LMV393-S08-T [UTC]
DUAL GENERAL PURPOSE, LOW VOLAGE, COMPARATORS; 双路通用型,低VOLAGE ,比较型号: | LMV393-S08-T |
厂家: | Unisonic Technologies |
描述: | DUAL GENERAL PURPOSE, LOW VOLAGE, COMPARATORS |
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
MSOP-8
Tape Reel
Tube
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Copyright © 2005 Unisonic Technologies Co., Ltd
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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
VCC
RATINGS
2.7 ~ 5.0
±VCC
UNIT
V
Supply Voltage
Differential Input Voltage
Voltage on any pin (referred to V- pin)
Junction Temperature
VIN(DIFF)
V
5.5
V
TJ
+150
°C
°C
°C
Operating Temperature
TOPR
TSTG
-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
θJA
℃/W
100
SOP-8
150
DC ELECTRICAL CHARACTERISTICS (TJ=25℃, V-=0V, unless otherwise specified.)
PARAMETER
SYMBOL
VIN(OFF)
II(OFF)
TEST CONDITIONS
MIN
TYP
1.7
5
MAX UNIT
Input Offset Voltage
7
mV
μV/℃
nA
Input Offset Voltage Average Drift
Input Bias Current
II(BIAS)
100
2
250
50
Input Offset Current
II(OFF)
nA
-0.1
4.2
100
50
Input Voltage Range
VIN
V
Supply Current
Voltage Gain
ICC
GV
200
400
μA
V/mV
mV
20
Saturation Voltage
VSAT
ISINK ≤4mA
VOUT ≤1.5V
200
40
2.7V
5.0V
5
Output Sink Current
ISINK
ILEAK
mA
10
50
Output Leakage Current
0.003
1
μA
AC ELECTRICAL CHARACTERISTICS (TJ=25℃, RL=5.1kΩ, V-=0V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
Input Overdrive=10mV
MIN
TYP
9
MAX UNIT
2.7V
5.0V
2.7V
5.0V
2.7V
5.0V
2.7V
5.0V
Propagation Delay
(High to Low)
8
tPHL
us
3.8
3.4
2
Input Overdrive=100mV
Input Overdrive=10mV
Input Overdrive=100mV
Propagation Delay
(Low to High)
3
tPLH
us
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 VCC of 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 VIN > Va the output voltage is low close to ground. It can be presented as R2 // R3 in series with R1. The
upper trip voltage Va2 is 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:
RPULL-UP << RLOAD and R1 > RPULL-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 VIN is low, the output is also low. If the output will switch from low to high,
VIN must rise up to VIN1, and VIN1 can be calculated by:
When VIN is high, the output is also high, in order to make the comparator switch back to low, VIN can be
calculated by:
The hysteresis of this circuit is the difference between VIN1 and VIN 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 R4 of the comparator. Capacitive load at the output would degrade the output slew
rate and limit the maximum operating frequency.
V+
-Vcc
R4
4.3k
100k
C1
75pF
Va1
V+
0
Vc1
-
Va2
Vc
VOUT
t = 0
+
R1
100k
R3
100k
Va
V+
R2
T
100k
V
OUT
0
Squarewave Oscillator
At first, assume that the output is high, so the voltage at the inverting input VC is less than the voltage at the
non-inverting input Va, the capacitor C1 has to be discharged. When it has charged up to value equal to the positive
input voltage Va1, the comparator output will switch.
Va1 will 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 Va2.The time to charge the capacitor can be
calculated from:
Where VMAX =2VCC/3 and VC = VCC/3
One period will be given by: 1/freq = 2t or calculating the exponential gives: 1/freq = 2(0.694) R4 C1Resistors R3
and R4 must be at least two times larger than R5 to insure a reasonable VO. 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 +VCC/2, the value of R1 and R2 must choose
equal. The RC time constant of R3 and C1 is 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 C1 charge and
discharge into the basic square wave generator. One path, through R2 and D2 will charge the capacitor and set the
pulse width (t1). The other path, R1 and D1 will discharge the capacitor and set the time between pulses (t2).
Varying resistor R1, R2 can 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 =Vmax (1 − e−t
)
Rise time
Fall time
1
1
V =Vmaxe−t
R5C1
2
1
Where
And
2VCC
Vmax
=
3
Vmax VCC
V =
=
1
3
3
then
1
R4C1
= e−t
1
2
t2 is then given by:
1
R5C1
= e−t
2
2
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LMV393
LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUITS(Cont.)
V+
15k
R1
1M
D1
*
R2
100k
D2
C1
80pF
-
-V+
0
6μs
60μs
t2
tot1
R5
1M
VOUT
+
V+
R3
1M
R4
1M
*FOR LARGE RATIOS OF R1/R2.
D1 CAN BE OMITTED.
Pulse Generator
At last, we get,
t1 = R4C1 ln 2
t2 = R5C1 ln 2
These terms have a slight error because Vmax is not exactly equal to 2/3 VCC but is actually reduced by the diode
drop to:
2
Vmax = (VCC −VBE )
3
1
R4C1
= e−t
1
2(1−VBE )
1
R5C1
= e−t
2
2(1−VBE )
And that’s the exact value we get.
t1 = R4C1 ln 2(1−VBE )
t2 = R5C1 ln 2(1−VBE )
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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℃
+85℃
+25℃
+25℃
900
800
700
600
500
400
300
200
100
0
200
100
0
0
5
10
15
20
0
10
20
30
40
50
Output Current (mA)
Output Current (mA)
Response Time vs Input Overdrives Negative
Transition
Input Bias Current vs Supply Voltage
VIN=0V
250
200
150
100
50
5
4
3
2
1
10mV
100mV
20m
V
+25℃
Vcc=5V
Ta=25℃
RL=5.1kΩ
+85℃
0
~
~
~
~
100
5
0
Overdrive
0.5
0
2.5
3.5
4.5
5.5
0
1
1.5
2
2.5
3
Supply Voltage (V)
Time (μs)
Response Time vs Input Overdrives Negative
Transition
Response Time for Input Overdrive Positive Transition
3
2
Vcc=5V
Ta=25℃
5
4
3
2
1
100m
10mV
V
100mV
RL=5.1kΩ
5mV
20mV
20mV
1
0
Vcc=2.7V
Ta=25℃
RL=5.1kΩ
0
~
~
Overdrive
~
100
~
~
~
~
~
0
-100
0
Overdrive
1.
0
3
6
9
12
0
0.5
1
2
5
Time (μs)
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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