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LM139JAN-SP Arkusz danych(PDF) 8 Page - Texas Instruments

Numer części LM139JAN-SP
Szczegółowy opis  LM139JAN Low Power Low Offset Voltage Quad Comparators
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LM139JAN
SNOSAJ7B – FEBRUARY 2005 – REVISED MARCH 2013
www.ti.com
APPLICATION HINTS
The LM139 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 the
input resistors to < 10 k
Ω reduces the feedback signal levels and finally, adding even a small amount (1 to 10
mV) of positive feedback (hysteresis) causes such a rapid transition that oscillations due to stray feedback are
not possible. Simply socketing 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 LM139 establishes a drain current which is independent of the magnitude of the power
supply voltage over the range of from 5 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 prevent 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 LM139 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 LM139 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 independent 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 60
Ω RSAT 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)
Figure 7. Basic Comparator
Figure 8. Driving CMOS
8
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