Portable devices

Analog Devices has extended its portfolio of general-purpose operational amplifiers with the ADA4841 family of single and dual devices.

Offering low noise and distortion and drawing just 1.1 mA of supply current, the new op amps are suited for power-sensitive applications such as portable instrumentation, high-channel-count measurement and medical applications.

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 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.

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.