SA.45s CSAC Options 001 and 003
Chip-Scale Atomic Clock
CSAC
Microsemi invented portable atomic timekeeping
with the world's rst family of miniature and chip scale
atomic clocks.
Choose CSAC for best-in-class stability, size, weight,
and power consumption.
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
Applications
1
• GPS receivers
• Backpack radios
• Anti-IED jamming systems
• Autonomous sensor networks
• Unmanned vehicles
• Underwater sensor systems
• Stability for various other
communication and transmission
applications
1
The CSAC is not tested, qualified, or rated for space applications.
With an extremely low power
consumption of <120 mW and a
volume of <17 cc, the Microsemi
SA.45s Chip Scale Atomic Clock
(CSAC) brings the accuracy and
stability of an atomic clock to portable
applications for the first time.
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 long-
term 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.
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.
It also uses the 1PPS input to discipline
