MAS9280 Datasheet, PDF (1/8 Pages) Micro Analog systems – IC FOR 18.00 - 40.00 MHz VCTCXO

This is preliminary information on a new
product under development. Micro Analog
Systems Oy reserves the right to make any
changes without notice.
DA9280.003
13 July 2006
MAS9280
IC FOR 18.00 – 40.00 MHz VCTCXO
• Min. Supply Voltage 2.4 V
• Max. Frequency 40 MHz
• True Sine Wave Output
• Frequency Stability +/- 1.5 ppm
• Suitable Also for Low Pull
Crystals
• Very Low Phase Noise
DESCRIPTION
The MAS9280 is an integrated circuit well suited to
build VCTCXO for mobile communication.
Temperature calibration is achieved in three
calibration temperatures only. The trimming is done
through a serial bus and the calibration information
is stored in an internal PROM. This means no
rework for trimming is needed.
FEATURES
• Very small size
• Minimum Vdd 2.4V
• No voltage reference capacitor needed
• Phase noise <-110 dBc/Hz at 100 Hz and
<-130 dBc/Hz at 1kHz @ 32 MHz crystal
• Programmable VC-sensitivity
• Oscillator frequency output f_o /2 versions
available
BLOCK DIAGRAM
To build a VCTCXO additionally only a crystal is
required. The compensation method is fully analog,
working continuously without generating any steps
or other interference.
Divider function allows the usage of double
frequency crystal.
APPLICATIONS
• VCTCXO for mobile phones
• VCTCXO for other telecommunications
systems
DA
CLK
PV
CUB ⁴
INF 4
SENS 4
f(T)
Σ
f(T)
LIN 8
VC
CDAC1 ⁸
VDD
CDAC2 ²
VSS
X2
MAS9280
TE1
TE2
T
Vref TMux
OUT
X1
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