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16-Channel, 24-Bit Analog-to-Digital Converter (Rev. E)
Texas Instruments
Description
The ADS1258 is a 16-channel (multiplexed), low-noise, 24-bit, delta-sigma () 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 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 32.768kHz 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 ADS1258 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 ADS1258 is available in a QFN-48 package.
Features
24 Bits, No Missing CodesFixed-Channel or Automatic Channel ScanFixed-Channel Data Rate: 125kSPSAuto-Scan Data Rate: 23.7kSPS/ChannelSingle-Conversion Settled Data16 Single-Ended or 8 Differential InputsUnipolar (+5V) or Bipolar (±2.5V) Operation Low Noise: 2.8µVRMS at 1.8kSPS0.0003% Integral NonlinearityDC Stability (typical):0.02µV/°C Offset Drift, 0.4ppm/°C Gain DriftOpen-Sensor DetectionConversion Control PinMultiplexer Output for External Signal ConditioningOn-Chip Temperature, Reference, Offset, Gain, and Supply Voltage Readback42mW Power DissipationStandby, Sleep, and Power-Down Modes8 General-Purpose Inputs/Outputs (GPIO)32.768kHz Crystal Oscillator or External ClockAPPLICATIONSMedical, Avionics, and Process ControlMachine and System MonitoringFast Scan Multi-Channel Instrumentation Industrial SystemsTest and Measurement Systems 2SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.
Related Datasheets
| Part Number | Description | Category |
| • ADS1232 | 24-Bit Analog-to-Digital Converter for Bridge Sensors (Rev. F) | Data Conversion |
| • ADS1252 | 24-Bit, 40kHz Analog-to-Digital Converter (Rev. D) | Data Conversion |
| • ADS1254 | 24-Bit, 20kHz, Low Power Analog-to-Digital Converter (Rev. B) | Data Conversion |
| • ADS1255 | Very Low Noise, 24-Bit Analog-to-Digital Converter (Rev. I) | Data Conversion |
| • ADS1256 | Very Low Noise, 24-Bit Analog-to-Digital Converter (Rev. I) | Data Conversion |
| • ADS1271 | 24-Bit, Wide Bandwidth Analog-to-Digital Converter (Rev. F) | Data Conversion |
| • ADS1274 | Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters (Rev. A) | Data Conversion |
| • ADS1278 | Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters (Rev. A) | Data Conversion |
| • ADS1282 | High-Resolution Analog-to-Digital Converter (Rev. B) | Data Conversion |
| • OPA277 | High Precision Operational Amplifiers (Rev. A) | Amplifier/Conditioner |
| • OPA333 | 1.8V, microPOWER CMOS Operational Amplifiers Zero-Drift Series (Rev. C) | Amplifier/Conditioner |
| • REF5025 | Low-Noise, Very Low Drift, Precision Voltage Reference | Power IC |
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