DA9178.001
10 Dec, 2003
MAS9178
AM Receiver IC
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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.
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
FEATURES
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Highly Sensitive AM Receiver, 0.4
µV
RMS
typ.
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
APPLICATIONS
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Time Signal Receiver WWVB (USA), JJY (Japan),
DCF77 (Germany) and MSF (UK)
Receiver for ASK Modulated Data Signals
BLOCK DIAGRAM
QOP
RFP
AGC Amplifier
RFM
Demodulator
&
Comparator
OUT
QI
QOM
AON
Power Supply/Biasing
VDD
VSS
PDN
AGC
DEC
1 (8)
MAS [ MICRO ANALOG SYSTEMS ]
