ADCs Extend Operation in Power-Sensitive Applications
Targeting battery-powered applications such as remote sensors, the LTC2451 and LTC2452 from Linear Technology are a pair of 16-bit delta sigma ADCs have a 0.5µA (max) shutdown current to extend system operating life. For example, the devices dissipate just 40 µW from a 3-V supply when sampling once per second. With a dynamic input current of less than 50 nA, the 3 x 2-mm 8-pin DFN-packaged devices operate with an input from 2.7 to 5.5 V. The LTC2451 communicates via I²C and can measure a single-ended input between 0 V to VCC. The LTC2452 communicates via SPI and is capable of measuring a differential input up to ±VCC. Features inlcude 16-bit DC performance of 2LSB integral nonlinearity error, 1.4 µVRMS transition noise, and 0.01% gain error. The LTC2451 draws 0.7mA (max) supply current and the LTC2452 1.2mA (max) at the 60Hz maximum sample rate. Available in both commercial and industrial temperature grade versions, pricing for the LTC2451 begins at $1.15 and the LTC2452 at $1.25, each in 1,000-piece quantities.