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High Speed Multifunction 16-bit Analog Input
  • Details
  • Specification
  • Order information
  • High-speed USB 2.0 device, sampling rate to 500kHz
  • All functions fully software configurable
  • All required power drawn from USB port
  • Extended operating temperature: -40°C to +85°C

The USB-AI16-16A 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-AI16-16A is a 16-bit resolution A/D board capable of speeds up to 500kHz for its 16 single-ended or 8 differential analog inputs. Each channel can be independently software configured to accept 8 different input ranges. Additionally, each channel includes its own analog ground pin on the I/O connector which is helpful in reducing noise. 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-AI16-16A data acquisition board can be used in many current real-world applications such as embedded equipment monitoring, precision PC-based and portable environmental measurements, and mobile data acquisition. Additional features include 16 digital I/O lines 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-AI16-16A 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.

Factory options:

  • External power for high current capabilities
  • DIN rail mounting provision
  • OEM (board only) version with PC/104 mounting holes and PCB footprint for added flexibility in embedded applications
  • Current ranges (4-20mA, 10-50mA) S.E. or Diff
  • Extended Temperature Operation −40 to +85°C

OEM USB/104 form factor

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 digital board to be added to any PCI-104 or PC/104 stack by connecting it to a simple 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-AI16-16A OEM board can also be installed using standoffs inside other enclosures or systems.


The USB-AI16-16A is available with optional cable assemblies and screw terminal boards for easy-to-use, out of the box connectivity.


The USB-AI16-16A is plug-and-play which allows quick connect or disconnect whenever you need additional I/O on your USB port. The module utilizes a highspeed custom function driver optimized for a maximum data throughput 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-AI16-16A is supported for use in most USB supported operating systems and includes a free Linux and Windows 98se/Me/2000/XP/2003 compatible software package. This package contains sample programs and source code in Visual Basic, Delphi, C++ Builder, 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. Embedded OS support include Windows XPe.

Technical specifications

Analog Inputs

ADC Type Successive approximation
Sampling rate USB-AI16-16A 500Ksamples/sec (maximum aggregate)
USB-AI16-16E 250Ksamples/sec (maximum aggregate)
Resolution 16-bit
Number of channels 16 single-ended or 8 differential (software selectable)
Bipolar ranges ±1V, ±2V, ±5V, ±10V (software selectable)
Unipolar ranges 0-1V, 0-2V, 0-5V, 0-10V (software selectable)
4-20mA or 10-50mA Factory installed (optional)
Board Calibration VREF LOW: AGND
VREF HIGH: 9.90V ± 0.0299V
System Calibration Program provided to calibrate entire system
Calibration Hardware USB-AI16-16A Calibrated real-time output for offset/gain errors
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)
Channel Oversamp 0-255 consecutive samples/channel
Over volt protection -40 to +55V
Crosstalk No crosstalk present below 400KHz -60dB @ 500KHz

Digital I/O

Lines 16 inputs or outputs in groups of 8 (pulled-up)
Input voltage Logic low: 0V(min) to 0.8V(max)
Logic high: 2V(min) to 5V(max)
Input current ±20:A (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
Power required +5V at 330mA typical
Board Dimensions PC/104 format, 3.550” by 3.775” and mounting holes

Environmental and physical specifications

Operating Temperature 0°C to +70°C (standard)
-40°C to +85°C (optional)
Storage Temperature -40°C to +105°C
Humidity 5% to 90% RH, non-condensing
Model Description
USB‑AI16‑16A Advanced version, 16-Bit, 500kHz, with auto calibration
USB-AI16-16E Standard version, 16-Bit, 250kHz, with software calibration
STB-68 Screw terminal board
C68PS18L 68-Pin SCSI 18" shielded cable
MP104-DIN DIN rail mounting provision
CUSB-OTG-6 6' USB Cable with Type A to mini type OTG connector for embedded applications

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