UTC3422

LINEAR INTEGRATED CIRCUIT

4

QW-R105-029,A

APPLICATIONS INFORMATION

UTC 3422 IN COMPARATOR APPLICATION

The UTC 3422 is a dual high performances operational amplifier featuring speed of 30MHz and single supply

operation from 3V ~ 30V.

Most of operational amplifiers are not suited for comparator use because of low transition speed, output signal

incompatible with standard logics level and mainly, phase inversion.

The phase inversion occures when a strong differential signal is applied to the device inputs. The output level is

then inverted and shows a wrong logic state. The UTC 3422 does not present this problematic behaviour.

Displayed curves below show the device response in standard comparator configuration without external

components.

Transition speed : Typical transition speed under a single 5V supply voltage is about 2μs from 50mV overdrive.

Figures 3 & 4 show output signal transition for a 50mV and 250mV input signal overdrive respectively of 3μs and

1μs.

Vout

2k

+

Vin+

Vref

UTC 3422

+5V

0

0.5

Time (5ms/div)

Figure.2Operating conditions

1.0

1.5

2.0

+

-

4

2

0

-2

Figure.1 Basic comparator application

-

0

0.5

Time (0.5μs/div)

Figure.3 Transition speed @ 50mV overdrive

1.0

1.5

2.0

4

2

0

Overdrive @ 50mV

6

0

0.5

Time (0.5μs/div)

Figure.4 Transition speed @ 250mV overdrive

1.0

1.5

2.0

4

2

0

Overdrive @ 250mV

6