Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Comparator Multi-purpose CMOS, Push pull, Rail-to-rail SC 70 5

REF

OUT

C1 =

0.1µF

C2 =

10µF

LMV7291

www.ti.com

SNOSA86E –FEBRUARY 2004–REVISED MARCH 2013

LMV7291 Single 1.8V Low Power Comparator with Rail-to-Rail Input

Check for Samples: LMV7291

FEATURES

DESCRIPTION

The LMV7291 is a rail-to-rail input low power

• (V

= 1.8V, T

= 25°C, Typical

comparator, characterized at supply voltage 1.8V,

Values unless Specified)

2.7V and 5.0V. It consumes only 9uA supply current

• Single Supply

per channel while achieving a 800ns propagation

• Ultra Low Supply Current 9µA per Channel

delay.

• Low Input Bias Current 10nA

The LMV7291 is available in SC70 package. With this

tiny package, the PC board area can be significantly

• Low Input Offset Current 200pA

reduced. It is ideal for low voltage, low power and

• Low ensured V

4mV

space critical designs.

• Propagation Delay 880ns (20mV Overdrive)

The LMV7291 features a push-pull output stage

• Input Common Mode Voltage Range 0.1V

which allows operation with minimum power

beyond Rails

consumption when driving a load.

The LMV7291 is built with Texas Instruments'

APPLICATIONS

advance submicron silicon-gate BiCMOS process. It

• Mobile Communications

has bipolar inputs for improved noise performance

• Laptops and PDA's

and CMOS outputs for rail-to-rail output swing.

• Battery Powered Electronics

• General Purpose Low Voltage Applications

Typical Circuit

Figure 1. Threshold Detector

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 LMV7291 Single 1.8V Low Power Comparator with Rail-to-Rail Input Check for Samples: LMV7291 FEATURES DESCRIPTION • The LMV7291 is a rail-to-rail input low power comparator, characterized at supply voltage 1.8V, 2.7V and 5.0V. It consumes only 9uA supply current per channel while achieving a 800ns propagation delay. 1 2 • • • • • • • (VS = 1.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 Absolute Maximum Ratings www.ti.com (1) (2) ESD Tolerance VIN Differential 2KV (3) 200V (4) ±Supply Voltage Supply Voltage (V+ - V−) 5.5V V+ +0.1V, V− −0.1V Voltage at Input/Output pins Soldering Information Infrared or Convection (20 sec.) 235°C Wave Soldering (10 sec.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 1.8V Electrical Characteristics Unless otherwise specified, all limits ensured for TJ = 25°C, V+ = 1.8V, V− = 0V. Boldface limits apply at the temperature extremes. (1) Symbol Parameter Condition Min (2) Typ (3) Max (2) Units 0.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com 2.7V Electrical Characteristics Unless otherwise specified, all limits ensured for TJ = 25°C, V+ = 2.7V, V− = 0V. Boldface limits apply at the temperature extremes. (1) Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units 0.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 5V Electrical Characteristics Unless otherwise specified, all limits ensured for TJ = 25°C, V+ = 5V, V− = 0V. Boldface limits apply at the temperature extremes. (1) Symbol Parameter Conditions Min (2) Typ (3) Max (2) Units 0.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com Connection Diagram 1 5 VOUT + V 2 GND 3 4 +IN -IN Figure 2.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 Typical Performance Characteristics (TA = 25°C, Unless otherwise specified). VOS vs. VCM VOS vs. VCM VSUPPLY = ±0.9V 800 800 VSUPPLY = ±1.35V -40°C -40°C 400 400 VOS (PV) VOS (PV) 25°C 0 0 85°C -400 -400 25°C 85°C -800 -800 -0.9 -0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7 0.9 0 0.45 VOS vs. VCM Short Circuit vs. Supply Voltage SHORT CIRCUIT OUTPUT CURRENT (mA) Figure 4. -40°C VOS (PV) -0.45 Figure 3.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = 25°C, Unless otherwise specified). Supply Current vs. Supply Voltage Output Positive Swing vs. VSUPPLY 600 25 500 V - VOUT (mV) 15 10 25°C + SUPPLY CURRENT (PA) ISOURCE 85°C 20 -40°C 400 4mA 300 2mA 200 1.5mA 5 100 0.5mA VOUT = LOW 0 0 1.5 2 2.5 3 3.5 4 1.8 5 4.5 2.3 2.8 3.3 3.8 4.3 4.8 VSUPPLY (V) VSUPPLY (V) Figure 9. Figure 10.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 Typical Performance Characteristics (continued) (TA = 25°C, Unless otherwise specified). Output Negative Swing vs. ISINK Output Negative Swing vs. ISINK 0.5 0.4 VSUPPLY = 2.7V 0.45 VSUPPLY = 5V 85°C 85°C 0.4 25°C - 0.3 VOUT - V (V) - VOUT - V (V) 0.3 0.35 25°C 0.25 0.2 0.2 0.15 0.1 0.1 -40°C -40°C 0.05 0 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 Figure 15. OUTPUT VOLTAGE (V) VSUPPLY = 5V 85°C 3.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) (TA = 25°C, Unless otherwise specified). Propagation Delay (tPLH) VCC = 2.7 V TEMP = 25°C LOAD = 5k: 50pF 4 3 2 50mV 1 5 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Propagation Delay (tPHL) 5 20mV VCC = 5.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 APPLICATION NOTES BASIC COMPARATOR A comparator is often used to convert an analog signal to a digital signal. As shown in Figure 26, the comparator compares an input voltage (VIN) to a reference voltage (VREF). If VIN is less than VREF, the output (VO) is low. However, if VIN is greater than VREF, the output voltage (VO) is high. V VREF + VOLTS VO VO VIN + VREF V - TIME VIN Figure 26.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 VA1 = www.ti.com VCC R2 (R1||R3) + R2 (1) When VIN is greater than VA (VIN > VA), the output voltage is low and very close to ground. In this case the three network resistors can be presented as R2//R3 in series with R1. The upper trip voltage VA2 is defined as VA2 = VCC (R2||R3) R1 + (R2||R3) (2) The total hysteresis provided by the network is defined as ΔVA = VA1 - VA2 (3) A good typical value of ΔVA would be in the range of 5 to 50 mV.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 When VIN is high, the output is also high. To make the comparator switch back to its low state, VIN must equal VREF before VA will again equal VREF. VIN can be calculated by: (5) The hysteresis of this circuit is the difference between VIN1 and VIN2. ΔVIN = VCCR1/R2 (6) Figure 28.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com 5. When the signal source is applied through a resistive network to one input of the comparator, it is usually advantageous to connect the other input with a resistor with the same value, for both DC and AC consideration. Input traces should be laid out symmetrically if possible. 6. All pins of any unused comparators should be tied to the negative supply.
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LMV7291 www.ti.com SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 R4 = 100 k: C1 = 750 pF VC VO + R1 = 100 k: V + VA R3 = 100 k: + R2 = 100 k: V 0 f | 10 kHz Figure 31. Squarewave Oscillator To analyze the circuit, consider it when the output is high. That implies that the inverted input (VC) is lower than the non-inverting input (VA). This causes the C1 to get charged through R4, and the voltage VC increases till it is equal to the non-inverting input. The value of VA at this point is VCC.
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LMV7291 SNOSA86E – FEBRUARY 2004 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision D (March 2013) to Revision E • 16 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMV7291MG SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 LMV7291MG/NOPB SC70 DCK 5 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 LMV7291MGX/NOPB SC70 DCK 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMV7291MG SC70 DCK 5 1000 210.0 185.0 35.0 LMV7291MG/NOPB SC70 DCK 5 1000 210.0 185.0 35.0 LMV7291MGX/NOPB SC70 DCK 5 3000 210.0 185.0 35.
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