Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX7034AUI+

General Description

The MAX7034 fully integrated low-power CMOS super-

heterodyne receiver is ideal for receiving amplitude-

shift-keyed (ASK) data in the 300MHz to 450MHz

frequency range (including the popular 315MHz and

433.92MHz frequencies). The receiver has an RF sensi-

tivity of -114dBm. With few external components and a

low-current power-down mode, it is ideal for cost-sensi-

tive and power-sensitive applications typical in the

automotive and consumer markets. The MAX7034 con-

sists 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 MAX7034 is available in a 28-pin (9.7mm x 4.4mm)

TSSOP package and is specified over the automotive

(-40°C to +125°C) temperature range.

Features

♦ Optimized for 315MHz or 433.92MHz Band

♦ Operates from Single +5.0V Supply

♦ Selectable Image-Rejection Center Frequency

♦ Selectable x64 or x32 f

XTAL

Ratio

♦ Low (< 6.7mA) Operating Supply Current

♦ < 3.0µA Low-Current Power-Down Mode for

Efficient Power Cycling

♦ 250µs Startup Time

♦ Built-In 44dB RF Image Rejection

♦ Excellent Receive Sensitivity Over Temperature

♦ -40°C to +125°C Operation

MAX7034

315MHz/434MHz ASK Superheterodyne

Receiver

XTAL2

SHDN

PDOUT

DATAOUT

DSP

EN_REG

DFFB

OPP

DSN

DFO

IFIN2

IFIN1

XTALSEL

DVDD

DGND

MIXOUT

IRSEL

AGND

MIXIN2

MIXIN1

AVDD

LNAOUT

AGND

LNASRC

LNAIN

AVDD

DD5

XTAL1

TSSOP

TOP VIEW

MAX7034

Pin Configuration

Ordering Information

Applications

19-3109; Rev 3; 6/12

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.

/V denotes an automotive qualified part.

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

T = Tape and reel.

Typical Application Circuit appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX7034AUI/V+T -40°C to +125°C 28 TSSOP

Automotive Remote

Keyless Entry

Security Systems

Garage Door Openers

Home Automation

Remote Controls

Local Telemetry

Wireless Sensors

Summary of content (14 pages)

PAGE 1
9-3109; Rev 3; 6/12 315MHz/434MHz ASK Superheterodyne Receiver The MAX7034 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitudeshift-keyed (ASK) data in the 300MHz to 450MHz frequency range (including the popular 315MHz and 433.92MHz frequencies). The receiver has an RF sensitivity of -114dBm. With few external components and a low-current power-down mode, it is ideal for cost-sensitive and power-sensitive applications typical in the automotive and consumer markets.
PAGE 2
MAX7034 315MHz/434MHz ASK Superheterodyne Receiver 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, SHDN, EN_REG to AGND ....................-0.3V to (VDD5 + 0.
PAGE 3
15MHz/434MHz ASK Superheterodyne Receiver (Typical Application Circuit, VDD5 = +4.5V to +5.5V, all RF inputs are referenced to 50Ω, fRF = 433.92MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD5 = +5.0V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL CHARACTERISTICS Startup Time tON Receiver Input Frequency Range fRF Time for valid signal detection after VSHDN = VDD5. Does not include baseband filter settling.
PAGE 4
MAX7034 315MHz/434MHz ASK Superheterodyne Receiver AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, VDD5 = +4.5V to +5.5V, all RF inputs are referenced to 50Ω, fRF = 433.92MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD5 = +5.0V and TA = +25°C.
PAGE 5
315MHz/434MHz ASK Superheterodyne Receiver MAX7034 Typical Operating Characteristics (Typical Application Circuit, VDD5 = +5.0V, fRF = 433.92MHz, TA = +25°C, unless otherwise noted.) +85°C 7.2 7.0 +25°C +105°C +125°C -40°C 6.8 8.0 MAX7034 toc02 +125°C 433.92MHz 10.00 7.5 7.0 6.5 +25°C 6.0 5.5 6.6 4.9 5.1 5.3 SUPPLY VOLTAGE (V) 5.5 0.01 250 SENSITIVITY vs. TEMPERATURE -104 -106 350 400 450 RF FREQUENCY (MHz) -130 500 2.
PAGE 6
Typical Operating Characteristics (continued) (Typical Application Circuit, VDD5 = +5.0V, fRF = 433.92MHz, TA = +25°C, unless otherwise noted.) NORMALIZED IF GAIN vs. IF FREQUENCY S11 MAGNITUDE PLOT OF RFIN vs. FREQUENCY 40 30 S11 MAGNITUDE (dB) -5 -10 -15 -20 MAX7034 toc12 MAX7034 toc11 0 S11 SMITH CHART PLOT OF RFIN 50 MAX7034 toc10 5 NORMALIZED IF GAIN (dB) 500MHz WITH INPUT MATCHING 20 10 0 315MHz -10 200MHz 315MHz -24.
PAGE 7
315MHz/434MHz ASK Superheterodyne Receiver PIN NAME FUNCTION 4 LNASRC 5, 10 AGND 6 LNAOUT 8 MIXIN1 1st Differential Mixer Input. Connect to LC tank filter from LNAOUT through a 100pF capacitor. See the Typical Application Circuit. 9 MIXIN2 2nd Differential Mixer Input. Connect to VDD3 side of the LC tank filter through a 100pF capacitor. See the Typical Application Circuit. 11 IRSEL Image-Rejection Select. Set VIRSEL = 0V to center image rejection at 315MHz.
PAGE 8
315MHz/434MHz ASK Superheterodyne Receiver MAX7034 Functional Diagram LNASRC 4 LNAIN AVDD VDD5 AVDD DVDD DGND AGND 3 EN_REG LNAOUT 15 6 MIXIN1 MIXIN2 8 9 7 14 13 5, 10 Q IFIN2 18 IMAGE REJECTION ∑ I DIVIDE BY 64 VCO PHASE DETECTOR LOOP FILTER ÷1 IF LIMITING AMPS 90˚ 3.
PAGE 9
315MHz/434MHz ASK Superheterodyne Receiver Mixer A unique feature of the MAX7034 is the integrated image rejection of the mixer. This device eliminates the need for a costly front-end SAW filter for most applications. Advantages of not using a SAW filter are increased sensitivity, simplified antenna matching, less board space, and lower cost. The mixer cell is a pair of double balanced mixers that perform an IQ downconversion of the RF input to the 10.7MHz IF from a low-side injected LO (i.e.
PAGE 10
MAX7034 315MHz/434MHz ASK Superheterodyne Receiver It is possible to use an external reference oscillator in place of a crystal to drive the VCO. AC-couple the external oscillator to XTAL2 with a 1000pF capacitor. Drive XTAL2 with a signal level of approximately 500mVP-P. AC-couple XTAL1 to ground with a 1000pF capacitor. Data Filter The data filter is implemented as a 2nd-order lowpass Sallen-Key filter. The pole locations are set by the combination of two on-chip resistors and two external capacitors.
PAGE 11
315MHz/434MHz ASK Superheterodyne Receiver MAX7034 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 data slicer response, use the circuit shown in Figure 4.
PAGE 12
315MHz/434MHz ASK Superheterodyne Receiver MAX7034 Typical Application Circuit IF VDD IS THEN VDD3 IS AND EN_REG IS 3.0V TO 3.6V CONNECTED TO VDD GROUNDED 4.5V TO 5.
PAGE 13
315MHz/434MHz ASK Superheterodyne Receiver MAX7034 Table 2. Component Values for Typical Application Circuit COMPONENT VALUE FOR fRF = 433MHz VALUE FOR fRF = 315MHz DESCRIPTION C1 100pF 100pF 5% C2 Open Open ±0.1pF C3 100pF 100pF 5% C4 100pF 100pF 5% C5 1500pF 1500pF 10% C6 220pF 220pF 5% C7 470pF 470pF 5% C8 0.47μF 0.47μF 20% C9 220pF 220pF 10% C10 0.01μF 0.01μF 20% C11 0.1μF 0.1μF 20% C12 100pF 100pF 5% C13 100pF 100pF 5% C14 0.01μF 0.
PAGE 14
MAX7034 315MHz/434MHz ASK Superheterodyne Receiver Revision History REVISION REVISION NUMBER DATE DESCRIPTION PAGES CHANGED 0 1/08 Initial release — 1 3/09 Added /V designation to part number.