IoT & Wearables
Battery-powered nodes often favor low-power CMOS XO for MCU clocks. When accurate backhaul timing or GNSS-assisted features are required, TCXO adds sub-ppm stability with modest power overhead. Keep decoupling close (0.1 µF) and route away from switching rails.
Telecom & Network Sync
For Sync-E/PTP 1588, use low-noise TCXO or VCXO in PLLs; for holdover references and primary timing, OCXO provides ppb-class stability. Consider warm-up times and airflow around the OCXO can.
High-Speed SerDes
Start from the PHY’s allowed integrated phase jitter (e.g., 12 kHz–20 MHz). Differential outputs (LVDS/LVPECL) and clean rails improve margin. Check fan-out and termination at the receiver.
GNSS & Positioning
Use a TCXO with tight stability (±0.5 ppm or better) to reduce wander and improve TTFF. For time servers or disciplined oscillators, pair a TCXO/OCXO with GNSS disciplining.
Industrial & Harsh Environments
Choose packages and specs rated for −40~+105/125 °C. Consider g-sensitivity and startup time. Keep traces short and avoid noisy zones and hot components.
Quick model picks (application × model)
| Application | Recommended family / models | Key specs | Notes |
|---|---|---|---|
| IoT & Wearables | XO (FCO series) — e.g., FCO-3C-UP; TCXO (FVT series) — e.g., FVT-7S-WT | Low power; stability up to ±0.5 ppm (TCXO) | Keep 0.1 µF decoupling close; route away from switchers |
| GNSS & Positioning | TCXO (FVT series) — e.g., FVT-7S-WT, FVT-9S-LN | ±0.5 ppm or better; low short-term jitter; wide temp | Improves TTFF/holdover; consider clipped-sine outputs |
| Telecom & Sync | VCXO (FVC series) — e.g., FVC-7P-LJ; OCXO (FOC series) — e.g., FOC-6S / FOC-4D | Low phase noise; ppb-class stability (OCXO) | Account for warm-up and airflow around OCXO cans |
| High-Speed SerDes | Low-jitter XO — e.g., FCO-6P-PJ (FASTXO) | ≤1 ps RMS (12 kHz–20 MHz) typical | Prefer LVDS/LVPECL where supported; ensure termination |
| Industrial / Harsh | Wide-temp XO — e.g., FCO-3C-WT / FCO-2C-WT | −40~+105/125 °C; fast start-up; robust package | Mind g-sensitivity; keep traces short; avoid hot zones |
Related links
References & further reading
FAQ
Which oscillator is best for battery devices?
Start with low-power CMOS XO; move to TCXO if you need tighter frequency stability or GNSS assistance.
Do I need differential outputs for SerDes?
Often yes. LVDS/LVPECL help meet integrated phase-jitter targets on high-speed links; follow the PHY vendor’s termination guide.
When is OCXO required?
When long-term accuracy/holdover or ultra-low phase noise is critical—telecom base stations, time servers, and precision instruments.
