Specifying Fast Make Oscillators
IQD’s range of fast make oscillators are one time only factory programmable parts. As such they are available at much shorter lead times than standard fixed frequency oscillators.
This can be particularly useful for developing a circuit design when a small volume of oscillators is often needed in a short time to prove a PCB design. Additionally these parts can be a good solution for customers who need uncommon frequencies in small volumes where the development costs of a fixed frequency oscillator can be prohibitive.
A typical surface mount fast make oscillator specification reads like this:
20.0MHz CFPP-72
CMOS ±50ppm –40 to 85C 5.0V
The data in the example above is translated in the following order
- Frequency
- Model
- Output Compatibility
- Frequency Stability (over operating temperature range)
- Operating Temperature Range
- Supply Voltage
Frequency
Frequency is normally specified in kilohertz (kHz) up to 999.999kHz and in megahertz (MHz) from 1.0MHz. All our computer-generated transaction documents follow this standard convention automatically.
The frequency should be described to seven significant figures. If seven significant figures are not used, we assume that any figure that might follow those given may be taken as zero. Thus a frequency given as 16.6MHz will be taken as 16.60, not 16.66667.
Model number
The model number incorporates information which describes holder style, supply voltage and output compatibility.
Frequency Stability
The frequency stability of a surface mount oscillator includes the initial adjustment tolerance at room temperature and the variation over operating temperature range. This value is specified as ‘parts per million’ (ppm) and is available in various ranges as for example: ±20ppm, ±25ppm, ±50ppm & ±100ppm.
Operating Temperature Ranges
0 to 70°C
–10 to 60°C
–20 to 70°C
–30 to 75°C
–40 to 85°C
Although in general oscillators will continue to operate outside their normal temperature range with a degradation in frequency stability, damage can result if the temperatures reached are excessive.
Additional Text Code
If the product is non-standard, the letter ‘T’ and/or ‘E’ will appear at the end of the product specification. This refers to additional text on the quotation/sales order to identify the special requirements.
Packaging Codes
Tape and Reel packaging is available as an option on many of the products outlined in the this chapter.
Unless individual data sheets state Tape and Reel packaging, items will be Bulk packed. Please note: only complete reels are sold.
Bulk = Bulk packed
Reel = Tape and Reel packed
Outline Drawings
Dimensions on the oscillator outline drawings are shown only as a guide. Precise dimensions of oscillator holders are available upon request. All dimensions are shown in mm and are nominal unless otherwise stated.
Delivery Options
Express delivery options are available for some of the fast make range, e.g. a 48 hour fast make service is available. Please contact our sales offices for details.
Marking
Where space is limited some or all of the information will be omitted/truncated at IQD’s discretion. Full product description will be found on the individual batch packaging.
Ordering Information
See individual data sheets