CFPO-20,-21,-22,-23 TC-OCXO
ISSUE 2; 20 APRIL 2006
Preliminary Specification
Recommended for new designs
Delivery Options
■
Please contact our sales office for current leadtimes
Description
■
A series of high stability crystal oscillators, using a
hybrid combination of oven control and temperature
compensation capable of sub 0.05ppm stability. By
using a loosely controlled miniature oven that is
thermally isolated from the ambient the frequency
stability of a crystal oscillator is enhanced. Stability is
further improved by compensating the residual
frequency error with C-MAC’s proprietary ASIC “Pluto”
,
a single chip oscillator with analogue compensation
circuit. The combination of these two functions result in
an oscillator with the best stability / power consumption
ratio and fast warm-up, making it particularly suitable
for battery powered applications
Standard Frequencies
■
HCMOS only: 5, 6.4, 8, 8.192MHz
■
HCMOS & Clipped Sinewave 10.0, 12.8, 16.0, 16.384
and 20.0MHz
■
Other frequencies in the range 1.25 to 33MHz may be
available upon request
Waveform
■
Standard
Square HCMOS 15pF load
Clipped Sinewave 10kΩ
//
10pF AC-coupled
,
■
Optional
Square ACMOS 50pF max. load
Sinewave 10kΩ // 10pF DC-coupled
,
Supply Voltage
■
Operating range 3.3V or 5.0V, see table.
Input Power
■
Warm-up
■
Steady state @ 25°C
■
Steady state @ -20°C
■
Steady state @ -40°C
-20 to 70°C
< 1.0W
< 270mW
< 400mW
-40 to 85°C
< 1.0W
< 350mW
< 525mW
< 600mW
Frequency Stability
■
Temperature: see table
■
Supply Voltage Variation, ±5% ±0.1ppm typ.
■
Load Coefficient, 15pF ±5pf (HCMOS) or 10kΩ // 10pF
±10% (clipped sinewave) ±0.1ppm typ.
Frequency Adjustment, three options
A Ageing adjustment by means of external Voltage Control
applied to pad 1 (standard option)
■
Range (frequency < 20MHz) > ±5ppm
■
Range (frequency > 20MHz) > ±7ppm
■
Linearity
< 0.5%
■
Slope
Positive
■
Input Resistance
> 100kΩ
■
Modulation Bandwidth
> 2kHz
■
Standard control voltage range 1.5V±1V
B Ageing adjustment by means of an external 100kΩ
potentiometer connected as a variable resistor from
pad 1 to ground.
■
Range (frequency < 20MHz)
> ±5ppm
■
Range (frequency > 20MHz)
> ±7ppm
C No frequency adjustment
■
Initial calibration
< ±0.5ppm
Storage Temperature Range
■
-55 to 125°C
Environmental Specification
Vibration: IEC 60068-2-6, test Fc: 10-60Hz 0.75mm
displacement, 60-2000Hz 100m/s2 (10gn) acceleration,
4 hours in each of three mutually perpendicular axes at
1 octave per minute.
■
■
Mechanical Shock: IEC 60068-2-27, test Ea; 1000m/s2
(100gn) acceleration for 6ms duration, Half sine pulse,
3 shocks in each direction along three mutually
perpendicular axes (18 shocks total)
Parts with the suffix “LF” on the ordering code and part
number are fully compliant with the European Union
directive 2002/95/EC on the restriction of the use of
certain hazardous substances in electrical and electronic
equipment. Note: The RoHS compliant parts are suitable
for assembly using both Lead-free solders and Lead/Tin
solders.
Marking: Laser Marked
■
OCXOs
■
Warm-up time to reach ±0.01ppm of final frequency
■
< 30 secs. (@25°C)
Ageing
±1ppm
■
±2ppm
■
±3ppm
■
±5ppm
■
±1ppm
■
maximum
maximum
maximum
maximum
maximum
in first year, frequency < 20MHz
in first year, frequency > 20MHz
for 10 years, frequency < 20MHz
for 10 years, frequency > 20MHz
after reflow
Marking, includes
■
CMAC
■
Part number (Pxxxx)
■
Pad 1 / Static sensitivity
identifier (triangle)
■
Device date / location code
(YYWWL)
Package
■
Hermetically sealed, industry standard, DIL 14/4
leaded package
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia
Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Website: www.cmac.com
Phase Noise (typical figures)
Frequency offset from carrier
Frequency
10Hz
12.8MHz
-95dBc/Hz
100Hz
-115dBc/Hz
1kHz
-135dBc/Hz
10kHz
-140dBc/Hz
100kHz
-145dBc/Hz
Electrical Specification - limiting values when measured in test circuit
Frequency Range Supply Voltage Output Waveform
Output Levels
Rise Time (tr)
Fall Time (tf)
Duty Cycle
Model Number
1.25 to 33.0MHz
3.3V ±5%
Square
HCMOS 15pF
VoH >90% Vs
VoL < 10% Vs
7ns
7ns
45/55%
CFPO-20
1.25 to 33.0MHz
5.0V±10%
Square
HCMOS 15pF
VoH >90% Vs
VoL < 10% Vs
8ns
8ns
45/55%
CFPO-21
10.0 to 33.0MHz
3.3V±5%
Clipped Sinewave
10kΩ//10pF
Vpk-pk >0.8V
-
-
-
CFPO-22
10.0 to 33MHz
5.0V±10%
Clipped Sinewave
10kΩ//10pF
Vpk-pk >0.8V
-
-
-
CFPO-23
Frequency Stability Available Over Operating Temperature Ranges
Frequency Stability Vs Operating Temperature Range
Operating Temperature
Ranges
±0.025ppm
±0.05ppm
±0.1ppm
-20 to 70°C
-40 to 85°C
Ordering Example
Frequency
Model No.
Frequency Stability Vs Operating Temperature Code
Frequency Adjustment
RoHS Compliance
OCXOs
±0.2ppm
Code MS
Code MX
Code PS*
-
Code RS
Code RX
14.4MHz
CFPO-20 SX A
LF
Code SS
Code SX
Note: * Codes may not be available for all frequencies
Minimum Order Information Required
■
Frequency + Model Number + Frequency Stability vs Operating Temperature Range Code + Frequency Adjustment Code
+ RoHS Compliance Code
OR
■
Discrete Part Number (suffix ‘LF’ signifies RoHS compliance)
Custom Specification
Non-standard requirements like high drive ACMOS output, low harmonic sinewave output, different supply and control volt-
ages, high frequency pulling, different stabilities and temperature ranges may be available upon request. Please contact our
sales office to discuss your requirements
Europe Tel: +44 (0)1460 270200
Americas Tel: +1 919 941 9333
Asia
Tel: +86 755 8826 5991
Fax: +44 (0)1460 72578
Fax: +1 919 941 9371
Fax: +86 755 8826 5990
Website: www.cmac.com
Embedded System
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