MAS1017 Micro Analog Systems, MAS1017 Datasheet - Page 4

• Manufacturer Part Number: MAS1017
• Description: am Receiver ic
• Manufacturer: Micro Analog Systems

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DataSheet
TYPICAL APPLICATION
Note 1: Ferrite Antenna and Crystal
The crystal as well as ferrite antenna frequencies are chosen according to the time signal system frequency.
DCF-77 transmitter frequency is 77.5 kHz. The ferrite antenna center frequency has to be tuned to 77.5 kHz.
The optimal crystal frequency is 77503 Hz but also 77500 Hz crystal can be used. The shunt capacitance of the
crystal should be as close as possible to internal shunt capacitance compensation capacitor of 0.75 pF for
optimal noise filtering.
Note 2: AGC and DEC Capacitors
The AGC and DEC capacitors should have low leakage currents due to very small 40 nA signal currents through
the capacitors. The insulation resistance of these capacitors should be higher than 70 M . Also probes with at
least 100 M impedance should be used for voltage probing of AGC and DEC pins.
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Ferrite-
An tenna
+1.1V to +3.6V
RFI
VDD
Pow er Supply/Biasing
Q O
AG C Am plifier
77503 Hz
VSS
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PDN
Q I
PUP
470 nF
Dem odulator
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Com parator
AG C
&
DEC
47 nF
DCF
Receiver
29 May, 2002
output
DA1017.002
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