Tech Talk

The Ecliptek E13C7 and E15C7 product series are low voltage positive emitter-coupled logic output (LVPECL) crystal controlled bulk acoustic wave (BAW) oscillators.

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.

These oscillators can be used in any of the following applications:

• Clock Recovery
• Phase-Locked Loops
• Digital Network Switching
• Synthesizer Reference
• Clock Distribution/Multiplexing

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

These series of oscillators offer:

• Improved frequency stability through the use of BAW (bulk acoustic wave) crystal
• Output frequencies up to 175MHz
• Supply Voltages of 3.3V_DC and 2.5V_DC
• 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

These products are offered in the industry standard six-pad 5mm x 7mm x 2mm leadless ceramic SMD package.

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.

The Ecliptek E13C7 series offers an LVPECL output with a supply voltage of 3.3V_DC ±5%. The Ecliptek E15C7 series offers an LVPECL output with a supply voltage of 2.5V_DC ±5%.

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.

These product series feature specific frequencies. The specific frequencies can be found on the applicable datasheet.

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

Ecliptek offers a commercial temperature range of 0°C to +70°C and an extended industrial temperature range of -40°C to +85°C.

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

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.

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.

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 V_CC minus 2.0V_DC (or 1.3V_DC with a 3.3V_DC power supply or 0.5V_DC with a 2.5V_DC power supply).

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

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.

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.

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.

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).

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.

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.

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.

See the applicable specification for suggested solder pad layout (E13C7, E15C7).

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.

A RoHS product certification letter can be obtained directly from our website by using our Ecliptek RoHS Certification Letter Generator .

Please see the Ecliptek Competitor Part Number Crosser.

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

The environmental and mechanical specifications for each product series are listed on the applicable specification.

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

The engineering staff at Ecliptek can provide applications engineering support or customer technical questions.

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.

θ_JA and θ_JC values are available for these product series. Please see the Oscillator Thermal Resistance information provided.

IBIS modeling information is available for these product series.

• E13C7 IBIS Model
• E15C7 IBIS Model

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

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).