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