The circuits on this slide show two different approaches for eliminating the negative rail. The resulting power consumption can be surprising, due to the architectures and speeds of the two amplifiers shown here. A negative supply was used in the previous split supply circuits to allow the amplifier to drive all the way to 0V, thus matching the input range of the ADC. The LTC6360 (shown in the upper circuit) takes a different approach: it creates its own negative rail with an internal low noise charge pump. This allows its output to swing all the way to 0V on a single 5V supply. The LTC6362 (shown in the lower circuit), is designed to drive the LTC2379. In this case, the unique feature of the LTC2379, digital gain compression, sets the ADC input range to 10% to 90% of the reference voltage, allowing the LTC6362 to drive its full scale on a single 5V supply. The single-ended LTC6360 has a significantly higher power dissipation of 87.5mW due to the internal charge pump and faster settling time; it offers 93dB SNR performance with the LTC2369. The fully differential LTC6362 offers lower power dissipation of 5mW along with exceptional 99dB SNR performance when combined with the fully differential LTC2379. In summary, the single supply ADC drivers eliminate the negative rail while reducing the complexity of the system, and the LTC6362 used with the digital gain compression also helps lower the power dissipation in the signal chain.