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LM2901EP Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LM2901EP
Beschreibung Low Power Low Offset Voltage Quad Comparators
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 17 Seiten
LM2901EP Datasheet, Funktion
January 2005
LM2901EP
Low Power Low Offset Voltage Quad Comparators
General Description
The LM2901EP consists of four independent precision volt-
age comparators with an offset voltage specification as low
as 2 mV max for all four comparators. These were designed
specifically to operate from a single power supply over a
wide range of voltages. Operation from split power supplies
is also possible and the low power supply current drain is
independent of the magnitude of the power supply voltage.
This comparator also has a unique characteristic in that the
input common-mode voltage range includes ground, even
though operated from a single power supply voltage.
Application areas include limit comparators, simple analog to
digital converters; pulse, squarewave and time delay gen-
erators; wide range VCO; MOS clock timers; multivibrators
and high voltage digital logic gates. The LM2901EP was
designed to directly interface with TTL and CMOS. When
operated from both plus and minus power supplies, it will
directly interface with MOS logic — where the low power
drain of the LM2901EP is a distinct advantage over standard
comparators.
ENHANCED PLASTIC
Extended Temperature Performance of −40˚C to +85˚C
Baseline Control - Single Fab & Assembly Site
Process Change Notification (PCN)
Qualification & Reliability Data
Solder (PbSn) Lead Finish is standard
Enhanced Diminishing Manufacturing Sources (DMS)
Support
Features
n Wide supply voltage range
n LM2901:
2 to 36 VDC or ±1 to ±18 VDC
n Very low supply current drain (0.8 mA) — independent
of supply voltage
n Low input biasing current:
25 nA
n Low input offset current:
±5 nA
n Offset voltage:
±3 mV
n Input common-mode voltage range includes GND
n Differential input voltage range equal to the power
supply voltage
n Low output saturation voltage:
250 mV at 4 mA
n Output voltage compatible with TTL, DTL, ECL, MOS
and CMOS logic systems
Advantages
n High precision comparator
n Reduced VOS drift over temperature
n Eliminates need for dual supplies
n Allows sensing near GND
n Compatible with all forms of logic
n Power drain suitable for battery operation
Applications
n Selected Military Applications
n Selected Avionics Applications
Ordering Information
PART NUMBER
LM2901MEP
(Notes 1, 2)
VID PART NUMBER
V62/04743-01
TBD
NS PACKAGE NUMBER (Note 3)
M14A
TBD
Note 1: For the following (Enhanced Plastic) version, check for availability: - LM2901MXEP, LM2901NEP. Parts listed with an "X" are provided in Tape
& Reel and parts without an "X" are in Rails.
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
© 2005 National Semiconductor Corporation DS201139
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LM2901EP Datasheet, Funktion
Application Hints
The LM2901EP is a high gain, wide bandwidth device which,
like most comparators, can easily oscillate if the output lead
is inadvertently allowed to capacitively couple to the inputs
via stray capacitance. This shows up only during the output
voltage transition intervals as the comparator changes
states. Power supply bypassing is not required to solve this
problem. Standard PC board layout is helpful as it reduces
stray input-output coupling. Reducing this input resistors to
< 10 kreduces the feedback signal levels and finally,
adding even a small amount (1 to 10 mV) of positive feed-
back (hysteresis) causes such a rapid transition that oscilla-
tions due to stray feedback are not possible. Simply socket-
ing the IC and attaching resistors to the pins will cause
input-output oscillations during the small transition intervals
unless hysteresis is used. If the input signal is a pulse
waveform, with relatively fast rise and fall times, hysteresis is
not required.
All pins of any unused comparators should be tied to the
negative supply.
The bias network of the LM2901EP series establishes a
drain current which is independent of the magnitude of the
power supply voltage over the range of from 2 VDC to 30
VDC.
It is usually unnecessary to use a bypass capacitor across
the power supply line.
The differential input voltage may be larger than V+ without
damaging the device. Protection should be provided to pre-
vent the input voltages from going negative more than −0.3
VDC (at 25˚C). An input clamp diode can be used as shown
in the applications section.
The output of the LM2901EP is the uncommitted collector of
a grounded-emitter NPN output transistor. Many collectors
can be tied together to provide an output OR’ing function. An
output pull-up resistor can be connected to any available
power supply voltage within the permitted supply voltage
range and there is no restriction on this voltage due to the
magnitude of the voltage which is applied to the V+ terminal
of the LM2901EP package. The output can also be used as
a simple SPST switch to ground (when a pull-up resistor is
not used). The amount of current which the output device
can sink is limited by the drive available (which is indepen-
dent of V+) and the β of this device. When the maximum
current limit is reached (approximately 16 mA), the output
transistor will come out of saturation and the output voltage
will rise very rapidly. The output saturation voltage is limited
by the approximately 60RSAT of the output transistor. The
low offset voltage of the output transistor (1 mV) allows the
output to clamp essentially to ground level for small load
currents.
Typical Applications (V+ = 5.0 VDC) (Note 15)
Basic Comparator
Driving CMOS
Driving TTL
20113903
AND Gate
20113904
OR Gate
20113905
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