DA9280.003
13 July 2006
MAS9280
This is preliminary information on a new
product under development. Micro Analog
Systems Oy reserves the right to make any
changes without notice.
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.
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.
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
APPLICATIONS
•
•
VCTCXO for mobile phones
VCTCXO for other telecommunications
systems
BLOCK DIAGRAM
DA
CLK
PV
VC
CUB
INF
SENS
LIN
4
4
f(T)
MAS9280
TE1
4
Σ
f(T)
8
T
Vref
TMux
TE2
CDAC1
8
VDD
CDAC2
2
OUT
X2
X1
VSS
1 (8)