This document introduces how to design linear circuits for 5V single supply operation.
The document addresses the challenges of powering analog components directly from a 5V digital rail, which is often noisy due to logic clocking. It explains that while high-performance applications usually require dedicated supplies, many standard analog functions can be successfully implemented with good design practices using the logic supply.
The note presents several specific circuit examples designed for 5V single-supply operation. These include a linearized signal conditioner for platinum RTDs, a methane detector transducer circuit, a cold junction compensated thermocouple conditioner, and two types of precision instrumentation amplifiers (one standard and one ultra-precision chopper-stabilized).
Yes, many analog applications can be successfully implemented using the logic supply if combined with good design practices.
The circuit compensates sensor nonlinearity to within +0.05°C over its operating range.
The bandwidth of the chopper-stabilized amplifier design is limited to 10Hz.