MAX1471_11 Datasheet, PDF (8/26 Pages) Maxim Integrated Products – 315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver

315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
Pin Description (continued)
PIN
NAME
6
XTAL1 1st Crystal Input
FUNCTION
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 330Ω Mixer Output. Connect to the input of the 10.7MHz IF filter.
14
AGND Analog Ground
15
IFIN-
Differential 330Ω IF Limiter Amplifier Input. Bypass to AGND with a capacitor.
16
IFIN+ Differential 330Ω 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.
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