KCCS
Precision Timing
High-precision PPS-disciplined OCXO locked to GNSS 1PPS. <=1.5 us/24h holdover accuracy. Compact 7x5x3mm module.
| Model | Package (mm) | Output | Supply | Temp. Range | Holdover Capability | Phase Noise (Typ) |
|---|---|---|---|---|---|---|
| KDO65 | DIP 65×65×18 | Sine/CMOS | 5V | -40~+85℃ | ≤±1.5 μs/24h (ΔT=±5℃) | 1kHz: -155 dBc/Hz @10MHz |
| KDO27 | DIP 36.2×27.2×15 | Sine/CMOS | 3.3V/5V | -40~+85℃ | ≤±1.5 μs/24h (ΔT=±2℃) | 1kHz: -155 dBc/Hz @10MHz |
| KDOD27L | DIP 36.2×27.2×13 | Sine/CMOS | 3.3V/5V | -55~+85℃ | 3-min locking: f-T ≤±0.5 ppb, anti-seismic, dual output | 1kHz: -155 dBc/Hz @10MHz; 1kHz: -153 dBc/Hz @160MHz |
| KDOA20 | DIP 20×20×13 | Sine/CMOS | 3.3V/5V | -40~+85℃ | ≤±1.5 μs/8h (ΔT=±10℃) | 1kHz: -155 dBc/Hz @10MHz |
| KDOB20 | DIP 20×20×13 | Sine/CMOS | 3.3V/5V | -40~+85℃ | ≤±50 μs/24h (T=±10℃) | 1kHz: -155 dBc/Hz @10MHz |
| KDOBL20 | DIP 20×20×7 | Sine/CMOS | 3.3V/5V | -40~+85℃ | f-T ≤±5 ppb | 1kHz: -143 dBc/Hz @160MHz |
A disciplined oscillator locks a high-stability OCXO to an external 1PPS reference (typically from GNSS/GPS). When the reference is available, the OCXO is continuously corrected; when lost, it enters holdover mode, maintaining accuracy based on its learned aging and temperature characteristics.
Holdover is the period when a disciplined oscillator operates without an external 1PPS reference, relying on the OCXO's intrinsic stability. KCCS disciplined OCXOs achieve <=1.5 us/24h holdover accuracy, while the micro version achieves <=5 us/24h.
KCCS 1PPS-disciplined oscillators achieve <=50 ns alignment accuracy between the output 1PPS and the input GNSS 1PPS reference when locked. Frequency accuracy while locked is <=0.01 ppm.
During GNSS outages, the disciplined oscillator enters holdover mode, maintaining timing accuracy based on the OCXO's learned behavior. KCCS units maintain <=1.5 us/24h in holdover. For extended outages, an OCXO with higher stability grade is recommended.
Our technical team can help you choose the optimal oscillator for your specific application requirements.