LMV393-SM1-R [UTC]

DUAL GENERAL PURPOSE, LOW VOLAGE, COMPARATORS; 双路通用型，低VOLAGE ，比较


型号：	LMV393-SM1-R
厂家：	Unisonic Technologies
描述：	DUAL GENERAL PURPOSE, LOW VOLAGE, COMPARATORS 双路通用型，低VOLAGE ，比较
文件：	总11页 (文件大小：340K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

LMV393

LINEAR INTEGRATED CIRCUIT

DUAL GENERAL PURPOSE,

LOW VOLAGE, COMPARATORS

DESCRIPTION

The UTC LMV393 is a low voltage (2.7-5V) version of the dual

comparators. Its noise performance has been improved by using

bipolar differential input and output stages. These comparators also

have a unique characteristic in that the input common-mode voltage

range includes ground even though operated from a single power

supply voltage.

The UTC LMV393 is designed for applications in consumer

automotive, mobile communications, notebooks and PDA’s, battery

powered electronics, General Purpose Portable Device, General

Purpose Low Voltage Applications.

FEATURES

*Pb-free plating product number: LMV393L

* High precision comparator.

* Low operating voltage 2.7-5V.

* Low Supply Current 100μA/Channel (Typical).

* Low Input Bias Current 100nA (Typical).

* Low Input Offset Current 2nA (Typical).

* Input Common Mode Voltage Range Includes Ground.

* Low Output Saturation Voltage 0.2V.

ORDERING INFORMATION

Ordering Number

Package

Packing

Normal

Lead Free Plating

LMV393L-D08-T

LMV393L-S08-R

LMV393L-S08-T

LMV393L-SM1-R

LMV393L-SM1-T

LMV393-D08-T

LMV393-S08-R

LMV393-S08-T

LMV393-SM1-R

LMV393-SM1-T

DIP-8

SOP-8

Tube

Tape Reel

Tube

SOP-8

MSOP-8

Tape Reel

Tube

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LMV393

LINEAR INTEGRATED CIRCUIT

PIN CONFIGUREATION

BLOCK DIAGRAM

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LMV393

LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

V_CC

RATINGS

2.7 ~ 5.0

±V_CC

UNIT

Supply Voltage

Differential Input Voltage

Voltage on any pin (referred to V- pin)

Junction Temperature

V_IN(DIFF)

5.5

T_J

+150

°C

Operating Temperature

T_OPR

T_STG

-40 ~ +85

-65 ~ +150

Storage Temperature

Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL CHARACTERISTICS

PARAMETER

SYMBOL

RATINGS

190

UNIT

MSOP-8

DIP-8

Thermal Resistance Junction to Ambient

θ_JA

℃/W

100

SOP-8

150

DC ELECTRICAL CHARACTERISTICS (T_J=25℃, V^-=0V, unless otherwise specified.)

PARAMETER

SYMBOL

V_IN(OFF)

I_I(OFF)

TEST CONDITIONS

MIN

TYP

1.7

MAX UNIT

Input Offset Voltage

μV/℃

Input Offset Voltage Average Drift

Input Bias Current

I_I(BIAS)

100

250

Input Offset Current

I_I(OFF)

-0.1

4.2

100

Input Voltage Range

V_IN

Supply Current

Voltage Gain

I_CC

G_V

200

400

μA

V/mV

Saturation Voltage

V_SAT

I_SINK≤4mA

V_OUT≤1.5V

200

2.7V

5.0V

Output Sink Current

I_SINK

I_LEAK

Output Leakage Current

0.003

μA

AC ELECTRICAL CHARACTERISTICS (T_J=25℃, R_L=5.1kΩ, V-=0V, unless otherwise specified.)

PARAMETER

SYMBOL

TEST CONDITIONS

Input Overdrive=10mV

MIN

TYP

MAX UNIT

2.7V

5.0V

2.7V

5.0V

2.7V

5.0V

2.7V

5.0V

Propagation Delay

(High to Low)

t_PHL

3.8

3.4

Input Overdrive=100mV

Input Overdrive=10mV

Input Overdrive=100mV

Propagation Delay

(Low to High)

t_PLH

0.7

0.8

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS

Basic Comparator

A basic comparator circuit can convert analog signals to a digital output. The UTC LMV393 needs a pull-up

resistor connected to the positive supply voltage which can make output switch properly. So that when the internal

output transistor is off, the output voltage will be pulled up to the external positive voltage.

The resister should be chosen properly. The higher resister can reduce the power dissipation. the lower resister

can improve the capacity of loading output. The range of resister should between 1k to 10kΩ.

The Output voltage of the comparator will be high if the input voltage at the non-inverting pin is greater than the

reference voltage at the inverting pin. On the other hand it will be low.

Comparator with Hysteresis

The comparator may oscillate or produce a noisy output if the applied differential input voltage is near the

comparator’s offset voltage, especially when the input signal is moving slowly across the comparator’s switching

threshold. Addition of hysteresis or positive feedback can solve this problem.

Inverting Comparator with Hysteresis

It requires a three resistor network that is referenced to the supply voltage V_CCof the comparator. When the output

voltage is high, these resistors can be represented as R1 // R3 in series with R2. The lower set input voltage is

defined as:

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS(Cont.)

When V_IN> V_athe output voltage is low close to ground. It can be presented as R₂// R₃in series with R₁. The

upper trip voltage V_a2is defined as

The total hysteresis provided by the network is defined as:

To assure that the comparator will always switch correctly, the resistors values should be chosen as follow:

R_PULL-UP<< R_LOADand R₁> R_PULL-UP.

Non-Inverting Comparator with Hysteresis

It requires a two resistor network to implement a non inverting comparator with hysteresis and with a voltage

reference at the inverting input. So when V_INis low, the output is also low. If the output will switch from low to high,

V_INmust rise up to V_IN1, and V_IN1can be calculated by:

When V_INis high, the output is also high, in order to make the comparator switch back to low, V_INcan be

calculated by:

The hysteresis of this circuit is the difference between V_IN1and V_{IN 2}

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS(Cont.)

Square Wave Oscillator

Comparators are suitable for oscillator applications. This application uses the minimum number of external

components. The output frequency is set by the RC time constant which is determined by capacitor C1 and the

resistor in the negative feedback R₄of the comparator. Capacitive load at the output would degrade the output slew

rate and limit the maximum operating frequency.

V⁺

-Vcc

4.3k

100k

75pF

Va1

V⁺

Vc1

Va2

VOUT

t = 0

100k

V⁺

100k

OUT

Squarewave Oscillator

At first, assume that the output is high, so the voltage at the inverting input V_Cis less than the voltage at the

non-inverting input Va, the capacitor C₁has to be discharged. When it has charged up to value equal to the positive

input voltage V_a1, the comparator output will switch.

V_a1will be given by:

If: R₁=R₂=R₃

Then:

When the output switches to ground, the value of Va is reset by the resistor network:

Then capacitor C1 discharge through a resistor towards ground. The output will return to its high state when the

voltage across the capacitor has discharged to a value equal to V_a2.The time to charge the capacitor can be

calculated from:

Where V_MAX=2V_CC/3 and V_C= V_CC/3

One period will be given by: 1/freq = 2t or calculating the exponential gives: 1/freq = 2(0.694) R₄C₁Resistors R₃

and R₄must be at least two times larger than R₅to insure a reasonable V_O. The frequency stability of this circuit

should strictly be a function of the external components.

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS(Cont.)

Free Running Multivibrator

This oscillator circuit can generate a train of stable clock for precise timekeeping applications. We can obtain it by

using a resonator as the feedback component. A quartz crystal in its series-resonant mode can make the circuit

oscillating well. For the comparator be switching symmetrically about +V_CC/2, the value of R₁and R₂must choose

equal. The RC time constant of R3 and C₁is set to be several times greater than the period of the oscillating

frequency. When choose crystal, be sure to order series resonant with desired temperature coefficient.

Pulse generator with variable duty cycle:

A pulse generator with variable duty cycle can be obtained by creating two separated paths for C₁charge and

discharge into the basic square wave generator. One path, through R₂and D₂will charge the capacitor and set the

pulse width (t₁). The other path, R₁and D₁will discharge the capacitor and set the time between pulses (t₂).

Varying resistor R₁, R₂can alter the time between pulses and the pulse width. Both controls also change the

frequency of the generator.

The pulse width and time between pulses can be found from:

R₄C₁

V =V_max(1 − e^−t

)

Rise time

Fall time

V =V_maxe^−t

R₅C₁

Where

And

2V_CC

V_max

V_maxV_CC

V =

then

R₄C₁

= e^−t

t₂is then given by:

R₅C₁

= e^−t

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS(Cont.)

V⁺

15k

100k

80pF

-V⁺

6μs

60μs

tot1

V^OUT

V+

*FOR LARGE RATIOS OF R1/R2.

D1 CAN BE OMITTED.

Pulse Generator

At last, we get,

t₁= R₄C₁ln 2

t₂= R₅C₁ln 2

These terms have a slight error because V_maxis not exactly equal to 2/3 V_CCbut is actually reduced by the diode

drop to:

V_max= (V_CC−V_BE)

R₄C₁

= e^−t

2(1−V_BE)

R₅C₁

= e^−t

2(1−V_BE)

And that’s the exact value we get.

t₁= R₄C₁ln 2(1−V_BE)

t₂= R₅C₁ln 2(1−V_BE)

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LMV393

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUITS(Cont.)

Positive Peak Detector:

Positive peak detector is basically the comparator operated as a unit gain follower with a large holding capacitor

from the output to ground. Additional transistor is added to the output to provide a low impedance current source.

When the output of the comparator goes high, current is passed through the transistor to charge up the capacitor.

The only discharge path will be the 1M ohm resistor shunting C1 and any load that is connected to the output. The

decay time can be altered simply by changing the 1MΩ resistor. The output should be used through a high

impedance follower to a avoid loading the output of the peak detector.

Negative Peak Detector:

For the negative detector, the output transistor of the comparator acts as a low impedance current sink. The only

discharge path will be the 1MΩ resistor and any load impedance used. Decay time is changed by varying the 1MΩ

resistor.

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LMV393

LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS

Output Voltage vs Output Current at 5V Supply

Output Voltage vs Output Current at 2.7 Supply

1700

1600

1500

1400

1300

1200

1100

1000

700

600

500

400

300

+85℃

+25℃

900

800

700

600

500

400

300

200

100

200

100

Output Current (mA)

Response Time vs Input Overdrives Negative

Transition

Input Bias Current vs Supply Voltage

VIN=0V

250

200

150

100

10mV

100mV

20m

+25℃

Vcc=5V

Ta=25℃

RL=5.1kΩ

+85℃

100

Overdrive

0.5

2.5

3.5

4.5

5.5

1.5

2.5

Supply Voltage (V)

Time (μs)

Response Time vs Input Overdrives Negative

Transition

Response Time for Input Overdrive Positive Transition

Vcc=5V

Ta=25℃

100m

10mV

100mV

RL=5.1kΩ

5mV

20mV

Vcc=2.7V

Ta=25℃

RL=5.1kΩ

Overdrive

100

-100

Overdrive

0.5

Time (μs)

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LMV393

LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS (Cont.)

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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LMV393-SM1-R [UTC]

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