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ADS1258

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24-bit, 125kSPS, 16-ch delta-sigma ADC with fast channel scan and automatic sequencer

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Data sheet

ADS1258

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 24 Sample rate (max) (ksps) 125 Number of input channels 16 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 2.85, 5.35 Input voltage range (min) (V) -2.7, 0 Features GPIO, Oscillator Operating temperature range (°C) -40 to 105 Power consumption (typ) (mW) 42 Analog supply (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.25
Resolution (Bits) 24 Sample rate (max) (ksps) 125 Number of input channels 16 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External Input voltage range (max) (V) 2.85, 5.35 Input voltage range (min) (V) -2.7, 0 Features GPIO, Oscillator Operating temperature range (°C) -40 to 105 Power consumption (typ) (mW) 42 Analog supply (min) (V) 4.75 Analog supply voltage (max) (V) 5.25 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.25
VQFNP (RTC) 48 49 mm² 7 x 7
  • 24 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) Operation
  • Low Noise: 2.8µVRMS at 1.8kSPS
  • 0.0003% Integral Nonlinearity
  • DC Stability (typical):
    0.02µV/°C Offset Drift, 0.4ppm/°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
  • 8 General-Purpose Inputs/Outputs (GPIO)
  • 32.768kHz Crystal Oscillator or External Clock
  • APPLICATIONS
    • Medical, Avionics, and Process Control
    • Machine and System Monitoring
    • Fast Scan Multi-Channel Instrumentation
    • Industrial Systems
    • Test and Measurement Systems

SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.
  • 24 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) Operation
  • Low Noise: 2.8µVRMS at 1.8kSPS
  • 0.0003% Integral Nonlinearity
  • DC Stability (typical):
    0.02µV/°C Offset Drift, 0.4ppm/°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
  • 8 General-Purpose Inputs/Outputs (GPIO)
  • 32.768kHz Crystal Oscillator or External Clock
  • APPLICATIONS
    • Medical, Avionics, and Process Control
    • Machine and System Monitoring
    • Fast Scan Multi-Channel Instrumentation
    • Industrial Systems
    • Test and Measurement Systems

SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.

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.

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.
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Technical documentation

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Type Title Date
* Data sheet 16-Channel 24-Bit Analog-to-Digital Converter datasheet (Rev. G) 28 Mar 2011
Application note Digital Filter Types in Delta-Sigma ADCs (Rev. A) PDF | HTML 29 Mar 2023
Application note Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs PDF | HTML 23 Mar 2022
Application note A Basic Guide to Bridge Measurements PDF | HTML 18 Feb 2022
E-book Fundamentals of Precision ADC Noise Analysis 19 Jun 2020
Application note QFN and SON PCB Attachment (Rev. B) PDF | HTML 24 Aug 2018
EVM User's guide ADS1158EVM, ADS1258EVM User's Guide (Rev. D) 14 May 2016
E-book Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs 19 Mar 2015
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) 13 Mar 2015
Technical article Delta-sigma ADC basics: Walking around the delta-sigma blocks 03 Mar 2015
Application note ADS1258, ADS1258-EP, and ADS1158 SPI™ Timeout Function 20 Apr 2012
Application note Analog Front-End Design for ECG Systems Using Delta-Sigma ADCs (Rev. A) 13 Apr 2010
Analog Design Journal Conversion latency in delta-sigma converters 12 Jan 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ADCPRO — Analog-to-digital converter pro (ADCPro™) evaluation software

ADCPro™ is a modular software system for evaluating analog-to-digital converters (ADCs) without the need for expensive logic analyzers and complex analysis routines. Used alone it is suitable for performing analysis on data sets captured from ADC testing; when paired with a Texas Instruments (...)

User guide: PDF
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Development kit

ADS1258EVM-PDK — ADS1258 Performance Demonstration Kit

For use with a personal computer, the ADS1258EVM-PDK is available. This kit combines the ADS1258EVM board with the DSP-based MMB0 motherboard, and includes ADCPro™ software for evaluation. The MMB0 mother board allows the ADS1258EVM to be connected to the computer via an available USB port. (...)

User guide: PDF
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Support software

ADS1258 Example C Code (Rev. A)

SBAC222A.ZIP (59 KB)
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Calculation tool

ADC-INPUT-CALC — Analog-to-digital converter (ADC) input driver design tool supporting multiple input types

ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and (...)
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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VQFNP (RTC) 48 View options
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