CPT Atomic Clock CT40

The CT40 CPT atomic clock is a miniature atomic clock based on the Coherent Population Trapping (CPT) principle, which outputs an accurate and stable 10MHz standard frequency signal and 1PPS pulse signal.

The dimension of CT40 CPT atomic clock is compatible with SA.45s chip clock, and can work in time-frequency boards and modules. It has UART frequency calibration interface and external electrical tuning interface.

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Technical Specifications

Output Signal Feature
Serial	Item		Parameter
1	Output Frequency		10MHz
2	Wave Type		Square
3	Electrical Level		3.3V
4	Phase Noise (SSB)	10Hz	≤-90dBc/Hz
		100Hz	≤-120dBc/Hz
		1kHz	≤-140dBc/Hz
		10kHz	≤-145dBc/Hz
Output 1PPS feature
Serial	Item		Parameter
1	Amplitude		3.3V±0.2V
2	Pulse Width		＞1 μs
3	Rising Time		＜10 ns
Frequency Feature
Serial	Item		Parameter
1	Relative Error		≤±5.0E-11
2	Frequency Stability(Allan)	δy(1s)	≤1.0E-10
		δy(10s)	≤3.0E-11
		δy(100s)	≤1.0E-11
3	Drift (Power-on 1d)		≤1.0E-11/d
4	Temperature Feature(-55℃～+80℃)		≤1.0E-9
5	Power-on Feature	Lock Time	≤5min
6	Frequency Adjustment	Range	≥±2E-8
		Ratio	≤1E-12
7	Frequency Error (Tamed 2h)		≤±1.0E-12/d

Sync and Holdover Performance
Serial	Item		Parameter
1	1PPS Sync Error		≤50ns
2	Holdover (1d @ Tamed 1d)		≤3μs
Power and Consumption
Serial	Item		Parameter
1	Voltage		+3.2Vdc～+3.4Vdc
2	Start Consumption		≤5W
3	Rated Consumption (Normal Temperature)		≤2W
Status Indicator
Serial	Item		Parameter
1	Status	Lock	0V～0.4V
		Unlock	2.2V～3.4V
Physical Parameter
Serial	Item		Parameter
1	Weight		≤50g
Environment Feature
Serial	Item		Parameter
1	Working Temperature		-55℃～+80℃
2	Storage Temperature		-55℃～+85℃
3	Dynamic Environment		Suitable for dynamic application
4	Magnetism		≤2 Gauss
Reliability
Serial	Item		Parameter
1	MTBF		≥100000h