Frequency and Timing SA.45s CSAC and RoHS CSAC Options 001 and 003 Chip-Scale Atomic Clock Features Power consumption <120 mW With an extremely low power consump- A standard CMOS-level RS-232 serial Less than 17 cc volume, tion of <120 mW and a volume of interface is built in to the SA.45s. This 1.6 1.39 0.45 <17 cc, the Microchip SA.45s Chip is used to control and calibrate the unit 10 MHz CMOS-compatible output Scale Atomic Clock (CSAC) brings the and also to provide a comprehensive 1PPS output and 1PPS input for accuracy and stability of an atomic set of status monitors. The interface is synchronization clock to portable applications for the also used to set and read the CSACs RS-232 interface for monitoring and first time. The CSAC is also available in internal time-of-day clock. control a RoHS-compliant form. Short term stability (Allan Deviation) of 10 3.0 10 at =1 sec The SA.45s provides RF and 1PPS 1 outputs at standard CMOS levels, with Applications short-term stability (Allan Deviation) of GPS receivers 10 Backpack radios 3.0 10 at = 1 sec, typical longterm 10 Anti-IED jamming systems aging of <9 10 /month, and maxi- 10 Autonomous sensor networks mum frequency change of 5 10 Unmanned vehicles over an operating temperature range of Underwater sensor systems 10 C to 70 C. Stability for various other communication and transmission The SA.45s CSAC accepts a 1PPS applications input that may be used to synchronize RoHS-Compliant CSAC the units 1PPS output to an external RoHS 2 (Directive 2011/65/EU) reference clock with 100 ns accuracy. Wide storage temperature: 100 C It also use the 1PPS input to discipline 1 its phase and frequency to within 1 ns The CSAC is not tested, qualified, or rated for space applications. 12 and 1.0 10 , respectively. www.microchip.com1 Specifications Electrical Environmental RF Outputs Specification Details 10 MHz (option 001) Operating Temperature 10 C to 70 C Frequency 16.384 MHz (option 003) Maximum Frequency Change over 10 Format CMOS Operating Temp Range (Maximum 5 10 Rate of Change 0.5 C per Minute) Amplitude 0 V to V CC Frequency Change Over 10 Load Impedance 1 M 4 10 Allowable Input Voltage Range Quantity 1 11 Magnetic sensitivity (2.0 Gauss) 9 10 /Gauss 1PPS Output Compliant to FCC part 15, Radiated Emissions Class B, when mounted properly Rise/fall Time (10%90%) <10 ns onto host PCB at Load Capacitance 10 pF Maintains lock under MIL-STD- 100 s (Option 001) Pulse Width Vibration 810G, Operational, 7.7 g per 97.656 s (Option 003) rms Figure 514.7E-1. Category 24 Level 0 V to V CC 0%95% RH per MIL-STD-810, Logic High (V ) Min 2.80 V Humidity OH Method 507.4 Logic Low (V ) Max 0.30 V OL Storage and Transport (Non-operating) Load Impedance 1 M Temperature 55 C to 85 C Quantity 1 Temperature (RoHS-Compliant) 55 C to 100 C 1PPS Input MIL-STD-810G, 7.7 g per rms Vibration Format Rising edge Figure 514.7E-1. Category 24 Low Level <0.5 V MIL-STD-202-213A, Condition E, Shock 1000 g High Level 2.5 V to V CC Load Impedance 1 M Performance Parameters Quantity 1 Specification Details Serial Communications Warm-up Time <180 s 8 Protocol RS-232 Range: 2.2 10 11 Analog Tuning Resolution: 1 10 Format CMOS 0 V to V CC Input: 0 V2.5 V into 100 k Tx/Rx Impedance 1 M 6 Range: 1 10 Digital Tuning Baud Rate 57600 12 Resolution: 1 10 Built-In Test Equipment (BITE) Output Phase Noise (SSB) Format CMOS 0 V to V CC Frequency Option 001 Option 003 Load Impedance 1 M 1 Hz <50 dBc/Hz <46 dBc/Hz 0= Normal operation Logic 1= Alarm 10 Hz <70 dBc/Hz <66 dBc/Hz Power Input 100 Hz <113 dBc/Hz <104 dBc/Hz 1 kHz <128 dBc/Hz <128 dBc/Hz Operating <120 mW 10 kHz <135 dBc/Hz <135 dBc/Hz Warmup <140 mW 100 kHz <140 dBc/Hz <140 dBc/Hz Input Voltage (V ) 3.3 0.1 V CC DC 1 At input voltage V = 3.3 V and ambient temperature = 25 C, unless otherwise specified. Frequency Accuracy CC DC 11 Maximum Offset at Shipment 5 10 Maximum Retrace 10 5 10 (48 hrs Off) 100 ns 1 PPS Sync www.microchip.com