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Most power efficient drivers for 12, 14 and 16-bit A/D converters unveiled by Analog Devices
Analog Devices has introduced a family of low-power rail-to-rail amplifiers for high-speed data acquisition systems that require exceptional accuracy, precision and power efficiency. For system designers who are looking to achieve full datasheet specifications from high resolution A/D converters, the ADA4805-1 (single) and ADA4805-2 (dual) amplifiers provide the only solution with quiescent current as low as 495µA. The amplifiers' Dynamic Power Scaling (DPS) feature allows users to dynamically manage the power consumption by shutting-down the amplifier between analog-to-digital converter samples. This further reduces by up to 90 percent the power consumption - with no performance degradation - when compared to similar solutions.
The 100-MHz ADA4805-1 and ADA4805-2 amplifiers achieve a high slew rate of 160 V/µs, low noise and low distortion (-102 dBc/-116 dBc HD2/HD3 at 100 kHz) while consuming only 1.5 mW of power. The amplifiers are designed for power-sensitive portable and battery-powered data acquisition devices, such as handheld or portable test and measurement instruments, battery-powered industrial equipment and remote environmental monitoring devices. They can also be used to reduce power and thermal dissipation in high-density applications such as cellular base stations and medical imaging equipment.
With exceptionally low offset-voltage drift of 1.5µV/°C maximum (0.2µV / 0°C typical), the ADA4805 family offers eight times lower drift performance than competing high-speed (100MHz) amplifiers. The combination of superior ac and dc performance allow designers to enhance system sensitivity, dynamic range and overall system accuracy.
The ADA4805-1/-2 amplifiers have a wide voltage range, supporting 3-V supplies, and in applications that require a wider dynamic range can also operate on supplies as high as +/-5V.
Pricing, Availability and Complementary Components
| Product | Number of Amps | Availability | Temperature Range | Packaging |
| ADA4805-1 | 1 | NOW | -40°C to +125°C | SC70 |
| ADA4805-1 | 1 | NOW | -40°C to +125°C | SOT23 |
| ADA4805-2 | 2 | NOW | -40°C to +125°C | MSOP |
| ADA4805-2 | 2 | NOW | -40°C to +125°C | LFCSP |
The ADA4805 family efficiently drive a variety of A/D converters such as the AD7980 16-bit 1 MSPS; AD7091 ultra low-power 12-bit, 1 MSPS; AD7902 dual pseudo differential 16-bit 1 MSPS and AD7988 ultra low-power 16-bit SAR converters.
For more information, or details on the full range of Analog Devices products available from Anglia, please email info@anglia.com
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This news article was originally published in March 2015.
