Specifying Clock Oscillators
A typical surface mount Clock Oscillator specification reads like this:
The following notes define each element of the specification:
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 Clock Oscillator frequency should be specified 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 16.6666.
Please contact the sales office for details of developed frequencies.
Model Number
The model number incorporates information which describes output compatibility and holder style.
Frequency Stability
The frequency stability of a surface mount oscillator includes the initial adjustment tolerance at room temperature, the tolerance over operating temperature range and the effect of supply voltage variation. This value is specified as ‘parts per million’ (ppm) and is available in five ranges as shown below.
The following codes apply:
G = ±20ppm
A = ±25ppm
H = ±30ppm
B = ±50ppm
C = ±100ppm
Operating Temperature Range
0 to 70°C
–10 to 70°C
–40 to 85°C
–55 to 125°C
Although in general Clock 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.
Packaging Code
Tape and Reel packaging is available as an option on many of the products outlined in this chapter.
Unless individual data sheets state Tape and Reel packaging, items will be bulk packed. Please note: only complete reels are sold.
BU = Bulk packed
TR = Tape & Reel packed
Additional Text Code
If the product is non-standard, the letter ‘T’ will appear at the end of the product specification. This refers to additional text on the quotation/sales order to identify the non-standard requirements.
Outline Drawings
Dimensions on the Clock Oscillators drawings are shown only as a guide. Precise dimensions of the Clock Oscillators holders are available upon request. All dimensions are shown in mm and are nominal unless otherwise stated.
Marking
Product will be indelibly marked as detailed in the individual data sheets. 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