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High-Speed, High-Density 16-bit Analog Inputs


usb analog input board - acces io
  • High-speed USB 2.0 device, sampling rate to 500kHz
  • All functions fully software configurable
  • 16-bit resolution A/D converter
  • 64 single-ended or 32 differential inputs
  • Eight input ranges, unipolar or bipolar
  • Real-time hardware autocalibration and oversampling for accurate data
  • Unique channel-by-channel programmable gains
  • Data buffer for A/D
  • Synchronous, asynchronous, timed trigger modes
  • 4 high-current digital Output lines
  • 8 digital Input lines
  • 16-bit programmable counter/timer
  • Alternate embedded USB connector
  • Two 50-pin right-angle I/O headers
  • USB/104 form-factor for embedded OEM’s
  • Small (4" x 4" x 1.25") rugged industrial enclosure
  • All required power drawn from USB port


  • External power for high current capabilities
  • DIN rail mounting provision
  • OEM (board only) version with mounting holes for added flexibility in embedded applications
  • Extended Temperature Operation -40 to 85°C

The USB-AI16-64MA is an ideal solution for adding portable, easy-to-install high-speed analog and digital I/O capabilities to any computer with a USB port. The unit is a USB 2.0 high-speed device, offering the highest speed currently available with the USB bus. The USB-AI16-64MA is a 16-bit resolution A/D board capable of speeds up to 500kHz for its 64 single-ended or 32 differential analog inputs. Each channel can be independently software configured to accept 8 different input ranges. A unique, real-time internal calibration system allows the card to continually compensate for offset/gain errors giving a more accurate reading. The unit is plug-and-play allowing a quick connection whenever you need additional I/O on the convenience of a USB port.

This small, compact, multifunction I/O board provides the user with everything needed to start acquiring, measuring, analyzing and monitoring in a variety of applications. The USB-AI16-64MA data acquisition board set can be used in many real-world applications such as embedded equipment monitoring, precision PC-based and portable environmental measurements, and mobile data acquisition. Additional features include 4 high-current digital output lines, 8 digital inputs, and a programmable 16-bit counter. The counter can be configured in a variety of modes and has the ability to use external signals to trigger and control the scanning of its inputs.

The USB-AI16-64MA is designed to be used in rugged industrial environments but is small enough to fit nicely onto any desk or testing station. The board is PC/104 sized (3.550 by 3.775 inches) and ships 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 mounting holes match the PC/104 form factor (without the bus connections). This allows our rugged analog input board to be added to any PCI-104 or PC/104 stack by connecting it to a USB port usually included on-board with embedded CPU form factors such as EBX, EPIC, and PC/104. This is especially important since many newer CPU chipsets do not support ISA and have plenty of USB ports. The USB-AI16-64MA OEM board can also be installed using standoffs inside other enclosures or systems.


The USB-AI16-64MA is available with optional cable assemblies and screw terminal boards for easy-to-use, out of the box connectivity.


The module utilizes a high-speed custom function driver optimized for a maximum data throughput of 1MBps that is 50-100 times faster than the USB human interface device (HID) driver used by many competing products. This approach maximizes the full functionality of the hardware along with capitalizing the advantage of high-speed USB 2.0. The USB-AI16-64MA is supported for use in most USB supported operating systems and includes a free Linux (including Mac OS X) and Windows 98se/Me/2000/XP/2003 compatible software package. This package contains sample programs and source code in Visual Basic, Delphi and Visual C for 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 example LabVIEW VIs. Embedded OS support include Windows XPe.

USB AI Block Diagram

Analog Inputs

  • ADC Type Successive approximation
  • Sampling rate
  • USB-AI16-64MA 500ksamples/sec (maximum aggregate)
  • USB-AI16-64ME 250ksamples/sec (maximum aggregate)
  • Resolution 16-bit
  • Number of channels 64 single-ended or 32 differential (software selectable)
  • Bipolar ranges ±1V, ±2V, ±5V, ±10V (software selectable)
  • Unipolar ranges 0-1V, 0-2V, 0-5V, 0-10V (software selectable)
  • Board Calibration VREF LOW: AGND VREF HIGH: 9.90V ± 0.0299V
  • System Calibration Program provided to calibrate entire system
  • Calibration Hardware
    • USB-AI16-64MA: Calibrated real-time output for offset/gain errors
    • USB-AI16-64ME: NONE
  • Input impedance:1M
  • A/D Start Sources: Software Start, Timer Start, and External Start Trigger, (rising or falling edge; software selectable)
  • A/D Start Enable: Externally supplied (pulled-up; active-high )
  • A/D Start Types: Single Channel or Scan (software selectable)
  • Chl Oversample: 0-255 consecutive samples/channel
  • Over volt protection: -40 to 55V
  • Crosstalk
    • No crosstalk present below 400KHz
    • -60dB @ 500KHz

Digital I/O

  • Lines 8 inputs (pulled up) and 4 outputs
  • Input voltage
    • Logic low: 0V(min) to 0.8V(max)
    • Logic high: 2V(min) to 5V(max)
  • Input current ±20µA (max)
  • Output voltage
    • Logic low: 0V(min) to 0.55V(max)
    • Logic high: 2V(min) to 5V(max)
  • Output current
    • Logic low: 64mA(max) sink
    • Logic high: 32mA(max) source


  • Available Counters: Counter 0
  • Type: 82C54 programmable interval counter
  • Input Frequency: 10MHz (max)
  • Counter size: 16-bit
  • Clock: Internal 10MHz or Externally supplied, (software selectable; pulled-up)
  • Clock Period: 100ns (min)
  • Clock Pulse Width High: 30ns (min)
  • Clock Pulse Width Low: 40ns (min)
  • Gate: Externally supplied (pulled-up; active-high)
  • Output: External (pulled-up)
  • Voltage/Current: Same as Digital I/O


  • Operating Temperature: 0° to 70°C, optional -40° to 85°C
  • Storage Temperature: -40° to 105°C
  • Humidity: 5% to 90% RH, without condensation
  • Board Dimensions: PC/104 format, 3.550" by 3.775" and mounting holes
  • Power required: 5V at 330mA typical
ModelPrice (USD)
USB-AI16-64A 839.00
USB-AI16-64E 679.00
UTBK-50 49.00
STB-50 44.00
CAB50F-6 30.00
MP104-DIN 19.00
USB-AI16-64MA Advanced version, 16-Bit, 500kHz, with autocalibration
USB-AI16-64ME Economy version, 16-Bit, 250kHz, with software calibration
MP104-DIN DIN rail mounting provision
-P External power regulator/jack and AC/DC adapter
-OEM Board only (no enclosure)
-DIN DIN rail mounting provision
-T Extended Temperature Operation (-40° to 85°C)
-S0x "x" = special number designator, contact factory
DIO lines configured with pull-down resistors

Available Reference Manuals

Further information about available ACCES Software:

Drivers And Operating Systems
What drivers and other support we provide for various operating systems.

Setup Programs, Samples, And Utility Software
A description of the software package that comes with each ACCES card.

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.

Custom Software Services
A description of some of our custom software offerings. Did you know we offer free programming services to qualifying customers?


USA Office

Address: 1480 Gulf Road, Suite 837,
PO Box 1364
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027