Rainbow Electronics MAX7042 - Manual (Page 9)

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