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LTC2473 - Selectable 208sps/833sps, 16-Bit I2C ΔΣ ADCs with 10ppm/°C Max Precision Reference

The LTC®2471/LTC2473 are small, 16-bit analog-to-digital converters with an integrated precision reference and a selectable 208sps or 833sps output rate. They use a single 2.7V to 5.5V supply and communicate through an I2C Interface. The LTC2471 is single-ended with a 0V to VREF input range and the LTC2473 is differential with a ±VREF input range. Both ADCs include a 1.25V integrated reference with 2ppm/°C drift performance and 0.1% initial accuracy. The converters are available in a 12-pin DFN 3mm × 3mm package or an MSOP-12 package. They include an integrated oscillator and perform conversions with no latency for multiplexed applications. The LTC2471/ LTC2473 include a proprietary input sampling scheme that reduces the average input current several orders of magnitude when compared to conventional delta sigma converters.

Following a single conversion, the LTC2471/LTC2473 automatically power down the converter and can also be configured to power down the reference. When both the ADC and reference are powered down, the supply current is reduced to 200nA.

The LTC2471/LTC2473 include a user selectable 208sps or 833sps output rate and due to a large oversampling ratio (8,192 at 208sps and 2,048 at 833sps) have relaxed anti-aliasing requirements.

Features 16-Bit Resolution Internal, High Accuracy Reference—10ppm/°C (Max) Single-Ended (LTC2471) or Differential (LTC2473) Selectable 208sps/833sps Output Rate 1mV Offset Error 0.01% Gain Error Single Conversion Settling Time Simplifies Multiplexed Applications Single-Cycle Operation with Auto Shutdown 3.5mA (Typ) Supply Current 2μA (Max) Sleep Current Internal Oscillator—No External Components Required I2C Interface Small 12-Lead, 3mm × 3mm DFN and MSOP Packages Typical Application

Applications System Monitoring Environmental Monitoring Direct Temperature Measurements Instrumentation Industrial Process Control Data Acquisition Embedded ADC Upgrades Packaging

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