DA9279.003
13 July 2006
MAS9279
IC FOR 10.00 – 52.00 MHz VCTCXO
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DESCRIPTION
The MAS9279 is an integrated circuit well suited to
build high end VCTCXO for telecommunication.
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 only crystal is required in
addition to MAS9279. The compensation method is
fully analog, working continuously without
generating any steps or other interference.
Fourth Order Compensation
Frequency Stability +/- 0.3
ppm
Wide Frequency Range
Very Low Phase Noise
Low Voltage
Minimum Operating
Temperature –40 °
C
Tri State CMOS Output
FEATURES
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Very small size
Minimal current consumption
Wide operating temperature range
Very low phase noise
Programmable VC-sensitivity
Minimum operating temperature –40 °
C
Oscillator frequency output f
0
/2 version
available
APPLICATIONS
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VCTCXO for high end telecommunications
systems
TCXO for high end telecommunication
systems
BLOCK DIAGRAM
DA
CLK
PV
Fourth
Term
CUB
INF
SENS
LIN
4
f(T)
5
3
8
TE1
Σ
T
Vref
TMux
TE2
f(T)
VC
CDAC1
6
4
VDD
CDAC2
OUT
VSS
X2
X1
1 (10)
MAS [ MICRO ANALOG SYSTEMS ]
