Amplifiers integrate DSP for improved power efficiency

25th September 2014
Siobhan O'Gorman

Designed for high-speed data acquisition systems which require a high level of accuracy, precision and power efficiency, a family of rail-to-rail amplifiers have been introduced by Analog Devices. The 100MHz ADA4805-1 (single) and ADA4805-2 (dual) amplifiers feature DPS which allows users to manage power consumption by shutting-down the amplifier between ADC samples.

Without performance degradation, this DPS feature reduces the power consumption by up to 90% compared to competing amplifiers, according to ADI. While consuming only 1.5mW of power, the amplifiers achieve a high slew rate of 160V/μs, low noise (5.9 nV/√Hz at 100kHz) and low distortion (−102 dBc/−116dBc HD2/HD3 at 100kHz). The single and dual amplifiers also feature a quiescent current as low as 495µA.

The ADA4805-1 and ADA4805-2 offer an offset-voltage drift of 1.5µV/°C maximum (0.2μV/0C typical), which Analog Devices claims is eight times lower than competing 100MHz amplifiers. Through the combination of AC and DC performance, the amplifiers allow designers to enhance system sensitivity, dynamic range and system accuracy.

Supporting 3V supplies, the amplifiers have a wide voltage range. For applications that require a wider range, the amplifiers can also operate on supplies as high as ±5V. The family of amplifiers are suitable for use with ADCs such as the AD7980 16-bit 1MSPS; AD7091 ultra low-power 12-bit 1MSPS; AD7902 dual pseudo differential 16-bit 1MSPS and AD7988 ultra low-power 16-bit SAR converters.

The ADA4805-1 and ADA4805-2 are suitable for handheld or portable test and measurement instruments, battery-powered industrial equipment and remote environmental monitoring devices. To reduce power and thermal dissipation, the amplifiers can also be used in high-density applications such as cellular base stations and medical imaging equipment.

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