MAX1471_05 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – 315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver

19-3272; Rev 1; 3/05
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
Wireless Keys
Security Systems
Medical Systems
Home Automation
Local Telemetry Systems
Features
♦ ASK and FSK Demodulated Data on Separate
Outputs
♦ Specified over Automotive -40°C to +125°C
Temperature Range
♦ Low Operating Supply Voltage Down to 2.4V
♦ On-Chip 3V Regulator for 5V Operation
♦ Low Operating Supply Current
7mA Continuous Receive Mode
1.1µA Deep-Sleep Mode
♦ Discontinuous Receive (DRX) Low-Power
Management
♦ Fast-On Startup Feature < 250µs
♦ Integrated PLL, VCO, and Loop Filter
♦ 45dB Integrated Image Rejection
♦ RF Input Sensitivity*
ASK: -114dBm
FSK: -108dBm
♦ Selectable IF BW with External Filter
♦ Programmable Through Serial User Interface
♦ RSSI Output and High Dynamic Range with AGC
*0.2% BER, 4kbps, Manchester-encoded data, 280kHz IF BW
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1471ATJ
-40°C to +125°C 32 Thin QFN-EP**
**EP = Exposed pad.
Pin Configuration
TOP VIEW
32 31 30 29 28 27 26 25
DSA- 1
DSA+ 2
OPA+ 3
DFA 4
XTAL2 5
XTAL1 6
AV_DD 7
LNAIN 8
MAX1471
24 DVDD
23 DGND
22 DFF
21 OPF+
20 DSF+
19 DSF-
18 PDMAXF
17 PDMINF
9 10 11 12 13 14 15 16
THIN QFN
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