描述The ADS1158 is a 16-channel (multiplexed), low-noise, 16-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) that provides single-cycle settled data at channel scan rates from 1.8k to 23.7k samples per second (SPS) per channel. A flexible input multiplexer accepts combinations of eight differential or 16 single-ended inputs with a full-scale differential range of 5V or true bipolar range of ±2.5V when operating with a 5V reference. The fourth-order delta-sigma modulator is followed by a fifth-order sinc digital filter optimized for low-noise performance. The differential output of the multiplexer is accessible to allow signal conditioning before the input of the ADC. Internal system monitor registers provide supply voltage, temperature, reference voltage, gain, and offset data.An onboard PLL generates the system clock from a 32.768kHz crystal, or can be overridden by an external clock source. A buffered system clock output (15.7MHz) is provided to drive a microcontroller or additional converters. Serial digital communication is handled via an SPI?-compatible interface. A simple command word structure controls channel configuration, data rates, digital I/O, monitor functions, etc. Programmable sensor bias current sources can be used to bias sensors or verify sensor integrity. The ADS1158 operates from a unipolar +5V or bipolar ±2.5V analog supply and a digital supply compatible with interfaces ranging from 2.7V to 5.25V. The ADS1158 is available in a QFN-48 package.特性16 Bits, No Missing Codes Fixed-Channel or Automatic Channel Scan Fixed-Channel Data Rate: 125kSPS Auto-Scan Data Rate: 23.7kSPS/Channel Single-Conversion Settled Data 16 Single-Ended or 8 Differential Inputs Unipolar (+5V) or Bipolar (±2.5V) Operation0.3LSB (INL) DC Stability: 1μV/°C Offset Drift, 2ppm/°C Gain Drift Open-Sensor Detection Conversion Control Pin Multiplexer Output for External Signal Conditioning On-Chip Temperature, Reference, Offset, Gain, and Supply Voltage Readback 42mW Power Dissipation Standby, Sleep, and Power-Down Modes Eight General-Purpose Inputs/Outputs (GPIO) 32.768kHz Crystal Oscillator or External ClockAPPLICATIONS Medical, Avionics, and Process Control Machine and System Monitoring Fast Scan Multi-Channel InstrumentationIndustrial Systems Test and Measurement SystemsSPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.