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LT1013/LT1014

APPLICATIONS INFORMATION

(b) When the input is more than 400mV below ground (at

°C), the input stage saturates (transistors Q3 and Q4)

and phase reversal occurs at the output. This can cause

lock-up in servo systems. Due to a unique phase reversal

protection circuitry (Q21, Q22, Q27, Q28), the LT1013/

1014’s outputs do not reverse, as illustrated below, even

when the inputs are at –1.5V.

There is one circumstance, however, under which the phase

reversal protection circuitry does not function: when the

other op amp on the LT1013, or one specific amplifier of the

other three on the LT1014, is driven hard into negative

saturation at the output.

Phase reversal protection does not work on amplifier:

A when D’s output is in negative saturation. B’s and C’s

outputs have no effect.

B when C’s output is in negative saturation. A’s and D’s

outputs have no effect.

C when B’s output is in negative saturation. A’s and D’s

outputs have no effect.

D when A’s output is negative saturation. B’s and C’s

outputs have no effect.

At the output, the aforementioned single supply designs

either cannot swing to within 600mV of ground (OP-20) or

cannot sink more than a few microamperes while swing-

ing to ground (LM124, LM158). The LT1013/1014’s

all-NPN output stage maintains its low output resistance

and high gain characteristics until the output is saturated.

In dual supply operations, the output stage is crossover

distortion-free.

Comparator Applications

The single supply operation of the LT1013/1014 lends

itself to its use as a precision comparator with TTL

compatible output:

In systems using both op amps and comparators, the

LT1013/1014 can perform multiple duties; for example,

on the LT1014, two of the devices can be used as op amps

and the other two as comparators.

LT1013/LT1014

NO PHASE REVERSAL

6Vp-p INPUT, – 1.5V TO 4.5V

LM324, LM358, OP-20

EXHIBIT OUTPUT PHASE

REVERSAL

VS = 5V, 0V

µs/DIV

– 100

VS = 5V, 0V

µs/DIV

100

Voltage Follower with Input Exceeding the Negative Common-Mode Range

Comparator Rise Response Time

10mV, 5mV, 2mV Overdrives

Comparator Fall Response Time

to 10mV, 5mV, 2mV Overdrives

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