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19-3272; Rev 4; 9/11
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
General Description
The MAX1471 low-power, CMOS, superheterodyne, RF
dual-channel receiver is designed to receive both ampli-
tude-shift-keyed (ASK) and frequency-shift-keyed (FSK)
data without reconfiguring the device or introducing any
time delay normally associated with changing modula-
tion schemes. The MAX1471 requires few external com-
ponents to realize a complete wireless RF digital data
receiver for the 300MHz to 450MHz ISM bands.
The MAX1471 includes all the active components
required in a superheterodyne receiver including: a low-
noise amplifier (LNA), an image-reject (IR) mixer, a fully
integrated phase-locked loop (PLL), local oscillator
(LO), 10.7MHz IF limiting amplifier with received-signal-
strength indicator (RSSI), low-noise FM demodulator,
and a 3V voltage regulator. Differential peak-detecting
data demodulators are included for both the FSK and
ASK analog baseband data recovery. The MAX1471
includes a discontinuous receive (DRX) mode for low-
power operation, which is configured through a serial
interface bus.
The MAX1471 is available in a 32-pin thin QFN package
and is specified over the automotive -40°C to +125°C
temperature range.
Applications
Automotive Remote Keyless Entry (RKE)
Tire Pressure Monitoring Systems
Garage Door Openers
Wireless Sensors
Features
o ASK and FSK Demodulated Data on Separate
Outputs
o Specified over Automotive -40°C to +125°C
Temperature Range
o Low Operating Supply Voltage Down to 2.4V
o On-Chip 3V Regulator for 5V Operation
o Low Operating Supply Current
7mA Continuous Receive Mode
1.1 μ A Deep-Sleep Mode
o Discontinuous Receive (DRX) Low-Power
Management
o Fast-On Startup Feature < 250 μ s
o Integrated PLL, VCO, and Loop Filter
o 45dB Integrated Image Rejection
o RF Input Sensitivity*
ASK: -114dBm
FSK: -108dBm
o Selectable IF BW with External Filter
o Programmable Through Serial User Interface
o RSSI Output and High Dynamic Range with AGC
*0.2% BER, 4kbps, Manchester-encoded data, 280kHz IF BW
Pin Configuration
TOP VIEW
Wireless Keys
+
32
31
30
29
28
27
26
25
Security Systems
Medical Systems
Home Automation
Local Telemetry Systems
DSA-
DSA+
OPA+
DFA
1
2
3
4
24
23
22
21
DVDD
DGND
DFF
OPF+
XTAL2
5
MAX1471
20
DSF+
Ordering Information
XTAL1
6
19
DSF-
PART
MAX1471ATJ/V+
TEMP RANGE
-40 ° C to +125 ° C
PIN-PACKAGE
32 Thin QFN-EP**
AVDD
LNAIN
7
8
18
17
PDMAXF
PDMINF
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
9
10
11
12
13
14
15
16
**EP = Exposed pad.
THIN QFN
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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