Linear Technology has introduced the LTC2463, a 16-bit delta sigma ADC that integrates a precision reference in 12-lead 3 x 3mm DFN and 4 x 5mm MSOP packages. With the device's integrated reference (2ppm/C typical, 10ppm/C maximum), the LTC2463 allows precise measurements with no need for an external reference. The LTC2463 communicates via a two-wire I2C interface and is a complete analogue solution for portable sensors, compact systems or power-supply monitoring.Operating from a single 2.7 to 5.5V supply, the LTC2463 measures a +/-1.25V differential input range at output rates up to 60Hz, enabling measurement of temperature, pressure, voltage or other low-frequency sensor signals. The LTC2463 achieves 16-bit DC performance of 1LSB (typical) integral nonlinearity error, 2.2uVRMS transition noise and 0.01 per cent gain error (typical). This ADC has an internal oscillator, another space-saving feature.
The LTC2463 draws 2.5mA (max) supply current at the 60Hz maximum sample rate with the internal reference active. After each conversion, the ADC enters nap mode, reducing supply current to less than 1.5mA. Supply current can be further reduced to less than 2uA (max) in sleep mode. The LTC2463 incorporates an input sampling network that reduces the dynamic input current to less than 50nA, enabling a range of external-input-protection and filter circuits. It is offered alongside the LTC2461, a 16-bit I2C ADC that measures single-ended inputs between 0 and 1.25V.
