MAS1017 Просмотр технического описания (PDF) - Micro Analog systems

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Компоненты Описание

производитель

MAS1017

AM Receiver IC

Micro Analog systems 

TYPICAL APPLICATION

77503 Hz

Ferrite-

Antenna RFI

QO

QI

AGC Amplifier

DA1017.002

29 May, 2002

D em o d ulato r

&

C o m p arato r

DCF

Receiver

output

Pow er Supply/Biasing

VDD

VSS

PDN PUP

470 nF

AGC

DEC

47 nF

+1.1V to +3.6V

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 MΩ. Also probes

with at least 100 MΩ impedance should be used for voltage probing of AGC and DEC pins.

4(6)

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