E14-440 High-speed external input/output module with USB 2.0 interface

High-speed external input/output module with USB 2.0 interface
  • ADC: 14 bit / 400kHz
  • Input channels: 16 differential or 32 with "common ground"
  • Digital signal processor
  • Digital input/output: 16/16
  • 2 channels DAC (optional)

Universal ADC/DAC module with USB 2.0 interface, especially convenient for creating portable measuring systems based on a laptop. Does not require an additional power source.

E14-440 has software-controlled settings for data acquisition: the number and sequence of input channels asking, measurement ranges, sampling rate of the ADC. Synchronization of data acquisition by external synchro-signal or by the level of the input signal is possible. In addition, there are digital inputs and outputs. It is possible to install a dual-channel DAC.

The use of a digital signal processor and the ability to download application software allow the implementation of various functional algorithms and specialized modes of operation of the module with low-level programming.

Number of channels 16 differential or 32 with "common ground"
Resolution 14 bits
Effective resolution 13,2 bits (400 kHz,  ±2,5 V)
Input impedance (at single-channel mode) Not less than 10 MOhm
Input signal measuring ranges ±10 V;  ±2,5 V;  ±0,625 V;  ±0,156 V
Maximum conversion frequency 400 kHz
  • Internal
  • By external synchro-signal
  • By analog signal level
Inputs protection ± 30 V (power on)
± 10 V (power off)
Inter-channel interference -78 dB (10 kHz sine wave)
Digital signal processor
Type ADSP-2185M
Sampling rate 48 MHz
Internal data RAM 16 Ksamples
Internal program RAM 16 Ksamples
FIFO ADC buffer 512 - 12288 samples
FIFO DAC buffer 512 - 4032 samples
DAC (option)
Number of voltage outputs with common ground 2
Resolution 12 bits
Setting time 8 μs
Output range ±5 V
Output current, no more than 2 mA
Digital inputs and outputs
Number of inputs 16 parallel, asynchronous
Number of outputs 16 parallel, asynchronous with common resolution outputs
Type of logic CMOS (TTL-compatible)
Output current per 1 TTL channel, not more than ±4 mA
Total consumption from all outputs
(TTL, DAC, external power outputs), no more than
0,5 W
Power supply  from the USB bus
Consumption current Up to 400 mA
Dimensions — 129x95x26 mm

Signal connectors

  • E14-440
    E14-440 module, DAC is absent
  • E14-440D
    E14-440 module with dual-channel DAC


  • e14_440_programmers_guide.pdf (filesize: 2 668 237 bytes, date: 20.12.2013)

    E14-440 (USB 1.1) module. Programmer's Guide. Lusbapi Library 3.2. Adobe Acrobat 6.0.

  • e14_440_users_guide.pdf (filesize: 1 626 733 bytes, date: 09.06.2008)

    E14-440 (USB 1.1) module. User’s Guide. Adobe Acrobat 6.0.

Software for Windows

  • lusbapi34.exe (filesize: 2 450 812 bytes, date: 09.02.2012)

    Lusbapi Library v.3.4 for Windows 98/Me/2000/XP/Vista/7. Self-extracting archive with the software for the following L-CARD USB devices:

    • E14-140 module (Rev. "A" and "B")
    • E14-440 module
    • E20-10 module (Rev. "A" and "B")
    • E-154 module

    The archive includes USB driver, library, and examples.

    Attention!!! This version of the library uses a new USB driver. Thus, when upgrading from older versions of Lusbapi to version 3.2 or higher, the end user should switch the USB module to work with the new driver via the "Device Manager".

  • lcomp.exe (filesize: 6 342 216 bytes, date: 12.05.2021)

    Beta version. LCOMP library for Windows XP/Vista/Win7/Win8/Win10 32 and 64-bit versions with drivers. The installer and drivers are digitally signed. The library is built on the basis of modern WDM-drivers rewritten on WDF. It includes the WDM driver itself for L-CARD hardware, the DLL library with source code, programming examples, electronic description, etc. The LCOMP library provides support for almost the entire range of products: PCI boards, USB modules. ISA support is excluded.

    The library includes “L-Graph I” software. L-Graph I supports the following devices: L-1450, L-761, L-780, L-783, L-791, E14-140, E-154 and E14-440. Files recorded by L-Graph I can also be read and processed using the demo-version of PowerGraph v.3.X.

LGraph2 software package

  • lgraph2.zip (filesize: 26 786 707 bytes, date: 11.10.2021)

    LGraph2 is a free multi-channel data recorder for Windows. Version 2.35.20 provides the possibility of simultaneous data visualization and recording from the ADCs: L-502, L-780M, L-783, L-791, E-502, E14-140, E14-140M, E14-440, E-154, E20-10, LTR11, LTR114, LTR27, LTR212, LTR216, LTR22, LTR24, LTR25, LTR51. It requires an updated version of the LComp driver (from version 01.04.2010) and ltrserver (no lower than


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