LMV324M National Semiconductor, LMV324M Datasheet - Page 19

• Manufacturer Part Number: LMV324M
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LMV324M

• No. Of Amplifiers: 1
• Slew Rate: 1V/µs
• No. Of Pins: 14
• Amplifier Type: Operational
• Mounting Type: Surface Mount
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Application Notes
When the output voltage V
capacitor C is charged toward V
across C rises exponentially with a time constant τ = R
and this voltage is applied to the inverting input of the op
amp. Meanwhile, the voltage at the non-inverting input is set
at the positive threshold voltage (V
capacitor voltage continually increases until it reaches V
at which point the output of the generator will switch to its
low, V
input is switched to the negative threshold voltage (V
the generator. The capacitor then starts to discharge toward
V
When the capacitor voltage reaches V
pulse generator switches to V
charge, and the cycle repeats itself.
OL
exponentially through R
OL
(= 0V in this case). The voltage at the non-inverting
FIGURE 16. Pulse Generator
1
O
, with a time constant τ = R
is first at its high, V
OH
OH
(Continued)
TH+
. The capacitor starts to
through R
) of the generator. The
TH-
, the output of the
2
. The voltage
10006081
OH
TH-
, the
TH+
) of
2
1
C,
C.
,
19
As shown in the waveforms in Figure 17, the pulse width (T
is set by R
set by R
have different frequencies and pulse width by selecting dif-
ferent capacitor value and resistor values.
Figure 18 shows another pulse generator, with separate
charge and discharge paths. The capacitor is charged
through R
Figure 19 is a squarewave generator with the same path for
charging and discharging the capacitor.
FIGURE 17. Waveforms of the Circuit in Figure 16
1
, C and V
1
2
, C and V
and is discharged through R
FIGURE 18. Pulse Generator
OL
OH
. This pulse generator can be made to
, and the time between pulses (T
2
.
www.national.com
10006086
2
10006077
) is
1
)