Introduction to ceramic resonators

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1 Advanced Crystal Technology Advance Crystal Technology Introduction to ceramic resonators Advance Crystal Technology 1 October 2014

2 OVERVIEW What does a timing device do? It generates a stable electrical signal to the chip which it is connected to. A ceramic resonator is generally called resonator. Actual vibration of a resonator is mechanical. But It can be also described as a model of basic electrical circuit of Ro, Lo, Co and Cm. These values can be acquired by measuring a resonator using network analyser. Equivalent Circuit: 2 October 2014

3 CLASSIFICATION OF RESONATOR Ceramic resonators stand between crystal resonators and LC/CR resonators in terms of accuracy. A ceramic resonator offers a low-cost and high-reliability timing device with improved start-up time and built-in capacitors option. 3 October 2014

4 RESONATOR VS CRYSTAL COMPARISON Ceramic resonator Quartz qrystal Electrical characteristics 5000ppm (STD) Freq. Tol.(at 25C) +/-50ppm (typ.) 3000ppm (STD) Freq. Stability (-40/+85C) +/-150ppm (typ.) 0.01 to 0.3 ms Start up time 0.1 to 3.0 ms Piezoceramic Vibration element Crystal Ordinal process room Process Clean room Built-in or External Capacitor External No Freq. adjust in Production Yes 4 October 2014

5 ACT PORTFOLIO OF CERAMIC RESONATOR Ceramic resonator Leaded (DIP) type SMD type (chip type) With built-in capacitor Without built-in capacitor With built-in capacitor Without built-in capacitor Three-pin type Two-pin type Three-pad type Two-pad type Various package sizes and construction options are available. 5 October 2014

6 CERAMIC RESONATOR KEY SPECIFICATION Frequency available frequency range varies from 1.79MHz to 60.00MHz. Package type and size (mm) wide range of surface mount and leaded type packages available with two pin/pad and three pin/pad options. With or without built-in capacitors customers may refer to 2-pin/pad (without built-in capacitors) or 3-pin/pad (with built-in capacitors). Frequency tolerance (ppm) at 25 C maximum frequency deviation from nominal frequency at room temperature. Available frequency tolerance range varies from ±0.25% to ±0.5%. Frequency stability (ppm) maximum frequency deviation over temperature range. Available frequency stability range varies from ±0.25% to ±0.5%. Operating temperature range -25 C to 85 C (many other options available). Aging (%) ±0.3ppm for 10 years. Tape and reel available in reel and bulk quantities. 6 October 2014

7 CERAMIC RESONATOR PART NUMBERING (EXAMPLE) ZTA = 2-pad/pins and without built-in capacitors ZTT = 3-pad/pins and with built-in capacitors Part number: ZTACS8.00MNFL-PF 7 October 2014

8 IC CHARACTERISATION FOR CERAMIC RESONATOR For circuit safety critical application, IC matching is recommended on customer application PCB to ensure that the resonator is oscillating at the correct frequency and the oscillation circuit has enough oscillation margin for stable oscillation. The worst case and typical resonator samples are tested with microcontrollers from the customer s PCB to adjust frequency error and oscillation margin. The following test items are measured. The decision as to whether any resonator tuning is required is based on this test data. Oscillation frequency Oscillation amplitude Oscillator start and stop voltage Start-up time Load capacitance and damping resistance dependency Supply voltage and temperature dependency Oscillator frequency correlation (between test PCB and ACT standard) Negative resistance 8 October 2014

9 CERAMIC RESONATOR APPLICATION Ceramic resonators are used for a reference timing source in most microcontrollerbased applications. Typical applications are: Home appliances (CD/MD, HDD-video, audio, washing machine, air conditioner) Storage equipment (HDD, CD-R/W, DVD, memory card) Amusement (mouse, games) Automotive electronics (ECU, ABS, display unit) The list above includes just some examples. Ceramic resonators are used for a wide range of general electronic and IT applications. 9 October 2014

10 CONTACT DETAILS Contacts Tejas Parmar QA and Engineering Manager Advanced Crystal Technology +44 (0) Gerry McAuley General Manager Advanced Crystal Technology +44 (0) Address Acal BFi UK Ltd. 3 The Business Center Molly Millars Lane Wokingham, Berkshire RG41 2EY UK (55km west of London) 10 October 2014

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