Crystal oscillators' output wave

CMOS, HCMOS, LVCMOS, Sinewave, Clipped Sinewave, TTL, PECL, LVPECL, LVDS, CML…Oscillators and frequency control devices come with a range of different output buffer types and each type has its own advantages and disadvantages. The aim of this application note is to provide some background on each type and to provide advice on some approaches to terminating devices with such outputs.

 

Different output wave match with apropriate supply voltage to effect the whole design.HCMOS stands for High Speed CMOS and is a higher speed variant on the originalCMOS – the terms HCMOS and CMOS are often interchangeable in the oscillatorworld. LVCMOS stands for Low Voltage CMOS and as its name suggests it is a low voltage class of CMOS. ACMOS stands for 'Advanced CMOS'.