LTC2450 Easy-to-Use, Ultra-Tiny 16-Bit ΔΣ ADC FEATURESDESCRIPTION n GND to V The LTC®2450 is an ultra-tiny 16-bit analog-to-digital CC Single-Ended Input Range n 0.02LSB RMS Noise converter. The LTC2450 uses a single 2.7V to 5.5V supply, n 2LSB INL, No Missing Codes accepts a single-ended analog input voltage, and commu- n 2LSB Offset Error nicates through an SPI interface. It includes an integrated n 4LSB Full-Scale Error oscillator that does not require any external components. n Single Conversion Settling Time for Multiplexed It uses a delta-sigma modulator as a converter core and Applications provides single-cycle settling time for multiplexed applica- n Single Cycle Operation with Auto Shutdown tions. The converter is available in a 6-pin, 2mm × 2mm n 350μA Supply Current DFN package. The internal oscillator does not require any n 50nA Sleep Current external components. The LTC2450 includes a proprietary n 30 Conversions Per Second input sampling scheme that reduces the average input n Internal Oscillator—No External Components sampling current several orders of magnitude. Required The LTC2450 is capable of up to 30 conversions per sec- n Single Supply, 2.7V to 5.5V Operation ond and, due to the very large oversampling ratio, has n SPI Interface extremely relaxed antialiasing requirements. The LTC2450 n Ultra-Tiny 2mm × 2mm DFN Package includes continuous internal offset and full-scale calibra- APPLICATIONS tion algorithms which are transparent to the user, ensuring accuracy over time and over the operating temperature n System Monitoring range. The converter uses its power supply voltage as the n Environmental Monitoring reference voltage and the single-ended, rail-to-rail input n Direct Temperature Measurements voltage range extends from GND to VCC. n Instrumentation Following a conversion, the LTC2450 can automatically n Industrial Process Control enter a sleep mode and reduce its power to less than n Data Acquisition 200nA. If the user samples the ADC once a second, the n Embedded ADC Upgrades LTC2450 consumes an average of less than 50μW from L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. East Drive a 2.7V supply. is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6208279, 6411242, 7088280, 7164378. TYPICAL APPLICATIONIntegral Nonlinearity, VCC = 3V 3.0 VCC = VREF = 3V 2.5 2.0 0.1μF 10μF 1.5 1.0 0.5 VCC CS CLOSE TO 0 TA = –45°C, 25°C, 90°C 1k CHIP SCK 3-WIRE SPI INL (LSB) –0.5 VIN LTC2450 INTERFACE SDO –1.0 SENSE 0.1μF –1.5 GND 2450 TA01 –2.0 –2.5 –3.0 0 0.5 1.0 1.5 2.0 2.5 3.0 INPUT VOLTAGE (V) 2450 G02 2450fb 1
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