DA1175.008
13 July, 2006
MAS1175
IC FOR 10.00 – 20.00 MHz VCTCXO
Low Power
Wide Supply Voltage Range
True Sine Wave Output
Very High Level of Integration
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Electrically Trimmable
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Very Low Phase Noise
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Low Cost
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DESCRIPTION
The MAS1175 is an integrated circuit well suited to
build VCTCXO for mobile communication. Only two
external components are needed. Temperature
calibration is achieved with three calibration points
only. The trimming is done through a serial bus and
the calibration information is stored in an internal
PROM.
To build a VCTCXO only two additional
components, a varactor and a crystal are needed.
The compensation method is fully analog. IC
compensation work is continuous without
generating any steps or other interferences.
FEATURES
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Very small size
Minimum current draw
Wide operating temperature range
Phase noise <-130 dBc/Hz at 1 kHz offset
VCTCXO for mobile phones
APPLICATIONS
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VCTCXO for other telecommunications
systems
BLOCK DIAGRAM
DA
CLK
PV
VC
CUB
INF
SENS
LIN
4
4
f(T)
MAS1175
TE1
4
Σ
f(T)
8
T
Vref
TMux
TE2
CDAC1
8
VDD
CDAC2
2
OUT
X2
X1
VSS
1 (9)
MAS [ MICRO ANALOG SYSTEMS ]
