3422

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 6

www.unisonic.com.tw

QW-R105-029,Ba

APPLICATIONS INFORMATION

UTC 3422 IN COMPARATOR APPLICATION

The UTC 3422 is a dual bipolar operational amplifier offering a single supply operation from 3V ~ 36V with very

good performances: medium speed (25MHz), unity gain stability and low noise.

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.

Figure 1 shows basic comparator application. Figure 2 shows the curves of 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.

Figure 3 shows output signal transition for a 50mV input signal overdrive respectively of 3μs.

Figure 4 shows output signal transition for a 250mV input signal overdrive respectively of 1μs.

Figure.1 Basic Comparator Application

Figure.2 Operating Conditions

0

0.5

Time (0.5μs/div)

1.0

1.5

2.0

Vo

4

2

0

3μs

6

0

0.5

Time (0.5μs/div)

1.0

1.5

2.0

Vo

4

2

0

1μs

6

Figure.3 Transition Speed @ 50mV Overdrive

Figure.4 Transition Speed @ 250mV Overdrive