Rail-to-rail input amplifier has no crossover distortion

The OPA365 rail-to-rail input amplifier achieves rail-to-rail input swings using a charge pump to create a higher internal voltage for the input stage; in contrast to the more common method of using a dual-input pair. The amplifier has a 50-MHz bandwidth and a 0.0006% THD+N to 100 kHz. At higher than that value, the charge pump contributes a fixed-frequency noise that you can filter out. Voltages include a 2.2 to 5.5V supply voltage and a 200-µV maximum-offset voltage. Settling time is 300 nsec to 0.01%. This part targets multiplexers and ADCs. It settles quickly due to its 50-MHz bandwidth and can input large rail-to-rail signals into the converter with less distortion that a dual-input rail-to-rail amplifier. The OPA365 comes in an SOT23-5 package, costs 95 cents (1000), and will be available in late October 2006.

Texas Instruments, www.ti.com