DA9280.003

13 July 2006

1 (8)

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.

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

APPLICATIONS

•

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

•

available

•

VCTCXO for mobile phones

•

VCTCXO for other telecommunications

systems

BLOCK DIAGRAM

T

Vref

TMux

Σ

DA

CLK

PV

VSS

VC

VDD

4

4

f(T)

f(T)

4

8

CUB

INF

SENS

LIN

8

CDAC1

CDAC2

TE1

TE2

X2

OUT

X1

2

MAS9280

This is preliminary information on a new

product under development. Micro Analog

Systems Oy reserves the right to make any

changes without notice.