DA9081.006
1 August, 2005
MAS9081
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Dual Band Receiver IC
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High Sensitivity
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Very Low Power Consumption
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Wide Supply Voltage Range
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Power Down Control
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Control for AGC On
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High Selectivity by Crystal Filter
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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
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Dual Band Receiver IC
Highly Sensitive AM Receiver, 0.4
µV
RMS
typ.
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
APPLICATIONS
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Dual Band Time Signal Receiver WWVB (USA),
JJY (Japan), DCF77 (Germany), MSF (UK), HGB
(Switzerland) and BPC (China)
BLOCK DIAGRAM
QO2
RFIP
RFIM
AGC Amplifier
Demodulator
&
Comparator
OUT
QO1
QI
AON
RFI2
Power Supply/Biasing
VDD
VSS PDN1 PDN2
AGC
DEC
1 (12)
MAS [ MICRO ANALOG SYSTEMS ]
