Frequency and Timing
SA.45s CSAC and RoHS CSAC Options 001 and 003
Chip-Scale Atomic Clock
Features
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Power consumption <120 mW
Less than 17 cc volume,
1.6" × 1.39" × 0.45"
With an extremely low power consump-
tion 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
first time. The CSAC is also available in
a RoHS-compliant form.
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.
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10 MHz CMOS-compatible output
1PPS output and 1PPS input for
synchronization
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RS-232 interface for monitoring and
control
Short term stability (Allan Deviation) of
3.0 × 10–10 at τ =1 sec
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 maxi-
mum frequency change of ±5 × 10–10
over an operating temperature range of
–10 °C to 70 °C.
Applications1
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GPS receivers
Backpack radios
Anti-IED jamming systems
Autonomous sensor networks
Unmanned vehicles
Underwater sensor systems
Stability for various other
communication and transmission
applications
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.
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RoHS-Compliant CSAC
•ꢀ RoHS 2 (Directive 2011/65/EU)
•ꢀ Wide storage temperature: 100 °C
1The CSAC is not tested, qualified, or rated for space applications.
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