LTC2452 Ultra-Tiny, Differential, 16-Bit ∆Σ ADC with SPI Interface FeaTuresDescripTion n ±VCC Differential Input Range The LTC®2452 is an ultra-tiny, fully differential, 16-bit, n 16-Bit Resolution (Including Sign), No Missing analog-to-digital converter. The LTC2452 uses a single Codes 2.7V to 5.5V supply and communicates through an SPI n 2LSB Offset Error interface. The ADC is available in an 8-pin, 3mm × 2mm n 4LSB Full-Scale Error DFN package or TSOT-23 package. It includes an integrated n 60 Conversions Per Second 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 has no latency for multiplexed applications. The LTC2452 n Single-Cycle Operation with Auto Shutdown includes a proprietary input sampling scheme that reduces n 800µA Supply Current the average input sampling current several orders of n 0.2µA Sleep Current magnitude when compared to conventional delta-sigma n Internal Oscillator—No External Components converters. Additionally, due to its architecture, there is Required negligible current leakage between the input pins. n SPI Interface The LTC2452 can sample at 60 conversions per second, n Ultra-Tiny 3mm × 2mm DFN and TSOT-23 Packages and due to the very large oversampling ratio, has extremely applicaTions relaxed anti-aliasing requirements. The LTC2452 includes continuous internal offset and full-scale calibration algo- n System Monitoring rithms which are transparent to the user, ensuring accuracy n Environmental Monitoring over time and over the operating temperature range. The n Direct Temperature Measurements converter has an external REF pin and the differential input n Instrumentation voltage range can extend up to ±VREF . n Industrial Process Control Following a single conversion, the LTC2452 can automati- n Data Acquisition cally enter a sleep mode and reduce its supply current to n Embedded ADC Upgrades less than 0.2µA. If the user reads the ADC once a second, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency ∆Σ is a trademark of Linear Technology Corporation. All other trademarks are the the LTC2452 consumes an average of less than 50µW property of their respective owners. Protected by U.S. Patents, including 6208279, 6411242, from a 2.7V supply. 7088280, 7164378. Typical applicaTionIntegral Nonlinearity, VCC = 3V 3 2.7V TO 5.5V 2 0.1µF 10µF 0.1µF REF VCC 1 IN+ CS TA = –45°C, 25°C, 90°C 10k 10k SCK 3-WIRE SPI 0 IN– LTC2452 INTERFACE INL (LSB) SDO –1 10k R 0.1µF GND –2 2452 TA01a –3–3 –2 –1 0 1 2 3 DIFFERENTIAL INPUT VOLTAGE (V) 2452 TA01b 2452fd For more information www.linear.com/LTC2452 1
