I2C ADC Guarantees 16-Bit Performance from 3mm x 2mm Package

22nd February 2008

ES Admin

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Linear Technology has introduced the LTC2453, a 16-bit I2C-compatible delta sigma analog-to-digital converter (ADC) in an ultra-tiny 3mm x 2mm DFN package. Its tiny size, low power and guaranteed 16-bit resolution improves performance of portable instruments and sensors. Operating from a single 2.7V to 5.5V supply, the LTC2453 is capable of measuring a differential input up to ±VCC. This wide input range is ideal for measuring a wide variety of single-ended or differential sensors.

In only 6mm2 area, the versatile LTC2453 achieves excellent 16-bit DC performance of 2LSB integral nonlinearity error, 1.4uVRMS transition noise and 0.01% gain error. The LTC2453 has an internal oscillator and allows up to 60 conversions per second, making it easy to measure temperature, pressure, voltage, or other low-frequency sensor outputs. The LTC2453 draws 800uA of supply current at the 60Hz maximum sample rate. After each conversion, supply current is reduced to less than 0.2uA, further preserving battery power. If the user samples the device once a second, the LTC2453 dissipates only 40uW from a 3V supply.

The LTC2453 communicates via a simple I2C-compatible 2-wire interface, reducing the number of I/O lines required to read data, making the LTC2453 ideal for tiny, space-constrained applications. The LTC2453 includes continuous internal offset and full-scale calibration of the input signal, ensuring accuracy over time and over the full operating temperature range. Linear’s No Latency Delta Sigma™ design allows the ADC to multiplex several inputs with no delay in reading the output data. The LTC2453 incorporates a proprietary sampling network that reduces the dynamic input current to less than 50nA, making a wide range of external input protection and filter circuits possible.

The LTC2453 is available today in both commercial and industrial temperature grade versions.