Crystals  Circuit notations and abbreviations

On electrical schematic diagrams, crystals are designated with the class letter Y (Y1, Y2, etc.). Oscillators, whether they are crystal oscillators or others, are designated with the class letter G (G1, G2, etc.). Crystals may also be designated on a schematic with X or XTAL, or a crystal oscillator with XO.

Crystal oscillator types and their abbreviations:

ATCXO — Analog temperature controlled crystal oscillator
CDXO — Calibrated dual crystal oscillator
DTCXO — Digital temperature compensated crystal oscillator
EMXO — Evacuated miniature crystal oscillator
GPSDO — Global positioning system disciplined oscillator
MCXO — Microcomputer-compensated crystal oscillator
OCVCXO — oven-controlled voltage-controlled crystal oscillator
OCXO — Oven-controlled crystal oscillator
RbXO — Rubidium crystal oscillators (RbXO), a crystal oscillator (can be an MCXO) synchronized with a built-in rubidium standard which is run only occasionally to save power
TCVCXO — Temperature-compensated voltage-controlled crystal oscillator
TCXO — Temperature-compensated crystal oscillator
TMXO – Tactical miniature crystal oscillator
TSXO — Temperature-sensing crystal oscillator, an adaptation of the TCXO
VCTCXO — Voltage-controlled temperature-compensated crystal oscillator
VCXO — Voltage-controlled crystal oscillator