Operating from a single 2.7V to 5.5V supply, these ADCs are designed to measure single-ended (LTC2470) or differential (LTC2472) sensors via an SPI serial interface. With its internal 1.25V reference, the LTC2470 can measure a single-ended input between 0V and 1.25V, while the LTC2472 is capable of measuring a differential input up to ±1.25V.
The versatile LTC2470/LTC2472 achieve excellent 16-bit DC performance of 2LSB (typ) integral nonlinearity error at 250sps, 3µVRMS transition noise and 0.25% gain error (max). An internal oscillator eliminates the need for external components to perform conversions.
The LTC2470/LTC2472 draw 3.5mA supply current during a conversion. After each conversion, the ADC enters a nap mode, reducing supply current to less than 1.5mA (max). Supply current can be further reduced by placing the converter in sleep mode to achieve less than 2µA(max). The LTC2470/LTC2472 also incorporate a proprietary input sampling network that reduces the dynamic input current to less than 50nA, making a wide range of external input protection and filter circuits possible.