[Ecliptek Tech Talk]

Tech Talk

Frequently Asked Questions

Ecliptek E13C7 and E15C7 Series

  1. What are the Ecliptek E13C7 and E15C7 product series?
  2. How does the LVPECL crystal oscillator (XO) work?
  3. What are the typical oscillator customer circuit applications for these product series?
  4. What are the customer products that use these types of LVPECL oscillators?
  5. What benefits do these products offer?
  6. What is the package type for these product series?
  7. What are the construction characteristics for these product series?
  8. What are the input voltage (power supply) specifications for these product series?
  9. What is the input current for these product series?
  10. What output frequencies can I obtain for these product series?
  11. How do I specify the overall frequency stability of these product series?
  12. What are the operating temperature range (OTR) options for these product series?
  13. What are the frequency tolerance/stability options for these product series?
  14. What is oscillator aging and what are the aging specifications for these product series?
  15. Is start-up time specified for these product series?
  16. What are the output and output load characteristics for these product series?
  17. Do these product series offer a tri-state logic control output function?
  18. What is stand-by current?
  19. What is the complementary output option?
  20. How do I layout my printed circuit board for these SMD oscillators?
  21. How do I electrically test these products at my facility?
  22. What are the rms phase jitter and phase jitter characteristics for these product series?
  23. What are the differences between these Ecliptek BAW resonator oscillators and the SAW resonator oscillator products offered by our competitors?
  24. Are these products compatible with my existing assembly process?
  25. How do I layout my printed circuit board for these product series?
  26. Are these oscillator series RoHS compliant and Pb-free?
  27. How can I obtain a RoHS compliant (Pb-free) certification for these product series?
  28. How do I cross these product series with a competitor's part number?
  29. What information is needed to obtain a quote for these product series?
  30. What are the environmental and mechanical specifications for these product series?
  31. What reliability information is available for these product series?
  32. Who do I contact if I have additional technical questions about these product series?
  33. How do I order an oscillator that has custom requirements not specified on the standard oscillator series specification sheets?
  34. Is Thermal Resistance information available for these product series?
  35. Is IBIS model information available for these product series?
  36. How do I obtain a pdf copy of the product series specification data sheet?
  37. How do I obtain a pdf copy of the specification data sheet for a specific part number?
Top of Page
  1. What are the Ecliptek E13C7 and E15C7 product series?
    The Ecliptek E13C7 and E15C7 product series are low voltage positive emitter-coupled logic output (LVPECL) crystal controlled bulk acoustic wave (BAW) oscillators.
  2. Top of Page

  3. How does the LVPECL crystal oscillator (XO) work?
    A LVPECL oscillator is a clocking device where the frequency of the device is primarily controlled by an internal BAW quartz crystal and the signal internal to the oscillator is amplified through a LVPECL output buffer.
  4. Top of Page

  5. What are the typical oscillator customer circuit applications for these product series?
    These oscillators can be used in any of the following applications:
    • Clock Recovery
    • Phase-Locked Loops
    • Digital Network Switching
    • Synthesizer Reference
    • Clock Distribution/Multiplexing
  6. Top of Page

  7. What are the customer products that use these types of LVPECL oscillators?
    LVPECL oscillators are commonly used in the following customer products:
    • 1G, 10G Gigabit Ethernet
    • 1G, 2G, 4G, 10G Fiber Channel
    • Routers/Hubs
    • Digital Switching Networks
    • SONET/ATM/SDH System Equipment
    • High Resolution Video
    • PCI Express
  8. Top of Page

  9. What benefits do these products offer?
    These series of oscillators offer:
    • Improved frequency stability through the use of BAW (bulk acoustic wave) crystal
    • Output frequencies up to 312.5MHz
    • Supply Voltages of 3.3VDC and 2.5VDC
    • Low rms phase jitter
    • Excellent phase noise performance
    • Commercial, extended, and industrial temperature ranges
    • Tri-state function high impedance output
    • Complementary output
    • Industry standard 5mm x 7mm six pad SMD package
    • High speed LVPECL output with fast rise and fall times
    • Tight duty cycle of 50 5%
    • RoHS Compliant (Pb-free) with high temperature 260°C reflow capability
  10. Top of Page

  11. What is the package type for these product series?
    These products are offered in the industry standard six-pad 5mm x 7mm x 2mm leadless ceramic SMD package.
  12. Top of Page

  13. What are the construction characteristics for these product series?
    These product series consist of a single ASIC and a BAW quartz crystal packaged inside a hermetically sealed ceramic leadless SMD package. The leadless SMD package is Pb-free and has six gold plated contact I/O pads. The package has a seam sealed metal cover that is case grounded for improved EMI performance.
  14. Top of Page

  15. What are the input voltage (power supply) specifications for these product series?
    The Ecliptek E13C7 series offers an LVPECL output with a supply voltage of 3.3VDC ±5%. The Ecliptek E15C7 series offers an LVPECL output with a supply voltage of 2.5VDC ±5%.
  16. Top of Page

  17. What is the input current for these product series?
    The input current specification for these product series can be found on the applicable datasheet. These current ratings are for oscillators with the specified output load connected.
  18. Top of Page

  19. What output frequencies can I obtain for these product series?
    These product series feature specific frequencies. The specific frequencies can be found on the applicable datasheet.
  20. Top of Page

  21. How do I specify the overall frequency stability of these product series?
    Ecliptek specifies the frequency stability performance of the device inclusive of all operating conditions. This is often called the Inclusive Method. An alternate method, called the Separate Method, is used to specify device performance under specific operating conditions and to specify separate operating parameters such as calibration tolerance at 25°C, frequency stability over operating temperature range, supply voltage, output load, and first year aging. These series of oscillators use the Inclusive Method for specifying the oscillator frequency stability performance..
    The advantage of the Inclusive Method is that a customer can simply specify one overall frequency stability parameter rather than specifying many individual parameters such as temperature stability over operating temperature range, output load, supply voltage, and aging. See Table 1 below for a comparison of the Inclusive Method and the Separate Method.
    Table 1: Example of Method Comparison
    Output Parameter Inclusive Method Separate Method
    Calibration Tolerance   ±15ppm MAX
    Stability over OTR   ±25ppm MAX
    Stability vs. Supply Voltage   ±3.0ppm MAX
    Stability vs. Output Load   ±2.0ppm MAX
    Aging over 10 years   ±5.0ppm MAX
    TOTAL ±50ppm MAX ±50ppm MAX
  22. Top of Page

  23. What are the operating temperature range (OTR) options for these product series?
    Ecliptek offers a commercial temperature range of 0°C to +70°C and an extended industrial temperature range of -40°C to +85°C.
  24. Top of Page

  25. What are the frequency tolerance/stability options for these product series?
    These oscillator series offer several frequency tolerance/stability options using the Inclusive Method as shown in Table 2 below:
    Table 2: Frequency Tolerance/Stability Options
    Frequency Tolerance/Stability Option Letter Frequency Tolerance/Stability Maximum Operating Temperature Range
    C ±100ppm 0°C to 70°C
    D ±50ppm 0°C to 70°C
    E ±25ppm 0°C to 70°C
    G ±100ppm -40°C to 85°C
    H ±50ppm -40°C to 85°C
    J ±25ppm -40°C to 85°C
  26. Top of Page

  27. What is oscillator aging and what are the aging specifications for these product series?
    Aging is the systematic change in frequency with time due to internal changes in the crystal and/or oscillator. Aging is often expressed as a maximum value in parts per million per year [ppm/year]. The rate of aging is logarithmic in nature. The following factors effect crystal aging: adsorption and desorption of contamination on the surfaces of the quartz, stress relief of the mounting and bonding structures, material outgassing, and seal integrity. At a rated operating temperature of 25°C, these series of products typically age at a rate of less than ±3ppm over the first year, ±1ppm over the following year, logarithmically declining each year there after. The aging parameters can be found on the applicable specification datasheet.
  28. Top of Page

  29. Is start-up time specified for these product series?
    Start-up time for these series is specified at 10mSec maximum. Note: In order to ensure proper start-up, the power supply start-up should have an exponential curve typical of a capacitive charge of a linear voltage ramp. If you have a special voltage start-up profile (i.e. odd ramp steps or shapes), please contact us to discuss possible oscillator performance issues.
  30. Top of Page

  31. What are the output and output load characteristics for these product series?
    Ecliptek offers these product series with a low voltage positive emitter-coupled logic (LVPECL) output. The oscillator output topology utilizes an open collector transistor that allows the end user to adjust their output termination so as to optimize circuit load matching and signal performance. Signal integrity is optimized when the low impedance output of the oscillator is driving a 50-ohm transmission line. Thus, Ecliptek specifies a load termination of 50ohms into VCC minus 2.0VDC (or 1.3VDC with a 3.3VDC power supply or 0.5VDC with a 2.5VDC power supply).
  32. Top of Page

  33. Do these product series offer a tri-state logic control output function?
    These product series offers a tri-state output function to facilitate the customer's use of in-process assembly testing or for the use of multiple clocks.
    For these series, pad one (1) is the tri-state input control pad. The output and complementary output are three-stated (tri-state condition) when the voltage at the control pad is set to a logic low state. In this condition, the oscillator output and complementary output are in a high impedance state. If the voltage at the control pad is set to no connect or a logic high state, the output and complementary output are enabled (clocking). Note: The oscillator has an internal pull up resistor on the control pad. Reference the timing diagram below:
    Figure 1: Enable/Disable Timing Diagram

    Enable/Disable Timing Diagram

  34. Top of Page

  35. What is stand-by current?
    The current consumption of the oscillator (stand-by current) is significantly reduced when the oscillator tri-state function is enabled. When the voltage at the input control pad is set to a logic low state, the oscillator and output buffer circuitry within the LVPECL oscillator are disabled (turned off). The stand-by current for these product series is listed on the applicable datasheet.
  36. Top of Page

  37. What is the complementary output option?
    The term complementary output, often called a differential pair, is when one output signal is the logical opposite (complement) of the other output signal. Thus, when the output pad of the oscillator is in a logic high state, the complementary output pad of the oscillator is in a logic low state.
  38. Top of Page

  39. How do I layout my printed circuit board for these SMD oscillators?
    The customer should layout their PCB to include proper connections for the tri-state input function and the complementary output function. See the recommended solder pad layout provided on the applicable Ecliptek specification sheet.
  40. Top of Page

  41. How do I electrically test these products at my facility?
    It is recommended that the customer use the test fixture specified by Ecliptek. This information is available in the 'Other Resources' section on the applicable series specification datasheet (E13C7, E15C7).
  42. Top of Page

  43. What are the rms phase jitter and phase jitter characteristics for these product series?
    RMS Period Jitter is the measure in the time domain and is specified in picoseconds (pS) as a maximum value. Phase noise is a measure in the frequency domain and is specified in decibels at various offset points from the carrier (-dBc/Hz). Phase jitter, often called offset jitter) is derived from the Phase Noise measurement of the spectral density over a given offset bandwidth. Ecliptek uses a proprietary design, exclusive processing methods, and a unique ASIC output driver circuit enabling these product series to have exceptionally low jitter and Phase noise. The rms phase jitter and phase noise parameters can be found on the E13C7 and E15C7 specification sheets.
  44. Top of Page

  45. What are the differences between these Ecliptek BAW resonator oscillators and the SAW resonator oscillator products offered by our competitors?
    An end user can achieve improved frequency stability (i.e. frequency change as a function of temperature) through the use of a bulk acoustic resonator (BAW) resonator, significantly improving performance over a surface acoustic wave (SAW) oscillator. This is accomplished through the use of an AT cut quartz crystal that is used as the reference to the oscillator. This design solution offers superior performance with a comparable cost of competing SAW-based oscillators.
  46. Top of Page

  47. Are these products compatible with my existing assembly process?
    If the part number is specified with the TR option, these product series are delivered to the customer in EIA481A compliant tape and reel packaging. Without the TR option, these products are delivered to the customer in industry standard plastic tubes. See the applicable specification (E13C7, E15C7) for packaging dimensions and suggested solder reflow diagrams. These product series are capable of withstanding industry standard high temperature (260°C, 10 seconds) convection reflow processes.
  48. Top of Page

  49. How do I layout my printed circuit board for these product series?
    See the applicable specification for suggested solder pad layout (E13C7, E15C7).
  50. Top of Page

  51. Are these oscillator series RoHS compliant and Pb-free?
    These product series are RoHS compliant and Pb-free as defined in the Ecliptek Pb-free Roadmap and are capable of withstanding industry standard high temperature convection reflow processes. See the recommended solder reflow methods listed on the applicable specification data sheet.
  52. Top of Page

  53. How can I obtain a RoHS compliant (Pb-free) certification for these product series?
    A RoHS product certification letter can be obtained directly from our website by using our Ecliptek RoHS Certification Letter Generator .
  54. Top of Page

  55. How do I cross these product series with a competitor's part number?
    Please see the Ecliptek Competitor Part Number Crosser.
  56. Top of Page

  57. What information is needed to obtain a quote for these product series?
    Ordering on-line is simple. Simply fill in the required information in the part number constructor for the specific series that you would like to order. This part number will define the specifications you desire. After you construct a part number, you can request a quote or check stock by following the prompts on our website. You can go to a part number constructor now by selecting a link below:
    Series Package Type Supply Voltage
    E13C7 Ceramic Six Pad 3.3VDC
    E15C7 Ceramic Six Pad 2.5VDC
  58. Top of Page

  59. What are the environmental and mechanical specifications for these product series?
    The environmental and mechanical specifications for each product series are listed on the applicable specification.
  60. Top of Page

  61. What reliability information is available for these product series?
    Failure in Time (FIT) and Mean Time To Failure (MTTF) reliability data is available from the factory. Please contact us us with your request for this data
  62. Top of Page

  63. Who do I contact if I have additional technical questions about these product series?
    The engineering staff at Ecliptek can provide applications engineering support or customer technical questions.
  64. Top of Page

  65. How do I order an oscillator that has custom requirements not specified on the standard oscillator series specification sheets?
    Complete the Ecliptek Custom Oscillator Request Form from our website. From this page you will be able to enter custom specifications that are unavailable from the standard part number constructor forms. These parameters will be sent to our Engineering team where they will be evaluated. Upon acceptance, a custom part number will be assigned and an engineering document created to represent your product.
  66. Top of Page

  67. Is Thermal Resistance information available for these product series?
    θJA and θJC values are available for these product series. Please see the Oscillator Thermal Resistance information provided.
  68. Top of Page

  69. Is IBIS model information available for these product series?
    IBIS modeling information is available for these product series.
  70. Top of Page

  71. How do I obtain a pdf copy of the product series specification data sheet?
    You can go to the specific series you desire now by selecting a link below. At the bottom of the page under Other Resources, select Download Specification.
    Series Package Type Supply Voltage
    E13C7 Ceramic Six Pad 3.3VDC
    E15C7 Ceramic Six Pad 2.5VDC
  72. Top of Page

  73. How do I obtain a pdf copy of the specification data sheet for a specific part number?
    Simply fill in the required information in the part number constructor for the specific series that you would like to order. This part number will define the specifications you desire. After you construct a part number, you will be prompted with the following: Get a data sheet for this part number (PDF).
  74. Top of Page

Top of Page
[ All Content Copyright © 2008 Ecliptek Corporation | Legal Disclaimer | Privacy Policy ]