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MAX1471ATJ+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
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
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
MAX1471
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
________________________________________________________________
Maxim Integrated Products
1
32
+
31 30 29 28 27 26
9 101112131415
18
19
20
21
22
23
24
7
6
5
4
3
2
1
MAX1471
THIN QFN
TOP VIEW
DSA+
DSA-
OPA+
DFA
XTAL2
XTAL1
AVDD
8
LNAIN
PDMAXA
PDMINA
ADATA
HVIN
SCLK
DIO
25
FDATA
DVDD
DGND
DFF
OPF+
DSF+
DSF-
PDMAXF
17
PDMINF
IFIN-
AGND
16
IFIN+
MIXOUT
MIXIN-
MIXIN+
LNAOUT
LNASRC
CS
Pin Configuration
19-3272; Rev 4; 9/11
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.
*
0.2% BER, 4kbps, Manchester-encoded data, 280kHz IF BW
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.
MAX1471
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
High-Voltage Supply, HVIN to DGND ......................-0.3V, +6.0V
Low-Voltage Supply, AVDD and DVDD to AGND ....-0.3V, +4.0V
SCLK, DIO, CS, ADATA,
FDATA ...................................(DGND - 0.3V) to (HVIN + 0.3V)
All Other Pins............................(AGND - 0.3V) to (AVDD + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ...1702mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Soldering Temperature (reflow) ...................................... +260°C
DC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, V
AVDD
= V
DVDD
= V
HVIN
= +2.4V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at V
AVDD
= V
DVDD
= V
HVIN
= +3.0V, f
RF
= 434 MHz, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL CHARACTERISTICS
Supply Voltage (5V) HVIN
AVDD and DVDD unconnected from HVIN,
but connected together
4.5 5.0 5.5 V
Supply Voltage (3V) V
DD
HVIN, AVDD, and DVDD connected to
power supply
2.4 3.0 3.6 V
Operating 7.0 8.4 mA
Polling duty cycle: 10%
duty cycle
705 855
DRX mode OFF current 5.0 14.2
T
A
< +85°C
Deep-sleep current 1.1 7.1
µA
Operating 8.5 mA
Polling duty cycle: 10%
duty cycle
865
DRX mode OFF current 15.5
T
A
< +105°C
(Note 2)
Deep-sleep current 13.4
µA
Operating 8.6 mA
Polling duty cycle: 10%
duty cycle
900
DRX mode OFF current 44.1
Supply Current I
DD
T
A
< +125°C
(Note 2)
Deep-sleep current 36.4
µA
Startup Time t
ON
Time for final signal detection, does not
include baseband filter settling (Note 2)
200 250 µs
DIGITAL OUTPUTS (DIO, ADATA, FDATA)
Output High Voltage V
OH
I
SOURCE
= 250µA (Note 2)
V
HVIN
-
0.15
V
Output Low Voltage V
OL
I
SINK
= 250µA (Note 2) 0.15 V
DIGITAL INPUTS (CS, DIO, SCLK)
Input High Threshold V
IH
0.9 x
V
HVIN
V
Input Low Threshold V
IL
.
0.1 x
V
HVIN
V
MAX1471
315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, V
AVDD
= V
DVDD
= V
HVIN
= +2.4V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at V
AVDD
= V
DVDD
= V
HVIN
= +3.0V, f
RF
= 434 MHz, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input-High Leakage Current I
IH
(Note 2) -20 µA
Input-Low Leakage Current I
IL
(Note 2) 20 µA
Input Capacitance C
IN
(Note 2) 2.0 pF
VOLTAGE REGULATOR
Output Voltage V
REG
V
HVIN
= 5.0V, I
LOAD
= 7.0mA 3.0 V
AC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, V
AVDD
= V
DVDD
= V
HVIN
= +2.4V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at V
AVDD
= V
DVDD
= V
HVIN
= +3.0V, f
RF
= 434 MHz, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
GENERAL CHARACTERISTICS
ASK
-114
Receiver Sensitivity RF
IN
0.2% BER, 4kbps
Manchester Code, 280kHz
IF BW, 50Ω
FSK
-108
dBm
Maximum Receiver Input Power
Level
RF
MAX
0
dBm
Receiver Input Frequency Range
f
RF
300
450
MHz
Receiver Image Rejection IR (Note 3) 45 dB
LNA/MIXER (Note 4)
f
RF
= 315MHz 1 - j4.7
LNA Input Impedance
Z
IN_LNA
Normalized to 50Ω
f
RF
= 434MHz 1 - j3.4
Voltage Conversion Gain (High-
Gain Mode)
47.5
dB
Input-Referred 3rd-Order
Intercept Point (High-Gain Mode)
-38
dBm
Voltage Conversion Gain (Low-
Gain Mode)
12.2
dB
Input-Referred 3rd-Order
Intercept Point (Low-Gain Mode)
-5
dBm
LO Signal Feedthrough to
Antenna
-90
dBm
Mixer Output Impedance
Z
OUT_MIX
330
Ω
IF
Input Impedance Z
IN_IF
330
Ω
Operating Frequency f
IF
10.7
MHz
3dB Bandwidth 10
MHz
FM DEMODULATOR
Demodulator Gain G
FM
2.2
mV/kHz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MAX1471ATJ+T

Mfr. #:
Buy MAX1471ATJ+T
Manufacturer:
Maxim Integrated
Description:
RF Receiver 315MHz/434MHz Superheterodyne Rcvr
Lifecycle:
New from this manufacturer.
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