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ADS1258IPHPREP bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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ADS1258IPHPREP bảng dữ liệu(HTML) 1 Page - Texas Instruments |
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1 / 59 page  ADS1258 ADS1258-EP www.ti.com SBAS445D – MARCH 2009 – REVISED MARCH 2011 16-CHANNEL, 24-BIT ANALOG-TO-DIGITAL CONVERTER Check for Samples: ADS1258-EP 1 FEATURES 23 • 24 Bits, No Missing Codes APPLICATIONS • Fixed-Channel or Automatic Channel Scan • Medical, Avionics, and Process Control • Fixed-Channel Data Rate: 125 kSPS • Machine and System Monitoring • Auto-Scan Data Rate: 23.7 kSPS/Channel • Fast Scan Multi-Channel Instrumentation • Single-Conversion Settled Data • Industrial Systems • 16 Single-Ended or 8 Differential Inputs • Test and Measurement Systems • Unipolar (5 V) or Bipolar ( ±2.5 V) Operation SUPPORTS DEFENSE, AEROSPACE, • Low Noise: 2.8 μVRMS at 1.8 kSPS AND MEDICAL APPLICATIONS • 0.0003% Integral Nonlinearity • Controlled Baseline • DC Stability (typical): • One Assembly/Test Site 0.02 μV/°C Offset Drift, 0.4 ppm/°C Gain Drift • One Fabrication Site • Open-Sensor Detection • Available in Military ( –55°C/125°C) and • Conversion Control Pin Industrial ( –40°C/105°C) Temperature Ranges(1) • Multiplexer Output for External Signal • Extended Product Life Cycle Conditioning • Extended Product-Change Notification • On-Chip Temperature, Reference, Offset, Gain, • Product Traceability 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 © 2009–2011, 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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