The MAX1471 low-power, CMOS, superheterodyne, RF
dual-channel receiver is designed to receive both amplitude-
shift-keyed (ASK) and frequency-shift-keyed (FSK)
data without reconfiguring the device or introducing any
time delay normally associated with changing modulation
schemes. The MAX1471 requires few external components
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 lownoise
amplifier (LNA), an image-reject (IR) mixer, a fully
integrated phase-locked loop (PLL), local oscillator
(LO), 10.7MHz IF limiting amplifier with received-signalstrength
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.
Key Features
Applications/Uses
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
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