DA6282.001
9 January 2007
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 6.50 – 40.00 MHz VCTCXO
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Min. Supply Voltage 2.6 V
Max. Frequency 40 MHz
True Sine Wave Output
Frequency Stability ±2.0 ppm
Suitable for Ultra Small
VCTCXO
Very Low Phase Noise
MAS6282
DESCRIPTION
The MAS6282 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 only a crystal is required in
addition to MAS6282. The compensation method is
fully analog, working continuously without
generating any steps or other interference.
Output is true sine wave resulting in lower
harmonics than with clipped sine wave output.
FEATURES
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Very small size
Minimum Vdd 2.6V
No voltage reference capacitor needed
Programmable VC-sensitivity
Divider option selectable by a PROM bit
Output peak voltage (amplitude) option
selectable by a PROM bit
APPLICATIONS
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VCTCXO for mobile phones
VCTCXO for other applications
BLOCK DIAGRAM
DA
TFRPROM
TEST(2:0)
INF(4:0)
LIN(7:0)
CUB(3:0)
SCALE(4:0)
SENS(2:0)
CDACF(5:0)
CDACC(3:0)
DIV(0:0)
AMPL(0:0)
POLYNOMIAL
Thermal
sensor
VREF
TEST
MUX
TIN
MOUT
CLK
f(T)
= Ax
3
+Bx+C
OUT
FILTER
PV
VC_SENS
VC
V divider
VDD
To all blocks
CDACC
CDACF
XO
core
f
|
f
/
2
Buffer+
divider
OUT
VSS
XIN
XOUT
1 (5)
MAS [ MICRO ANALOG SYSTEMS ]
