ADS1255

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24-Bit, 30kSPS, Very-Low-Noise Delta-Sigma ADC

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 2 Sample rate (Max) (kSPS) 30 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext Input range (Max) (V) 5.25 Input range (Min) (V) 0 Features 50/60 Hz Rejection, GPIO, PGA Operating temperature range (C) -40 to 85 Power consumption (Typ) (mW) 36 Analog voltage AVDD (Min) (V) 4.75 Analog voltage AVDD (Max) (V) 5.25 Digital supply (Min) (V) 1.8 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

SSOP (DB) 20 38 mm² 5.3 x 7.2 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • 24 Bits, No Missing Codes
    • All Data Rates and PGA Settings
  • Up to 23 Bits Noise-Free Resolution
  • ±0.0010% Nonlinearity (max)
  • Data Output Rates to 30kSPS
  • Fast Channel Cycling
    • 18.6 Bits Noise-Free (21.3 Effective Bits) at 1.45kHz
  • One-Shot Conversions with Single-Cycle Settling
  • Flexible Input Multiplexer with Sensor Detect
    • Four Differential Inputs (ADS1256 only)
    • Eight Single-Ended Inputs (ADS1256 only)
  • Chopper-Stabilized Input Buffer
  • Low-Noise PGA: 27nV Input-Referred Noise
  • Self and System Calibration for All PGA Settings
  • 5V Tolerant SPI™-Compatible Serial Interface
  • Analog Supply: 5V
  • Digital Supply: 1.8V to 3.6V
  • Power Dissipation
    • As Low as 38mW in Normal Mode
    • 0.4mW in Standby Mode
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Description

The ADS1255 and ADS1256 are extremely low-noise, 24-bit analog-to-digital (A/D) converters. They provide complete high-resolution measurement solutions for the most demanding applications.

The converter is comprised of a 4th-order, delta-sigma (ΔΣ) modulator followed by a programmable digital filter. A flexible input multiplexer handles differential or single-ended signals and includes circuitry to verify the integrity of the external sensor connected to the inputs. The selectable input buffer greatly increases the input impedance and the low-noise programmable gain amplifier (PGA) provides gains from 1 to 64 in binary steps. The programmable filter allows the user to optimize between resolution of up to 23 bits noise-free and data rate of up to 30k samples per second (SPS). The converters offer fast channel cycling for measuring multiplexed inputs and can also perform one-shot conversions that settle in just a single cycle.

Communication is handled over an SPI-compatible serial interface that can operate with a 2-wire connection. Onboard calibration supports both self and system correction of offset and gain errors for all the PGA settings. Bidirectional digital I/Os and a programmable clock output driver are provided for general use. The ADS1255 is packaged in an SSOP-20, and the ADS1256 in an SSOP-28.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet Very Low Noise, 24-Bit Analog-to-Digital Converter datasheet (Rev. K) Sep. 17, 2013
White papers Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
User guides ADS1256EVM and ADS1256EVM-PDK (Rev. E) Nov. 14, 2018
Application notes Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
Technical articles Help! My data converter’s giving bad data! What’s wrong? Aug. 07, 2015
Application notes Measuring Single-Ended 0V-5V Signals with Differential Delta-Sigma ADCs (Rev. A) May 18, 2015
White papers Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
Application notes Seismic Sensor Demonstration Using an ADS1255 and TMS320VC5510A DSP (Rev. A) Jan. 29, 2009
Application notes Using Ceramic Resonators with the ADS1255/6 Jul. 09, 2004

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
Description

The ADS1256EVM-PDK is a complete evaluation/demonstration kit, which combines the ADS1256EVM with the DSP-based MMB0 motherboard for use with a personal computer. The MMB0 motherboard allows the ADS1256EVM to connect to a computer via a USB port. The ADS1256EVM-PDK is controlled by the ADCPro&trade (...)

Features
  • Easy-to-use evaluation software for Microsoft™ Windows XP and Windows 7
  • Built-in analysis tools including scope, FFT, and histogram displays
  • Data collection to ASCII text files
  • Complete control of board settings
  • Easily expandable with new analysis plug in tools from Texas Instruments
EVALUATION BOARDS Download
document-generic User guide
8499
Description

 

The DLP NIRscan is a complete evaluation module (EVM) to design a high performance, affordable near-infrared spectrometer.  This flexible tool contains everything a designer needs to start developing a DLP-based spectrometer right out of the box.  The EVM features the DLP 0.45 WXGA NIR (...)

Features

The DLP® NIRscan™ evaluation module includes the key features highlighted below. For mobile sensing, check out the DLP NIRscan Nano evaluation module. The table compares the key specifications of both evaluation modules.

  High Performance EVM MobileSensing EVM
Key Features DLP NIRscan DLP NIRscan Nano
(...)

Design tools & simulation

SIMULATION MODELS Download
SBAM108.ZIP (72 KB) - IBIS Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide
CALCULATION TOOLS Download
Analog-to-digital converter (ADC) input driver design tool supporting multiple input types
ADC-INPUT-CALC 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 transformer-coupled (...)
CALCULATION TOOLS Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
CALCULATION TOOLS Download
SBAC145.ZIP (829 KB)

Reference designs

REFERENCE DESIGNS Download
DLP Ultra-mobile NIR Spectrometer for Portable Chemical Analysis with Bluetooth Connectivity
TIDA-00554 The ultra-mobile near-infrared (NIR) spectrometer reference design utilizes Texas Instruments' DLP technology in conjunction with a single-element InGaAs detector to deliver high performance measurements in a portable form factor that is more affordable than architectures using an expensive InGaAs (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
DLP Near-Infrared Spectrometer for Optical Analysis of Liquids & Solids Reference Design
TIDA-00155 This near-infrared (NIR) spectrometer reference design utilizes Texas Instruments' DLP technology in conjunction with a single-element InGaAs detector to deliver high performance measurements in a portable form factor that is more affordable than expensive InGaAs array detector or fragile rotating (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SSOP (DB) 20 View options

Ordering & quality

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