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MAS9280

IC FOR 18.00 – 40.00 MHz VCTCXO

Micro Analog systems 

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 fo /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

1 (8)

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