Analogue, Mixed Signal, LSI


Small, ultra low-power ADCs

27 June 2007 Analogue, Mixed Signal, LSI

The AS1524 and AS1525 from austriamicrosystems are 12-bit ultra low-power single channel full differential A/D converters, the former having a single full-differential channel and the latter having two single-ended channels. With power consumption of 350 mA (at 3 V) at a sampling rate of 150 ksps and excellent dynamic performance in a small 3 x 3 mm, 8 pin TDFN package, these devices offer an optimal solution for small battery powered devices and portable data acquisition systems such as remote sensors or pen digitisers with difficult space requirements. An automatic shutdown feature places the devices between conversions into sleep mode, reducing the power consumption significantly at lower sampling rates. Consumption drops to 245 mA at 100 ksps, 2,5 mA at 1 ksps and 200 nA during shutdown. SPI, QSPI and a microwire-compatible interface enable high-speed data access while minimising board space. Both devices generate an internal clock and also support an external clock for increased flexibility. They operate between -40°C and


+85°C from a 2,7 to 5,25 V single supply.



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