LMV721M5NOPB - NATIONAL SEMICONDUCTOR

LMV721,LMV722

LMV721/LMV722 10MHz, Low Noise, Low Voltage, and Low Power Operational

Amplifier

Literature Number: SNOS414G

July 2, 2008

LMV721/LMV722

10MHz, Low Noise, Low Voltage, and Low Power

Operational Amplifier

General Description

The LMV721 (Single) and LMV722 (Dual) are low noise, low

voltage, and low power op amps, that can be designed into a

wide range of applications. The LMV721/LMV722 has a unity

gain bandwidth of 10MHz, a slew rate of 5V/us, and a quies-

cent current of 930uA/amplifier at 2.2V.

The LMV721/722 are designed to provide optimal perfor-

mance in low voltage and low noise systems. They provide

rail-to-rail output swing into heavy loads. The input common-

mode voltage range includes ground, and the maximum input

offset voltage are 3.5mV (Over Temp.) for the LMV721/

LMV722. Their capacitive load capability is also good at low

supply voltages. The operating range is from 2.2V to 5.5V.

The chip is built with National's advanced Submicron Silicon-

Gate BiCMOS process. The single version, LMV721, is avail-

able in 5 pin SOT23-5 and a SC-70 (new) package. The dual

version, LMV722, is available in a SO-8, MSOP-8 and 8-pin

LLP package.

Features

(For Typical, 5 V Supply Values; Unless Otherwise Noted)

■Guaranteed 2.2V and 5.0V Performance

■Low Supply Current LMV721/2 930µA/amplifier @2.2V

■High Unity-Gain Bandwidth 10MHz

■Rail-to-Rail Output Swing

@600Ω load 120mV from either rail at 2.2V

@2kΩ load 50mV from either rail at 2.2V

■Input Common Mode Voltage Range Includes Ground

■Silicon Dust™, SC70-5 Package 2.0x2.0x1.0 mm

■Miniature packaging: LLP-8 2.5mm × 3mm × 0.8mm

■Input Voltage Noise

Applications

■Cellular an Cordless Phones

■Active Filter and Buffers

■Laptops and PDAs

■Battery Powered Electronics

Typical Application

A Battery Powered Microphone Preamplifier

10092244

Silicon Dust™ is a trademark of National Semiconductor Corporation.

LMV721/LMV722 10MHz, Low Noise, Low Voltage, and Low Power Operational 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 2000V

Machine Model 100V

Differential Input Voltage ± Supply Voltage

Supply Voltage (V+ – V−)6V

Soldering Information

Infrared or Convection (20 sec.) 235°C

Storage Temp. Range −65°C to 150°C

Junction Temperature (Note 4) 150°C

Operating Ratings (Note 3)

Supply Voltage 2.2V to 5.5V

Temperature Range −40°C ≤T J ≤85°C

Thermal Resistance (θJA)

Silicon Dust SC70-5 Pkg 440°C/W

Tiny SOT23-5 Pkg 265 °C/W

SO Pkg, 8-pin Surface Mount 190°C/W

MSOP Pkg, 8-Pin Mini Surface

Mount

235 °C/W

SO Pkg, 14-Pin Surface Mount 145°C/W

LLP pkg, 8-Pin 58.2°C/W

2.2V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C. V+ = 2.2V, V− = 0V, VCM = V+/2, VO = V+/2 and R L > 1 MΩ.

Boldface limits apply at the temperature extremes.

Symbol Parameter Condition Typ

(Note 5)

Limit

(Note 6)

Units

VOS Input Offset Voltage 0.02 3

3.5

max

TCVOS Input Offset Voltage Average Drift 0.6 μV/°C

IBInput Bias Current 260 nA

IOS Input Offset Current 25 nA

CMRR Common Mode Rejection Ratio 0V ≤ VCM ≤ 1.3V 88 70

min

PSRR Power Supply Rejection Ratio 2.2V ≤ V+ ≤ 5V, VO = 0 VCM = 0 90 70

min

VCM Input Common-Mode Voltage Range For CMRR ≥ 50dB −0.30 V

1.3 V

AVLarge Signal Voltage Gain RL=600Ω

VO = 0.75V to 2.00V

81 75

min

RL= 2kΩ

VO = 0.50V to 2.10V

84 75

min

VOOutput Swing RL = 600Ω to V+/2 2.125 2.090

2.065

min

0.071 0.120

0.145

max

RL = 2kΩ to V+/2 2.177 2.150

2.125

min

0.056 0.080

0.105

max

IOOutput Current Sourcing, VO = 0V

VIN(diff) = ± 0.5V

14.9 10.0

5.0

min

Sinking, VO = 2.2V

VIN(diff) = ± 0.5V

17.6 10.0

5.0

min

ISSupply Current LMV721 0.93 1.2

1.5 mA

max

LMV722 1.81 2.2

2.6

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LMV721/LMV722

2.2V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C. V+ = 2.2V, V− = 0V, VCM = V+/2, VO = V+/2 and R L > 1 MΩ.

Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Typ

(Note 5)

Units

SR Slew Rate (Note 7) 4.9 V/μs

GBW Gain-Bandwidth Product 10 MHz

ΦmPhase Margin 67.4 Deg

GmGain Margin −9.8 dB

enInput-Referred Voltage Noise f = 1 kHz 9

inInput-Referred Current Noise f = 1 kHz 0.3

THD Total Harmonic Distortion f = 1 kHz AV = 1

RL = 600Ω, VO = 500 mVPP

0.004 %

5V DC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C. V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and RL > 1 MΩ.

Boldface limits apply at the temperature extremes.

Symbol Parameter Condition Typ

(Note 5)

Limit

(Note 6) Units

VOS Input Offset Voltage −0.08 3

3.5

max

TCVOS Input Offset Voltage Average Drift 0.6 μV/°C

IBInput Bias Current 260 nA

IOS Input Offset Current 25 nA

CMRR Common Mode Rejection Ratio 0V ≤ VCM ≤ 4.1V 89 70

min

PSRR Power Supply Rejection Ratio 2.2V ≤ V+ ≤ 5.0V, VO = 0 VCM = 0 90 70

min

VCM Input Common-Mode Voltage Range For CMRR ≥ 50dB −0.30 V

4.1 V

AVLarge Signal Voltage Gain RL = 600Ω

VO = 0.75V to 4.80V

87 80

min

RL = 2kΩ,

VO = 0.70V to 4.90V,

94 85

min

VOOutput Swing RL = 600Ω to V+/2 4.882 4.840

4.815

min

0.134 0.190

0.215

max

RL = 2kΩ to V+/2 4.952 4.930

4.905

min

0.076 0.110

0.135

max

I O Output Current Sourcing, VO = 0V

VIN(diff) = ±0.5V

52.6 25.0

12.0

min

Sinking, VO = 5V

VIN(diff) = ±0.5V

23.7 15.0

8.5

min

I S Supply Current LMV721 1.03 1.4

1.7 mA

max

LMV722 2.01 2.4

2.8

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LMV721/LMV722

5V AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C. V+ = 5V, V− = 0V, VCM = V+/2, VO = V+/2 and R L > 1 MΩ.

Boldface limits apply at the temperature extremes.

Symbol Parameter Conditions Typ

(Note 5) Units

SR Slew Rate (Note 7) 5.25 V/μs

GBW Gain-Bandwidth Product 10.0 MHz

ΦmPhase Margin 72 Deg

GmGain Margin −11 dB

enInput-Related Voltage Noise f = 1 kHz 8.5

inInput-Referred Current Noise f = 1 kHz 0.2

THD Total Harmonic Distortion f = 1kHz, AV = 1

RL = 600Ω, VO = 1 VPP

0.001 %

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.

Note 2: Human body model, 1.5 kΩ in series with 100 pF. Machine model, 200Ω in series with 100 pF.

Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the

maximum allowed junction temperature of 150°C. Output currents in excess of 30 mA over long term may adversely affect reliability.

Note 4: The maximum power dissipation is a function of TJ(max), θJA, and TA . The maximum allowable power dissipation at any ambient temperature is

P D = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board.

Note 5: Typical Values represent the most likely parametric norm.

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

Note 7: Connected as voltage follower with 1V step input. Number specified is the slower of the positive and negative slew rate.

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LMV721/LMV722

Typical Performance Characteristics

Supply Current vs. Supply Voltage (LMV721)

10092201

Sourcing Current vs. Output Voltage (VS = 2.2V)

10092202

Sourcing Current vs.

Output Voltage (VS = 5V)

10092203

Sinking Current vs. Output Voltage (VS = 2.2V)

10092204

Sinking Current vs. Output Voltage (VS = 5V)

10092205

Output Voltage Swing vs. Supply Voltage (RL = 600Ω)

10092206

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LMV721/LMV722

Output Voltage Swing vs. Suppy Voltage

(RL = 2kΩ)

10092207

Input Offset Voltage vs. Input Common-Mode Voltage Range

VS = 2.2V

10092208

Input Offset Voltage vs. Input Common-Mode Voltage Range

VS = 5V

10092209

Input Offset Voltage vs. Supply Voltage

(VCM = V+/2)

10092210

Input Voltage vs. Output Voltage (VS = 2.2V, RL = 2kΩ)

10092211

Input Voltage vs. Output Voltage (VS = 5V, RL = 2kΩ)

10092212

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LMV721/LMV722

Input Voltage Noise vs. Frequency

10092238

Input Current Noise vs. Frequency

10092232

+PSRR vs. Frequency

10092213

−PSRR vs. Frequency

10092214

CMRR vs. Frequency

10092245

Gain and Phase Margin vs. Frequency

(VS = 2.2V, RL 600Ω)

10092215

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LMV721/LMV722

Gain and Phase Margin vs. Frequency

(VS = 5V, RL 600Ω)

10092216

Slew Rate vs. Supply Voltage

10092217

THD vs. Frequency

10092242

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LMV721/LMV722

Application Notes

1.0 BENEFITS OF THE LMV721/722 SIZE

The small footprints of the LMV721/722 packages save space

on printed circuit boards, and enable the design of smaller

electronic products, such as cellular phones, pagers, or other

portable systems. The low profile of the LMV721/722 make

them possible to use in PCMCIA type III cards.

Signal Integrity. Signals can pick up noise between the sig-

nal source and the amplifier. By using a physically smaller

amplifier package, the LMV721/722 can be placed closer to

the signal source, reducing noise pickup and increasing sig-

nal integrity.

Simplified Board Layout. These products help you to avoid

using long pc traces in your pc board layout. This means that

no additional components, such as capacitors and resistors,

are needed to filter out the unwanted signals due to the inter-

ference between the long pc traces.

Low Supply Current. These devices will help you to maxi-

mize battery life. They are ideal for battery powered systems.

Low Supply Voltage. National provides guaranteed perfor-

mance at 2.2V and 5V. These guarantees ensure operation

throughout the battery lifetime.

Rail-to-Rail Output. Rail-to-rail output swing provides maxi-

mum possible dynamic range at the output. This is particularly

important when operating on low supply voltages.

Input Includes Ground. Allows direct sensing near GND in

single supply operation.

Protection should be provided to prevent the input voltages

from going negative more than −0.3V (at 25°C). An input

clamp diode with a resistor to the IC input terminal can be

used.

2.0 CAPACITIVE LOAD TOLERANCE

The LMV721/722 can directly drive 4700pF in unity-gain with-

out oscillation. The unity-gain follower is the most sensitive

configuration to capacitive loading. Direct capacitive loading

reduces the phase margin of amplifiers. The combination of

the amplifier's output impedance and the capacitive load in-

duces phase lag. This results in either an underdamped pulse

response or oscillation. To drive a heavier capacitive load,

circuit in Figure 1 can be used.

10092218

FIGURE 1. Indirectly Driving A capacitive Load Using

Resistive Isolation

In Figure 1, the isolation resistor RISO and the load capacitor

CL form a pole to increase stability by adding more phase

margin to the overall system. the desired performance de-

pends on the value of RISO. The bigger the RISO resistor value,

the more stable VOUT will be. Figure 2 is an output waveform

of Figure 1 using 100kΩ for RISO and 2000µF for CL.

10092231

FIGURE 2. Pulse Response of the LMV721 Circuit in

Figure 1

The circuit in Figure 3 is an improvement to the one in Figure

1 because it provides DC accuracy as well as AC stability. If

there were a load resistor in Figure 1, the output would be

voltage divided by RISO and the load resistor. Instead, in Fig-

ure 3, RF provides the DC accuracy by using feed-forward

techniques to connect VIN to RL. Caution is needed in choos-

ing the value of RF due to the input bias current of the

LMV721/722. CF and RISO serve to counteract the loss of

phase margin by feeding the high frequency component of the

output signal back to the amplifier's inverting input, thereby

preserving phase margin in the overall feedback loop. In-

creased capacitive drive is possible by increasing the value

of CF. This in turn will slow down the pulse response.

10092219

FIGURE 3. Indirectly Driving A Capacitive Load with DC

Accuracy

3.0 INPUT BIAS CURRENT CANCELLATION

The LMV721/722 family has a bipolar input stage. The typical

input bias current of LMV721/722 is 260nA with 5V supply.

Thus a 100kΩ input resistor will cause 26mV of error voltage.

By balancing the resistor values at both inverting and non-

inverting inputs, the error caused by the amplifier's input bias

current will be reduced. The circuit in Figure 4 shows how to

cancel the error caused by input bias current.

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LMV721/LMV722

10092220

FIGURE 4. Cancelling the Error Caused by Input Bias

Current

4.0 TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS

4.1 Difference Amplifier

The difference amplifier allows the subtraction of two voltages

or, as a special case, the cancellation of a signal common to

two inputs. It is useful as a computational amplifier, in making

a differential to single-ended conversion or in rejecting a com-

mon mode signal.

10092221

FIGURE 5. Difference Application

4.2 Instrumentation Circuits

The input impendance of the previous difference amplifier is

set by the resistor R1, R2, R3 and R4. To eliminate the prob-

lems of low input impendance, one way is to use a voltage

follower ahead of each input as shown in the following two

instrumentation amplifiers.

4.2.1 Three-op-amp Instrumentation Amplifier

The LMV721/722 can be used to build a three-op-amp instru-

mentation amplifier as shown in Figure 6

10092230

FIGURE 6. Three-op-amp Instrumentation Amplifier

The first stage of this instrumentation amplifier is a differential-

input, differential-output amplifier, with two voltage followers.

These two voltage followers assure that the input impedance

is over 100MΩ. The gain of this instrumentation amplifier is

set by the ratio of R2/R1. R3 should equal R1 and R4 equal

R2. Matching of R3 to R1 and R4 to R2 affects the CMRR. For

good CMRR over temperature, low drift resistors should be

used. Making R4 slightly smaller than R2 and adding a trim

pot equal to twice the difference between R2 and R4 will allow

the CMRR to be adjusted for optimum.

4.2.2 Two-op-amp Instrumentation Amplifier

A two-op-amp instrumentation amplifier can also be used to

make a high-input impedance DC differential amplifier (Figure

7). As in the two-op-amp circuit, this instrumentation amplifier

requires precise resistor matching for good CMRR. R4 should

equal to R1 and R3 should equal R2.

10092222

FIGURE 7. Two-op-amp Instrumentation Amplifier

4.3 Single-Supply Inverting Amplifier

There may be cases where the input signal going into the

amplifier is negative. Because the amplifier is operating in

single supply voltage, a voltage divider using R3 and R4 is

implemented to bias the amplifier so the input signal is within

the input common-common voltage range of the amplifier.

The capacitor C1 is placed between the inverting input and

resistor R1 to block the DC signal going into the AC signal

source, VIN. The values of R1 and C1 affect the cutoff fre-

quency, fc = ½π R1C1.

As a result, the output signal is centered around mid-supply

(if the voltage divider provides V+/2 at the non-inverting input).

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LMV721/LMV722

The output can swing to both rails, maximizing the signal-to-

noise ratio in a low voltage system.

10092223

FIGURE 8. Single-Supply Inverting Amplifier

4.4 Active Filter

4.4.1 Simple Low-Pass Active Filter

The simple low-pass filter is shown in Figure 9. Its low-pass

frequency gain (ω → o) is defined by −R3/R1. This allows low-

frequency gains other than unity to be obtained. The filter has

a −20dB/decade roll-off after its corner frequency R2

should be chosen equal to the parallel combination of R1 and

R3 to minimize error due to bias current. The frequency re-

sponse of the filter is shown in Figure 10.

10092224

FIGURE 9. Simple Low-Pass Active Filter

10092225

FIGURE 10. Frequency Response of Simple Low-pass

Active Filter in Figure 9

Note that the single-op-amp active filters are used in to the

applications that require low quality factor, Q(≤ 10), low fre-

quency (≤ 5KHz), and low gain (≤ 10), or a small value for the

product of gain times Q(≤ 100). The op amp should have an

open loop voltage gain at the highest frequency of interest at

least 50 times larger than the gain of the filter at this frequen-

cy. In addition, the selected op amp should have a slew rate

that meets the following requirement:

Slew Rate ≥ 0.5 x (ωH VOPP) X 10 −6V/µsec

Where ωH is the highest frequency of interest, and VOPP is the

output peak-to-peak voltage.

10092244

FIGURE 11. A Battery Powered Microphone Preamplifier

Here is a LMV721 used as a microphone preamplifier. Since

the LMV721 is a low noise and low power op amp, it makes

it an ideal candidate as a battery powered microphone pream-

plifier. The LMV721 is connected in an inverting configuration.

Resistors, R1 = R2 = 4.7kΩ, sets the reference half way be-

tween VCC = 3V and ground. Thus, this configures the op amp

for single supply use. The gain of the preamplifier, which is

50 (34dB), is set by resistors R3 = 10kΩ and R4 = 500kΩ. The

gain bandwidth product for the LMV721 is 10 MHz. This is

sufficient for most audio application since the audio range is

typically from 20 Hz to 20kHz. A resistor R5 = 5kΩ is used to

bias the electret microphone. Capacitors C1 = C2 = 4.7µF

placed at the input and output of the op amp to block out the

DC voltage offset.

11 www.national.com

LMV721/LMV722

Connection Diagrams

5-Pin SC-70/SOT23-5

10092299

Top View

8-Pin SO/MSOP/LLP*

10092263

Top View

Note: LLP-8 exposed DAP can be electrically connected to ground for im-

proved thermal performance.

Ordering Information

Package

Temperature Range

Package Marking Transport Media NSC Drawing

Industrial

−40°C to +85°C

8-Pin Small Outline LMV722M LMV722M Rails M08A

LMV722MX 2.5k Units Tape and Reel

8-pin MSOP LMV722MM LMV722 1k Units Tape and Reel MUA08A

LMV722MMX 3.5k Units Tape and Reel

8-pin LLP LMV722LD L22 1k Units Tape and Reel LDA08C

LMV722LDX 3.5k Units Tape and Reel

5-Pin SOT23 LMV721M5 A30A 1k Units Tape and Reel MF05A

LMV721M5X 3k Units Tape and Reel

5-Pin SC-70 LMV721M7 A20 1k Units Tape and Reel MAA05A

LMV721M7X 3k Units Tape and Reel

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LMV721/LMV722

Physical Dimensions inches (millimeters) unless otherwise noted

8-Pin SOIC

NS Package Number M08A

8-Pin LLP

NS Package Number LDA08C

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LMV721/LMV722

8-Pin MSOP

NS Package Number MUA08A

5-Pin SOT23

NS Package Number MF05A

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LMV721/LMV722

SC70-5

NS Package Number MAA05A

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LMV721/LMV722

Notes

LMV721/LMV722 10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier

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acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products

and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be

provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in

such safety-critical applications.

TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are

specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military

specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at

the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.

TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are

designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated

products in automotive applications, TI will not be responsible for any failure to meet such requirements.

Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products Applications

Audio www.ti.com/audio Communications and Telecom www.ti.com/communications

Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers

Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps

DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy

DSP dsp.ti.com Industrial www.ti.com/industrial

Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical

Interface interface.ti.com Security www.ti.com/security

Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265