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PDF LM2903D Data sheet ( Hoja de datos )
| Número de pieza | LM2903D | |
| Descripción | SINGLE SUPPLY/ LOW POWER DUAL COMPARATORS | |
| Fabricantes | Motorola Inc | |
| Logotipo |  |
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1. LM2903D  Hay una vista previa y un enlace de descarga de LM2903D (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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Order this document by LM393/D
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.
• 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: 2.0 mV (max) LM393A
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
LM393, LM393A,
LM293, LM2903,
LM2903V
SINGLE SUPPLY, LOW POWER
DUAL COMPARATORS
SEMICONDUCTOR
TECHNICAL DATA
8
1
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Representative Schematic Diagram
(Diagram shown is for 1 comparator)
VCC + Input
– Input
Output
R2
2.1 k
Q4
R4
Q3
Q5
2.0 k
Q6
F1
Q14
Q10
Q1
Q9
Q8
Q2
R1
4.6 k
Q11
Q16
Q12
Q15
MOTOROLA ANALOG IC DEVICE DATA
PIN CONNECTIONS
Output A 1
2–
Inputs A 3 +
Gnd 4
8 VCC
7 Output B
–6
+5
Inputs B
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
LM293D
TA = –25° to +85°C
LM393D
TA = 0° to +70°C
LM393AN,N
LM2903D
LM2903N
LM2903VD
LM2903VN
TA = –40° to +105°C
TA = –40° to +105°C
Package
SO–8
SO–8
Plastic DIP
SO–8
Plastic DIP
SO–8
Plastic DIP
© Motorola, Inc. 1996
Rev 1
1
1 page  
LM393, LM393A, LM293, LM2903, LM2903V
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 kΩ should be used.
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.
Figure 7. Zero Crossing Detector
(Single Supply)
+15 V
R1 R4 R5
8.2 k
*Vin R1
)D1
220 k
6.8 k
R2
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
(Split Supply)
Vin Vin(min)
+VCC
Θ
* 10 k
)Vin LM393
VCC
–VEE
VO
– VEE
∆Θ
[Vin(min) 0.4 V peak for 1% phase distortion (∆Θ).
Θ
Figure 9. Free–Running Square–Wave Oscillator
1.0 MΩ
VCC
Figure 10. Time Delay Generator
VCC VCC
VCC
51 k
–
0.001 µF LM393
+
RL
10 k
VO
t
–
LM393
+ VC
R
C
–
LM393
+
RL
VO
51 k VCC
51 k
VO
0
t
‘‘ON’’ for t tO + ∆t
where:
ȏ∆t = RC
n
(
Vref
VCC
)
+ Vref
Vin Vref
0
VO
0
VC Vref
ȏ0
tO
Figure 11. Comparator with Hysteresis
VCC
RS
R1
Vref
–
LM393
+
R2
RS = R1 | | R2
RL
Vth1
=
Vref
+
(VCC –Vref) R1
R1 + R2 + RL
Vth2 = Vref –
(Vref –VO Low) R1
R1 + R2
t
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LM2903D.PDF ] | |
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