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

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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