bullet Universal Frequency-to-Digital Converters UFDC-1 and UFDC-1M-16

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Universal Frequency-to-Digital Converter (UFDC-1) UFDC in TQFP package UFDC in MLF package


1 pce 50 pcs 1000 pcs

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28-lead PDIP 32-lead TQFP 32-pad MLF UFDC-1 14.95 12.95 11.95

Shipping price up to 0.200 KOS:

UFDC-1M-16 17.95 15.95 12.95

EUR 9.00 by international air mail with the tracing code (1-3 weeks delivery time)

EUR 55.00 by UPS courier mail (2-3 days delivery time)


Note: These devices can also be supplied in wafer form. Please contact SWP sales office for detailed ordering information and minimum quantities.

Special prices for distributors. New regional distributors are welcomed.


The Evaluation Board for the UFDC-1 and UFDC-1M-16 is available form <here>



Product Description


The Universal Frequency-to-Digital Converter (UFDC-1) is a universal 2-channel high precision multifunctional converter based on novel frequency-time conversion methods. It is perfectly suited to any applications where frequency-time parameters but also sensors output signal, have to be measured with highest resolution and programmable accuracy during the non-redundant conversion time and self-adaptive possibilities. The UFDC-1 covers all specified converted range of frequencies and accuracy for modern frequency-time domain sensors.


The UFDC-1 is a complex fully digital CMOS integrated circuit (IC). By using this IC it is possible to build a wide variety of digital, smart sensors and intelligent sensor systems. The device achieves a high-resolution conversion for data acquisition systems designed to support all range of frequency-time domain and digital sensor applications. It offers high performance with flexibility and requires a minimum of external components. It  can be easy included into digital environment, controlled by an external microcontroller or work independently as a separate measuring unit without an external control. The function selection can be configured in both software and hardware. The IC converts frequency-time domain signals into digital domain and provides interface to microcontroller, DAQ or sensor system to read these digital results.

The UFDC-1 can measure the following frequency-time parameters of signals:


  • Frequency, fx1 0.05 Hz – 7.5 MHz directly and up to 120 MHz with prescaling

  • Period, Tx1 150 ns – 20 s

  • Phase shift, 0 - 3600 at fxmax = 500 kHz at 50 % duty-cycle

  • Time interval between start – and stop-pulse, tx 2µs – 250 s

  • Duty-cycle, D.C. 0 – 1 at fxmax < 500 kHz for 40-60 % duty-cycle

  • Duty-off factor, Q 10-8 – 8.106 at fxmax < 500 kHz

  • Frequency difference, fx1 – fx2 with sign recognition, 0 – 7.5 MHz

  • Period difference, Tx1 – Tx2 with sign recognition, 0 – 20 s

  • Frequency ratio, fx1/fx2 7 .10-9 – 1.4 . 108

  • Period ratio, Tx1/Tx2 7.5 . 10-9 – 1.33 . 108

  • Rotation speed, nx = (fx . 60)/Z, where Z is the number of modulation rotor gradations

  • Pulse width, tp 2µs – 250 s

  • Space interval, ts 2µs – 250 s

  • Pulse number (events) counting, Nx 0 – 4.109

The UFDC_1 circuit diagram

Figure 1. The UFDC-1 and UFDC-1M-16 Circuit Diagram


The UFDC-1 and UFDC-1M-16 can also work with voltage and current output sensors. It this case, any voltage–to-frequency converter (VFC) can be used. The accuracy of such system will be determined by sensor accuracy as well as by VFC accuracy.





  • 16 measuring modes

  • Provides interfacing for many types of frequency-time domain sensors and transducers

  • Frequency range from 0.05 Hz up to 7.5 MHz (at 40-50 % duty-cycle for fxmax) without prescaling and 120 MHz with prescaling

  • Programmable accuracy (relative error) for frequency (period) conversion from 1 % up to 0.001 % for rectangular waveform input pulse signals

  • Scalable resolution from 2.5 x 10-7 to 45 Hz depend on measuring range

  • Relative quantization error is constant in all specified frequency range

  • Non-redundant conversion time

  • Internal reference clock 500 kHz, 16 MHz @ 16MHz quartz oscillator

  • Quartz-accurate automated calibration

  • Simple 3-wire serial interface (SPI compatible)

  • 2-wire interface (I2C compatible)

  • Two direction RS-232/485 serial interface

  • Master and slave communication modes for RS-232/485

  • Frequency generator mode fosc/2 = 16 MHz / 2 = 8 MHz with quartz crystal stability

  • Single power supply +4.5 ... +5.5 V

  • Current consumption at 16 MHz, 5V, 25 0C below 20 mA

  • Operating temperature range (- 40 0C to + 85 0C)

  • Package Type: 28-lead Plastic Dual Inline Package (PDIP), compact 32-lead TQFP and 32-pad Micro Lead Frame package (MLF)

UFDC-1 packages


Figure 2. UFDC-1 and UFDC-1M-16 Packages



Main Differences Between the UFDC-1 and UFDC-1M-16





Reference frequency, MHz 0.5 16
Frequency range 0.05 Hz ... 7.5 (120) MHz 1 Hz ... 7.5 (120) MHz
Conversion time*, s 0.0002 ... 0.2 0.00000625 ...0.00625


* The conversion time is non-redundant and depends on the programmable relative error.



Custom Design


The custom design is available. The possibility additional functions include but not restricted by:

Most of necessary functions can be implemented on a single circuit and so to provide a system-on-chip solution. Both devices can also be supplied in wafer form. On the base of the UFDC-1 and UFDC-1M-16 we also can develop complete solutions and additional modules to fit your applications. For more information please contact: info@sensorsportal.com


The UFDC-1 and UFDC-1M-16 are also available as IPs for the use in microelectronic design at: Worldwide Component Library and Design & Reuse



Typical Applications:


  • Physical, Chemical and Biosensors and Sensor Sytems

  • Digital sensors design: any frequency, period, duty-cycle, time interval, phase-shift, pulse number output sensors in order to produce a digital output

  • Smart (self-adaptive) sensors due to programmable accuracy and non-redundant conversion time - adaptive possibilities of UFDC-1 automatically choice the conversion time depending on the given error of measurement and opposite

  • Multifunctional and multiparamters sensors for simultaneous detection various parameters proportional to frequency and duty-cycle carrying the information provided by sensing elements.

  • Data acquisition (DAQ) boars and systems for frequency-time parameters

  • Virtual instruments

  • Desktop multifunctional, universal frequency counters

  • Tachometers and tachometric systems

  • Handheld multimeters for frequency-time parameters of electric signals

  • High-end, mid- and low-range ABS

  • High accuracy programmable frequency-time parameters–to–digital converters for different measuring and communication applications

  • Advanced analog-to-digital conversion using a voltage-to-frequency converters for remote sensors

The UFDC-1 applications


Figure 3. The UFDC-1 and UFDC-1M-16 Applications



Documentations and Software:


1. Universal Frequency-to-Digital Converter (UFDC-1). Data Sheet Acrobat Reader logo

2. Universal Frequency-to-Digital Converter (UFDC-1M-16). Data Sheet Acrobat Reader logo

3. Universal Frequency-to-Digital Converter (UFDC-1). Specification and Application Notes Acrobat Reader logo

4. Evaluation Board for Universal Frequency-to-Digital Converters UFDC-1 and UFDC-1M-16 Acrobat Reader logo

5. Catalog of ICs (Product Overwiew and Price List) Acrobat Reader logo

6. Terminal V1.9B for Windows (Software)



Books about how to design sensor and sensor systems based on UFDC-1 IC:


[1]. Yurish S. Y., Digital Sensors and Sensor Systems: Practical Design, IFSA Publishing, 2011.

[2]. Book + Evaluation Board UFDC-1/UFDC-1M-16



Application Specific and Research Papers about UFDC-1 and its Applications:


1. Development of an Electronic Speed Measurement System for Evaluating the Accuracy of GNSS Receivers and Statistical Analysis of Their Performance in Speed Measurements

2. A New Forward-Scatter Visibility Sensor Based on a Universal Frequency-to-Digital Converter

3. Intelligent Opto Sensors’ Interfacing Based on Universal Frequency-to-Digital Converter

4. Data Acquisition Systems for Quasi-Digital Temperature Sensors Based on Universal Frequency-to-Digital Converter

5. Practical Circuits and Interface Techniques for MEMS Accelerometers with Quasi-Digital Output

6. High Precision, Wide Speed Range Rotation Sensing with UFDC-1

7. Digital Humidity Sensors and Data Logger Design Based on Modern Frequency-to-Digital Converter

8. Intelligent Digital Pressure Sensors and Transducers Based on Universal Frequency-to-Digital Converter (UFDC-1)

9. Digital Magnetic Sensors Based on Universal Frequency-to-Digital Converter (UFDC-1)

10.IEEE 1451 Standard and Frequency Output Sensors: How to Obtain a Broad-Based Industry Adoption ?

11.Automated Calibration Technique for Programmable Universal Frequency-to-Digital Converter, in Proceedings of IFAC Workshop on Programmable Devices

   and  Embedded Systems (PDeS’2006), Czeh Republic, Brno, 14-16 February 2006, pp.72-77.

12.High-Speed Universal Frequency-to-Digital Converter for Quasi-Digital Sensors and Transducers,

    Sensors & Transducers Journal, Vol. 80, Issue 6, June 2007, pp. 1225-1229.

13.Self-Adaptive Smart Sensors and Sensor Systems, Sensors & Transducers Journal, Vol. 94, Issue 7, July 2007, pp.1-14

14.Advanced Analog-to-Digital Conversion Using Voltage-to-Frequency Converters for Remote Sensors, Key Engineering Materials: Measurement Technology and Intelligent Instruments VIII,
Vol. 381 – 382, 2008, pp.623-626.

15.Digital Sensors Design Based on Universal Frequency Sensors Interfacing IC, Sensors and Actuators A:, Vol.132, Issue 1, 2006, pp.265-270.

16.Interface Circuit Design for Frequency-Time Domain MEMS Sensors, in  Proc. of International MEMS Conference, 9-12 May 2006, Singapore, Journal of Physics: Conference Series, Vol. 34, 2006

17.Low-Cost, Smart Temperature Sensors Systems Based on Universal Frequency-to-Digital Converter, in Proceedings of the IEEE Sensors Applications Symposium (SAS’ 2009),
    17-19 February 2009, New Orleans, LA, USA, pp.

18.RTD-based Smart Temperature Sensor: Process Development and Circuit Design, in Proceedings of 26th International Conference on Microelectronics,
     MIEL' 2008,
11-14 May 2008, pp.333-336.

19.Improving Accelerometers Performance Using Smart Sensing Techniques, in Proceedings of IEEE SENSORS 2006, Daegu, Korea, October 22-25, 2006,


20.A Self-Adaptable Method to Optimize the Performance of Frequency-To-Code Conversion Based Measurement Systems, in Proceedings of IEEE Conference

    on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS 2005), 5-7 September 2005, pp. 295-298.

21.A Low-Cost Tide Measurement System for Water Quality Assessment, in Proceedings of the IEEE Instrumentation and Measurement Technology Conference

     (IMTC 2006), 24-27 April 2006, pp.2226 - 2230.

22.Design and Experimental Verification of a Smart Sensor to Measure the Energy and Power Consumption in a One-phase AC Line, Measurement,

     Vol. 42, Issue 3, April 2009, pp. 412-419.

24.Using the PIC16F84 Microcontroller in Intelligent Stepper Motor Control, Journal of Electrical and Electronics Engineering, 2008, pp.223-226.

25.Low Cost QCM Sensor System for Screening Semen Samples, Journal of Sensors, Volume 2010, pp.1-5.

26.A Hand-held Electronic Tongue based on Fluorometry for Taste Assessment of Tea, Biosensors and Bioelectronics, Vol. 26, Issue 4, pp.1507-1513.




Press Releases


1. New Excelera's Products Catalog 2016: Focus on Excellence,

    Sensors & Transducers Magazine (e-Digest), Vol. 194, Issue 11, November 2015

2. Evaluation Board Supports Quick and Easy Sensor Systems Developments,

    Sensors & Transducers Magazine (e-Digest), Vol. 104, Issue 5, May 2009.

3. Universal Frequency-to-Digital Converters (UFDC) are Available Now in Miniaturized Micro Lead Frame Package

    Sensors & Transducers Magazine (e-Digest), Vol. 99, Issue 12, December 2008.

4. Sensors Interfacing ICs are Available in Miniature TQFP Package,

    Sensors & Transducers Magazine (e-Digest), Vol. 87, Issue 1, January 2008.

5. Fast, Accurate Universal Frequency-to-Digital Converter for Quasi-Digital Sensors and Transducers,

    Sensors & Transducers Magazine (e-Digest), Vol. 80, Issue 6, June 2007.





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