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ADS8881

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18-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

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18-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

ADS8881

ACTIVE
Data sheet Order now

Product details

Parameters

Resolution (Bits) 18 Number of input channels 1 Sample rate (Max) (kSPS) 1000 Interface type SPI Architecture SAR Input type Differential Multi-channel configuration — Rating Catalog Reference mode Ext Input range (Max) (V) 5 Input range (Min) (V) -5 Features Daisy-Chainable, Oscillator, Small Size Operating temperature range (C) -40 to 85, 0 to 70 Power consumption (Typ) (mW) 5.5 Analog voltage AVDD (Min) (V) 2.7 SNR (dB) 100 Analog voltage AVDD (Max) (V) 3.6 INL (Max) (+/-LSB) 2 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Sample Rate: 1 MHz
  • No Latency Output
  • Unipolar, True-Differential Input Range:
    –VREF to +VREF
  • Wide Common-Mode Voltage Range:
    0 V to VREF with 90-dB CMRR (min)
  • SPI™-Compatible Serial Interface with
    Daisy-Chain Option
  • Excellent AC and DC Performance:
    • ADS8881C:
      INL: ±1 LSB (typ), ±2.0 LSB (max)
      DNL: ±1.0 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
    • ADS8881I:
      INL: ±1.5 LSB (typ), ±3.0 LSB (max)
      DNL: +1.5 and –1 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
  • Wide Operating Range:
    • AVDD: 2.7 V to 3.6 V
    • DVDD: 2.7 V to 3.6 V
      (Independent of AVDD)
    • REF: 2.5 V to 5 V (Independent of AVDD)
    • Operating Temperature:
      ADS8881C : 0°C to +70°C
      ADS8881I : –40°C to +85°C
  • Low-Power Dissipation:
    • 5.5 mW at 1 MSPS
    • 0.55 mW at 100 kSPS
    • 55 µW at 10 kSPS
  • Power-Down Current (AVDD): 50 nA
  • Full-Scale Step Settling to 18 Bits: 290 ns
  • Packages: MSOP-10 and VSON-10
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Description

The ADS8881 is an 18-bit, 1-MSPS, true-differential input, analog-to-digital converter (ADC). The device operates with a 2.5-V to 5-V external reference, offering a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD).

The device offers an SPI-compatible serial interface that also supports daisy-chain operation for cascading multiple devices. An optional busy-indicator bit makes synchronizing with the digital host easy.

The device supports unipolar, true-differential analog input signals with a differential input swing of –VREF to VREF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to VREF (when both inputs are within the operating input range of –0.1 V to VREF + 0.1 V).

Device operation is optimized for very low-power operation. Power consumption directly scales with speed. This feature makes the ADS8881 excellent for lower-speed applications.

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Technical documentation

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Type Title Date
* Datasheet ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter datasheet (Rev. D) Aug. 11, 2015
Application note Circuit for protecting low-voltage SAR ADC from electrical overstress with minim May 25, 2019
User guide ADS8881EVMV2-PDK User's Guide (Rev. A) Oct. 04, 2017
E-book Tips and tricks for designing with voltage references May 30, 2017
User guide ADS8881EVMV2-PDK User's Guide May 08, 2017
White paper Voltage-reference impact on total harmonic distortion Aug. 01, 2016
More literature SAR ADCs for PLC Applications Feb. 11, 2016
E-book Best of Baker's Best: Precision Data Converters -- SAR ADCs May 21, 2015
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) Mar. 13, 2015
Technical article SAR ADC response times: Interface topology makes a difference (Part 2) Feb. 13, 2015
Technical article SAR ADC Response Times: Respond quickly, control quickly Oct. 17, 2014
Technical article SAR ADC PCB Layout: The reference path Jul. 25, 2014
User guide ADS8881EVM User's Guide Jun. 06, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description
The ADS8881EVMV2-PDK is an evaluation platform for the ADS8881 successive approximation register (SAR) analog-to-digital converter (ADC). The evaluation kit includes the ADS8881 EVMV2 board, the PHI controller board, and accompanying computer software that enables the user to communicate with (...)
Features
  • Includes hardware and software required for diagnostic testing, as well as accurate performance evaluation of the ADS8881 ADC
  • No external power supply needed
  • Ships with PHI EVM controller, which provides convenient interface to the EVM over USB 2.0 (or higher) for power delivery and digital interface
  • (...)
View details
EVALUATION BOARD Download
document-generic User guide
99
Description

The precision signal injector (PSI) is a platform for evaluating the performance of successive-approximation register (SAR) analog-to-digital converters (ADCs). The board provides a low-distortion, low-noise, 2-kHz input signal for driving the input of the ADC, and pairs with most of the (...)

Features
  • PSI software GUI has graphical tool for controlling amplitude, frequency, and offset of AC signal
  • Onboard filter for generating very-low distortion, low-noise, 2-kHz signal
  • Jumper-selectable options for filtering and offset-/common-mode voltage
  •  Single-ended or true differential-signal output options
  • (...)
View details
EVALUATION BOARD Download
document-generic User guide
149
Description
The REF6025EVM-PDK is a platform for evaluating the performance of the REF6025 voltage reference. The evaluation kit brings out the burst mode performance of the device which is a key feature of the device.
Features
  • TI’s first ultra-high precision reference
  • Introduces ADC drive buffer which is an integrated high bandwidth, output impedance buffer that helps achieve the lowest distortion, ultra-low-noise data acquisition systems
  • Introduces burst mode data acquisition with first-sample correct to 18-bit (...)
View details

Design tools & simulation

SIMULATION MODEL Download
SBAM172.ZIP (35 KB) - IBIS Model
SIMULATION MODEL Download
SBAM173.TSC (2271 KB) - TINA-TI Reference Design
SIMULATION TOOL 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
  • (...)
View details
SIMULATION TOOL 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 TOOL 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 TOOL 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
  • (...)
View details

Reference designs

REFERENCE DESIGNS Download
Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18 bit, 1Msps Reference Design
TIPD115 — This TI Verified Design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest noise & distortion solution for a full scale input sinewave of 10 KHz. This leads to a maximum possible (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Data Acquisition for 10kHz AC, 35mW, 18 bit, 1Msps Reference Design
TIPD113 — This TI Verified Design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest power solution for a full scale input sine wave of 10 KHz. At a total power consumption of less than 35mW, this (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Data Acquisition for MUX and Step Inputs, 18 bits, 1uS Full Scale Response Reference Design
TIPD112 — This TI Verified Design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide 18-bit settling performance for a Full Scale Step Input signal, thus leading to excellent system linearity. Such an input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Data Acquisition Block for ECG Systems, discrete LEAD I ECG implementation Reference Design
TIPD116 — This TI Verified Design is for Electrocardiography (ECG), the measurement of the electrical activity of the heart, a method that requires a precision analog front end instrumentation gain stage, filtering, and high resolution digital conversion. This design features the methodology for achieving a (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Data Acquisition at 1KHz AC, 1mW, 18bit, 1Msps Reference Design
TIPD114 — This TI Verified Design provides results of a low power, low throughput use case of ADS8881. One of the ways to reduce power for a low throughput application is to select a high throughput (1 MSPS) part and run it at low speed. The power consumed by ADS8881 is 55uW for 10kSPS. The reference drive (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSON (DRC) 10 View options
VSSOP (DGS) 10 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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