MAS9078BTB1 MAS [Micro Analog systems], MAS9078BTB1 Datasheet - Page 4

• Manufacturer Part Number: MAS9078BTB1
• Description: AM Receiver IC
• Manufacturer: MAS [Micro Analog systems]

TYPICAL APPLICATION
Note 1: Crystal
The crystal as well as ferrite antenna frequencies are chosen according to the time-signal system (Table 1). The
crystal shunt capacitance C
compensation capacitance C
suitable crystals are described in Table 2. See also Ordering Information (p.10).
Time-Signal System
DCF77
MSF
WWVB
JJY
Table 1
Device
MAS9078B1
MAS9078B2
MAS9078B3
MAS9078B4
MAS9078B5
Table 2
Note 2: AGC Capacitor
The AGC and DEC capacitors must 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.
Note 3: Power Down / Fast Startup Control
Both power down and fast startup are controlled using the PDN pin. The device is in power down (turned off) if
PDN = VDD and in power up (turned on) if PDN = VSS. Fast startup is triggered by the falling edge of PDN
signal, i.e., controlling device from power down to power up. The startup time without using the fast startup
control can be several minutes but with fast startup it is shortened typically to 12 s.
1.4 V
Ferrite-
Antenna
RFI
Time-Signal System Frequencies
Compensation Capacitance Options
VDD
Location
Germany
United Kingdom
USA
Japan
C
0.75 pF
1.25 pF
1.625 pF
2.5 pF
3.875 pF
VSS
Power Supply/Biasing
C
QO
AGC Amplifier
C
0
. MAS9078 has five compensation capacitance options. Capacitance values and
should be matched as well as possible with the internal shunt capacitance
Note 1
Note 3
X1
Power Down /
Fast Startup
Control
Crystal Description
For single low C
For single high C
For two parallel low C
For two parallel high C
Any crystal with parallel external compensation capacitor
PDN
QI
Antenna Frequency
77.5 kHz
60 kHz
60 kHz
40 kHz and 60 kHz
Note 2
10 uF
C
0
AGC
0
crystal (Nominal value)
crystal
0
0
crystals (dual band receiver)
Demodulator
Comparator
crystals (dual band receiver)
AGC
AON (=AGC on)
&
DEC
Recommended Crystal Frequency
77.503 kHz
60.003 kHz
60.003 kHz
40.003 kHz and 60.003 kHz
47 nF
C
DEM
OUT
Receiver
output
28 January 2004
DA9078.003
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