LMC6464AMWG-QML NSC [National Semiconductor], LMC6464AMWG-QML Datasheet - Page 14

• Manufacturer Part Number: LMC6464AMWG-QML
• Description: Micropower, Rail-to-Rail Input and Output CMOS Operational Amplifier
• Manufacturer: NSC [National Semiconductor]

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Typical Single-Supply Applications
TRANSDUCER INTERFACE CIRCUITS
Photocells can be used in portable light measuring instru-
ments. The LMC6462, which can be operated off a battery, is
an excellent choice for this circuit because of its very low in-
put current and offset voltage.
LMC6462 AS A COMPARATOR
Figure 17 shows the application of the LMC6462 as a com-
parator. The hysteresis is determined by the ratio of the two
resistors. The LMC6462 can thus be used as a micropower
comparator, in applications where the quiescent current is an
important parameter.
HALF-WAVE AND FULL-WAVE RECTIFIERS
FIGURE 17. Comparator with Hysteresis
FIGURE 18. Half-Wave Rectifier with
FIGURE 16. Photo Detector Circuit
Input Current Protection (R
DS012051-24
DS012051-23
I
)
DS012051-22
14
In Figure 18 Figure 19 , R
since excess current can be caused by the input voltage ex-
ceeding the supply voltage.
PRECISION CURRENT SOURCE
The output current I
OSCILLATORS
For single supply 5V operation, the output of the circuit will
swing from 0V to 5V. The voltage divider set up R
R
move from 1.67V (
behaves as the threshold voltage.
R
quency of oscillation, f
4
1
and C
will cause the non-inverting input of the LMC6462 to
FIGURE 21. 1 Hz Square-Wave Oscillator
1
FIGURE 20. Precision Current Source
determine the time constant of the circuit. The fre-
with Input Current Protection (R
FIGURE 19. Full-Wave Rectifier
1
⁄
3
OUT
of 5V) to 3.33V (
OSC
is given by:
I
is
limits current into the amplifier
2
⁄
3
DS012051-26
of 5V). This voltage
DS012051-27
I
DS012051-25
)
2
, R
3
and