Home Data converters Analog-to-digital converters (ADCs) Precision ADCs
Home
Data converters
Analog-to-digital converters (ADCs)
Precision ADCs

ADS8881

ACTIVE

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

Order now
Data sheet

ADS8881

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 18 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type SPI Architecture SAR Input type Differential Rating Catalog Reference mode External Input voltage range (max) (V) 5 Input voltage range (min) (V) 0 Features Daisy-Chainable, Oscillator, Small Size Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 5.5 Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 3.6 SNR (dB) 100 Digital supply (min) (V) 1.65 Digital supply (max) (V) 3.6
Resolution (Bits) 18 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type SPI Architecture SAR Input type Differential Rating Catalog Reference mode External Input voltage range (max) (V) 5 Input voltage range (min) (V) 0 Features Daisy-Chainable, Oscillator, Small Size Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 5.5 Analog supply (min) (V) 2.7 Analog supply voltage (max) (V) 3.6 SNR (dB) 100 Digital supply (min) (V) 1.65 Digital supply (max) (V) 3.6
VSON (DRC) 10 9 mm² 3 x 3 VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • 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.

open-in-new Find other Precision ADCs
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
ADS8900B ACTIVE 20-bit, 1-MSPS, one-channel SAR ADC with internal VREF buffer, internal LDO and enhanced SPI Higher resolution (20-bit)

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 10
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
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
Download
Simulation model

ADS8881 PSpice Model

SBAM462.ZIP (203 KB) - PSpice Model
Download
Simulation model

ADS8881 TINA-TI Reference Design

SBAM173.TSC (2271 KB) - TINA-TI Reference Design
Download
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 (...)
Download
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 (...)
Request
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
View options
Reference designs

TIPD115 — Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design

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

TIPD113 — Data acquisition, 10-kHz AC, 35-mW 18-bit 1-MSPS reference design

This 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 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

TIPD116 — Data acquisition for ECG systems, discrete LEAD I ECG implementation reference design

This 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 1-KHz AC, 1-mW 18-bit 1-MSPS reference design

This 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 and (...)
User guide: PDF
Schematic: PDF
Package Pins Download
VSON (DRC) 10 View options
VSSOP (DGS) 10 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos