Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX1473ETJ+

AVAILABLE

EVALUATION KIT AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

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.

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.

Applications

Automotive Remote Keyless Entry Security Systems

Garage Door Openers Home Automation

Remote Controls Local Telemetry

Wireless Sensors

Systems

Features

o Optimized for 315MHz or 433MHz ISM Band

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

XTAL

Ratio

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

315MHz/433MHz ASK Superheterodyne

Receiver with Extended Dynamic Range

XTAL2

PWRDN

PDOUT

DATAOUT

DD5

DSP

AGCDIS

DFFB

OPP

DSN

DFO

IFIN2

IFIN1

XTALSEL

DVDD

DGND

MIXOUT

IRSEL

AGND

MIXIN2

MIXIN1

AVDD

LNAOUT

AGND

LNASRC

LNAIN

AVDD

XTAL1

TSSOP

THIN QFN

TOP VIEW

MAX1473

LNASRC

LNAIN

AVDD

XTAL1

XTAL2

PWRDN

PDOUT

25 N.C.

MIXOUT

DGND

DVDD

AGCDIS

N.C.

XTALSEL

IFIN1

16IFIN2

DFO

DSN

OPP

DFFB

N.C.

DSP

DD5

IRSEL

AGND

MIXIN2

MIXIN1

AVDD

LNAOUT

AGND

MAX1473

1N.C.

24 DATAOUT

PART TEMP RANGE PIN-PACKAGE

MAX1473EUI+ -40°C to +85°C 28 TSSOP

MAX1473ETJ+ -40°C to +85°C 32 Thin QFN-EP*

Pin Configurations

Ordering Information

Functional Diagram and Typical Application Circuit appear

at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

MAX1473

19-2748; Rev 6; 1/12

Summary of content (16 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range LE AVAILAB General Description The MAX1473 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitudeshift-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-sensitive applications typical in the automotive and consumer markets.
PAGE 2
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range ABSOLUTE MAXIMUM RATINGS VDD5 to AGND.......................................................-0.3V to +6.0V AVDD to AGND .....................................................-0.3V to +4.0V DVDD to DGND .....................................................-0.3V to +4.0V AGND to DGND.....................................................-0.1V to +0.1V IRSEL, DATAOUT, XTALSEL, AGCDIS, PWRDN to AGND .....................................
PAGE 3
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range DC ELECTRICAL CHARACTERISTICS (5.0V OPERATION) (Typical Application Circuit, VDD = 4.5V to 5.5V, no RF signal applied, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 5.0V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 4.5 5.0 5.5 V fRF = 315MHz 5.2 6.04 fRF = 433MHz 5.7 6.76 fRF = 315MHz 2.3 fRF = 433MHz 2.8 Supply Voltage VDD 5.
PAGE 4
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, VDD = 3.0V to 3.6V, all RF inputs are referenced to 50Ω, fRF = 315MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.
PAGE 5
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, VDD = 3.0V to 3.6V, all RF inputs are referenced to 50Ω, fRF = 315MHz, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.
PAGE 6
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Typical Operating Characteristics (Typical Application Circuit, VDD = 3.3V, fRF = 315MHz, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. RF FREQUENCY +85°C 5.3 +25°C 5.2 5.1 MAX1473 toc02 100 fRF = 433MHz 10 +105°C BIT-ERROR RATE (%) SUPPLY CURRENT (mA) 5.4 6.5 SUPPLY CURRENT (mA) +105°C 5.5 7.0 MAX1473 toc01 5.6 BIT-ERROR RATE vs. AVERAGE RF INPUT POWER MAX1473 toc03 SUPPLY CURRENT vs.
PAGE 7
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Typical Operating Characteristics (continued) (Typical Application Circuit, VDD = 3.3V, fRF = 315MHz, TA = +25°C, unless otherwise noted.) NORMALIZED IF GAIN vs.
PAGE 8
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Pin Description PIN TSSOP TQFN 1 29 8 NAME FUNCTION XTAL1 1st Crystal Input. (See the Phase-Locked Loop section.) Positive Analog Supply Voltage. For +5V operation, pin 2 is the output of an on-chip +3.2V low-dropout regulator and should be bypassed to AGND with a 0.1µF capacitor as close as possible to the pin. Pin 7 must be externally connected to the supply from pin 2 and bypassed to AGND with a 0.
PAGE 9
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Detailed Description The MAX1473 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 MAX1473 is designed to receive binary ASK data modulated in the 300MHz to 450MHz frequency range.
PAGE 10
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Phase-Locked Loop The PLL block contains a phase detector, charge pump/integrated loop filter, VCO, asynchronous 64x clock divider, and crystal oscillator driver. Besides the crystal, this PLL does not require any external components. The VCO generates a low-side local oscillator (LO).
PAGE 11
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range C7 = b a (100k )( π ) ( fc ) C6 = a 4 (100k )( π ) ( fc ) Data Slicer where fC is the desired 3dB corner frequency. For example, choose a Butterworth filter response with a corner frequency of 5kHz: C7 = 1.000 (1.414 )(100kΩ)(3.14 )( 5kHz ) ≈ 450pF Choosing standard capacitor values changes C7 to 470pF and C6 to 220pF, as shown in the Typical Application Circuit.
PAGE 12
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Peak Detector The peak detector output (PDOUT), in conjunction with an external RC filter, creates a DC output voltage equal to the peak value of the data signal. The resistor provides a path for the capacitor to discharge, allowing the peak detector to dynamically follow peak changes of the data filter output voltage. For faster receiver startup, the circuit shown in Figure 4 can be used.
PAGE 13
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Table 2. Component Values for Typical Application Circuit COMPONENT VALUE FOR fRF = 433MHz VALUE FOR fRF = 315MHz DESCRIPTION C1 C2 100pF 2.7pF 100pF 4.7pF 5% ±0.1pF C3 100pF 100pF 5% C4 100pF 100pF 5% C5 C6 1500pF 220pF 1500pF 220pF 10% 5% C7 470pF 470pF 5% C8 0.47µF 0.47µF 20% C9 C10 220pF 0.01µF 220pF 0.01µF 10% 20% C11 0.1µF 0.1µF 20% C12 15pF 15pF Depends on XTAL C13 C14 15pF 0.
PAGE 14
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Typical Application Circuit VDD VDD3 THEN VDD3 IS IF VDD IS (SEE TABLE) 3.0V TO 3.6V CONNECTED TO VDD 4.5V TO 5.
PAGE 15
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Functional Diagram LNASRC 4 LNAIN AVDD VDD5 AVDD DVDD DGND AGND 3 AGCDIS LNAOUT 15 6 MIXIN1 MIXIN2 8 9 Q IMAGE REJECTION 2 24 IFIN1 17 IFIN2 18 0˚ AUTOMATIC GAIN CONTROL LNA MIXOUT 12 IRSEL 11 IF LIMITING AMPS ∑ 90˚ 3.
PAGE 16
MAX1473 315MHz/433MHz ASK Superheterodyne Receiver with Extended Dynamic Range Revision History REVISION NUMBER REVISION DATE 4 5/10 Added lead-free parts and exposed pad in Ordering Information and Pin Description tables 5 1/11 Updated Absolute Maximum Ratings, AC Electrical Characteristics, Pin Description, Layout Considerations, Typical Application Circuit, Functional Diagram, and Package Information; added Voltage Regulator section to the Detailed Description section 6 1/12 Updated DC Electric