Microchip CSAC-SA45S Manual

Microchip Ikke kategoriseret CSAC-SA45S

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Side 1/3
SA.45s CSAC and RoHS CSAC
Opons 001 and 003
Chip-Scale Atomic Clock
microchip.com
Features
• Power consumption <120 mW
• Less than 17 cc volume,
1.6" × 1.39" × 0.45"
• 10 MHz CMOS-compatible output
• 1PPS output and 1PPS input for synchronization
• RS-232 interface for monitoring and control
• Short term stability (Allan Deviation) of 3.0 × 10–10 at τ =1
sec
• Applications1
• GPS receivers
• Backpack radios
• Anti-IED jamming systems
• Autonomous sensor networks
• Unmanned vehicles
• Underwater sensor systems
• Stability for various other communication and transmis-
sion applications
• RoHS-Compliant CSAC
• RoHS 2 (Directive 2011/65/EU)
• Wide storage temperature: 100 °C
1
The CSAC is not tested, qualied, or rated for space applications.
With an extremely low power consumption of <120 mW and
a volume of <17 cc, the Microchip SA.45s Chip Scale Atomic
Clock (CSAC) brings the accuracy and stability of an atomic
clock to portable applications for the rst time. The CSAC is
also available in a RoHS-compliant form.
The SA.45s provides RF and 1PPS outputs at standard CMOS
levels, with short-term stability (Allan Deviation) of 3.0 × 10
–10
at τ = 1 sec, typical longterm aging of <9 × 10–10/month, and
maximum frequency change of ±5 × 10–10 over an operating
temperature range of –10°C to 70°C.
The SA.45s CSAC accepts a 1PPS input that may be used to
synchronize the unit’s 1PPS output to an external reference
clock with ±100 ns accuracy. It also use the 1PPS input to
discipline its phase and frequency to within 1 ns and 1.0 ×
10–12, respectively.
A standard CMOS-level RS-232 serial interface is built in to
the SA.45s. This is used to control and calibrate the unit and
also to provide a comprehensive set of status monitors. The
interface is also used to set and read the CSAC’s internal
time-of-day clock.
Specicaons1
Electrical
RF Outputs
Frequency 10 MHz (option 001)
16.384 MHz (option 003)
Format CMOS
Amplitude 0 V to VCC
Load Impedance 1 MΩ
Quantity 1
1PPS Output
Rise/fall Time
(10%–90%) at Load
Capacitance 10 pF
<10 ns
Pulse Width 100 μs (Option 001)
97.656 μs (Option 003)
Level 0 V to VCC
Logic High (VOH) Min 2.80 V
Logic Low (VOL) Max 0.30 V
Load Impedance 1 MΩ
Quantity 1
1PPS Input
Format Rising edge
Low Level <0.5 V
High Level 2.5 V to VCC
Load Impedance 1 MΩ
Quantity 1
Serial Communications
Protocol RS-232
Format CMOS 0 V to VCC
Tx/Rx Impedance 1 MΩ
Baud Rate 57600
Built-In Test Equipment (BITE) Output
Format CMOS 0 V to VCC
Load Impedance 1 MΩ
Logic 0= Normal operation
1= Alarm
Power Input
Operating <120 mW
Warmup <140 mW
Input Voltage (VCC) 3.3 ± 0.1 VDC
1At input voltage VCC = 3.3 VDC
and ambient temperature = 25 °C, unless otherwise specied.
Environmental
Specication Details
Operating Temperature –10 °C to 70 °C
Maximum Frequency
Change over Operating
Temp Range (Maximum
Rate of Change 0.5 °C per
Minute)
±5 × 10–10
Frequency Change Over
Allowable Input Voltage
Range
±4 × 10–10
Magnetic sensitivity (≤2.0
Gauss) ±9 × 10–11/Gauss
Radiated Emissions
Compliant to FCC part 15,
Class B, when mounted properly
onto host PCB
Vibration
Maintains lock under MIL-STD-
810G, Operational, 7.7 grms per
Figure 514.7E-1. Category 24
Humidity 0%–95% RH per MIL-STD-810,
Method 507.4
Storage and Transport (Non-operating)
Temperature –55 °C to 85 °C
Temperature (RoHS-
Compliant) –55 °C to 100 °C
Vibration MIL-STD-810G, 7.7 grms per
Figure 514.7E-1. Category 24
Shock MIL-STD-202-213A, Condition E,
1000 g
Performance Parameters
Specication Details
Warm-up Time <180 s
Analog Tuning
Range: ±2.2 × 10–8
Resolution: 1 × 10–11
Input: 0 V–2.5 V into 100 kΩ
Digital Tuning Range: ±1 × 10–6
Resolution: 1 × 10–12

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: CSAC-SA45S

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