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RFPT200

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The CHARON is a SPI controlled high accuracy TCXO with embedded timer and alarm

function.

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The Charon is a high stability 7x5 SMD Digitally Controlled Temperature Controlled

Crystal Oscillator (DCTCXO) designed and specified to bring together the highest

stability TCXO performance with digital frequency control, separate low frequency

output, timer and alarm functionality.

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Product description

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Serial Peripheral Interface (SPI) controlled high accuracy TCXO with embedded timer and

alarm function.

Using Rakon’s advanced Pluto™ analogue frequency compensation system,

the DCTCXO achieves unrivalled frequency stability. A custom ASIC, Charon (Pluto’s moon)

has been designed to closely interface with the Pluto™ ASIC to provide the extra enhanced

functionality in a miniature 7x5 SMD package. In addition to market leading stability the

Charon device features integrated timing and control functions. A low frequency timing pulse

is derived from a programmable division ratio of the high stability oscillator. This drives the

onboard 32 bit timer, which coupled to a 32 bit programmable comparator and alarm

circuitry, enables a system to enter a low power standby mode and be woken at a precise

time in the future. All digital control is via a standard 4-wire SPI interface.

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Applications

Military

Other

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Features

32 bit timer

32 bit comparator with alarm output

Low frequency timing pulse

Digital frequency adjustment

Low power standby mode

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Specifications

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1.0

SPECIFICATION REFERENCES

Line

Parameter

Description

1.1

Model description

RFPT200 'Charon'

1.2

RoHS compliant

Available on request

1.3

Package size available

7.0 mm x 5.0 mm x 2.8 mm

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2.0

FREQUENCY CHARACTERISTICS

Line

Parameter

Test Condition

Value

Unit

2.1

Frequency range

Frequency range available depends on output type (Note 1)

3 to 40

MHz

2.2

Frequency calibration

At 25°C at mid-range of DAC, reference nominal frequency

±0.5 to 1

ppm

2.3

Frequency stability

over temperature

Reference to (Fmax+Fmin)/2. Max ±0.15 ppm only available over

-20°C to 70°C (Note 2)

±0.15 to 2

ppm

2.4

Temperature range

The operating temperature range over which the frequency

stability is measured (Note 3)

-55 to 95

°C

2.5

Stability vs. supply

voltage changes

±5% variation in supply voltage.

Nominal value ±0.1 ppm

±0.05 to

0.2

ppm

2.6

Stability vs. load

changes

±10% variation in load.

Nominal value ±0.1 ppm

±0.05 to

0.2

ppm

2.7

Long term stability

At 25°C, first year.

Nominal value ±1 ppm

±0.5 to 2

ppm

2.8

Long term stability

At 25°C, 10 years predicted, including first year.

Nominal value ±3 ppm

±2 to 5

ppm

2.9

Drift due to reflow

soldering

At 25°C, at mid-range of DAC, 24 hours after reflow.

±0.5 to 1

ppm

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