描述The ADS1245 is a 24-bit, delta-sigma analog-to-digital converter (ADC). It offers excellent performance and very low power in an MSOP-10 package and is well suited for demanding high-resolution measurements, especially in portable and other space- and power-constrained systems. The buffered input presents an impedance of 3G, minimizing measurement errors when using high-impedance sources. The ADS1245 is compatible with ADS1244 and offers a direct upgrade path for designs requiring higher input impedance. A third-order delta-sigma () modulator and digital filter form the basis of the ADC. The analog modulator has a ±2.5V differential input range. The digital filter rejects both 50Hz and 60Hz signals, completely settles in one cycle, and outputs data at 15 samples per second (SPS). A simple, two-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Sleep mode are handled with a few simple waveforms. When only single conversions are needed, the ADS1245 can be shut down (Sleep mode) while idle between measurements to dramatically reduce the overall power dissipation. Multiple ADS1245s can be connected together to create a synchronously sampling multichannel measurement system. The ADS1245 is designed to easily connect to microcontrollers, such as the MSP430. The ADS1245 supports 2.5V to 5.25V analog supplies and 1.8V to 3.6V digital supplies. Power is typically less than 470µW in normal operation and less than 1µW during Sleep mode.特性20-Bit Effective Resolution High-Impedance Buffered Input ±2.5V Differential Input Range Pin-Compatible with ADS1244 0.0006% INL (typ), 0.0015% INL (max) Simple Two-Wire Serial Interface Simultaneous 50Hz and 60Hz Rejection Single Conversions with Sleep Mode Single-Cycle Settling Self-Calibration Well Suited for Multi-Channel Systems Easily Connects to the MSP430 Current Consumption: 158µA Analog Supply: 2.5V to 5.25V Digital Supply: 1.8V to 3.6V APPLICATIONS Hand-Held Instrumentation Portable Medical Equipment Industrial Process Control Test and Measurement SystemsAll trademarks are the property of their respective owners.