Innovation by Design

Product category: Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADA4841 family
Edited by the Electronicstalk Editorial Team on 8 August 2005

Frugal op amps boast
low noise and distortion

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New single and dual op amps are well suited for power-sensitive applications such as portable instrumentation, high-channel-count measurement and medical applications

Analog Devices has extended its portfolio of general-purpose op amps with the ADA4841 family of single and dual devices. Offering extremely low noise and distortion and drawing just 1.1mA 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 2nV/(rt)Hz wideband voltage noise and 1.4pA/(rt)Hz wideband current noise.

To maintain a low noise environment at lower frequencies these amplifiers have low 1/f noise of 6nV/(rt)Hz and 13pA/(rt)Hz at 10Hz.

Additionally, the amplifiers have extremely low distortion, with 111-dBc spurious free dynamic range (SFDR) at 100kHz.

This level of noise and distortion is accomplished for 1.1mA 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 100mV of either supply rail, maximising the linear range for power supplies from 2.7 to 12V.

On the input, the common mode voltage range extends down to the negative supply.

In addition, these amplifiers offer excellent dc precision with 500uV maximum 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 18bit portable systems.

The ADA4841-x family works well with leading 16 to 18bit ADCs, including ADI's AD7685 and AD7686.

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 1000-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 1000-piece quantities.

Both devices are offered over the extended industrial temperature range (-40 to +125C).

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