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Mixed Signal/Analog

16-Bit I2C ADC Integrates 2ppm/°C Reference in 3mm x 3mm Package

21st December 2009

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Datasheet

Linear Technology has introduced the LTC2463, a 16-bit delta sigma ADC that integrates a precision reference in tiny 12-lead 3mm x 3mm DFN and 4mm 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 2-wire I2C interface and is a complete analog solution for portable sensors, compact systems or power supply monitoring.

Operating from a single 2.7V to 5.5V supply, the LTC2463 measures a ±1.25V differential input range at output rates up to 60Hz, making it easy to measure 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% 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 a proprietary input sampling network that reduces the dynamic input current to less than 50nA, enabling a wide range of external input protection and filter circuits.

The LTC2463 is offered alongside the LTC2461, a 16-bit I2C ADC that measures single-ended inputs between 0V and 1.25V. The LTC2463 and LTC2461 join the previously released LTC2453 (differential input, ±5V) and LTC2451 (single-ended input, 0V to 5V).