RFPT100 Datasheet, PDF (1/2 Pages) TEMEX – An emergency distress beacon is a small battery.powered

PLUTO™ TCXO DESIGNED FOR COSPAS‐SARSAT EMERGENCY BEACONS
RFPT100
An emergency distress beacon is a small battery‐powered device that can be carried on board of ships (called EPIRB = Emergency Position
Indicating Radio Beacon), aircraft (called ELT = Emergency Locator Transmitter) and on people (called PLB = Personal Locator Beacon). Once
activated it transmits a signal that is detectable by government search and rescue authorities. These beacons are regulated by Cospas‐Sarsat,
an international organisation for the search and rescue of persons in distress. The Cospas‐Sarsat system uses a constellation of satellites
orbiting the globe and a network of earth stations to provide distress alert and location information to rescue teams anywhere in the world.
Using the signals transmitted by the beacon, the system calculates its position to within a few km. The beacon's correct operation depends
to a great extent on the stability of the reference oscillator that is used to generate the 406 MHz transmitter signal.
Traditionally Oven Controlled Crystal Oscillators (OCXO) have been used for this function. However an OCXO needs significant power and
time to heat the internal oven whereas the new Rakon RFPT100 TCXO has a power consumption of only 6mW (typ.) and instantaneously
provides a stable output frequency. This results in increased battery life or alternatively allows the use of a smaller battery. The smaller
battery reduces system cost and allows future beacons to be smaller and lighter.
The RFPT100 TCXO makes use of Rakon's Pluto™ ASIC which is a fourth‐order temperature‐compensation chip. The Pluto™ ASIC uses certain
patented features, which enables it to achieve the critical medium term stability, previously unattainable with any TCXO. This unique
performance for the first time has enabled the use of compact, low‐cost TCXOs in emergency beacon applications. The Pluto™ TCXO employs
One‐Time Programmable (OTP) non‐volatile memory which ensures lifetime reliability under adverse conditions.
Features
 Low power consumption
 Cospas‐Sarsat compliant
 Medium term stability 100% tested
 Test data supplied with each unit
 Clipped Sine Wave and Voltage Control options
 Non‐volatile memory for lifetime reliability
Applications
 Emergency Beacon (EPIRB, ELT,
PLB)
 Argos beacon
 Personal Survival Radio
7.0 x 5.0 mm
Standard Specifications
Parameter
Nominal frequency
Frequency calibration
Reflow shift
Operating temperature range
Frequency stability
over temperature
Supply voltage stability
Load sensitivity
Medium term stability (MTS)¹
Long term stability (aging)
Supply voltage (V_CC)
Supply current
Root Allan Variance
Oscillator output options
Min. Typ.
Max.
Unit
10 – 20
MHz
±0.5
ppm
±1
ppm
‐40
55
°C
‐20
55
±0.2
ppm
Test Condition / Description
Standard frequencies: 10.0, 12.688375,
12.688656, 12.688750 or 16.367 MHz
Initial tolerance at 25°C
Pre to post reflow ΔF (measured ≥ 60 minutes
after reflow)
Class I
Class II
Reference to (F_MAX + F_MIN)/2
±0.1
ppm
±10% variation, reference to frequency at 3.3V
±0.1
ppm
±5pF variation, reference to frequency at 15pF
±0.7
ppb/min Mean slope (dF/dt), steady state conditions
±1.7
ppb/min Mean slope (dF/dt), during and 15 minutes after
variable temperature conditions
±2.0
ppb
Residual dF from slope
±1
ppm
1 year
±3
ppm
10 years
3.3
V
±10%
2.5
mA
Depending on nominal frequency
1*10^‐9
tau = 100ms
Clipped Sinewave: 10kΩ //10pF nominal load. HCMOS: 15pF nominal load.
1 _{Medium term stability specified and measured according to Cospas‐Sarsat 406MHz distress beacon specifications T.001, issue 3 and T.007, issue 4}
(averaged over 18 measurements in 15 minute period and following 15 minute power up period). Test results shipped with each device, identified by date
and serial number, retained for 10 years.
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