Lowest Noise and Distortion at 1.1 mA
The ADA4841-x family satisfies a need among portable equipment designers for op amps that achieve higher resolution by lowering distortion and noise. The new op amps meet this requirement by achieving 2-nV/rt-Hz wideband voltage noise and 1.4-pA/rt-Hz wideband current noise. To maintain a low noise environment at lower frequencies these amplifiers have low 1/f noise of 6-nV/rt-Hz and 13-pA/rt-Hz at 10Hz. Additionally, the amplifiers have extremely low distortion, with 111-dBc spurious free dynamic range (SFDR) at 100 kHz. This level of noise and distortion is accomplished for 1.1 mA of supply current, which saves power and minimizes heat in any application.

Rail-to-Rail Outputs and DC Precision
The ADA4841-x family has rail-to-rail outputs that allow a signal swing within 100 mV of either supply rail, maximizing the linear range for power supplies from 2.7 V to 12 V. On the input, the common mode voltage range extends down to the negative supply. In addition, these amplifiers offer excellent dc precision with 500 microvolts max offset voltage. The combination of low noise and distortion, rail-to-rail output and dc precision make these devices well suited for low-power 16- to 18-bit portable systems. The ADA4841-x family works well with leading 16- to 18-bit ADCs, including ADI’s AD7685 and AD7686.