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LM122H データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM122H
部品情報  Precision Timers
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM122H データシート(HTML) 9 Page - National Semiconductor (TI)

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Typical Applications (Continued)
The average charging current through Rt is about 30 nA so
some attention must be paid to parts layout to prevent stray
leakage paths The suggested timing capacitor has a typical
self time constant of 300 hours and a guaranteed minimum
of 25 hours at a25 C Other capacitor types may be used if
sufficient data is available on their leakage characteristics
Two Terminal Time Delay Switch
The LM122 can be used as a two terminal time delay switch
if an ‘‘on’’ voltage drop of 2V to 3V can be tolerated In
Figure 9 the timer is used to drive a relay ‘‘on’’ Rt  Ct
seconds after application of power ‘‘Off’’ current of the
switch is 4 mA maximum and ‘‘on’’ current can be as high
as 50 mA
Zero Power Dissipation Between Timing Intervals
In some applications it is desirable to reduce supply current
drain to zero between timing cycles In
Figure 10 this is
accomplished by using an external PNP as a latch to drive
the Va pin of the timer
Between timing periods Q1 is off and no supply current is
drawn When a trigger pulse of 5V minimum amplitude is
received the LM122 output transistor and Q1 latch for the
duration of the timing period D1 prevents the step on the
Va pin from coupling back into the trigger pin If the trigger
input is a short pulse C1 and R2 may be eliminated RL
must have a minimum value of (VCC)(25 mA)
TLH7768 – 20
FIGURE 9 2-Terminal Time Delay Switch
Frequency to Voltage Converter
An accurate frequency to voltage converter can be made
with the LM122 by averaging output pulses with a simple
one pole filter as shown in
Figure 11 Pulse width is adjusted
with R2 to provide initial calibration at 10 kHz The collector
of the output transistor is tied to VREF giving constant am-
plitude pulses equal to VREF at the emitter output R4 and
C1 filter the pulses to give a dc output equal to
(Rt)(Ct)(VREF)(f) Linearity is about 02% for a 0V to 1V out-
put If better linearity is desired R5 can be tied to the sum-
ming node of an op amp which has the filter in the feedback
path If a low output impedance is desired a unity gain buff-
er such as the LM110 can be tied to the output An analog
meter can be driven directly by placing it in series with R5 to
ground A series RC network across the meter to provide
damping will improve response at very low frequencies
Pulse Width Detector
By driving the logic terminal of the LM122 simultaneous to
the trigger input a simple accurate pulse width detector can
be made
(Figure 12)
TLH7768 – 21
FIGURE 10 Zero Power Dissipation
Between Timing Intervals
TLH7768 – 22
FIGURE 11 Frequency to Voltage Converter
(Tachometer) Output Independent of Supply Voltage
TLH7768 – 23
VOUT e 0forWR1 C1
Pulse Out e W b R1 C1 forWR1 C1
FIGURE 12 Pulse Width Detector
9


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