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LT1214

28MHz, 12V/µs, Single Supply Dual and Quad Precision Op Amps

Linear Technology 

LT1213/LT1214

APPLICATI S I FOR ATIO

Comparator Applications

Sometimes it is desirable to use an op amp as a compara-

tor. When operating the LT1213/LT1214 on a single 3.3V

or 5V supply, the output interfaces directly with most TTL

and CMOS logic.

The response time of the LT1213/LT1214 is a strong

function of the amount of input overdrive as shown in the

following photos. These amplifiers are unity-gain stable

op amps and not fast comparators, therefore, the logic

being driven may oscillate due to the long transition time.

The output can be speeded up by adding 20mV or more of

hysteresis (positive feedback), but the offset is then a

function of the input direction.

LT1213 Comparator Response (+)

20mV, 10mV, 5mV, 2mV Overdrives

LT1213 Comparator Response (–)

20mV, 10mV, 5mV, 2mV Overdrives

4

4

2

2

0

100

0

VS = 5V

RL = ∞

5µs/DIV

1213/14 AI01

0

100

0

VS = 5V

RL = ∞

5µs/DIV

1213/14 AI02

SI PLIFIED SCHE ATIC

I1

I2

I3

I4

Q3 Q4

–IN

Q1

+IN

Q2

Q7

Q8

Q9

Q5 Q6

CI

V+

I5

I6

CM

CF

Q10

Q11

RF

I7

BIAS

Q13

Q14 Q15

OUT

Q12

Q16

CO

I8

V–

1213/14 SS

15

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