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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

•

Electrically Trimmable

• Very Low Phase Noise

•

Low Cost

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

APPLICATIONS

•

Very small size

•

Minimum current draw

•

Wide operating temperature range

•

Phase noise <-130 dBc/Hz at 1 kHz offset

•

VCTCXO for mobile phones

•

VCTCXO for other telecommunications

systems

BLOCK DIAGRAM

MAS1175

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