ST LM2903W User Manual

Features
supplies +2 V to +36 V or ±1 V to ±18 V
Very low supply current (0.4 mA) independent
of supply voltage (1 mW/comparator at +5 V)
Low input bias current: 25 nA typ.
Low input offset current: ±5 nA typ.
Input common-mode voltage range includes
negative rail
Low output saturation voltage:
250 mV typ. (I
Differential input voltage range equal to the
supply voltage
TTL, DTL, ECL, MOS, CMOS compatible
outputs
ESD internal protection: 2 kV
= 4 mA)
O
LM2903W
Low-power dual voltage comparator
Preliminary data
D
SO-8
(Plastic micropackage)
Pin connections (top view)
Description
This device consists of two independent low­power voltage comparators designed specifically to operate from a single supply over a wide range of voltages. Operation from split power supplies is also possible.
The input common-mode voltage range includes the negative rail even though operated from a single power supply voltage.
All the pins are protected against electrostatic discharge up to 2 kV. As a consequence, the input voltages must not exceed the magnitude of V
-
CC
.
or V
CC
+
1 - Output 1 2 - Inverting input 1 3 - Non-inverting input 1 4 - V
CC
-
5 - Non-inverting input 2 6 - Inverting input 2 7 - Output 2 8 - V
CC
+
January 2012 Doc ID 022662 Rev 1 1/13
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
www.st.com
13
Schematic diagram LM2903W

1 Schematic diagram

Figure 1. Schematic diagram (1/2 LM2903W)

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2/13 Doc ID 022662 Rev 1
LM2903W Absolute maximum ratings and operating conditions

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit
V
CC
V
id
V
in
V
out
R
thja
R
thjc
T
j
T
stg
ESD
1. Short-circuits from the output to V maximum output current is approximately 20 mA, independent of the magnitude of V
2. Short-circuits can cause excessive heating and destructive dissipation. Values are typical.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating.
5. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.

Table 2. Operating conditions

Supply voltage ±18 to 36 V
Differential input voltage
Input voltage
V
CC
-
-0.3 to V
+
+0.3 V
CC
Output voltage 36 V
Output short-circuit to ground
Thermal resistance junction to ambient
SO-8
Thermal resistance junction to case
SO-8 40
(1)
(2)
(2)
Infinite
125
°C/W
°C/W
Maximum junction temperature +150 °C
Storage temperature range -65 to +150 °C
Human body model (HBM)
Machine model (MM)
CDM: charged device model
CC
(3)
(4)
(5)
+
can cause excessive heating and possible destruction. The
2000 V
200 V
1500 V
+
.
CC
Symbol Parameter Value Unit
V
T
icm
oper
Common mode input voltage range
≤ T
T
min
amb
≤ T
max
0 to V
0 to V
Operating free-air temperature range -40 to +125 °C
CC
CC
+
-1.5
+
-2
V
Doc ID 022662 Rev 1 3/13
Electrical characteristics LM2903W

3 Electrical characteristics

Table 3. V
CC
+
= 5 V, V
Symbol Parameter Min. Typ. Max. Unit
V
I
I
A
Input offset voltage
io
≤ T
T
min
Input offset current
io
≤ T
T
min
Input bias current
ib
T
≤ T
min
Large signal voltage gain
vd
= 15 V, RL = 15 kΩ, Vo = 1 to 11 V
V
CC
amb
amb
amb
Supply current (all comparators)
I
V
V
I
I
sink
t
CC
id
OL
OH
res
= 5 V, no load
V
CC
= 30 V, no load
V
CC
Differential input voltage
Low level output voltage (Vid = -1 V, I
≤ T
T
min
amb
High level output current (V
≤ T
T
min
amb
≤ T
Output sink current (Vid = -1 V, Vo = 1.5 V) 6 16 mA
Small signal response time
Large signal response time
rel
TTL input (V
Output signal at 50% of final value
t
ref
Output signal at 95% of final value
1. At output switch point, VO 1.4 V, RS = 0 Ω with V (0 V to V
2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the output, so no loading charge exists on the reference of input lines.
3. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than –0.3 V (or 0.3 V below the negative power supply, if used).
4. The response time specified is for a 100 mV input step with 5 mV overdrive.
5. Maximum values are guaranteed by design and evaluation.
CC
+
–1.5 V).
-
≤ T
≤ T
≤ T
≤ T
max
= GND, T
CC
(1)
max
max
(2)
max
max
(3)
CC
(4)
(5)
= 25°C (unless otherwise specified)
amb
sink
= Vo = 30 V, Vid = 1 V)
(RL = 5.1 kΩ to V
= +1.4 V, RL = 5.1 kΩ to V
17
15
550
150
25 250
400
25 200 V/mV
0.4
= 4 mA)
1
250 400
V
2.5
CC
700
0.1
+
)1.3µs
CC
+
)
CC
500
+
from 5 V to 30 V, and over the full input common-mode range
CC
mV
nA
nA
1
+
mA
V
mV
nA
1
µA
ns
1
µs
4/13 Doc ID 022662 Rev 1
LM2903W Electrical characteristics
Figure 2. Supply current vs. supply voltage Figure 3. Input current vs. supply voltage
Figure 4. Output saturation voltage vs.
output current
Figure 5. Response time for various input
overdrives - negative transition
Figure 6. Response time for various input
overdrives - positive transition
Doc ID 022662 Rev 1 5/13
Typical application schematics LM2903W

4 Typical application schematics

Figure 7. Basic comparator Figure 8. Driving CMOS
5 V
V
= 5 V
CC
100 kΩ
+V
-V
15 kΩ
+V
-V
(ref)
1/ 2
LM2903
(ref)
(ref)
(ref)
1/2
LM2903
V
O

Figure 9. Driving TTL Figure 10. Low frequency op-amp

5 V
5 V
15 k
1/2
LM2903
100 kΩ
AV = 100
0.5 μF
+V
-V
(ref)
(ref)
1/ 2
LM2903
10 kΩ
~
e
&
&
l
1 kΩ
&
Ω
e
o

Figure 11. Low frequency op-amp Figure 12. Transducer amplifier

5 V
(eo = 0 V for el = 0 V)
Magnetic pick-up
~
e
1 kΩ
15 kΩ
1/ 2
LM2903
l
0.5 μF
100 kΩ
2N 2222
e
o
AV = 100
6/13 Doc ID 022662 Rev 1
10 kΩ
5 V
10 kΩ
1/ 2
LM2903
20 MΩ
3 kΩ
e
o
LM2903W Typical application schematics
Figure 13. Low frequency op- amp with offset
~
e
l
Figure 14. Zero crossing detector (single
adjust
5 V
Offset adjust
R
2
R
S
R
1
1 MΩ
100 kΩ
1 kΩ
1 MΩ
1/ 2
LM2903
100 kΩ
15 kΩ
0.5μF
R1
5 V
2N 2222
e
o
e
l
power supply)
5.1 kΩ
1N4148
100 kΩ
5.1 kΩ
10 kΩ
100 kΩ
1/ 2
LM2903
20 MΩ
5 V
5.1 kΩ

Figure 15. Limit comparator Figure 16. Split-supply applications - zero

crossing detector
V
(12 V)
CC
15 V
V
high
2R
(ref)
e
I
S
R
S
~
1/ 2
LM2903
10 kΩ
Lamp
5.1 kΩ
1/2
e
~
I
LM2903
e
o
V
low
1/2
2R
(ref)
LM2903
S
2N 2222
15 V

Figure 17. Crystal controlled oscillator Figure 18. Comparator with a negative

reference
V
= 15 V
CC
15 V
0.1 μF
200 kΩ
200 kΩ
100 kΩ
1/2
LM2903
f = 100 kHz
2 kΩ
V
CC
0
e
o
e
~
I
1/2
LM2903
5.1 kΩ
e
o
5 V
15 V
Doc ID 022662 Rev 1 7/13
Typical application schematics LM2903W

Figure 19. Time delay generator

V
=+15V
C C
V
CC
0
t
Input gating signal
V
CC
V
3
V
V
2
C1
V
1
0
t
t
t
2
1
0
10 kΩ
15 kΩ
200 k
Ω
3 kΩ
10 MΩ
10 kΩ
1/2
V
3
LM2903
3 k
10 kΩ
1/2
LM2903
t
o
A
V
(ref.)
51 kΩ
V
C1
10 kΩ
V
2
10 MΩ
1/2
LM2903
V
CC
V
03
t
t
o
3
Ω
V
CC
V
O2
t
t
o
2
0.001μF
3 k
Ω
10 MΩ
51 kΩ
V
1
t
3
t
t
4
51 kΩ
10 kΩ
1/2
LM2903
V
V
CC
O1
t0t
1

Figure 20. Two-decade high-frequency VCO

V
CC
100 kΩ
Frequency control
voltage input
Vcontrol
10 kΩ
0.1 μF
20 kΩ
50 kΩ
V
=+30V
CC
+250 mV 700 Hz f 100 kHz
V
o
control
8/13 Doc ID 022662 Rev 1
20 kΩ
+50 V
1/ 2
LM2903
500 pF
1/ 2
LM2903
3 kΩ
0.01 μF
5.1 kΩ
V
CC
V
100 kΩ
CC
3 kΩ
1/ 2
LM2903
V
/2
CC
Output 1
Output 2
/2
LM2903W Package information

5 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 022662 Rev 1 9/13
Package information LM2903W

5.1 SO-8 package information

Figure 21. SO-8 package mechanical drawing

Table 4. SO-8 package mechanical data

Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
E 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
L1 1.04 0.040
k1° 8°1° 8°
ccc 0.10 0.004
Millimeters Inches
10/13 Doc ID 022662 Rev 1
LM2903W Ordering information

6 Ordering information

Table 5. Order codes

Order code
LM2903WDT
LM2903WYDT
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are ongoing.
(1)
Temperature
range
-40°C to +125°C
Package Packing Marking
SO-8 Tape & reel 2903W
SO-8
(Automotive grade)
Tape & reel 2903WY
Doc ID 022662 Rev 1 11/13
Revision history LM2903W

7 Revision history

Table 6. Document revision history

Date Revision Changes
18-Jan-2012 1 Initial release.
12/13 Doc ID 022662 Rev 1
LM2903W
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Doc ID 022662 Rev 1 13/13
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