DA9270.008

11 September 2006

1 (9)

MAS9270

IC FOR 10.00 – 30.00 MHz VCTCXO

•

Wide Supply Voltage Range

•

True Sine Wave Output

•

Very High Level of Integration

•

Electrically Trimmable

•

Very Low Phase Noise

•

Low Cost

•

Minimum Operating Temperature –40 °C

DESCRIPTION

The MAS9270 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 crystal is

required. The compensation method is fully analog,

working continuously without generating any steps

or other interference.

FEATURES

APPLICATIONS

•

Very small size

•

Minor current draw

•

Wide operating temperature range

•

Phase noise <-120 dBc/Hz at 100Hz offset

•

Programmable VC-sensitivity

•

Minimum Operating Temperature –40 °C for

MAS9270Cxx3

•

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

MAS9270