Extending Rail-to-Rail Output Range for Fully Differential Amplifiers to Include True Zero Volts (TIDA-00187)
Operational amplifiers (op amps) have been used for decades in signal conditioning circuits and measurement systems. An op amp that has an output spanning from negative to positive supply rail are generally referred to as rail-to-rail output (RRO) op amps. These devices have been used increasingly in portable systems to drive analog to digital converters (ADCs) where reducing power consumption while not sacrificing converter dynamic range is a key concern. While the task calls for the lowest power RRO op amps, circuit designers are finding out that rail-to-rail doesn’t exactly mean rail-to-rail. In reality the output is limited to a couple hundred millivolts within the rail depending on the loading. This problem is known as headroom and is the result of the RRO architecture. This application report focuses on using a low power RRO fully differential op amp (THS4531A) and low noise negative bias generator (LM7705) to achieve true zero volts in a ground referenced single supply system.
Single supply +3V to +5V Extends Differential Amplifier Output to Include 0V Low Noise (Approx 100dB SNR) Low Power (2mW @ 5V) 36MHz of Bandwidth This reference design has been lab tested and is supported with design files and an application report
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