CFPT-9025 Series High Performance TCXO/TCVCXO
ISSUE 3; 1 FEBRUARY 2006
Recommended for New Designs
Delivery Options
■
Please contact our sales office for current leadtimes
Description
■
The CFPT-9025 series of temperature compensated
crystal oscillators provide for ultra high stabilities down
to ±0.3ppm and operating temperature ranges as wide as
–55 to +125°C. The oscillator uses C-MAC’s latest custom
ASIC "Pluto", a single chip oscillator and analogue
compensation circuit. Due to its unique mechanical
construction the CFPT-9025 series is able to withstand
20,000 G’s acceleration, which makes it the TCXO of
choice for gun hardened GPS navigation systems
Standard Frequencies
■
9.6, 10.0, 11.68, 12.504, 12.8, 13.0, 14.4, 16.3676, 19.44,
20.0, 21.73875, 24.5535, 38.88, 40.96, 47.032, 49.152,
51.84 MHz
Non-standard Frequencies in the range 1.0 MHz to 75.0 MHz
(see table) are available on request, contact sales office.
Output Waveform
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Square HCMOS 15pF load
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Square ACMOS 50pF max. load
■
Sinewave >1.0pk-pk, 10k
Ω // 10pF load
■
Clipped sinewave >0.81Vpk-pk, 10k
Ω // 10pF load
Sinewave and clipped sinewave signals are superimposed
on a DC offset, to remove this offset insert an external
coupling capacitor in series with the output
Supply Voltage
■
3.3 and 5.0V, see table, non-standard supply voltages in
the range 2.4 to 6.0V are available on request, contact
sales office
Current Consumption
■
HCMOS Typically
≈
1+Frequency(MHz)*Supply(V)*{Load(pF)+15}*10-3 mA
E. g. 20MHz, 5V, 15pF
≈ 4mA
■
ACMOS Typically
≈
1+Frequency(MHz)*Supply(V)*{Load(pF)+23}*10-3 mA
■
Sinewave < 8 mA
■
Clipped Sinewave Typically
≈
1+Frequency(MHz)*1.2*{Load(pF)+30}*10-3 mA
Package Outline
■
Low Profile, 7.6 x 9.3 x 3.2 mm SMD package with High
Temperature Co-fired Ceramic base and metal cover
Ageing
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±1ppm maximum in first year
■
±5ppm maximum for 10 years
Frequency Stability
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Temperature: see table
■
Typical Supply Voltage Variation ±10%
< ±0.2 ppm
■
Typical Load Coefficient ±10%
< ±0.1 ppm
Frequency Adjustment
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Three options with external Control Voltage applied to
pad 1:
A - Ageing adjustment: > ±5ppm (Standard Option)
B - No frequency adjustment initial calibration @ 25°C
< ±0.5 ppm
C - High Pulling ±10ppm to ±50ppm and non-standard
control voltage ranges may be available depending
on frequency and stability options. Please consult
our sales office
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Linearity
< 1%
■
Slope
Positive
■
Input resistance
> 100k
Ω
■
Modulation bandwidth
> 2kHz
■
Standard control voltage ranges:
Without reference voltage
- Vs=5.0V Vc=2.5V±2V
Without reference voltage
- Vs=3.3V Vc=1.65V±1V
With reference voltage
- Vc=0V to Vref
Reference Voltage, Vref
■
Optional reference voltage output on pad 2, suitable for
potentiometer supply or DAC reference.
1. No output (Standard option)
2. 2.2V, for Min. Vs>2.4V
3. 2.75V, for Min. Vs>3.0V
4. 4.2V, for Min. Vs>4.5V
Maximum load current 100µA
For manual frequency adjustment connect an external
50k
Ω potentiometer between pad 2 (Reference Voltage)
and pad 3 (Ground) with wiper connected to pad 1
(Voltage Control). Please specify reference voltage as a
part of the ordering code
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