MAX1471_11 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – 315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver

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
Wireless Keys
Security Systems
Medical Systems
Home Automation
Local Telemetry Systems
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1471ATJ/V+ -40°C to +125°C 32 Thin QFN-EP**
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
**EP = Exposed pad.
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
1.1µA Deep-Sleep Mode
o Discontinuous Receive (DRX) Low-Power
Management
o Fast-On Startup Feature < 250µs
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
+ ^{32 31 30 29 28 27 26 25}
DSA- 1
DSA+ 2
OPA+ 3
DFA 4
XTAL2 5
XTAL1 6
AVDD 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
________________________________________________________________ Maxim Integrated Products 1
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.