TL074H: TL074 pspice

See the attached modeltl07xh_tl08xh_a.lib

Hi Druilhe,

the TL074H is not an input rail-to-rail OPAmp. Section 6.5 of datasheet recommends an input voltage range of (VCC–) + 2V to (VCC+) + 0.1V.

Kai

Hi Kai,

Section8.4 Device Functional Modes
These devices are powered on when the supply is connected. These devices can be operated as a single-supply.

I don't understand, why it does not work in single supply?

I have trouble understanding this notion: the TL074H is not an input rail-to-rail OPAmp. Section 6.5 of datasheet recommends an input voltage range of (VCC–) + 2V to (VCC+) + 0.1V. Can you explain me

Thank you

Hello Druilhe,

TL074H has a single pair of NMOS transistors on the inputs. Transistors need some headroom to operate. When input voltage gets too close to VCC- pin (ground in single supply), the transistor will cut off (become like open circuit). At this time output is abraitary; it may want to go low or high. Very unlikely would be alternating both low and high in a noise pattern.

In summary TL074H does work in single supply, if common voltage is correct.

Hello Ron,

If I understand correctly, if the power supply voltage Vcc- = 0V, the voltage on the +and- pins of the AOP must be at least 2V for the input stage to be correctly polarized