USB-AI16-2A Dual Channel 16-Bit 2MS/Second Simultaneous Analog/Digital Input Board

ACCES: Committed to Service

We're here to help!

Let our amazing support staff help you with questions: whether finding the right model for you, or technical support on using the product - or figuring out what's wrong - we have the expertise to help you. Use it!

Call, E-Mail, or Chat, Today!


  • High-speed USB 2.0 device, USB 3.0 compatible
  • Two 1MHz 16-bit A/D converters for 2MHz aggregate sampling rate
  • Analog and digital inputs acquired simultaneously, with timestamping
  • 16 kSample FIFO (shared by all inputs)
  • Per channel software selectable ranges of 0-1V, 0-2V, 0-5V, 0-10V, ±1V, ±2V, ±5V, ±10V
  • Eight digital I/O’s (four inputs & four high-current outputs)
  • High retention USB type B connector for vibration-proof, worry-free communications
  • Alternate USB micro-fit header can be used to reduce board footprint in embedded applications
  • Small rugged steel industrial enclosure


  • OEM version (board only) features PC/104 module size and mounting compatibility
  • Extended temperature (-40° to +85°C)
  • External power
  • Screw terminals for power input provide high retention connection
  • LVTTL DIO lines
  • RoHS compliant product
  • Support for Wind River VxWorks (call for ordering information)
Last updated on November 2, 2023, 6:30 pm


In Stock


Dual Channel 16-Bit 2MS/Second Simultaneous Analog/Digital Input Board

The USB-AI16-2A is a high-speed USB 2.0 device designed for many applications including laboratory and semiconductor fab signal analysis. This product is a USB-based Analog to Digital (A/D) converter board that features two single-ended 16-bit analog inputs with software selectable input ranges, per channel. The board samples each A/D at 1MHz, simultaneously, for an aggregate speed of 2MHz.

Also provided are four general purpose digital inputs and four high-current digital outputs. The inputs and outputs can be configured for 10k ohm pull-up or pull-down resistors (inputs and outputs are separately configurable).

The A/D conversion process is initialized by software control and can be started either by software command or digital input trigger via the right angle I/O header connector. Two status signals are provided at the I/O header; one indicates conversions are enabled; the other indicates the board’s FIFO is almost full. Each sample acquired includes both of the analog input channels and the four digital inputs simultaneously. All data acquired by the board is time stamped with µsecond resolution.

The board is designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The module is PC/104 sized (3.550 by 3.775”) and ships standard inside a steel powder-coated enclosure with an anti-skid bottom.


The OEM (board only) version is perfect for a variety of embedded applications. What makes the OEM option unique is that its PCB size and pre-drilled mounting holes match the PC/104 (3.550 by 3.775 inches) form factor (without the bus connections). This ensures easy installation using standard standoffs inside most enclosures or systems. For embedded OEM applications, a miniature USB input header is provided in parallel with the type B connector.


We provide a variety of cables, terminal boards and mounting provisions such as the MP104-DIN for convenient DIN-Rail mounting.


The USB-AI16-2A utilizes a high-speed custom function driver optimized for maximum continuous data throughput of 4 MB/s that is hundreds to thousands of times faster than the USB human interface device (HID) driver used by some competing products. This approach maximizes the full functionality of the hardware along with capitalizing on the advantage of high-speed USB 2.0. The module is supported for use in most USB supported operating systems and includes a free Linux and Windows compatible software package. This package contains sample programs and source code in C#, Delphi and Visual C++ for 32-bit and 64-bit Windows. Also incorporated is a graphical setup program in Windows. Third party support includes a Windows standard DLL interface usable from the most popular application programs, and includes LabVIEW VIs. Embedded OS support includes the family of Windows Operating Systems including IoT.


Data Sheets



Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.


ACCES has successfully partnered with Wind River to bring our entire line of PCI and PCI Express DAQ cards to VxWorks 7!

VxWorks 7 VxBus Gen 2 drivers, with easy-to-use API-libraries, are available for this product, including full source and sample code.

Designed to be compatible with our AIOWDM.dll Windows driver & API, this kernel module adds zero% CPU-cycle overhead to your VxWorks runtimes while allowing the lowest-latency hardware register access possible.

You can find more information about our VxWorks libraries and services on our Wind River Silver Partner page.

Analog Inputs

  • Number: 2, Single-ended
  • ADC Type: Successive Approximation
  • Sample Rate: 2MHz aggregate across both channels (1MHz each simultaneous)
  • Resolution: 16-Bit
  • Ranges: 0-1V, 0-2V, 0-5V, 0-10V ±1V, ±2V, ±5V, ±10V software ranges per channel
  • Impedance: 1MΩ
  • Data FIFO: 16 kSamples (32 kBytes)

Digital I/O 4 inputs, 4 outputs

Logic Levels 5V

  • Low Inputs = 1.5V = 2µA
  • High Inputs = 3.5V = 2µA
  • Low Outputs = 0.55V 32mA
  • High Outputs = 3.8V 32mA

Logic Levels 3.3V LVTTL Option

  • Low Inputs = 0.8V = 2µA
  • High Inputs = 2.0V = 2µA
  • Low Outputs = 0.55V 24mA
  • High Outputs = 2.4V 24mA


  • Operating Temp: Commercial: 0° to 70° C
  • Industrial: -40° to +85° C
  • Storage Temp: -40° to +85° C
  • Humidity: 5%-95%, non-condensing
  • Board Dimension: 3.550 x 3.775 inches


  • +5VDC ~415 mA typical, no-load (+5VDC from the USB bus.)

USB host controllers provide a max of 500mA in most desktop environments. This gives you 85mA available (500mA – 415mA = 85mA) to divide amongst the digital output buffered lines. Optional AC/DC adapter can be ordered (“-PR” option) if USB can’t supply the full 500 mA.

ModelDescriptionPrice (USD)

USB Dual Channel 16-Bit 2MS/Second Simultaneous Analog/Digital Input Module

Options (call for pricing)
-OEM Board only, without enclosure, features PC/104 module size and mounting compatibility
-PR External power components and AC/DC adapter
-ST Screw terminals installed for DC-power input (no jack, no wall-wart)
-LV Replaces +5VDC digital logic with +3.3V I/O
-T Extended Operating Temperature (-40°C to +85°C)
MP104-DIN USB/104 DIN Rail Mount