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Precision amps improve performance in communications, audio apps

Analog Devices announced a family of precision operational amplifiers that deliver the optimal combination of low noise and low power at the higher speeds required by communications applications, and the higher output drive capability necessary for audio applications.

The AD8615/16/18 family of single, dual, and quad operational amplifiers with rail-to-rail inputs and outputs are the latest products to use Analog Devices' patented DigiTrim digital trimming technique, eliminating the need for costly accuracy adjustments. Featuring 24 MHz bandwidth and 0.002% total harmonic distortion (THD), the amplifier family is twice as fast and has 60% lower THD than the previous generation, easily meeting the performance requirements of optical networking and data acquisition applications.

Audio applications benefit from the family's higher output drive, which increases current capacity by up to 50% to drive heavy loads in portable equipment such as cell phone headsets. Fully-specified to operate from single 2.7-V to 5-V supplies, the parts feature 65 V max offset voltage, 8 nV/Hz noise, and 1 pA max input bias current making them suitable for a wide variety of applications, including filters, integrators, photodiode amplifiers, high-impedance sensors used in optical communications, GPS receivers, data acquisition, industrial controls and medical instrumentation.

The AD8616 and AD8618 offer 150-mA output drive capability, making them ideal for audio line drivers and other applications driving heavy loads in portable and low powered instrumentation, audio amplification for portable devices, portable phone headsets, bar code scanners, and multipole filters. The ability to swing rail to rail at both the input and output increases the available dynamic range. This, combined with low offset errors, enables designers to buffer CMOS analog-to-digital converters (ADCs), digital-to-analog converters (DACs), ASICs, and other wide output swing devices in single-supply systems. The rail-to-rail output and low distortion work particularly well with the AD5541 16-bit serial input, voltage-output DAC to maintain the accuracy needed in data acquisition systems and automated test equipment.

The family is specified over the extended industrial temperature range of -40 degrees to +125 degrees Celsius. The single AD8615 is now sampling with production quantities available in September 2004. The dual AD8616 and quad AD8618 are already fully released.

The AD8615 is available in space-saving 5-lead TSOT packaging, the AD8616 is available in 8-lead MSOP and narrow SOIC packaging, and the AD8618 is available in 14-lead narrow SOIC and TSSOP packaging.

Pricing for the AD8615, AD8616 and AD8618 starts at $0.75, $1.15, $2.05 per unit, respectively, in 1,000-piece quantities.

For more information, please visit
AD8615 data sheet

AD8616 data sheet
AD8618 data sheet

Analog Devices webite

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