High-resolution sigma-delta ADCs with low power consumption
( 01 Jun 2003 )
Chip manufacturers are continuosly called upon to give designers analogto-digital converters (ADCs) that are high resolution, support low power consumption and maintain small form factor. Analog Devices heeds this call by unveiling what it claims as the industry ’s lowest power consumption sigma-delta ADCs. Operating from a single 3 or 5V supply, the AD7790 and AD7791 ADCs consume only 60 µA at 3V and 75 µA at 5V with buffering disabled.
Applications requiring a diff e rent low f requency analog front-end accuracy level can choose between the 24-bit resolution AD7791 and the 16-bit resolution AD7790. Both accept differential inputs with optional buffering and support supply voltage monitoring as an added feature. To cater for applications that do not require a buffer and a fixed 16.6 Hz data rate, Analog Devices also offers the 24-bit AD7788 and 16-bit AD7789 versions.
The ADCs operate from an internally generated clock, eliminating the need for user supplied clock. User software programmability allows conversion rates from 9.5 Hz up to 120 Hz to be addressed while simultaneous rejection for 50 Hz and 60 Hz is supported at 16.6 Hz.
The 4 ADCs are ideal for use in lowpower portable instrumentation applications that require high resolution. The parts can be used in single conversion mode and continuous mode operations.
The sigma-delta ADCs come in 10-lead MSOP packaging. AD7791 is priced at US$3.83, AD7790 at US$2.95, AD7789 at US$2.95, and AD7788 at US$1.95 (all in 1000-piece lots). — Shree Jaisimha in Singapore
Chip manufacturers are continuosly called upon to give designers analogto-digital converters (ADCs) that are high resolution, support low power consumption and maintain small form factor. Analog Devices heeds this call by unveiling what it claims as the industry ’s lowest power consumption sigma-delta ADCs. Operating from a single 3 or 5V supply, the AD7790 and AD7791 ADCs consume only 60 µA at 3V and 75 µA at 5V with buffering disabled.
