LMV821M7XNOPB - NATIONAL SEMICONDUCTOR

LMV761/LMV762/LMV762Q

June 27, 2012

Low Voltage, Precision Comparator with Push-Pull Output

General Description

The LMV761/LMV762/LMV762Q are precision comparators

intended for applications requiring low noise and low input

offset voltage. The LMV761 single has a shutdown pin that

can be used to disable the device and reduce the supply cur-

rent. The LMV761 is available in a space saving 6-Pin SOT-23

or 8-Pin SOIC package. The LMV762 dual is available in 8-

Pin SOIC or MSOP package and LMV762Q in MSOP and

SOIC package.

They feature a CMOS input and Push-Pull output stage. The

Push-Pull output stage eliminates the need for an external

pull-up resistor.

The LMV761/LMV762/LMV762Q are designed to meet the

demands of small size, low power and high performance re-

quired by portable and battery operated electronics.

The input offset voltage has a typical value of 200μV at room

temp and a 1mV limit over temp.

Features

(VS = 5V, TA = 25°C, typical values unless specified).

■Input offset voltage 0.2mV

■Input offset voltage (max over temp) 1mV

■Input bias current 0.2pA

■Propagation delay (OD = 50mV) 120 nsec

■Low supply current 300μA

■CMRR 100dB

■PSRR 110dB

■Extended Temperature Range −40°C to 125°C

■Push-pull output

■Ideal for 2.7V and 5V single supply applications

■Available in space-saving packages:

6-Pin SOT-23 (single w/shutdown)

8-Pin SOIC (single w/shutdown)

8-Pin SOIC/MSOP (dual without shutdown)

■LMV762Q is an Automotive grade product that is AEC-

Q100 grade 1 qualified and is manufactured on an

automotive grade flow

Applications

■Portable and battery-powered systems

■Scanners

■Set top boxes

■High speed differential line receiver

■Window comparators

■Zero-crossing detectors

■High speed sampling circuits

■Automotive

Typical Circuit

20037032

Threshold Detector

VOS vs. VCC

20037010

LMV761/LMV762/LMV762Q Low Voltage, Precision Comparator with Push-Pull Output

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the Texas Instruments Sales Office/

Distributors for availability and specifications.

ESD Tolerance (Note 2)

Human Body Model 2000V

Machine Model 200V

Supply Voltage (V+ – V−)5.5V

Differential Input Voltage Supply Voltage

Voltage between any two pins Supply Voltage

Output Short Circuit Duration (Note 9)

Current at Input Pin ±5 mA

Soldering Information

Infrared or Convection (20 sec.) 235°C

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

Junction Temperature 150°C

Storage Temperature Range −65°C to 150°C

Operating Ratings

Supply Voltage (V+ – V−)2.7V to 5.25V

Temperature Range −40°C to +125°C

Package Thermal Resistance (Note 4)

6-Pin SOT-23 265°C/W

8-Pin SOIC 190°C/W

8-Pin MSOP 235°C/W

2.7V Electrical Characteristics

Unless otherwise specified, all limited guaranteed for TJ = 25°C, VCM = V+/2, V+ = 2.7V, V− = 0V−. Boldface limits apply at the

temperature extremes. (Note 5)

Symbol Parameter Condition Min

(Note 7)

Typ

(Note 6)

Max

(Note 7)Units

VOS Input Offset Voltage 0.2 1.0 mV

IBInput Bias Current (Note 8) 0.2 50 pA

IOS Input Offset Current (Note 8) .001 5 pA

CMRR Common Mode Rejection Ratio 0V < VCM < VCC - 1.3V 80 100 dB

PSRR Power Supply Rejection Ratio V+ = 2.7V to 5V 80 110 dB

CMVR Input Common Mode Voltage

Range CMRR > 50dB −0.3

1.5 V

Output Swing High IL = 2mA, VID = 200mV V+ – 0.35 V+ – 0.1 V

Output Swing Low IL = −2mA, VID = −200mV 90 250 mV

ISC

Output Short Circuit Current

(Note 3)

Sourcing, VO = 1.35V, VID = 200mV 6.0 20 mA

Sinking, VO = 1.35V, VID = −200mV 6.0 15

Supply Current μA

LMV761 (Single Comparator) 275 700

LMV762/LMV762Q (Both

Comparators) 550 1400 μA

IOUT

LEAKAGE

Output Leakage I @ Shutdown SD = GND, VO = 2.7V 0.20 μA

IS LEAKAGE Supply Leakage I @ Shutdown SD = GND, VCC = 2.7V 0.20 2 μA

tPD

Propagation Delay

RL = 5.1kΩ

CL = 50pF

Overdrive = 5mV 270

nsOverdrive = 10mV 205

Overdrive = 50mV 120

tSKEW Propagation Delay Skew 5 ns

trOutput Rise Time 10% to 90% 1.7 ns

tfOutput Fall Time 90% to 10% 1.8 ns

ton Turn On Time From Shutdown 6 μs

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LMV761/LMV762/LMV762Q

5.0V Electrical Characteristics

Unless otherwise specified, all limited guaranteed for TJ = 25°C, VCM = V+/2, V+ = 5.0V, V− = 0V−. Boldface limits apply at the

temperature extremes.

Symbol Parameter Condition Min

(Note 7)

Typ

(Note 6)

Max

(Note 7)Units

VOS Input Offset Voltage 0.2 1.0 mV

IBInput Bias Current (Note 8) 0.2 50 pA

IOS Input Offset Current (Note 8) 0.01 5 pA

CMRR Common Mode Rejection Ratio 0V < VCM < VCC - 1.3V 80 100 dB

PSRR Power Supply Rejection Ratio V+ = 2.7V to 5V 80 110 dB

CMVR Input Common Mode Voltage

Range CMRR > 50dB −0.3

3.8 V

Output Swing High IL = 4mA, VID = 200mV V+ – 0.35 V+ – 0.1 V

Output Swing Low IL = −4mA, VID = −200mV 120 250 mV

ISC

Output Short Circuit Current

(Note 3)

Sourcing, VO = 2.5V, VID = 200mV 6.0 60 mA

Sinking, VO = 2.5V, VID = −200mV 6.0 40

Supply Current μA

LMV761 (Single Comparator) 225 700

LMV762/LMV762Q (Both

Comparators)

450 1400 μA

IOUT

LEAKAGE

Output Leakage I @ Shutdown SD = GND, VO = 5.0V 0.20 μA

IS LEAKAGE Supply Leakage I @ Shutdown SD = GND, VCC = 5.0V 0.20 2 μA

tPD

Propagation Delay

RL = 5.1kΩ

CL = 50pF

Overdrive = 5mV 225

nsOverdrive = 10mV 190

Overdrive = 50mV 120

tSKEW Propagation Delay Skew 5 ns

trOutput Rise Time 10% to 90% 1.7 ns

tfOutput Fall Time 90% to 10% 1.5 ns

ton Turn On Time from Shutdown 4 μs

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 condition, see the Electrical Characteristics.

Note 2: Unless otherwise specified human body model is 1.5kΩ in series with 100pF. Machine model 200pF.

Note 3: 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. See Application section for information on temperature de-rating of this device. Absolute Maximum Rating indicate junction temperature limits beyond which

the device may be permanently degraded, either mechanically or electrically.

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

PD = (TJ(MAX)-TA)θJA. All numbers apply for packages soldered directly into a PC board.

Note 5: Maximum temperature guarantee range is −40°C to 125°C.

Note 6: Typical values represent the most likely parametric norm.

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

Note 8: Guaranteed by design.

Note 9: 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 current in excess of ±25 mA over long term may adversely affect reliability.

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LMV761/LMV762/LMV762Q

Connection Diagrams

LMV761 (Single)

6-Pin SOT-23

20037001

Top View

LMV761 (Single)

8-Pin SOIC

20037002

Top View

LMV762/LMV762Q (Dual)

8-Pin SOIC and MSOP

20037003

Top View

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

6-Pin SOT-23 LMV761MF C22A 1k units Tape and Reel MF06A

LMV761MFX 3k units Tape and Reel

8-Pin SOIC

LMV761MA LMV761MA 95 Units/Rail

M08A

LMV761MAX 2.5k Units Tape and Reel

LMV762MA LMV762MA 95 Units/Rail

LMV762MAX 2.5k Units Tape and Reel

8-Pin SOIC LMV762QMA LMV762QMA 95 Units/Rail M08A

LMV762QMAX 2.5k Units Tape and Reel

8-Pin MSOP LMV762MM C23A 1k Units Tape and Reel MUA08A

LMV762MMX 3.5k Units Tape and Reel

8-Pin MSOP LMV762QMM C32A 1k Units Tape and Reel MUA08A

LMV762QMMX 3.5k Units Tape and Reel

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LMV761/LMV762/LMV762Q

Typical Performance Characteristics

PSI vs. VCC (VO = High)

20037004

PSI vs. VCC (VO = Low)

20037005

VOS vs. VCC

20037010

Input Bias vs. Common Mode @ 25°C

20037024

Input Bias vs. Common Mode @ 25°C

20037025

Output Voltage vs. Supply Voltage

20037011

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LMV761/LMV762/LMV762Q

Output Voltage vs. Supply Voltage

20037012

Output Voltage vs. Supply Voltage

20037013

Output Voltage vs. Supply Voltage

20037014

ISOURCE vs. VOUT

20037006

ISINK vs. VOUT

20037007

ISOURCE vs. VOUT

20037008

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LMV761/LMV762/LMV762Q

ISINK vs. VOUT

20037009

Prop Delay vs. Overdrive

20037019

Response Time vs. Input Overdrives Positive Transition

20037020

Response Time vs. Input Overdrives Positive Transition

20037021

Response Time vs. Input Overdrives Negative Transition

20037022

Response Time vs. Input Overdrives Negative Transition

20037023

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LMV761/LMV762/LMV762Q

Application Information

BASIC COMPARATOR

A basic comparator circuit is used to convert analog input

signals to digital output signals. The comparator compares an

input voltage (VIN) at the non-inverting input to the reference

voltage (VREF) at the inverting pin. If VIN is less than VREF the

output (VO) is low (VOL). However, if VIN is greater than

VREF, the output voltage (VO) is high (VOH).

20037028

20037031

FIGURE 1. Basic Comparator

HYSTERESIS

The basic comparator configuration may oscillate or produce

a noisy output if the applied differential input is near the

comparator's input offset voltage. This tends to occur when

the voltage on one input is equal or very close to the other

input voltage. Adding hysteresis can prevent this problem.

Hysteresis creates two switching thresholds (one for the rising

input voltage and the other for the falling input voltage). Hys-

teresis is the voltage difference between the two switching

thresholds. When both inputs are nearly equal, hysteresis

causes one input to effectively move quickly past the other.

Thus, moving the input out of the region in which oscillation

may occur.

Hysteresis can easily be added to a comparator in a non-in-

verting configuration with two resistors and positive feedback

Figure 2. The output will switch from low to high when VIN rises

up to VIN1, where VIN1 is calculated by

VIN1 = [VREF(R1+R2)] / R2

The output will switch from high to low when VIN falls to VIN2,

where VIN2 is calculated by

VIN2 = [VREF(R1+R2) – (VCC R1)] / R2

The Hysteresis is the difference between VIN1 and VIN2.

ΔVIN = VIN1 - VIN2

= [VREF(R1+R2) / R2] - [VREF(R1+R2)] - [(VCC R1) / R2]

= VCC R1 / R2

20037026

20037027

FIGURE 2. Non-Inverting Comparator Configuration

INPUT

The LMV761/LMV762 have near zero input bias current. This

allows very high resistance circuits to be used without any

concern for matching input resistances. This also allows the

use of very small capacitors in R-C type timing circuits. This

reduces the cost of the capacitors and amount of board space

used.

SHUTDOWN MODE

The LMV761 features a low-power shutdown pin that is acti-

vated by driving SD low. In shutdown mode, the output is in

a high impedance state, supply current is reduced to 20nA

and the comparator is disabled. Driving SD high will turn the

comparator on. The SD pin should not be left unconnected

due to the fact that it is a high impedance input. When left

unconnected, the output will be at an unknown voltage. Also

do not three-state the SD pin.

The maximum input voltage for SD is 5.5V, referred to ground

and is not limited by VCC. This allows the use of 5V logic to

drive SD while VCC operates at a lower voltage, such as 3V.

The logic threshold limits for SD are proportional to VCC.

BOARD LAYOUT AND BYPASSING

The LMV761/LMV762 is designed to be stable and oscillation

free, but it is still important to include the proper bypass ca-

pacitors and ground pickups. Ceramic 0.1μF capacitors

should be placed at both supplies to provide clean switching.

Minimize the length of signal traces to reduce stray capaci-

tance.

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LMV761/LMV762/LMV762Q

Physical Dimensions inches (millimeters) unless otherwise noted

6-Pin SOT-23

NS Package Number MF06A

8-Pin SOIC

NS Package Number M08A

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LMV761/LMV762/LMV762Q

8-Pin MSOP

NS Package Number MUA08A

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LMV761/LMV762/LMV762Q

Notes

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LMV761/LMV762/LMV762Q

Notes

LMV761/LMV762/LMV762Q Low Voltage, Precision Comparator with Push-Pull Output

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