1 kHz, VCM = 0.5V 2.9

Input Voltage Noise 0.1 Hz to 10 Hz 78 nVPP

inInput Referred Current Noise Density f = 1 kHz, VCM = 4.5V 1.1

pA/

f = 1 kHz, VCM = 0.5V 2.2

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, 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 TJ(MAX), θJA. The maximum allowable power dissipation at any ambient temperature is

PD= (TJ(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 maybe permanently degraded, either mechanically or electrically.

Note 5: Typical values represent the most likely parametric norm as determined 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: Ambient production test is performed at 25°C with a variance of ±3°C.

Connection Diagrams

5-Pin SOT-23

20175202

Top View

8-Pin SOIC

20175203

Top View

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

5-Pin SOT-23

LMP7731MF

AY3A

1k Units Tape and Reel

MF05ALMP7731MFE 250 Units Tape an Reel

LMP7731MFX 3k Units Tape and Reel

8-Pin SOIC LMP7731MA LMP7731MA 95 Units/Rail M08A

LMP7731MAX 2.5k Tape and Reel

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LMP7731

Typical Performance Characteristics Unless otherwise noted: TA= 25°C, RL> 10 kΩ, VCM = VS/2.

Offset Voltage Distribution

20175238

TCVOS Distribution

20175234

Offset Voltage Distribution

20175239

TCVOS Distribution

20175236

Offset Voltage Distribution

20175240

TCVOS Distribution

20175235

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LMP7731

Offset Voltage Distribution

20175241

TCVOS Distribution

20175237

Offset Voltage vs. Temperature

20175251

Offset Voltage vs. Temperature

20175252

PSRR vs. Frequency

20175229

CMRR vs. Frequency

20175256

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LMP7731

Offset Voltage vs. Supply Voltage

20175242

Offset Voltage vs. VCM

20175243

Offset Voltage vs. VCM

20175244

Offset Voltage vs. VCM

20175245

Input Offset Voltage Time Drift

20175230

Slew Rate vs. Supply Voltage

20175220

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LMP7731

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