308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
Functional Diagram
LNAOUT
MIXIN+
MIXIN-
MIXOUT IFIN-
IFIN+
10
11
12
13
15
16
IMAGE
REJECTION
IF LIMITING
AMPS
LNAIN
LNASRC
8
9
LNA
0?
Σ
AGND 14
90?
RSSI
4
RSSI
XTAL1
6
DIVIDE-
BY-32
VCO
FSK
FSK
DEMODULATOR
XTAL2
5
PHASE
DETECTOR
LOOP
FILTER
R DF1
100k ?
27 FSEL1
EN 26
R DF2
100k ?
DVDD 24
EXPOSED
PAD*
MAX7042
28 FSEL2
FSK
DATA
DGND 23
FILTER
HVIN 29
3.0V
REG
31 LNASEL
AVDD
7
3.0V
30
DATA
19
DS-
18
PDMAX
17
PDMIN
20
DS+
21
OP+
22
DF
*MUST BE CONNECTED TO AGND.
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9
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