MAX7042ATJ+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX7042ATJ+T
308MHz/315MHz/418MHz/433.92MHz Low-Power, FSK Superheterodyne Receiver
General Description
The MAX7042 fully integrated, low-power, CMOS
superheterodyne RF receiver is designed to receive
frequency-shift-keyed (FSK) data at rates up to 66kbps
nonreturn-to-zero (NRZ) (33kbps Manchester). The
MAX7042 requires only a few external components to
realize a complete wireless RF receiver at 308, 315,
418, and 433.92MHz.
The MAX7042 includes all the active components
required in a superheterodyne receiver including a low-
noise amplifier (LNA), an image-rejection (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 regulator. Differential peak-detecting data
demodulators are included for baseband data recovery.
The MAX7042 is available in a 32-pin TQFN and is
specified over the automotive -40°C to +125°C tem-
perature range.
Applications
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
Local Telemetry Systems
Security Systems
Features+2.4V to +3.6V or +4.5V to +5.5V Single-Supply
OperationFour User-Selectable Carrier Frequencies
308, 315, 418, and 433.92MHz-110dBm RF Input Sensitivity at 315MHz-109dBm RFInput Sensitivity at 433.92MHzFast Startup (< 250µs)Small 32-Pin TQFN PackageLow Operating Supply Current
6.2mA Continuous
20nA Power-DownIntegrated PLL, VCO, and Loop Filter45dB Integrated Image RejectionSelectable IF BW with External FilterPositive and Negative Peak DetectorsRSSI Output
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver232221201918
MAX7042
TOP VIEW
N.C.
FSEL1
FSEL2
HVIN
DATA
LNASEL
N.C.
N.C.N.C.N.C.
RSSI
AL2
AL1
LNAIN
DVDDDGNDDFOP+DS+DS-PDMAX
PDMIN
IFIN+
IFIN-
AGND
MIXOUT
MIXIN-
MIXIN+
LNAOUTLNASRC+
Pin Configuration
Ordering Information
19-3704; Rev 2; 1/12
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE
MAX7042ATJ+-40°C TO +125°C32 TQFN-EP*
Typical Application Circuit appears at end of data sheet.
MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, 50Ωsystem impedance, VAVDD= VDVDD= VHVIN= +2.4V to +3.6V, fRF= 308, 315, 418, and
433.92MHz; TA= -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD= VDVDD= VHVIN= +3.0V,
fRF= 433.92MHz, PRFIN≤-80dBm, TA= +25°C, unless otherwise noted.)
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.
HVIN to AGND or DGND.......................................-0.3V to +6.0V
AVDD, DVDD to AGND or DGND..........................-0.3V to +4.0V
FSEL1, FSEL2, LNASEL,
EN, DATA...............................(DGND - 0.3V) to (HVIN + 0.3V)
All Other Pins............................(AGND - 0.3V) to (AVDD + 0.3V)
Continuous Power Dissipation (TA= +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C)..........2759mW
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Maximum RF Input Power................................................+0dBm
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage (3V)VDDHVIN, AVDD, and DVDD connected
to power supply2.43.03.6V
Supply Voltage (5V)HVIN
HVIN connected to power supply,
AVDD and DVDD unconnected from
HVIN, but connected together
4.55.05.5V
Operating, 1x ILNA6.2315M H z ( 3V ) Operating, 2x ILNA6.8
Operating, 1x ILNA6.4315M H z ( 5V ) Operating, 2x ILNA7.0
Operating, 1x ILNA6.48.7434M H z ( 3V ) Operating, 2x ILNA7.08.6
Operating, 1x ILNA6.68.4
Supply CurrentIDD
434M H z ( 5V ) Operating, 2x ILNA7.29.2
TA = +25°C0.02
TA = +85°C0.1Shutdown Current (3V)ISHDNAll digital
inputs low
TA = +125°C0.856
TA = +25°C0.6
TA = +85°C1.4Shutdown Current (5V)ISHDNAll digital
inputs low
TA = +125°C47
Startup TimetON
Time from EN = high to final signal
detection; does not include
baseband filter or data-
slicer reference settling
250µs
DIGITAL I/O
Input High ThresholdVIH0.9 x VHVINV
Input Low ThresholdVIL0.1 x VHVINV
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50Ωsystem impedance, VAVDD= VDVDD= VHVIN= +2.4V to +3.6V, fRF= 308, 315, 418, and
433.92MHz; TA= -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD= VDVDD= VHVIN= +3.0V,
fRF= 433.92MHz, PRFIN≤-80dBm, TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VHVIN = +3.6V815Input High Pulldown CurrentIIHVHVIN = +5.5V2040µA
VHVIN = +3.6V< 11Input Low-Leakage CurrentIILVHVIN = +5.5V< 11µA
Output High VoltageVOHISOURCE = 500µAVHVIN - 0.4V
Output Low VoltageVOLISINK = 500µA0.4V
VOLTAGE REGULATOR
Output VoltageVREG2.53.03.5V
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, 50Ωsystem impedance, VAVDD= VDVDD= VHVIN= +2.4V to +3.6V, fRF= 308, 315, 418, and
433.92MHz; TA= -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD= VDVDD= VHVIN= +3.0V,
fRF= 433.92MHz, PRFIN≤-80dBm, TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Maximum Input Level0dBm
Operating, 1x ILNA-107315MHz
settingOperating, 2x ILNA-110
Operating, 1x ILNA-106Sensitivity (Note 1)
434MHz
settingOperating, 2x ILNA-109
dBm
Receiver Image Rejection45dB
LNA/MIXER
2x ILNA 315MHz0.94 - j3.2Input Impedance (Note 2)ZIN_LNANormalized to
50Ω2x ILNA 433.92MHz0.94 - j2.1
1x ILNA 315MHz-471dB Input Compression PointP1dB2x ILNA 315MHz-52dBm
1x ILNA 315MHz-37Input-Referred 3rd-Order Intercept
PointIIP32x ILNA 315MHz-42dBm
LO Signal Feedthrough to
Antenna-80dBm
Mixer Output ImpedanceZoutMIX330Ω
1x ILNA 315MHz52
2x ILNA 315MHz57
1x ILNA 433.92MHz47Voltage Conversion Gain
330Ω IF filter
load
(Note 3)
2x ILNA 433.92MHz52
IF LIMITING AMPLIFIER
Input ImpedanceZIN_IF330Ω
-3dB Bandwidth10MHz
MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
Note 1:0.2% BER, 4kbps, Manchester coded, 280kHz IF BW, ±50kHz frequency deviation.
Note 2:Input impedance is measured at the LNAIN pin. Note that the impedance at 315MHz includes the 3.9nH inductive degener-
ation from the LNA source to ground. The impedance at 433.92MHz includes a 0nH inductive degeneration connected from
the LNA source to ground. The equivalent input circuit is 47Ωin series with 3.2pF at 315MHz and 47Ωin series with 3.5pF
at 433.92MHz.
Note 3:The voltage conversion gain is measured with the LNA input matching inductor, the degeneration inductor, and the
LNA/mixer resonator in place, and does not include the IF filter insertion loss.
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50Ωsystem impedance, VAVDD= VDVDD= VHVIN= +2.4V to +3.6V, fRF= 308, 315, 418, and
433.92MHz; TA= -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD= VDVDD= VHVIN= +3.0V,
fRF= 433.92MHz, PRFIN≤-80dBm, TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating FrequencyfIF10.7MHz
RSSI Slope101621mV/dB
FSK DEMODULATOR
Conversion Gain1.12.13.0mV/kHz
ANALOG BASEBANDaxi m um P eak- D etector Band w i d th50kHz
Maximum Data-Filter BandwidthBWDF50kHz
Maximum Data-Slicer BandwidthBWDS100kHz
Manchester coded33Maximum Data RateNRZ66kHz
CRYSTAL OSCILLATOR
Crystal FrequencyfXTAL(fRF - 10.7)
/ 32MHz
Crystal Load Capacitance4.5pF
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(1x ILNA)
MAX7042 toc01
SUPPLY CURRENT (mA)
-40°C
+125°C
+85°C
+25°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(2x ILNA)
MAX7042 toc02
SUPPLY CURRENT (mA)
-40°C
+25°C
+125°C
+85°C
SUPPLY CURRENT vs. RF FREQUENCY
(1x ILNA)
MAX7042 toc03
SUPPLY CURRENT (mA)
+125°C
+85°C
+25°C
-40°C
Typical Operating Characteristics
(Typical Application Circuit, VDD= 3.0V, fRF= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, TA= +25°C, unless otherwise noted.)
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
SUPPLY CURRENT vs. RF FREQUENCY
(2x ILNA)
MAX7042 toc04
RF FREQUENCY (MHz)
SUPPLY CURRENT (mA)
+125°C
+85°C
+25°C
-40°C
DEEP-SLEEP CURRENT vs. TEMPERATURE
MAX7042 toc05
TEMPERATURE (°C)
DEEP-SLEEP CURRENT (nA)
VDD = +3.6V
VDD = +3.0V
VDD = +2.4V
BIT-ERROR RATE vs. AVERAGE INPUT POWER
(1x ILNA)
AVERAGE INPUT POWER (dBm)
BIT-ERROR RATE (%)
fRF = 433.92MHz
0.2% BER
fRF = 315MHz
BIT-ERROR RATE vs. AVERAGE INPUT POWER
(2x ILNA)
MAX7042 toc07
AVERAGE INPUT POWER (dBm)
BIT-ERROR RATE (%)
fRF = 433.92MHz
0.2% BER
fRF = 315MHz
SENSITIVITY (dBm)
SENSITIVITY vs. TEMPERATURE
(1x ILNA)
MAX7042 toc08
TEMPERATURE (°C)
fRF = 433.92MHz
fRF = 315MHz
SENSITIVITY (dBm)
SENSITIVITY vs. TEMPERATURE
(2x ILNA)
MAX7042 toc09
TEMPERATURE (°C)
fRF = 433.92MHz
fRF = 315MHz
SENSITIVITY
vs. FREQUENCY DEVIATION
MAX7042 toc10
SENSITIVITY (dBm)
FREQUENCY DEVIATION IS
MEASURED FROM 0 TO PEAK
RSSI AND DELTA
vs. IF INPUT POWER
MAX7042 toc11
RSSI (V)
DELTA (%)
RSSI
DELTA
FSK DEMODULATOR OUTPUT
vs. IF FREQUENCY
MAX7042 toc12
FSK DEMODULATION OUTPUT (V)
Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD= 3.0V, fRF= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, TA= +25°C, unless otherwise noted.)
MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
SYSTEM GAIN vs. IF FREQUENCY
(1x ILNA)
MAX7042 toc13
IF FREQUENCY (MHz)
SYSTEM GAIN (dB)2015105
LOWER SIDEBAND
UPPER SIDEBAND
FROM RFIN
TO MIXOUT
fRF = 433.92MHz45dB IMAGE
REJECTION
SYSTEM GAIN vs. IF FREQUENCY
(2x ILNA)
MAX7042 toc14
IF FREQUENCY (MHz)
SYSTEM GAIN (dB)2015105
LOWER SIDEBAND
UPPER SIDEBAND
FROM RFIN
TO MIXOUT
fRF = 433.92MHz45dB IMAGE
REJECTION
IMAGE REJECTION (dB)
IMAGE REJECTION vs. TEMPERATURE
(1x ILNA)
MAX7042 toc15
TEMPERATURE (°C)
fRF = 433.92MHz
fRF = 315MHz
IMAGE REJECTION (dB)
IMAGE REJECTION vs. TEMPERATURE
(2x ILNA)
MAX7042 toc16
TEMPERATURE (°C)
fRF = 433.92MHz
fRF = 315MHz10100
NORMALIZED IF GAIN
vs. IF FREQUENCY
MAX7042 toc17
IF FREQUENCY (MHz)
NORMALIZED IF GAIN (dB)
S11 vs. RF FREQUENCY
MAX7042 toc18
S11 (dB)
433.92MHzypical Operating Characteristics (continued)
(Typical Application Circuit, VDD= 3.0V, fRF= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, TA= +25°C, unless otherwise noted.)
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
S11 SMITH PLOT OF RFIN
MAX7042 toc19
433.92MHz
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7042 toc20
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
IMAGINARY IMPEDANCE (
fRF = 315MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
INPUT IMPEDANCE
vs. INDUCTIVE DEGENERATION
MAX7042 toc21
INDUCTIVE DEGENERATION (nH)
REAL IMPEDANCE (
IMAGINARY IMPEDANCE (
fRF = 433.92MHz
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
10010k1k100k1M10M
PHASE NOISE
vs. OFFSET FREQUENCY
MAX7042 toc22
OFFSET FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
fRF = 315MHz
fRF = 433.92MHzypical Operating Characteristics (continued)
(Typical Application Circuit, VDD= 3.0V, fRF= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, TA= +25°C, unless otherwise noted.)
MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
Pin Description
PINNAMEFUNCTION
1, 2N.C.No Connection. Internally pulled down.
3, 25, 32N.C.No Connection. Not internally connected.RSSIBuffered Received-Signal-Strength-Indicator OutputXTAL2Crystal Input 2. XTAL2 can be driven from an AC-coupled external reference.XTAL1Crystal Input 1. Bypass to GND if XTAL2 is driven by an AC-coupled external reference.AVDDAnalog Power-Supply Voltage. AVDD is connected to an on-chip +3.0V regulator in +5V operation.
Bypass AVDD to GND with 0.1µF and 220pF capacitors placed as close to the pin as possible.LNAINLow-Noise Amplifier Input. Must be AC-coupled.LNASRCLow-Noise Amplifier Source for External Inductive Degeneration. Connect an inductor to GND to set
the LNA input impedance.LNAOUTLow-Noise Amplifier Output. Connect to VAVDD through a parallel LC tank filter. AC-couple to MIXIN+.MIXIN+Noninverting Mixer Input. Must be AC-coupled to the LNA output.MIXIN-Inverting Mixer Input. Bypass to VAVDD or AGND with a capacitor.MIXOUT330Ω Mixer Output. Connect to the input of the 10.7MHz IF filter.AGNDAnalog GroundIFIN-Inverting 330Ω IF Limiter Amplifier Input. Bypass to AGND with a capacitor.IFIN+Noninverting 330Ω IF Limiter Amplifier Input. Connect to the output of the 10.7MHz IF filter.PDMINMinimum-Level Peak Detector for Demodulator OutputPDMAXMaximum-Level Peak Detector for Demodulator OutputDS-Inverting Data-Slicer InputDS+Noninverting Data-Slicer InputOP+Noninverting Op-Amp Input for the Sallen-Key Data FilterDFData-Filter Feedback Node. Input for the feedback of the Sallen-Key data filter.DGNDDigital GroundDVDDDigital Power-Supply Voltage. Bypass to DGND with 0.01µF and 220pF capacitors placed as close to
the pin as possible.ENEnable. Internally pulled down. Drive high for normal operation. Drive low or leave unconnected to put
the device into shutdown mode.FSEL1Frequency-Select Pin 1 (see Table 1). Internally pulled down. Connect to EN for logic-high operation.FSEL2Frequency-Select Pin 2 (see Table 1). Internally pulled down. Connect to EN for logic-high operation.HVIN
High-Voltage Supply Input. For +3V operation, connect HVIN to AVDD and DVDD. For +5V operation,
connect only HVIN to +5V. Bypass HVIN to AGND with 0.01µF and 220pF capacitors placed as close
to the pin as possible.DATAReceiver Data OutputLNASELLNA Bias Current Select Pin. Internally pulled down. Set LNASEL to logic-low for low LNA current and
set LNASEL to logic-high for high LNA current. Connect to EN for logic-high operation.GNDExposed Pad. Connect to ground.
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
*MUST BE CONNECTED TO AGND.181720212212131516RSSI
LNASEL
FSEL2
FSEL127
LNAOUTMIXIN+MIXIN-
90˚
IFIN-
MIXOUTIFIN+
RSSI
IF LIMITING
AMPS
LNASRC
LNAIN
FSK
DEMODULATOR
FSK
IMAGE
REJECTION
3.0V
RDF1
100kΩ
RDF2
100kΩOP+DS+PDMAXDS-DATAPDMIN
DIVIDE-
BY-32VCO
LOOP
FILTER
PHASE
DETECTOR
YST
OSCILLA
TOR
XTAL1
XTAL2
FSK
DATA
FILTER
AGND
HVIN3.0V
REG
DGND
AVDD
DVDD
EXPOSED
PAD*MAX7042
LNA
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX7042ATJ+T	MAXIM	N/a	1011	avai	308MHz/315MHz/418MHz/433.92MHz Low-Power, FSK Superheterodyne Receiver