ADA4841 family benefits power-constrained 16- and 18-bit portable instrumentation, industrial and medical applications
About the ADA4841-x FamilyAnalog Devices has extended its portfolio of general-purpose operational amplifiers (op amps) with the ADA4841 family of single and dual devices. Offering extremely low noise and distortion and drawing just 1.1 mA of supply current, the new op amps are well suited for power-sensitive applications such as portable instrumentation, high-channel-count measurement and medical applications.
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.
Availability and Pricing
The ADA4841-1 is available now in 6-pin SOT-23 (small-outline transistor) and 8-pin SOIC (small-outline integrated circuit) packages, and is priced at $1.59 per unit in 1,000-piece quantities. The ADA4841-2 is sampling now with production quantities available in September 2005. It is offered in 8-pin SOIC and 8-pin MSOP (micro small-outline package) and is priced at $2.29 per unit in 1,000-piece quantities. Both devices are offered over the extended industrial temperature range (-40 degrees C to +125 degrees C).
