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Micro-power ADCs suit portable DAQ systems

Posted: 14 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:micropower ADC? remote sensors?


austriamicrosystems has expanded its micro-power ADC family with cost-efficient AS1528, a 10bit, ultralow-power single-channel fully-differential ADC, and AS1529, a dual-channel single-ended ultralow-power ADCs.

According to the company, the AS1528/29 family provides a well-suited solution for small battery-powered devices and portable DAQ systems such as remote sensors or pen digitizers with tough space requirements.

In line with the micropower consumption of their 12bit brothers AS1524/25, the 10bit AS1528/29 also consume less than 350?A (3V) at the 150KSps maximum sampling rate. The advanced automatic shutdown feature places the device into sleep mode between conversions, significantly reducing power consumption at lower sampling speeds. Power consumption drops to 245?A (3V) at a reduced speed of 100KSps, further down to only 2.5?A at a still reasonable speed of 1KSps and to stunning 200nA during shutdown.

"These ADCs are perfect for applications with extremely demanding power consumption and space requirements. One of the key aspects of their design in terms of power reduction is the intelligent automatic shutdown. Thanks to this unique design, the AS1528/29 is always at the perfect operating point drawing the minimum current across all sampling rates," said Walter Moshammer, marketing director of standard linear at austriamicrosystems.

In addition to low power requirements, the AS1528/29 offer outstanding DC performance of 0.275LSB (max) for INL and DNL, as well as an ultra-low offset and gain error of 0.25LSB combined with dynamic specifications like a THD of -79.5dB.

SPI, QSPI and a Microwire-compatible interface enable high-speed data access to the AS1528/29 while minimizing board space. Both devices generate an internal clock; however, they also support an external clock for increased flexibility. Both ICs operate from a 2.7-5.25V single supply.

The AS1528/29 family is available in an 8-pin 3mm x 3mm TDFN package suitable for operating environments ranging from -40C to 85C.

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