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MAX1471 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1471 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 26 page 315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver 8 _______________________________________________________________________________________ PIN NAME FUNCTION 6 XTAL1 1st Crystal Input 7 AVDD Analog Power-Supply Voltage for RF Sections. AVDD is connected to an on-chip +3.0V low-dropout regulator. Decouple to AGND with a 0.1µF capacitor. 8 LNAIN Low-Noise Amplifier Input 9 LNASRC Low-Noise Amplifier Source for External Inductive Degeneration. Connect an inductor to AGND to set LNA input impedance. 10 LNAOUT Low-Noise Amplifier Output. Connect to mixer through an LC tank filter. 11 MIXIN+ Differential Mixer Input. Must be AC-coupled to driving input. 12 MIXIN- Differential Mixer Input. Bypass to AGND with a capacitor. 13 MIXOUT 330 Ω Mixer Output. Connect to the input of the 10.7MHz IF filter. 14 AGND Analog Ground 15 IFIN- Differential 330 Ω IF Limiter Amplifier Input. Bypass to AGND with a capacitor. 16 IFIN+ Differential 330 Ω IF Limiter Amplifier Input. Connect to output of the 10.7MHz IF filter. 17 PDMINF Minimum-Level Peak Detector for FSK Data. Connect to ground if peak detector is not used. See the Peak Detectors section. 18 PDMAXF Maximum-Level Peak Detector for FSK Data. Connect to ground if peak detector is not used. See the Peak Detectors section. 19 DSF- Inverting Data Slicer Input for FSK Data 20 DSF+ Noninverting Data Slicer Input for FSK Data 21 OPF+ Noninverting Op-Amp Input for the FSK Sallen-Key Data Filter 22 DFF Data-Filter Feedback Node. Input for the feedback of the FSK Sallen-Key data filter. 23 DGND Digital Ground 24 DVDD Digital Power-Supply Voltage for Digital Sections. Connect to AVDD. Decouple to DGND with a 10nF capacitor. 25 FDATA Digital Baseband FSK Demodulator Data Output 26 CS Active-Low Chip-Select Input 27 DIO Serial Data Input/Output 28 SCLK Serial Interface Clock Input 29 HVIN High-Voltage Supply Input. For 3V operation, connect HVIN to AVDD and DVDD. 30 ADATA Digital Baseband ASK Demod Data Output 31 PDMINA Minimum-Level Peak Detector for ASK Output. Connect to ground if peak detector is not used. See the Peak Detectors section. 32 PDMAXA Maximum-Level Peak Detector for ASK Output. Connect to ground if peak detector is not used. See the Peak Detectors section. — EP Exposed Pad. Connect to ground. Pin Description (continued) |
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