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DA9079.003

19 May, 2005

MAS9079

AM Receiver IC

• Tri 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 MAS9079 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. MAS9079 supports tri band

operation by switching between three crystal filters

and two additional antenna tuning capacitors.

MAS9079 has asymmetric input and different internal

compensation capacitor options for compensating

shunt capacitances of different crystals (See ordering

information on page 9).

FEATURES

APPLICATIONS

•

Tri Band Receiver IC

•

Highly Sensitive AM Receiver, 0.4

•

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

•

Multi 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

RFI1

RFI2

VDD

VSS PDN1

AGC

DEC

OUT

QO3

QI

AON

QO1

QO2

RFI3

PDN2