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PDF LM2903E Data sheet ( Hoja de datos )
| Número de pieza | LM2903E | |
| Descripción | Low Offset Voltage Dual Comparators | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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LM393, LM393E, LM293,
LM2903, LM2903E, LM2903V,
NCV2903, NCV2903V
Low Offset Voltage
Dual Comparators
The LM393 series are dual independent precision voltage
comparators capable of single or split supply operation. These devices
are designed to permit a common mode range−to−ground level with
single supply operation. Input offset voltage specifications as low as
2.0 mV make this device an excellent selection for many applications
in consumer, automotive, and industrial electronics.
Features
• Wide Single−Supply Range: 2.0 Vdc to 36 Vdc
• Split−Supply Range: ±1.0 Vdc to ±18 Vdc
• Very Low Current Drain Independent of Supply Voltage: 0.4 mA
• Low Input Bias Current: 25 nA
• Low Input Offset Current: 5.0 nA
• Low Input Offset Voltage: 5.0 mV (max) LM293/393
• Input Common Mode Range to Ground Level
• Differential Input Voltage Range Equal to Power Supply Voltage
• Output Voltage Compatible with DTL, ECL, TTL, MOS, and CMOS
Logic Levels
• ESD Clamps on the Inputs Increase the Ruggedness of the Device
without Affecting Performance
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
VCC + Input
- Input
Output
R2
2.1 k
Q4
R4
Q3
Q5
2.0 k
Q6
F1
Q14
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8
1
8
1
8
1
PDIP−8
N SUFFIX
CASE 626
SOIC−8
D SUFFIX
CASE 751
Micro8E
DM SUFFIX
CASE 846A
PIN CONNECTIONS
Output A 1
2−
Inputs A 3 +
GND 4
8 VCC
7 Output B
−6
+5
Inputs B
(Top View)
DEVICE MARKING AND ORDERING
INFORMATION
See detailed marking information and ordering and shipping
information on pages 6 and 7 of this data sheet.
Q10
Q1
Q9
Q8
Q2
R1
4.6 k
Q11
Q16
Q12
Q15
Figure 1. Representative Schematic Diagram
(Diagram shown is for 1 comparator)
© Semiconductor Components Industries, LLC, 2015
October, 2015 − Rev. 28
1
Publication Order Number:
LM393/D
1 page  
LM393, LM393E, LM293, LM2903, LM2903E, LM2903V, NCV2903, NCV2903V
APPLICATIONS INFORMATION
These dual comparators feature high gain, wide
bandwidth characteristics. This gives the device oscillation
tendencies if the outputs are capacitively coupled to the
inputs via stray capacitance. This oscillation manifests
itself during output transitions (VOL to VOH). To alleviate
this situation, input resistors < 10 kW should be used.
+15 V
The addition of positive feedback (< 10 mV) is also
recommended. It is good design practice to ground all
unused pins.
Differential input voltages may be larger than supply
voltage without damaging the comparator’s inputs. Voltages
more negative than −0.3 V should not be used.
R1
8.2 k
Vin R1
D1
R4
220 k
6.8 k
R2
R5
220 k
*
LM393
)
10 k
15 k 10 m
R3
D1 prevents input from going negative by more than 0.6 V.
R1 + R2 = R3
R3 ≤
R5
10
for small error in zero crossing.
Figure 8. Zero Crossing Detector
(Single Supply)
Vin Vin(min)
+VCC
Q
* 10 k
Vin
LM393
)
VCC
-VEE
VO
- VEE
DQ
Vin(min) [ 0.4 V peak for 1% phase distortion (DQ).
Q
Figure 9. Zero Crossing Detector
(Split Supply)
1.0 mW
VCC
51 k
-
0.001 mF LM393
+
VCC
RL
10 k
VO
51 k VCC
51 k
VO
0
t
Figure 10. Free−Running Square−Wave Oscillator
VCC VCC
t
+
LM393
- VC
R
C
``ON'' for t tO + Dt
where:
Dt = RC ȏ n (
Vref
VCC
)
-
LM393
+
RL
VO
+ Vref
Vin Vref
0
VO
0
VC Vref
0
tO ȏ
Figure 11. Time Delay Generator
t
RS
R1
Vref
-
LM393
+
R2
VCC
RL
RS = R1 | | R2
Vth1 = Vref +
Vth2 = Vref -
(VCC -Vref) R1
R1 + R2 + RL
(Vref -VO Low) R1
R1 + R2
Figure 12. Comparator with Hysteresis
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM2903E.PDF ] | |
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