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MAS9078BTC3 Datasheet(PDF) 4 Page - Micro Analog systems |
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MAS9078BTC3 Datasheet(HTML) 4 Page - Micro Analog systems |
4 / 10 page DA9078.003 28 January 2004 4 (10) 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 C0 should be matched as well as possible with the internal shunt capacitance compensation capacitance CC. MAS9078 has five compensation capacitance options. Capacitance values and suitable crystals are described in Table 2. See also Ordering Information (p.10). Time-Signal System Location Antenna Frequency Recommended Crystal Frequency DCF77 Germany 77.5 kHz 77.503 kHz MSF United Kingdom 60 kHz 60.003 kHz WWVB USA 60 kHz 60.003 kHz JJY Japan 40 kHz and 60 kHz 40.003 kHz and 60.003 kHz Table 1 Time-Signal System Frequencies Device CC Crystal Description MAS9078B1 0.75 pF For single low C0 crystal (Nominal value) MAS9078B2 1.25 pF For single high C0 crystal MAS9078B3 1.625 pF For two parallel low C0 crystals (dual band receiver) MAS9078B4 2.5 pF For two parallel high C0 crystals (dual band receiver) MAS9078B5 3.875 pF Any crystal with parallel external compensation capacitor Table 2 Compensation Capacitance Options 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 M Ω. Also probes with at least 100 M Ω 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. AGC Amplifier Demodulator & Comparator Power Supply/Biasing RFI OUT QI QO VSS AGC DEC Receiver output Ferrite- Antenna Note 1 AON (=AGC on) VDD 1.4 V PDN Note 2 X1 CAGC 10 uF CDEM 47 nF Note 3 Power Down / Fast Startup Control |
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