18-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain
Product details
Parameters
Package | Pins | Size
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
- ADS8881C:
- 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
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.
Technical documentation
= Top documentation for this product selected by TI
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
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
- (...)
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
- (...)
REF6025EVM-PDK
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 (...)
Design tools & simulation
SBAM172.ZIP (35 KB) - IBIS Model
SBAM173.TSC (2271 KB) - TINA-TI Reference Design
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
- (...)
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 (...)
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 (...)
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
- (...)
Reference designs
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 (...)
Design files
-
download TIPD115 BOM.pdf (71KB) -
download TIPD115 Gerber.zip (354KB)
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 (...)
Design files
-
download TIPD113 Gerber.zip (1530KB) -
download TIPD113 BOM (Rev. A).pdf (99KB)
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 (...)
Design files
-
download TIPD112 Gerber (Rev. A).zip (1436KB) -
download TIPD112 BOM (Rev. B).pdf (103KB)
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 (...)
Design files
-
download TIPD116 BOM.pdf (78KB) -
download TIPD116 Gerber.zip (1295KB)
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 (...)
Design files
-
download TIPD114 BOM.pdf (59KB) -
download TIPD114 Gerber.zip (1962KB)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VSON (DRC) | 10 | View options |
| VSSOP (DGS) | 10 | View options |
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