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DA9178.001

10 Dec, 2003

MAS9178

AM 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 MAS9178 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 receiver.

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. Unlike MAS1016A and

MAS1016B, MAS9178 does not require AGC control

procedure in WWVB and JJY systems.

MAS9178A1 has differential input and internal 0.875

pF

compensation

capacitor

for

crystal

shunt

capacitance compensation.

MAS9178A5

requires

external

compensation

capacitor

for

crystal

shunt

capacitance

compensation.

It can be used with crystals that do not match with

fixed 0.875 pF compensation capacitance of

MAS9178A1.

FEATURES

APPLICATIONS

•

Highly Sensitive AM Receiver, 0.4

•

Wide Supply Voltage Range from 1.1 V to 3.6 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

•

Time Signal Receiver WWVB (USA), JJY (Japan),

DCF77 (Germany) and MSF (UK)

•

Receiver for ASK Modulated Data Signals

BLOCK DIAGRAM

AGC Amplifier

Power Supply/Biasing

Demodulator

&

Comparator

RFP

RFM

VDD

VSS

PDN

AGC

DEC

OUT

QOP

QI

QOM

AON