Chip-Scale Atomic Clock SA.45s
The MICROCHIP SA.45s chip-scale atomic clock supplied by Wuhan Puxian Technology consumes as little as<120mW and occupies<17cc (40.6mm*35.5mm*11.4mm). It offers120-second fast startup and1PPS locking. Standard CMOS-level10MHz and1PPS outputs provide short-term stability (Allan variance) of2.5E-10@1s, aging of3E-10/month, and temperature characteristics of5E-10 over-10℃ ~ +70℃; an extended-temperature version covers-40℃ ~ +85℃. The1PPS output can synchronize to an external reference1PPS with±100ns accuracy. A1PPS input can also lock its1PPS and frequency outputs to1ns and1.0E-12, respectively. A standard CMOS-level RS-232 serial interface provides control and calibration, status monitoring, and access to the SA.45s internal time-of-day information (TOD). CSAC also supports an ultralow-power mode in which the physics package is temporarily switched off and the device operates like a free-running TCXO. The physics package periodically restarts and relocks the TCXO; average consumption in this mode is only<50mW.
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Overview
Specifications
| Parameter | Value |
|---|---|
| RF Outputs-Frequency [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Option001] | 10 MHz |
| 1PPS Output-Pulse Width [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Option001] | 100 µs |
| RF Outputs-Frequency [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Option003] | 16.384 MHz |
| 1PPS Output-Pulse Width [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Option003] | 97.656 µs |
| RF Outputs-Format [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | CMOS |
| RF Outputs-Amplitude [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 0V~VCC |
| RF Outputs-Load Impedance [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 MΩ |
| RF Outputs-Quantity [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 |
| 1PPS Output-Rise/fall Time [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；10%~90%；Load Capacitance10pF] | <10 ns |
| 1PPS Output-Level [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 0V~VCC |
| 1PPS Output-Logic High [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；VOH Min] | 2.80 V |
| 1PPS Output-Logic Low [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；VOL Max] | 0.30 V |
| 1PPS Output-Load Impedance [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 MΩ |
| 1PPS Output-Quantity [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 |
| 1PPS Input-Format [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | Rising edge |
| 1PPS Input-Low Level [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | <0.5 V |
| 1PPS Input-High Level [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 2.5V~VCC |
| 1PPS Input-Load Impedance [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 MΩ |
| 1PPS Input-Quantity [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 |
| Serial Communications-Protocol [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | RS-232 |
| Serial Communications-Format [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | CMOS0V~VCC |
| Serial Communications-Tx/Rx Impedance [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 MΩ |
| Serial Communications-Baud Rate [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 57600 |
| Built-In Test Equipment Output-Format [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | CMOS0V~VCC |
| Built-In Test Equipment Output-Load Impedance [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1 MΩ |
| Power Input-Operating [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | <120 mW |
| Power Input-Warmup [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | <140 mW |
| Power Input-Input Voltage [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；VCC] | 3.3±0.1 VDC |
| Operating Temperature [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | -10~70 °C |
| Maximum Frequency Change over Operating Temp Range [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Maximum rate of change0.5°C/minute] | ±5×10⁻¹⁰ |
| Frequency Change Over Allowable Input Voltage Range [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | ±4×10⁻¹⁰ |
| Magnetic sensitivity [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；≤2.0Gauss] | ±9×10⁻¹¹ |
| Radiated Emissions [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；properly mounted onto host PCB] | Compliant to FCC part15,Class B |
| Vibration [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | Maintains lock under MIL-STD-810G,Operational,7.7grms per Figure514.7E-1.Category24 |
| Humidity [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；MIL-STD-810,Method507.4] | 0~95 %RH |
| Storage and Transport-Temperature [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Non-operating] | -55~85 °C |
| Storage and Transport-Temperature [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Non-operating；RoHS-Compliant] | -55~100 °C |
| Storage and Transport-Vibration [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Non-operating] | MIL-STD-810G,7.7grms per Figure514.7E-1.Category24 |
| Storage and Transport-Shock [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Non-operating] | MIL-STD-202-213A,Condition E,1000g |
| Warm-up Time [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | <180 s |
| Analog Tuning-Range [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | ±2.2×10⁻⁸ |
| Analog Tuning-Resolution [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1×10⁻¹¹ |
| Analog Tuning-Input [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；into100kΩ] | 0~2.5 V |
| Digital Tuning-Range [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | ±1×10⁻⁶ |
| Digital Tuning-Resolution [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1×10⁻¹² |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency1Hz；Option001] | <-50 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency1Hz；Option003] | <-46 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency10Hz；Option001] | <-70 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency10Hz；Option003] | <-66 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency100Hz；Option001] | <-113 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency100Hz；Option003] | <-104 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency1kHz；Option001] | <-128 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency1kHz；Option003] | <-128 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency10kHz；Option001] | <-135 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency10kHz；Option003] | <-135 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency100kHz；Option001] | <-140 dBc/Hz |
| Phase Noise [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；SSB；offset frequency100kHz；Option003] | <-140 dBc/Hz |
| Frequency Accuracy-Maximum Offset at Shipment [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | ±5×10⁻¹¹ |
| Frequency Accuracy-Maximum Retrace [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；48hrs Off] | ±5×10⁻¹⁰ |
| Frequency Accuracy-1PPS Sync [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | ±100 ns |
| Aging [VCC=3.3VDC; ambient 25°C unless otherwise specified; Monthly; after 30days of continuous operation] | <9×10⁻¹⁰ |
| Aging [VCC=3.3VDC; ambient 25°C unless otherwise specified; Yearly; after 30days of continuous operation] | <1×10⁻⁸ |
| Short-Term Stability [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Allan Deviation；τ=1s] | 3×10⁻¹⁰ |
| Short-Term Stability [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Allan Deviation；τ=10s] | 1×10⁻¹⁰ |
| Short-Term Stability [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Allan Deviation；τ=100s] | 3×10⁻¹¹ |
| Short-Term Stability [VCC=3.3VDC； Environment 25°C， Unless otherwise specified ；Allan Deviation；τ=1000s] | 1×10⁻¹¹ |
| Weight [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | <35g (<1.23oz) |
| Size [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | 1.6″×1.39″×0.45″ |
| MTBF [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | >100000 hours |
| RoHS [VCC=3.3VDC； Environment 25°C， Unless otherwise specified] | RoHS2 (Directive2011/65/EU) |
Applications
Key Features
Datasheet
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