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DA9081.006

1 August, 2005

MAS9081

• Dual Band Receiver IC

•

High Sensitivity

•

Very Low Power Consumption

•

Wide Supply Voltage Range

•

Power Down Control

•

Control for AGC On

•

High Selectivity by Crystal Filter

•

Fast Startup Feature

DESCRIPTION

The MAS9081 AM-Receiver chip is a highly sensitive,

simple to use AM receiver specially intended to

receive time signals in the frequency range from 40

kHz to 100 kHz. Only a few external components are

required for time signal receiving. The circuit has

preamplifier, wide range automatic gain control,

demodulator and output comparator built in. The

output signal can be processed directly by an

additional digital circuitry to extract the data from the

received signal. The control for AGC (automatic gain

control) can be used to switch AGC on or off if

necessary. MAS9081 supports dual band operation

by switching between two crystal filters and an

additional antenna tuning capacitor.

MAS9081 has differential input and different internal

compensation capacitor options for compensating

shunt capacitances of different crystals (See ordering

information on page 12).

FEATURES

APPLICATIONS

•

Dual Band Receiver IC

•

•

Wide Supply Voltage Range from 1.1 V to 5 V

•

Very Low Power Consumption

•

Power Down Control

•

Fast Startup

•

Only a Few External Components Necessary

•

Control for AGC On

•

Wide Frequency Range from 40 kHz to 100 kHz

•

High Selectivity by Quartz Crystal Filter

•

Dual Band Time Signal Receiver WWVB (USA),

JJY (Japan), DCF77 (Germany), MSF (UK), HGB

(Switzerland) and BPC (China)

BLOCK DIAGRAM

AGC Amplifier

Power Supply/Biasing

Demodulator

&

Comparator

RFIM

VDD

VSS PDN1

AGC

DEC

OUT

QI

AON

QO1

QO2

PDN2

RFIP

RFI2