LM146, LM346

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SNOSBH5B – MAY 2004 – REVISED SEPTEMBER 2004

APPLICATION HINTS

Avoid reversing the power supply polarity; the device will fail.

COMMON-MODE INPUT VOLTAGE

The negative common-mode voltage limit is one diode drop above the negative supply voltage. Exceeding this

limit on either input will result in an output phase reversal. The positive common-mode limit is typically 1V below

the positive supply voltage. No output phase reversal will occur if this limit is exceeded by either input.

For a desired output voltage swing the value of the minimum load depends on the positive and negative output

INPUT CAPACITANCE

the open loop frequency response of the device. For instance with resistive feedback (Figure 27), this pole

occurs at ½

frequency corner of the closed loop gain of the amplifier; if not, place a lead capacitor in the feedback such that

resistance of the circuit.

Figure 27. Resistive Feedback Circuit Example

TEMPERATURE EFFECT ON THE GBW

proportional to temperature (see Typical Applications).

ISOLATION BETWEEN AMPLIFIERS

The LM146 die is isothermally layed out such that crosstalk between all 4 amplifiers is in excess of

−105 dB

(DC). Optimum isolation (better than

−110 dB) occurs between amplifiers A and D, B and C; that is, if amplifier A

dissipates power on its output stage, amplifier D is the one which will be affected the least, and vice versa. Same

argument holds for amplifiers B and C.

Copyright © 2004, Texas Instruments Incorporated

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