Surface mount Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO) in a miniature 1.6 x 1.2mm surface mount package. Frequency Parameters Frequency 19.2MHz to 52.0MHz Frequency Tolerance ±1.50ppm Tolerance Condition @ 25°C ±2°C Frequency Stability ±0.50ppm Ageing ±1ppm m.