LM13700M National Semiconductor, LM13700M Datasheet - Page 15

• Manufacturer Part Number: LM13700M
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LM13700M

• No. Of Amplifiers: 2
• No. Of Pins: 16
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Package / Case: 16-NSOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Voltage Controlled Oscillators
Figure 18 shows how to build a VCO using one amplifier when the other
amplifier is needed for another function.
FIGURE 18. Single Amplifier VCO
DS007981-25
FIGURE 17. Sinusoidal VCO
(Continued)
15
Additional Applications
Figure 19 presents an interesting one-shot which draws no
power supply current until it is triggered. A positive-going trig-
ger pulse of at least 2V amplitude turns on the amplifier
through R
fier regenerates and latches its output high until capacitor C
charges to the voltage level on the non-inverting input. The
output then switches low, turning off the amplifier and dis-
charging the capacitor. The capacitor discharge rate is
speeded up by shorting the diode bias pin to the inverting in-
put so that an additional discharge current flows through D
when the amplifier output switches low. A special feature of
this timer is that the other amplifier, when biased from V
can perform another function and draw zero stand-by power
as well.
B
and pulls the non-inverting input high. The ampli-
DS007981-24
www.national.com
O
,
I