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MAX1470EUI
315MHz Low-Power / +3V Superheterodyne Receiver
General DescriptionThe MAX1470 is a fully integrated low-power CMOS
superheterodyne receiver for use with amplitude-shift-
keyed (ASK) data in the 315MHz band. With few
required external components, and a low-current
power-down mode, it is ideal for cost- and power-sensi-
tive applications in the automotive and consumer mar-
kets. The chip consists of a 315MHz low-noise amplifier
(LNA), an image rejection mixer, a fully integrated
315MHz phase-lock-loop (PLL), a 10.7MHz IF limiting
amplifier stage with received-signal-strength indicator
(RSSI) and an ASK demodulator, and analog baseband
data-recovery circuitry.
The MAX1470 is available in a 28-pin TSSOP package.
ApplicationsRemote Keyless Entry
Garage Door Openers
Remote Controls
Wireless Sensors
Wireless Computer Peripherals
Security Systems
Toys
Video Game Controllers
Medical Systems
FeaturesOperates from a Single +3.0V to +3.6V SupplyBuilt-In 53dB RF Image Rejection-115dBm Receive Sensitivity*250µs Startup TimeLow 5.5mA Operating Supply Current1.25µA Low-Current Power-Down Mode for
Efficient Power Cycling250MHz to 500MHz Operating Band (Image
Rejection Optimized at 315MHz)Integrated PLL with On-Board Voltage-Controlled
Oscillator (VCO) and Loop FilterSelectable IF Bandwidth Through External FilterComplete Receive System from RF to Digital Data
Out
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
Ordering Information19-2135; Rev 1; 8/02
Functional Diagram
Typical Application Circuit appears at end of data sheet.
Pin Configuration appears at end of data sheet.*See Note 2, AC Electrical Characteristics.
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(Typical Application Circuit, VDD= +3.0V to +3.6V, no RF signal applied, TA= -40°C to +85°C. Typical values are at VDD= +3.3V, TA
AC ELECTRICAL CHARACTERISTICS(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD= +3.3V, TA= +25°C, fRFIN= 315MHz, unless oth-
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.
AVDDto AGND......................................................-0.3V to +4.0V
DVDDto DGND......................................................-0.3V to +4.0V
All Other Pins Referenced to AGND...........-0.3V to (VDD+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
28-Pin TSSOP (derate 13mW/°C above +70°C).........1039mW
Operating Temperature Range
MAX1470EUI...................................................-40°C to +85°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
AC ELECTRICAL CHARACTERISTICS (continued)(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD= +3.3V, TA= +25°C, fRFIN= 315MHz, unless oth-
erwise noted.) (Note 1)
Note 1:Parts are production tested at TA= +25°C; Min and Max values are guaranteed by design and characterization.
Note 2:BER = 2E-3, Manchester encoded, data rate = 4kbps, IF bandwidth = 350kHz.
Note 3:Input impedance is measured at the LNAIN pin. Note that the impedance includes the 15nH inductive degeneration con-
nected from the LNASRC.
Note 4:Guaranteed by production test.
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
Typical Operating Characteristics(VDD= +3.3V, TA= +25°C, unless otherwise noted. Typical Application Circuit.)
MAX1470
315MHz Low-Power, +3V Superheterodyne
ReceiverNORMALIZED IF GAIN
vs. IF FREQUENCY
MAX1470 toc10
IF FREQUENCY (MHz)
NORMALIZED IF GAIN (dB)10100
IMAGE REJECTION
vs. RF FREQUENCYMAX1470 toc11
RF FREQUENCY (MHz)
IMAGE REJECTION (dB)
S11 MAGNITUDE-LOG PLOT OF RFIN
MAX1470toc12
1GHz50MHz
10dB/
div
0dB
S11 SMITH PLOT OF RFINMAX1470 toc13
ypical Operating Characteristics (continued)(VDD= +3.3V, TA= +25°C, unless otherwise noted. Typical Application Circuit.)
MAX1470
Detailed DescriptionThe MAX1470 CMOS superheterodyne receiver and a
few external components provide the complete receive
chain from the antenna to the digital output data.
Depending on signal power and component selection,
data rates as high as 100kbps can be achieved.
The MAX1470 is designed to receive binary ASK data
on a 315MHz carrier. ASK modulation uses a difference
in amplitude of the carrier to represent logic 0 and logic
1 data.
Low-Noise Amplifier The LNA is a cascode amplifier with off-chip inductive
degeneration that achieves approximately 16dB of
power gain with a 2.0dB noise figure and an IIP3 of
-18dBm. The gain and noise figure is dependent on
both the antenna matching network at the LNA input,
and the LC tank network between the LNA output and
the mixer inputs.
The off-chip inductive degeneration is achieved by con-
necting an inductor from LNASRC to AGND. This inductor
sets the real part of the input impedance at LNAIN, allow-
ing for a more flexible match for low-input impedance
such as a PC board trace antenna. A nominal value for
this inductor with a 50Ωinput impedance is 15nH, but is
affected by PC board trace. See Typical Operating
Characteristicsfor the relationship between the induc-
tance and input impedance.
The LC tank filter connected to LNAOUT comprises L1
and C9 (see Typical Applications Circuit). L1 and C9 val-
ues are selected to resonate at the RF input frequency of
315MHz. The resonant frequency is given by:
315MHz Low-Power, +3V Superheterodyne
Receiver
