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What are the Ecliptek EMDS series of oscillators?
The EMDS series of oscillators are devices where the output frequency is primarily
controlled by an internal MEMS (micro-electro-mechanical system) resonator and an integrated
programmable LVDS oscillator circuit. Utilizing a proprietary MEMS resonator design and an
exclusive programming method, the EMDS series of oscillators are programmed to a specified
frequency prior to shipment to the customer.
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What are the typical oscillator customer circuit applications for Ecliptek EMDS series oscillators?
This oscillator series can be used in any of the following applications:
- Clock Recovery
- Phase-Locked Loop and Frequency Synthesis
- Digital Switching Networks
- Synthesizer or System Reference
- Clock Distribution
- Clock Translation and Multiplexing
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What are the typical applications and products for this series of Ecliptek EMDS oscillators?
Here is a list of the most common applications and products:
- PCI Express
- Gigabit Ethernet
- Fiber Channel
- SATA/SAS
- FBDIMM
- DDR
- Routers, Servers, Hubs
- Network Switches
- SONET/ATM/SDH System Equipment
- High Resolution Video
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What commercial benefits does this product series offer?
The EMDS series of oscillators have very short lead times with cost effective pricing. This series is an Ecliptek
Quick Turn oscillator product.
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What technical benefits does this product series offer?
This series of MEMS oscillators offer:
- Improved frequency stability through the use of a MEMS resonator
- Output frequencies up to 220MHz
- Supply voltages of 2.5VDC or 3.3VDC
- ±20ppm, ±25ppm, ±50ppm, or ±100ppm maximum frequency stability options
- Commercial, extended commercial, and industrial temperature ranges
- Tight duty cycle of 50% ±5%
- 30,000 G Shock Resistance
- Superior period jitter performance
- Output Enable (Tri-state-High Impedance) or Standby (Tri-state, High Impedance) output options
- Industry standard 5mm x 7mm six pad SMD package
- High speed LVDS output with fast rise and fall times
- Low profile plastic MSL1 rated SMD packages
- RoHS Compliant (Pb-free) with high temperature 260°C reflow capability
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What output frequencies can I obtain for this product series?
The EMDS series features frequencies ranging from 1.000MHz to 220.000MHz. Any frequency in this range can be ordered,
with up to six significant digits (i.e. 100.123456MHz).
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What are the package dimensions for this product series?
This series of oscillators is offered in an industry standard plastic six pad 5mm x 7mm SMD package.
The package dimensions for each product series can be found on the EMDS12 and
EMDS13 datasheet.
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What are the input voltage (power supply) options for this product series?
This series offers operation at 2.5VDC ±5% (EMDS12) and 3.3VDC ±10% (EMDS13).
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What is the input current for this product series?
The input current specification is listed in milliamps as a maximum value on the respective datasheet.
These current ratings are for oscillators with the output load termination current excluded.
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What frequency stability and operating temperature range options can I obtain for this product series?
Ecliptek offers ±20ppm, ±25ppm, ±50ppm or ±100ppm frequency stability options for this product series.
These four frequency stability options apply to a 0°C to +70°C commercial temperature range,
a -20°C to +70°C extended commercial temperature range, or a -40°C to +85°C industrial operating temperature range.
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What are the differences between the tri-state and standby options?
This 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. The EMDS series oscillator contains programmable stand-by and output enable
options for power management.
If the stand-by function is selected, then all active circuitry within the oscillator is shut down when the voltage at
the control pad (pad 1) is set to a logic low state. In this condition, the output signal is three-stated (tri-state). The
oscillator output gate becomes high impedance and the oscillator input current on the power supply line is negligible. The
maximum stand-by current is listed on the applicable Ecliptek datasheet.
If the output enable function is selected, the output circuitry within the oscillator is shut down when the voltage
at the control pad (pad 1) is set to a logic low state. In this condition, the output signal is three-stated (tri-state).
The oscillator output gate becomes high impedance and the oscillator input current on the power supply line is only slightly
decreased from normal operating current. The maximum output enable current is specified on the applicable Ecliptek datasheet.
Figure 1: Enable/Disable Timing Diagram
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What is the function of the complementary output (pad 5)?
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.
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Can I obtain a non-tri-state EMDS series oscillator?
Because Ecliptek uses a proprietary programming interface, this series of product does not offer a 'no connect'
option for pad 1 (or pad 2). Only the stand-by and output enable options are available. However, the customer can
use the EMDS series oscillator as a non-tri-state oscillator by setting the voltage on pad 1 to either no connect
or logic high. The oscillator has an internal pull up resistor on pad 1.
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How do I specify the overall frequency stability of an Ecliptek EMDS series oscillator?
Ecliptek defines the frequency stability performance of the device inclusive of specific oscillator operating conditions.
This is often called the "Inclusive Method". Ecliptek specifies the following parameters for this series of product:
- Calibration Frequency Tolerance at 25°C
- Frequency Stability over Operating Temperature Range
- Supply Voltage
- Output Load
- First Year Aging at 25°C
- 260°C Reflow
- Shock
- Vibration
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What is oscillator aging and what are the aging specifications for this oscillator series?
Aging is the systematic change in frequency over time due to internal changes in the MEMS resonator and/or oscillator.
Aging is often expressed as a maximum value in parts per million per year [ppm/year]. The following factors effect
oscillator aging: adsorption and desorption of contamination on the surfaces of the MEMS resonator, stress relief of the
mounting and bonding structures, material outgassing, and seal integrity. At a rated operating temperature of 25°C,
this series of products typically age at a rate of less than ±1ppm over the first year.
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What are the period jitter characteristics for this product series?
Jitter is a time domain measurement and is typically specified in picoseconds (pSec). Ecliptek uses a proprietary
oscillator design, exclusive processing methods, and a unique output driver circuit enabling this oscillator series to
have exceptionally low period jitter. The various period jitter parameters for this series can be found on the
EMDS12 and EMDS13 datasheets.
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Are the period jitter characteristics of this series different than standard fixed frequency quartz crystal oscillator products?
In certain cases, jitter may be higher than the Ecliptek standard fixed frequency quartz crystal oscillator products.
It is recommended that customers review the applicable specifications from our web site
(EMDS12 and EMDS13) and compare the jitter specification at the specific frequency of operation and input voltage condition.
In conjunction with using a proprietary oscillator design and exclusive programming methods, Ecliptek has implemented
controlled rise and fall times, unique output driver circuitry, and innovative circuit layout techniques enabling the
EMDS oscillator to have low period jitter.
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What are the rms phase jitter and phase noise characteristics for this product series?
RMS Period Jitter is a time domain measurement 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 this product series to have exceptionally low jitter and phase noise. The rms phase jitter and phase
noise parameters can be found on the EMDS12 and EMDS13 datasheets.
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Is tight duty cycle (symmetry) available for this product series?
Tight duty cycle (45% minimum, 55% maximum) is standard for this product series and is measured at the
threshold voltage specified on the datasheet.
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What are the output and output load characteristics for this product series?
Ecliptek offers this product series with a low voltage differential signal (LVDS) output. The oscillator output topology
utilizes a constant current source that allows the end user to configure their output termination so as to optimize circuit
load matching and signal performance. Signal integrity is optimized when the low impedance outputs of the oscillator are
driving a 50 ohm transmission line. Thus, Ecliptek specifies a load termination of 100 ohms between the output and
complementary output pads. If a customer requires a different load from that specified on the datasheet, please
contact Ecliptek with your custom requirement.
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Is start-up time specified for this product series?
Start-up time for this series can be found on the applicable datasheet and is defined as the time from when the
power supply reaches its specified value to the time the oscillator output signal amplitude reaches its minimum voltage
output logic high threshold (VOH) and the output is within the specified frequency tolerance. For the EMDS series,
characterization test data indicates that the start-up time is typically around 3 to 5mS.
Note: In order to ensure proper start-up, the power supply start-up should have an exponential curve typical of a
capacitive charge or a linear voltage ramp and not exceed 300mS. If you have a special voltage start-up profile
(i.e. odd ramp steps or shapes), please contact Ecliptek to discuss possible oscillator performance issues.
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What are the differences between this Ecliptek product series and other PLL (Phase Locked Loop) based products offered in the marketplace?
In conjunction with using exclusive MEMS processing methods and proprietary design techniques, Ecliptek
has implemented custom LVDS output driver circuitry and innovative circuit layout techniques enabling this
oscillator series to have exceptionally low jitter and phase noise using an internal PLL. It is recommended that
the customer obtain the applicable electrical specifications from the Ecliptek web site and compare the electrical
parameter(s) of interest.
Although mechanically similar to this product series, there are often major electrical differences between a
PLL based oscillator and a non-PLL based oscillator. The most significant of these differences is rms phase jitter
and phase noise performance. A device using a PLL based (i.e. frequency multiplication) oscillator often has inferior
rms phase jitter and phase noise performance as compared with one that uses a non-PLL based oscillator
(i.e. fundamental mode or third overtone mode crystal oscillators).
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Should I add both the EMDS series oscillator and the standard fixed frequency Ecliptek product to my AVL (Approved Vendors Listing)?
Yes! You should add both the EMDS series oscillator and the standard fixed frequency Ecliptek product to your
AVL in order to obtain greater cost economies and schedule flexibility. Below is a matrix listing EMDS products
and standard fixed frequency products.
| Package Dimensions |
Supply Voltage |
EMDS Series |
Crystal Oscillator Series |
| 5mm x 7mm |
2.5 V |
EMDS12 |
EL15C7 |
| 5mm x 7mm |
3.3 V |
EMDS13 |
EL13C7 |
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How do I electrically test this product series at my facility?
It is recommended that the customer use the test fixture specified on the Ecliptek datasheet
(EMDS12 and
EMDS13).
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Is this oscillator series compatible with my existing assembly processes and equipment?
If the part number is specified with the TR option (tape and reel packaging), oscillator products are
delivered to the customer in EIA481A compliant tape and reel packaging. Without the TR option, products are
delivered to the customer in bulk packaging (ESD protective bag). See the "Other Resources" section of the EMDS12 and EMDS13 datasheets for the
tape and reel packaging dimensions and suggested solder reflow diagrams. This product series is capable of withstanding industry standard high temperature (260°C, 10
seconds) convection reflow processes and are rated MSL1 per J-STD-020.
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Is this oscillator series RoHS compliant and Pb-free?
This product series is RoHS compliant and Pb-free as defined in the Ecliptek Pb-free Roadmap and is capable of
withstanding industry standard high temperature convection reflow processes. See the recommended solder reflow methods
listed in the "Other Resources" section of the EMDS12 and EMDS13 datasheets.
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How can I obtain a RoHS compliant (Pb-free) certification for this product series?
A RoHS product certification letter can be obtained directly from our website by using our
Ecliptek RoHS Certification Generator.
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Is RoHS and RoHS (Pb-free) material declaration data available for customer review?
Ecliptek can provide material declaration data in compliance with IPC-1752 to assist customers with
their RoHS Compliance (Pb-free) concerns.
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How do I layout my printed circuit board for this product series?
The customer should layout their PCB to include proper connections for the tri-state input function
(pad 1), the center paddle (pad A), and the complementary output (pad 5). See the EMDS12 and EMDS13
datasheets for the recommended solder pad dimensions.
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What is the function of 'pad A' on the bottom center of the part?
The pad (often called a paddle), is labeled 'A' and is defined as 'Ground'. This pad is internally connected to
the oscillator circuit ground (pad 3). Its main function is for thermal heat dissipation.
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Should I include a land pattern on my PCB layout for the paddle (A)?
It is recommended, but not required, that the customer include a land pattern on the PCB for the paddle (pad A).
The addition of the land pattern will improve the dissipation of thermal heat from the bottom of the oscillator.
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What will happen if 'pad A' is connected to Ground or VDD?
Connecting the paddle (pad A) to VDD is not recommended and may affect operation of the device.
Ecliptek engineering recommends connecting the paddle (pad A) to ground. If this is not possible, an acceptable
alternate configuration is leaving it as a no connect.
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How do I cross this product series with a competitor part number?
Please see the Ecliptek Competitor Part Number Crosser.
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What information is needed to obtain a quote for this product series?
Obtaining a quote 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:
| Supply Voltage (VDC) |
Ecliptek Series
(All packages are 5x7mm) |
| 2.5 |
EMDS12 |
| 3.3 |
EMDS13 |
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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 or click on the Adobe PDF icon in the top right hand corner of the page.
| Supply Voltage (VDC) |
Ecliptek Series
(All packages are 5x7mm) |
| 2.5 |
EMDS12 |
| 3.3 |
EMDS13 |
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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).
You can jump to a part number constructor using the table below:
| Supply Voltage (VDC) |
Ecliptek Series
(All packages are 5x7mm) |
| 2.5 |
EMDS12 |
| 3.3 |
EMDS13 |
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Who do I contact if I have additional technical questions about the use of this product series?
The Engineering Staff at Ecliptek can provide applications engineering support or answer customer technical questions.
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How do I order an oscillator that has custom requirements not specified on the standard oscillator series specification sheet?
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.
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What are the environmental and mechanical specifications for this product series?
The environmental and mechanical specifications for each product series are listed on the EMDS12 and EMDS13 datasheet.
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What reliability information is available for this product series?
Failure in Time (FIT) and Mean Time to Failure (MTTF) reliability data is available on the Ecliptek website.
You can find the data on our Qualification and Reliability page in the Technical Resources section of our website.
You can also find qualification and reliability data under the "Other Resources" section on the EMDS12 and EMDS13 datasheet.
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Is thermal resistance information available for this product series?
θJA and θJC values are available for this product series. Please see the Oscillator Thermal Resistance FAQ for complete details.
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Are IBIS models available for this product series?
At this time, there is no IBIS modeling available for this product series.
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What is the marking scheme for this product series?
As shown on the applicable datasheet, this series of product has marking content on the top of the part.
This marking consists of a pad one (1) locator dot and a four digit alpha numeric. These digits represent an
Ecliptek manufacturing designator. This designator is used internally at Ecliptek for manufacturing lot traceability.
This manufacturing designator provides no indication of part number or date code or output frequency.
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Where can I get the information regarding discontinued or End of Life products?
Any Ecliptek part number currently under an End of Life statement will be identified as EOL on Ecliptek's
Quotation, along with a link to the EOL statement. This information can also be found on the End of Life Statements
for Discontinued and Obsolete Products section of our website.
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Is Ecliptek ISO 9000 Certified?
Yes, Ecliptek is certified to ISO 9001.
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