3422 Datasheet, PDF (4/8 Pages) Unisonic Technologies – HIGH PERFORMANCE DUAL BIPOLAR OPERATINAL AMPLIFIER

UTC 3422
LINEAR INTEGRATED CIRCUIT
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.
VOH min. is 3.7V and VOL max. is 0.2V (2kΩ load) making it compatible with standard logic families.
Figures 3 & 4 show output signal transition for a 50mV and 250mV input signal overdrive respectively of 3μs and
1μs.
Figure.1 Basic comparator application
+5V
Vin+
Vref
+
UTC 3422
-
2k
2.0
VREF
1.5
Figure.2 Operating conditions
1.0
0.5
Vin+
Vout
0
4
Ta=25℃, RL=2kΩ
Vcc+=+5V
2
Vo
Vcc^-=GND
Overdrive=(VIN+) - (VREF)
0
-2
Time (5ms/div)
Figure.3 Transition speed @ 50mV overdrive
2.0
VREF
1.5
1.0
0.5
Vin+
0
Overdrive @ 50mV ⁶
4
2
Vo
0
Time (0.5μs/div)
Figure.4 Transition speed @ 250mV overdrive
2.0
VREF
1.5
1.0
0.5
Vin+
0
6
4
Overdrive @ 250mV ₂
Vo
0
Time (0.5μs/div)
UTC UNISONIC TECHNOLOGIES CO., LTD. 4
QW-R105-029,A