19-2748; Rev 5; 1/11
315MHz/433MHz ASK Superheterodyne
Receiver with Extended Dynamic Range
MAX1473
General Description
Features
o Optimized for 315MHz or 433MHz ISM Band
The MAX1473 fully integrated low-power CMOS super-
heterodyne receiver is ideal for receiving amplitude-
shift-keyed (ASK) data in the 300MHz to 450MHz
frequency range. Its signal range is from -114dBm to
0dBm. With few external components and a low-current
power-down mode, it is ideal for cost- and power-sensi-
tive applications typical in the automotive and consumer
markets. The chip consists of a low-noise amplifier
(LNA), a fully differential image-rejection mixer, an on-
chip phase-locked-loop (PLL) with integrated voltage-
controlled oscillator (VCO), a 10.7MHz IF limiting
amplifier stage with received-signal-strength indicator
(RSSI), and analog baseband data-recovery circuitry.
The MAX1473 also has a discrete one-step automatic
gain control (AGC) that drops the LNA gain by 35dB
when the RF input signal is greater than -57dBm.
o Operates from Single 3.3V or 5.0V Supplies
o High Dynamic Range with On-Chip AGC
o Selectable Image-Rejection Center Frequency
o Selectable x64 or x32 f /f
Ratio
LO XTAL
o Low 5.2mA Operating Supply Current
o < 2.5µA Low-Current Power-Down Mode for
Efficient Power Cycling
o 250µs Startup Time
o Built-In 50dB RF Image Rejection
o Receive Sensitivity of -114dBm
Ordering Information
The MAX1473 is available in 28-pin TSSOP and 32-pin
thin QFN packages. Both versions are specified for the
extended (-40°C to +85°C) temperature range.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 TSSOP
MAX1473EUI+
MAX1473ETJ+
32 Thin QFN-EP*
Applications
Automotive Remote Keyless Entry Security Systems
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Garage Door Openers
Remote Controls
Home Automation
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
Local Telemetry
Systems
Wireless Sensors
Pin Configurations
TOP VIEW
+
XTAL1
AVDD
1
2
3
4
5
6
7
8
9
28 XTAL2
27 PWRDN
26 PDOUT
25 DATAOUT
+
LNAIN
LNASRC
AGND
N.C.
AGND
1
2
3
4
5
6
7
8
24 DATAOUT
23
24
V
DD5
V
DD5
MAX1473
LNAOUT
AVDD
23 DSP
LNAOUT
AVDD
22 DSP
21 N.C.
20 DFFB
19 OPP
18 DSN
17 DFO
22 DFFB
21 OPP
MAX1473
MIXIN1
MIXIN2
MIXIN1
MIXIN2
AGND
20 DSN
AGND 10
IRSEL 11
19 DFO
18 IFIN2
17 IFIN1
16 XTALSEL
15 AGCDIS
IRSEL
MIXOUT 12
DGND 13
DVDD 14
TSSOP
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.