Pin description (continued) – Rainbow Electronics MAX1471 User Manual
Page 8
MAX1471
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
8
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PIN
NAME
FUNCTION
6
XTAL1
1st Crystal Input
7
AV
DD
Analog Power-Supply Voltage for RF Sections. AV
DD
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
18
PDMAXF
Maximum-Level Peak Detector for FSK Data
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
DV
DD
Digital Power-Supply Voltage for Digital Sections. Connect to AV
DD
. 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
HV
IN
High-Voltage Supply Input. For 3V operation, connect HV
IN
to AV
DD
and DV
DD
.
30
ADATA
Digital Baseband ASK Demod Data Output
31
PDMINA
Minimum-Level Peak Detector for ASK Output
32
PDMAXA
Maximum-Level Peak Detector for ASK Output
EP
GND
Exposed Paddle. Connect to ground.
Pin Description (continued)