LMC6492 Datasheet, PDF (15/18 Pages) National Semiconductor (TI) – CMOS Rail-to-Rail Input and Output Operational Amplifier

Application Circuits (Continued)
and R4 to change. The resistors change in a way such that
R2 and R4 increase by the same amount R1 and R3 de-
crease. This causes a differential voltage between the input
of the amplifier. The gain of the amplifier is adjusted by R_f.
Spice Macromodel
A spice macromodel is available for the LMC6492/4. This
model includes accurate simulation of:
• Input common-model voltage range
• Frequency and transient response
• GBW dependence on loading conditions
• Quiescent and dynamic supply current
• Output swing dependence on loading conditions
and many other characteristics as listed on the macromodel
disk.
Contact your local National Semiconductor sales office to
obtain an operational amplifier spice model library disk.
15
www.national.com