TSH22I datasheet(5/11 Pages) STMICROELECTRONICS

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TSH22

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APPLICATIONS INFORMATION

TSH22 IN COMPARATOR APPLICATION

The TSH22 is a dual high performances opera-

tional amplifier featuring speed of 30MHz and sin-

gle supply operation from 3V to 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 differ-

ential signal is applied to the device inputs. The

output level is then inverted and shows a wrong

logic state. TSH22 does not present this problem-

atic behaviour.

Figure 1 : Basic comparator application

Figure 3 : Transition speed@ 50mV overdrive

Displayed curves below show the device re-

sponse in standard comparator configuration with-

out external components.

Transition speed : Typical transition speed under

single 5V supply voltage is about 2

µs from

50mV overdrive. VOH min. is 3.7V and VOL max. is

0.2V (2k

Ω load) making it compatible with stan-

dard logic families.

Figures 3 & 4 show output signal transition for a

50mV and 250mV input signal overdrive respec-

tively of 3

µs and 1µs.

Figure 2 : Operating conditions

Figure 4 : Transition speed@ 250mV overdrive

Vin+

Vref

+5V

Vout

2kW

TSH22

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