MAX1473 Datasheet, PDF (8/17 Pages) Maxim Integrated Products – 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range

315MHz/433MHz ASK Superheterodyne
Receiver with Extended Dynamic Range
Pin Description
PIN
TSSOP QFN
1
29
2, 7
4, 30
3
31
4
32
5
2
6
3
8
5
9
6
10
7
11
8
12
9
13
10
14
11
15
12
16
14
17
15
18
16
19
17
20
18
21
19
22
20
23
22
24
23
25
24
26
26
27
27
28
28
—
1, 13,
21, 25
NAME
FUNCTION
XTAL1
AV_DD
LNAIN
1st Crystal Input. (See Phase-Locked Loop section.)
Positive Analog Supply Voltage for RF Sections. (See Typical Application Circuit.)
Low-Noise Amplifier Input. (See Low-Noise Amplifier section.)
LNASRC
AGND
Low-Noise Amplifier Source for External Inductive Degeneration. Connect inductor to ground to
set LNA input impedance. (See Low-Noise Amplifier section.)
Analog Ground
LNAOUT
Low-Noise Amplifier Output. Connect to mixer through an LC tank filter. (See Low-Noise
Amplifier section.)
MIXIN1
MIXIN2
AGND
1st Differential Mixer Input. Connect through a 100pF capacitor to V_DD side of the LC tank.
2nd Differential Mixer Input. Connect through a 100pF capacitor to LC tank filter from LNAOUT.
Analog Ground
IRSEL
Image Rejection Select Pin. Set V_IRSEL = 0V to center image rejection at 315MHz. Leave IRSEL
floating to center image rejection at 375MHz. Set V_IRSEL = V_DD to center image rejection at
433MHz.
MIXOUT
DGND
DV_DD
AGCDIS
330Ω Mixer Output. Connect to the input of the 10.7MHz bandpass filter.
Digital Ground
Positive Digital Supply Voltage. Decouple to DGND with a 0.01µF capacitor.
AGC Control Pin. Pull high to disable AGC.
XTALSEL
Crystal Divider Ratio Select Pin. Drive XTALSEL low to select divider ratio of 64, or drive
XTALSEL high to select divider ratio of 32.
IFIN1
1st Differential Intermediate Frequency Limiter Amplifier Input. Decouple to AGND with a 1500pF
capacitor.
IFIN2
2nd Differential Intermediate Frequency Limiter Amplifier Input. Connect to the output of a
10.7MHz bandpass filter.
DFO Data Filter Output
DSN Negative Data Slicer Input
OPP Noninverting Op-Amp Input for the Sallen-Key Data Filter
DFFB Data Filter Feedback Node. Input for the feedback of the Sallen-Key data filter.
DSP Positive Data Slicer Input
V_DD5 5V Supply Voltage. V_DD5 is shorted to AV_DD for 3.3V operation.
DATAOUT Digital Baseband Data Output
PDOUT Peak Detector Output
PWRDN Power-Down Select Input. Drive this pin with a logic high to power on the IC.
XTAL2 2nd Crystal Input
N.C. No Connection
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