Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Comparator Multi-purpose CMOS, Push pull, Rail-to-rail SOT 23 5

REF

OUT

C1 =

0.1µF

C2 =

10µF

LMV7271

www.ti.com

SNOSA56H –FEBRUARY 2003–REVISED FEBRUARY 2013

LMV7271/LMV7275/LMV7272 Single & Dual, 1.8V Low Power Comparators with Rail-to-Rail

Input

Check for Samples: LMV7271

FEATURES

DESCRIPTION

The LMV727X are rail-to-rail input low power

• (V

= 1.8V, T

= 25°C, Typical values unless

comparators, which are characterized at supply

specified).

voltage 1.8V, 2.7V and 5.0V. They consume only 9uA

• Single or Dual Supplies

supply current per channel while achieving a 800ns

• Ultra low supply current 9µA per channel

propagation delay.

• Low input bias current 10nA

The LMV7271/LMV7275 (single) are available in

SC70 and SOT-23 packages. The LMV7272 (dual) is

• Low input offset current 200pA

available in DSBGA package. With these tiny

• Low guaranteed V

4mV

packages, the PC board area can be significantly

• Propagation delay 880ns (20mV overdrive)

reduced. They are ideal for low voltage, low power

• Input common mode voltage range 0.1V

and space critical designs.

beyond rails

The LMV7271/LMV7272 both feature a push-pull

• LMV7272 is available in DSBGA package

output stage which allows operation with minimum

power consumption when driving a load. The

APPLICATIONS LMV7275 features an open drain output stage that

allows for wired-OR configurations. The open drain

• Mobile communications

output also offers the advantage of allowing the

• Laptops and PDA's

output to be pulled to any voltage up to 5.5V,

regardless of the supply voltage of the LMV7275.

• Battery powered electronics

• General purpose low voltage applications

The LMV727X are built with Texas Instruments'

advance submicron silicon-gate BiCMOS process.

They all have bipolar inputs for improved noise

performance and CMOS outputs for rail-to-rail output

swing.

Typical Circuit

Figure 1. Threshold Detector

Part Number Single/Dual Package Output

LMV7271 Single SC70, SOT-23 Push/Pull

LMV7272 Dual DSBGA Push/Pull

LMV7275 Single SC70, SOT-23 Open Drain

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 (29 pages)

PAGE 1
LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 LMV7271/LMV7275/LMV7272 Single & Dual, 1.8V Low Power Comparators with Rail-to-Rail Input Check for Samples: LMV7271 FEATURES DESCRIPTION • The LMV727X are rail-to-rail input low power comparators, which are characterized at supply voltage 1.8V, 2.7V and 5.0V. They consume only 9uA supply current per channel while achieving a 800ns propagation delay. 1 2 • • • • • • • • (VS = 1.8V, TA = 25°C, Typical values unless specified).
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com 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. Absolute Maximum Ratings (1) (2) ESD Tolerance VIN Differential 2KV (3) 200V (4) ±Supply Voltage Supply Voltage (V+ - V−) 6V V+ +0.1V, V− −0.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 1.8V Electrical Characteristics (continued) Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 1.8V, V− = 0V. Boldface limits apply at the temperature extremes. Symbol ISC Min Typ 3.5 6 4 6 IO = 0.5mA 1.7 1.74 IO = 1.5mA 1.47 1.63 Parameter Output Short Circuit Current Condition Sourcing, VO = 0.9V (LMV7271/LMV7272 only) Sinking, VO = 0.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com 2.7V Electrical Characteristics (continued) Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 2.7V, V− = 0V. Boldface limits apply at the temperature extremes. Symbol Min Typ IO = 0.5mA 2.63 2.66 IO = 2.0mA 2.48 2.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 5.0V Electrical Characteristics (continued) Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5V, V− = 0V. Boldface limits apply at the temperature extremes. Symbol Parameter Min Conditions Typ (1) Max (2) (1) IO = −0.5mA 27 70 IO = −4.0mA 225 315 Units VOL Output Voltage Low mV VCM Input Common Voltage Range CMRR > 45dB CMRR Common Mode Rejection Ratio 0 < VCM < 5.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, Unless otherwise specified). VOS vs. VCM 800 VOS vs. VCM VSUPPLY = ±0.9V 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 -1.35 -0.9 -0.45 VCM (V) Figure 4. Figure 5. VOS vs. VCM Short Circuit vs. Supply Voltage VSUPPLY = ±2.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) (TA = 25°C, Unless otherwise specified). Supply Current vs. Supply Voltage (LMV7271) Supply Current vs. Supply Voltage (LMV7272) 25 10 9 SUPPLY CURRENT (PA) SUPPLY CURRENT (PA) 85°C 85°C 85°C 8 25°C 7 6 20 15 25°C 10 -40°C 5 -40°C VOUT = HIGH 0 5 1.8 2.44 3.08 3.72 4.36 1.5 5.0 2 2.5 3 3.5 4 5 4.5 VSUPPLY (V) SUPPLY VOLTAGE (V) Figure 8. Figure 9.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (TA = 25°C, Unless otherwise specified). Output Negative Swing vs. VSUPPLY Output Positive Swing vs. ISOURCE 600 0.8 VSUPPLY = 1.8V ISINK 0.7 500 85°C V - VOUT (V) 400 4mA - VOUT - V (mV) 0.6 300 25°C 0.4 + 2mA 0.5 200 0.3 1.5mA 0.2 -40°C 100 0.1 0.5mA 0 0 1.8 2.3 2.8 3.3 3.8 4.3 4.8 0 0.5 1 1.5 2 2.5 3 3.5 4 ISOURCE (mA) VSUPPLY (V) Figure 12.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 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 0.35 25°C - 0.3 VOUT - V (V) - VOUT - V (V) 0.3 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 16. 2.5 3 3.5 4 Figure 17.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (TA = 25°C, Unless otherwise specified). Propagation Delay (tPLH) VCC = 1.8 V 4 TEMP = 25°C 3 LOAD = 5k: 50pF 2 50mV 1 5 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) Propagation Delay (tPHL) 5 20mV 3 50mV 2 20mV 1 0 | | 100 OVERDRIVE 0 -100 0 500 1000 1500 INPUT VOLTAGE (mV) 0 INPUT VOLTAGE (mV) VCC = 2.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) (TA = 25°C, Unless otherwise specified). tPLH vs. Overdrive 5 VS = 5V 4.5 4 tPLH (PS) 3.5 3 2.5 VS = 2.7V 2 1.5 1 VS = 1.8V 0.5 0 1 10 100 1000 OVERDRIVE (mV) Figure 26.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com APPLICATION NOTES BASIC COMPARATOR A comparator is often used to convert an analog signal to a digital signal. As shown in Figure 28, 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. Figure 27. LMV7271 V VREF + VO VIN + V - VOLTS VO VREF TIME VIN Figure 28.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 HYSTERESIS It is a standard procedure to use hysteresis (positive feedback) around a comparator, to prevent oscillation, and to avoid excessive noise on the output because the comparator is a good amplifier of its own noise. Inverting Comparator with Hysteresis The inverting comparator with hysteresis requires a three resistor network that is referenced to the supply voltage VCC of the comparator (Figure 29).
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com Figure 29. Inverting Comparator with Hysteresis Non-Inverting Comparator with Hysteresis A non-inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the inverting input (Figure 30). When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up to VIN1, where VIN1 is calculated by (4) When VIN is high, the output is also high.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 Figure 30. Non-Inverting Comparator with Hysteresis CIRCUIT TECHNIQUES FOR AVOIDING OSCILLATIONS IN COMPARATOR APPLICATIONS Feedback to almost any pin of a comparator can result in oscillation. In addition, when the input signal is a slow voltage ramp or sine wave, the comparator may also burst into oscillation near the crossing point. To avoid oscillation or instability, PCB layout should be engineered thoughtfully.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com V + OUT B OUT A -INA -INB +INA +INB V - Figure 31. Typical PCB Layout 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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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 VB VA LOGIC IN REXT - 1k: LOGIC OUT LMV7275 + 1k: Figure 33. Logic Level Shifter POSITIVE PEAK DETECTOR A positive peak detect circuit is basically a comparator operated in a unity gain follower configuration, with a capacitor as a load to maintain the highest voltage.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com Figure 35. OR’ing the Outputs NEGATIVE PEAK DETECTOR For the negative detector, the output transistor of the comparator acts as a low impedance current sink. Since there is no pull-up resistor, the only discharge path will be the 1MΩ resistor and any load impedance used. Decay time is changed by varying the 1MΩ resistor. +VCC VIN + VOUT - R1 1M: + C1 10PF -VCC Figure 36.
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LMV7271 www.ti.com SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 + V 4.3k: R4 = 100k: C1 = 750pF VC VO + R1 = 100k: VA R3 = 100k: + R2 = 100k: V 0 f | 10KHz Figure 37. 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.
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LMV7271 SNOSA56H – FEBRUARY 2003 – REVISED FEBRUARY 2013 www.ti.com REVISION HISTORY Changes from Revision G (February 2013) to Revision H • 20 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 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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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) LMV7271MF SOT-23 DBV 5 1000 178.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 LMV7271MF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LMV7271MFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 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) LMV7271MF SOT-23 DBV 5 1000 210.0 185.0 35.0 LMV7271MF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMV7271MFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMV7271MG SC70 DCK 5 1000 210.0 185.0 35.0 LMV7271MG/NOPB SC70 DCK 5 1000 210.0 185.0 35.0 LMV7271MGX/NOPB SC70 DCK 5 3000 210.0 185.0 35.
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MECHANICAL DATA YZR0008xxx D 0.600±0.075 E TLA08XXX (Rev C) D: Max = 1.55 mm, Min = 1.489 mm E: Max = 1.55 mm, Min = 1.489 mm 4215045/A NOTES: A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994. B. This drawing is subject to change without notice. www.ti.
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