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ADS1258IPHPREP Datasheet(PDF) 1 Page - Texas Instruments |
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ADS1258IPHPREP Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 57 page  ADS1258 ADS1258-EP www.ti.com SBAS445C – MARCH 2009 – REVISED DECEMBER 2009 16-CHANNEL, 24-BIT ANALOG-TO-DIGITAL CONVERTER Check for Samples: ADS1258-EP 1 FEATURES APPLICATIONS • Medical, Avionics, and Process Control 23 • 24 Bits, No Missing Codes • Machine and System Monitoring • Fixed-Channel or Automatic Channel Scan • Fast Scan Multi-Channel Instrumentation • Fixed-Channel Data Rate: 125 kSPS • Industrial Systems • Auto-Scan Data Rate: 23.7 kSPS/Channel • Test and Measurement Systems • Single-Conversion Settled Data • 16 Single-Ended or 8 Differential Inputs SUPPORTS DEFENSE, AEROSPACE, • Unipolar (5 V) or Bipolar (±2.5 V) Operation AND MEDICAL APPLICATIONS • Low Noise: 2.8 μVRMS at 1.8kSPS • Controlled Baseline • 0.0003% Integral Nonlinearity • One Assembly/Test Site • One Fabrication Site • DC Stability (typical): 0.02 μV/°C Offset Drift, 0.4 ppm/°C Gain Drift • Available in Military (–55°C/125°C) and Industrial (–40°C/105°C) Temperature Ranges(1) • Open-Sensor Detection • Extended Product Life Cycle • Conversion Control Pin • Extended Product-Change Notification • Multiplexer Output for External Signal • Product Traceability Conditioning • On-Chip Temperature, Reference, Offset, Gain, and Supply Voltage Readback • 42-mW Power Dissipation • Standby, Sleep, and Power-Down Modes • 8 General-Purpose Inputs/Outputs (GPIO) • 32.768-kHz Crystal Oscillator or External Clock (1) Custom temperature ranges available DESCRIPTION The ADS1258 is a 16-channel (multiplexed), low-noise, 24-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 5 V or true bipolar range of ±2.5 V when operating with a 5-V 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 prior to 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 32.768-kHz crystal, or can be overridden by an external clock source. A buffered system clock output (15.7 MHz) 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 ADS1258 operates from a unipolar 5-V or bipolar ±2.5-V analog supply and a digital supply compatible with interfaces ranging from 2.7 V to 5.25 V. The ADS1258 is available in QFN-48 and QFP-48 packages. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SPI is a trademark of Motorola, Inc. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2009, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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