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ADS1278-SP

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Radiation Hardened 24-Bit 8-Ch Simultaneous-Sampling Delta-Sigma ADC

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Data sheet

ADS1278-SP

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 24 Number of input channels 8 Sample rate (Max) (kSPS) 128 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Simultaneous Sampling Rating Space Reference mode Ext Input range (Max) (V) 5.25 Input range (Min) (V) 0 Features Daisy-Chainable Operating temperature range (C) -55 to 115, -55 to 125, 25 to 25 Power consumption (Typ) (mW) 530 Analog voltage AVDD (Min) (V) 4.75 SNR (dB) 111 Analog voltage AVDD (Max) (V) 5.25 INL (Max) (+/-LSB) 201.4 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 2.2
Resolution (Bits) 24 Number of input channels 8 Sample rate (Max) (kSPS) 128 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Simultaneous Sampling Rating Space Reference mode Ext Input range (Max) (V) 5.25 Input range (Min) (V) 0 Features Daisy-Chainable Operating temperature range (C) -55 to 115, -55 to 125, 25 to 25 Power consumption (Typ) (mW) 530 Analog voltage AVDD (Min) (V) 4.75 SNR (dB) 111 Analog voltage AVDD (Max) (V) 5.25 INL (Max) (+/-LSB) 201.4 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 2.2
CFP (TBAR) (HFQ) 84 190 mm² 13.8 x 13.8
  • Radiation Hardened
    • TID 75 krad(Si)
    • TID Radiation Lot Acceptance Test (RLAT) TBD
    • Single Event Latchup (SEL) Immune to LET 68 MeV-cm2/mg @ 125°C
  • Simultaneously Samples Eight Channels
  • Up to 128-kSPS Data Rate
  • AC Performance:
    • 63-kHz Bandwidth
    • 111-dB SNR (High-Resolution Mode)
    • –108-dB THD
  • DC Accuracy:
    • 0.8-µV/°C Offset Drift
    • 1.3-ppm/°C Gain Drift
  • Selectable Operating Modes:
    • High-Speed: 128 kSPS, 106-dB SNR
    • High-Resolution: 52 kSPS, 111-dB SNR
    • Low-Power: 52 kSPS, 31 mW/ch
    • Low-Speed: 10 kSPS, 7 mW/ch
  • Linear Phase Digital Filter
  • SPI™ or Frame-Sync Serial Interface
  • Low Sampling Aperture Error
  • Modulator Output Option (Digital Filter Bypass)
  • Analog Supply: 5 V
  • Digital Core: 1.8 V
  • I/O Supply: 1.8 V to 3.3 V
  • Radiation Hardened
    • TID 75 krad(Si)
    • TID Radiation Lot Acceptance Test (RLAT) TBD
    • Single Event Latchup (SEL) Immune to LET 68 MeV-cm2/mg @ 125°C
  • Simultaneously Samples Eight Channels
  • Up to 128-kSPS Data Rate
  • AC Performance:
    • 63-kHz Bandwidth
    • 111-dB SNR (High-Resolution Mode)
    • –108-dB THD
  • DC Accuracy:
    • 0.8-µV/°C Offset Drift
    • 1.3-ppm/°C Gain Drift
  • Selectable Operating Modes:
    • High-Speed: 128 kSPS, 106-dB SNR
    • High-Resolution: 52 kSPS, 111-dB SNR
    • Low-Power: 52 kSPS, 31 mW/ch
    • Low-Speed: 10 kSPS, 7 mW/ch
  • Linear Phase Digital Filter
  • SPI™ or Frame-Sync Serial Interface
  • Low Sampling Aperture Error
  • Modulator Output Option (Digital Filter Bypass)
  • Analog Supply: 5 V
  • Digital Core: 1.8 V
  • I/O Supply: 1.8 V to 3.3 V

The ADS1278-SP (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128k samples per second (SPS), allowing simultaneous sampling of eight channels.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1278-SP combines these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.

The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple.

Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The device is fully specified over the extended temperature range of –55°C to 125°C and is available in an 84-pin HFQ package.

The ADS1278-SP (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128k samples per second (SPS), allowing simultaneous sampling of eight channels.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1278-SP combines these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.

The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple.

Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The device is fully specified over the extended temperature range of –55°C to 125°C and is available in an 84-pin HFQ package.
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Technical documentation

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Type Title Date
* Data sheet ADS1278-SP Radiation Hardened 8-Ch Simultaneous-Sampling 24-Bit Analog-to-Digital Converter datasheet (Rev. B) PDF | HTML 27 Dec 2018
* Radiation & reliability report ADS1278-SP Production Flow and Reliability Report PDF | HTML 08 Jul 2022
* Radiation & reliability report ADS1278-SP Total Ionizing Dose (TID) HDR (Rev. A) 01 Aug 2019
* Radiation & reliability report Single-Event Effects Test Report of the ADS1278-SP Octal, 24-Bit ADC 10 Oct 2018
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. A) PDF | HTML 17 Nov 2022
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Application note Analog Front-End Design With Texas Instruments’ Tooling Landscape PDF | HTML 07 Mar 2022
Selection guide TI Space Products (Rev. I) 03 Mar 2022
E-book Fundamentals of Precision ADC Noise Analysis 19 Jun 2020
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing 17 Jun 2019
EVM User's guide ADS1278EVM-CVAL Evaluation Module User's Guide 12 Sep 2018
Application note Digital Filter Types in Delta-Sigma ADCs PDF | HTML 27 Jun 2017
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) 13 Mar 2015

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 (...)

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Evaluation board

ADS1278EVM-CVAL — ADS1278-SP Radiation Hardened Evaluation Module

The ADS1278EVM-CVAL kit is a complete evaluation/demonstration kit, which combines ADS1278EVM-CVAL with the DSP-based MMB0 board as a motherboard. The mother board and the ADCPro™ evaluation software are supplied for use with a personal computer running Microsoft™ Windows operating (...)
User guide: PDF
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Support software

ADS1278EVM-CVAL GUI

SBAC211.ZIP (5001 KB)
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Simulation model

ADS1278-SP IBIS Model

SCAM065.ZIP (46 KB) - IBIS Model
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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

ADS1X7X-EXCEL-CALC-TOOL — ADS1x7x Excel™ Calculator Tool

    The ADS1x7x Excel calculator tool provides the user with several easy-to-use tools to simplify the configuration of ADS1x7x devices. The tool helps the user understand different settings and operating modes that aid in optimizing a design with ADS1x7x wide-bandwidth analog-to-digital converters (...)
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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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CFP (HFQ) 84 View options

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