LMC6464AMJQML datasheet(18/23 Pages) NSC

Part #	LMC6464AMJQML

Description	LMC6464QML Quad Micropower, Rail-to-Rail Input and Output CMOS Operational Amplifier

PDF	23 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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18 / 23 page

LMC6464QML

SNOSAR8A – DECEMBER 2010 – REVISED MARCH 2013

www.ti.com

Figure 52. Full-Wave Rectifier with Input Current Protection (RI)

In Figure 51 Figure 52, RI limits current into the amplifier since excess current can be caused by the input

voltage exceeding the supply voltage.

PRECISION CURRENT SOURCE

Figure 53. Precision Current Source

The output current IOUT is given by:

(3)

OSCILLATORS

Figure 54. 1 Hz Square-Wave Oscillator

For single supply 5V operation, the output of the circuit will swing from 0V to 5V. The voltage divider set up R2,

R3 and R4 will cause the non-inverting input of the LMC6464 to move from 1.67V (⅓ of 5V) to 3.33V (⅔ of 5V).

This voltage behaves as the threshold voltage.

R1 and C1 determine the time constant of the circuit. The frequency of oscillation, fOsc is

(4)

where

Δt is the time the amplifier input takes to move from 1.67V to 3.33V. The calculations are shown below.

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LMC6464AMJQML Datasheet(PDF) 18 Page - National Semiconductor (TI)