MAS1016B Просмотр технического описания (PDF) - Micro Analog Systems Oy
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MAS1016B Datasheet PDF : 10 Pages
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TYPICAL APPLICATION
Note 1
Ferrite-
Antenna RFI
X1
QO
QI
AGC Amplifier
DA1016B.001
27 January, 2004
AON (=AGC on)
Demodulator
&
Comparator
OUT
Receiver
output
1.4 V
VDD
Power Supply/Biasing
VSS
PDN
AGC
Note 2
CAGC
0.47…1 uF
DEC
CDEM
47 nF
Note 1: Crystal
The crystal as well as ferrite antenna frequencies are chosen according to the time signal system. Ferrite
antenna frequencies and recommended crystal frequencies are presented in table 1. For more details about
crystal selection see DAEV1016B.
Table 1
Time-Signal System Frequencies
Time-Signal System Location
Frequency Recommended Crystal Frequency Unit
DCF77
Germany
77.5
77.503
kHz
MSF
United Kingdom
60
60.003
kHz
WWVB
USA
60
60.003
kHz
JJY
Japan
40 and 60 40.003 and 60.003
kHz
Note 2: AGC Capacitor
The AGC capacitor value is also chosen according to time-signal system. Recommended capacitor values are
presented in table 2. WWVB and JJY systems require external control of AON (=AGC on) pin to receive pulses
correctly. For more details about required control of AON in WWVB and JJY systems see DAEV1016B.
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 MΩ. Also probes
with at least 100 MΩ impedance should be used for voltage probing of AGC and DEC pins.
Table 2
Recommended AGC Capacitor Value
Time-Signal System Recommended AGC Capacitor Value
DCF77
MSF
WWVB
JJY
470nF
1uF
220nF + Special AGC Control
220nF + Special AGC Control
4 (10)
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