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Precision ADCs (<=10MSPS)

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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Data sheet

ADS8881

ACTIVE
Data sheet Order now

Product details

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) 0 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
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) 0 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
VSON (DRC) 10 9 mm² 3 x 3 VSSOP (DGS) 10 9 mm² 3 x 3
  • 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
  • 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

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.

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
* Data sheet ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter datasheet (Rev. D) PDF | HTML 11 Aug 2015
Application note Understanding and Using SAR ADC SPICE Micromodel PDF | HTML 23 Nov 2021
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Circuit design Circuit for protecting low-voltage SAR ADC from electrical overstress with minim 25 May 2019
User guide ADS8881EVMV2-PDK User's Guide (Rev. A) 04 Oct 2017
User guide ADS8881EVMV2-PDK User's Guide 08 May 2017
White paper Voltage-reference impact on total harmonic distortion 01 Aug 2016
More literature SAR ADCs for PLC Applications 11 Feb 2016
E-book Best of Baker's Best: Precision Data Converters -- SAR ADCs 21 May 2015
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) 13 Mar 2015
Technical article SAR ADC response times: Interface topology makes a difference (Part 2) 13 Feb 2015
Technical article SAR ADC Response Times: Respond quickly, control quickly 17 Oct 2014
Technical article SAR ADC PCB Layout: The reference path 25 Jul 2014
EVM User's guide ADS8881EVM User's Guide 06 Jun 2013

Design & development

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

Evaluation board

ADS8881EVMV2-PDK — ADS8881 18-Bit 1MSPS Serial-Interface SAR ADC Evaluation Module V2 PDK

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 (...)
User guide: PDF
Not available on TI.com
Evaluation board

PSIEVM — Precision Signal Injector (PSI) Evaluation Module for Testing ADC Performance

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 (...)

User guide: PDF
Not available on TI.com
Evaluation board

REF6025EVM-PDK — REF6025 voltage reference evaluation module

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.
User guide: PDF
Not available on TI.com
Simulation model

ADS8881 IBIS Model

SBAM172.ZIP (35 KB) - IBIS Model
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Simulation model

ADS8881 TINA-TI Reference Design

SBAM173.TSC (2271 KB) - TINA-TI Reference Design
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Simulation model

ADS8881 PSpice Model

SBAM462.ZIP (203 KB) - PSpice Model
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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 (...)
User guide: PDF
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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 op-amp gain with feedback (...)
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Reference designs

TIPD113 — Data Acquisition for 10kHz AC, 35mW, 18 bit, 1Msps Reference Design

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 (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD112 — Data Acquisition for MUX and Step Inputs, 18 bits, 1uS Full Scale Response Reference Design

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 (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD115 — Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18 bit, 1Msps Reference Design

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 (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD116 — Data Acquisition Block for ECG Systems, discrete LEAD I ECG implementation Reference Design

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 (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD114 — Data Acquisition at 1KHz AC, 1mW, 18bit, 1Msps Reference Design

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 (...)
User guide: PDF
Schematic: PDF
Package Pins Download
VSON (DRC) 10 View options
VSSOP (DGS) 10 View options

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