This document describes the features and characteristics of the Micro Miniature OCXO VFT8 series products produced by ECM Electronics Limited. The series has the smallest size and extremely low power consumption, with features such as fast warm-up, low phase noise, and low aging.
The ECM VFT8 Series is a micro‑miniature oven‑controlled crystal oscillator (OCXO) offering low phase noise, low aging, and a surface‑mount option.
This manual presents the device’s electrical specifications, performance data, power consumption, and wiring information to aid integration into equipment.
| Frequency Range | 4.80 to 50.0 MHz |
|---|---|
| Frequency Stability (Temp) | ±100 ppb max vs Temp |
| Frequency Stability (Supply) | ±5 ppb max vs Supply |
| Aging per Day | 5 × 10⁻¹⁰ |
| Aging per Year | 1 × 10⁻⁷ |
| Allan Variance | 1 × 10⁻¹¹ (0.1 s to 10 s) |
| G‑sensitivity | ±1 ppb/G max |
| Input Voltage | 5 V ±4 % (12 V optional) |
| Steady‑state Current @5 V | 25 mA (typical) |
| Start‑up Current | 100 mA |
| Load Impedance | 10 kΩ // 15 pF |
| Warm‑up Time | 35 s typical to 0.1 ppm (20 s @12 V) |
| Output Waveform | 3.3 V HCMOS/TTL compatible |
| Pulling Range | ±0.5 ppm to ±1 ppm |
| Setability Voltage | 1.0 V min – 3.0 V max @25 °C |
The device operates from 4.80 MHz up to 50.0 MHz.
Typical warm‑up time is 35 seconds to reach 0.1 ppm, with a 20‑second option when powered at 12 V.
It requires a 5 V supply with ±4 % tolerance, and a 12 V option is also available.
The G‑sensitivity is ±1 ppb per G maximum.