Rainbow Electronics MAX7033 User Manual
General Description
The MAX7033 fully integrated low-power CMOS superheterodyne receiver is ideal for receiving amplitudeshift-keyed (ASK) data in the 300MHz to 450MHz
frequency range. The receiver has an RF input signal
range of -114dBm to 0dBm. 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. The
MAX7033 consists of a low-noise amplifier (LNA), a fully
differential image-rejection mixer, an on-chip phaselocked 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 MAX7033
also has a discrete one-step automatic gain control
(AGC) that reduces the LNA gain by 35dB when the RF
input signal exceeds -62dBm. The AGC circuitry offers
an externally controlled hold feature.
The MAX7033 is available in a 28-pin TSSOP package
and is specified over the extended (-40°C to +105°C)
temperature range.
Features
♦ Optimized for 315MHz or 433MHz Band
♦ Operates from Single +3.3V or +5.0V Supplies
♦ High Dynamic Range with On-Chip AGC
♦ AGC Hold Circuit
♦ 1ms AGC Release Time
♦ Selectable Image-Rejection Center Frequency
♦ Selectable x64 or x32 fLO/f
XTAL
Ratio
♦ Low 5.2mA Operating Supply Current
♦ <3.5µA Low-Current Power-Down Mode for
Efficient Power Cycling
♦ 250µs Startup Time
♦ Built-In 44dB RF Image Rejection
♦ Better than -114dBm Receive Sensitivity
♦ -40°C to +105°C Operation
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
________________________________________________________________ Maxim Integrated Products 1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
XTAL2
SHDN
PDOUT
DATAOUT
V
DD5
DSP
AC
DFFB
OPP
DSN
DFO
IFIN2
IFIN1
XTALSEL
DV
DD
DGND
MIXOUT
IRSEL
AGND
MIXIN2
MIXIN1
AV
DD
LNAOUT
AGND
LNASRC
LNAIN
AV
DD
XTAL1
TSSOP
THIN QFN
TOP VIEW
MAX7033
32
313029
282726
LNASRC
LNAIN
AV
DD
XTAL1
XTAL2
SHDN
PDOUT
25 N.C.
9
101112
131415
MIXOUT
DGND
DV
DD
AC
N.C.
XTALSEL
IFIN1
16IFIN2
17
18
19
20
21
22
23
DFO
DSN
OPP
DFFB
N.C.
DSP
V
DD5
8
7
6
5
4
3
2
IRSEL
AGND
MIXIN2
MIXIN1
AV
DD
LNAOUT
AGND
MAX7033
1N.C.
24 DATAOUT
Pin Configurations
Ordering Information
Applications
19-3273; Rev 0; 5/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*Future product—contact factory for availability.
**EP = Exposed paddle.
Typical Application Circuit appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX7033EUI -40°C to +105°C 28 TSSOP
MAX7033ETJ* -40°C to +105°C 32 Thin QFN-EP**
Automotive Remote
Keyless Entry
Security Systems
Garage Door Openers
Home Automation
Remote Controls
Local Telemetry
Wireless Sensors
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS (+3.3V OPERATION)
(Typical Application Circuit, AVDD= DVDD= V
DD5
= +3.0V to +3.6V, no RF signal applied, TA= -40°C to +105°C, unless otherwise
noted. Typical values are at AV
DD
= DVDD= V
DD5
= +3.3V and TA= +25°C.) (Note 1)
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.
V
DD5
to AGND.......................................................-0.3V to +6.0V
AV
DD
to AGND......................................................-0.3V to +4.0V
DV
DD
to DGND......................................................-0.3V to +4.0V
AGND to DGND.....................................................-0.1V to +0.1V
IRSEL, DATAOUT, XTALSEL,
AC,
SHDN to AGND.............................-0.3V to (V
DD5
+ 0.3V)
All Other Pins to AGND............................-0.3V to (DV
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP (derate 12.8mW/°C above +70°C) ..1025.6mW
32-Thin QFN (derate 21.3mW/°C above +70°C) ....1702.1mW
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering 10s)..................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
AV
DD
,
DV
DD
+3.3V nominal supply voltage 3.0 3.3 3.6 V
fRF = 315MHz 5.2
Supply Current I
DD
V
SHDN
= DV
DD
fRF = 433MHz 5.7
mA
fRF = 315MHz 2.6
Shutdown Supply Current I
SHDN
V
SHDN
= 0V,
V
XTALSEL
= 0V
f
RF
= 433MHz 3.5 8.0
µA
Input-Voltage Low V
IL
0.4 V
Input-Voltage High V
IH
DVDD -
0.4
V
Input Logic Current High I
IH
10 µA
fRF = 433MHz, V
IRSEL
= V
DD5
V
DD5
-
0.4
fRF = 375MHz, V
IRSEL
= V
DD5
/ 2 1.1
V
DD5
-
1.0
Image-Reject Select Voltage
(Note 2)
f
RF
= 315MHz, V
IRSEL
= 0V 0.4
V
DATAOUT Output-Voltage Low V
OL
I
SINK
= 10µA
V
DATAOUT Output-Voltage High V
OH
I
SOURCE
= 10µA
DV
DD
V
DC ELECTRICAL CHARACTERISTICS (+5.0V OPERATION)
(Typical Application Circuit, V
DD5
= +4.5V to +5.5V, no RF signal applied, TA= -40°C to +105°C, unless otherwise noted. Typical val-
ues are at V
DD5
= +5.0V and TA= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Supply Voltage V
DD5
+5.0V nominal supply voltage 4.5 5.0 5.5 V
fRF = 315MHz 5.2 6.4
Supply Current I
DD
V
SHDN
= V
DD5
fRF = 433MHz 5.7
mA
fRF = 315MHz 3.7
Shutdown Supply Current I
SHDN
V
SHDN
= 0V,
V
XTALSEL
= 0V
f
RF
= 433MHz 4.2 9.8
µA
Input-Voltage Low V
IL
0.4 V
6.23
6.88
0.125
SYMBOL
MIN TYP MAX
0.125
6.76
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (+5.0V OPERATION) (continued)
(Typical Application Circuit, V
DD5
= +4.5V to +5.5V, no RF signal applied, TA= -40°C to +105°C, unless otherwise noted. Typical val-
ues are at V
DD5
= +5.0V and TA= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Input-Voltage High V
IH
V
DD5
-
0.4
V
Input Logic Current High I
IH
15 µA
fRF = 433MHz, V
IRSEL
= V
DD5
V
DD5
-
0.4
fRF = 375MHz, V
IRSEL
= V
DD5
/ 2 1.1
V
DD5
-
1.5
Image-Reject Select Voltage
(Note 2)
f
RF
= 315MHz, V
IRSEL
= 0V 0.4
V
DATAOUT Output-Voltage Low V
OL
I
SINK
= 10µA
V
DATAOUT Output-Voltage High V
OH
I
SOURCE
= 10µA
V
DD5
V
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, AVDD= DVDD= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50Ω, fRF= 315MHz, TA= -40°C
to +105°C, unless otherwise noted. Typical values are at AV
DD
= DVDD= V
DD5
= +3.3V and TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL CHARACTERISTICS
Startup Time t
ON
Time for valid signal detection after V
SHDN
= DV
DD
µs
Receiver Input Frequency f
RF
450
MHz
Maximum Receiver Input Level Modulation depth >18dB 0
dBm
Average carrier power level
Sensitivity (Note 3)
Peak power level
dBm
LNA gain from low to high 8 dB
AGC Hysteresis
Switching time from low to high gain 1 ms
Manchester coded 33
Maximum Data Rate
NRZ coded 66
kbps
LNA IN HIGH-GAIN MODE
fRF = 433MHz
fRF = 375MHz
Input Impedance
fRF = 315MHz
1dB Compression Point
-22
dBm
Input-Referred 3rd-Order
Intercept
-12
dBm
LO Signal Feedthrough to
Antenna
-80
dBm
Output Impedance
Normalized to 50Ω 0.12 - j4.4
Noise Figure NF
LNA
3dB
SYMBOL
MIN TYP MAX
0.125
0.125
250
Z
IN_LNA
P1dB
IIP3
LNA
Z
OUT_LNA
Normalized to 50Ω
LNA
300
-120
-114
1 - j3.4
1 - j3.9
1 - j4.7
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, AVDD= DVDD= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50Ω, fRF= 315MHz, TA= -40°C
to +105°C, unless otherwise noted. Typical values are at AV
DD
= DVDD= V
DD5
= +3.3V and TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LNA IN LOW-GAIN MODE
fRF = 433MHz
fRF = 375MHz
Input Impedance
(Note 4)
f
RF
= 315MHz
1dB Compression Point
-10
dBm
Input-Referred 3rd-Order
Intercept
-7
dBm
LO Signal Feedthrough to
Antenna
-80
dBm
Output Impedance
Normalized to 50Ω 0.4
Noise Figure NF
LNA
3dB
Voltage-Gain Reduction AGC enabled (depends on tank Q) 35 dB
MIXER
Input Impedance
Normalized to 50Ω 0.25 - j2.4
Input-Referred 3rd-Order
Intercept
IIP3
MIX
-18
dBm
Output Impedance
Ω
Noise Figure NF
MIX
16 dB
fRF = 433MHz, V
IRSEL
= DV
DD
42
fRF = 375MHz, V
IRSEL
= DV
DD
/ 2 44
Image Rejection
(Not Including LNA Tank)
f
RF
= 315MHz, V
IRSEL
= 0V 44
dB
LNA in high-gain
mode
48
LNA/Mixer Voltage Gain 330Ω IF filter load
LNA in low-gain
mode
13
dB
INTERMEDIATE FREQUENCY (IF)
Input Impedance Z
IN_IF
Ω
Operating Frequency f
IF
Bandpass response
MHz
3dB Bandwidth 10
MHz
RSSI Linearity
dB
RSSI Dynamic Range 80 dB
P
RFIN
< -120dBm
RSSI Level
P
RFIN
> 0dBm, AGC enabled 2.2
V
LNA gain from low to high
AGC Threshold
LNA gain from high to low
V
DATA FILTER
Maximum Bandwidth 50 kHz
DATA SLICER
Comparator Bandwidth
kHz
Z
IN_LNA
P1dB
IIP3
Z
OUT_LNA
Z
IN_MIX
Z
OUT_MIX
Normalized to 50Ω
LNA
LNA
1 - j3.4
1 - j3.9
1 - j4.7
330
330
10.7
±0.5
1.15
1.39
1.98
100
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
_______________________________________________________________________________________ 5
Note 1: 100% tested at TA= +25°C. Guaranteed by design and characterization over temperature.
Note 2: IRSEL is internally set to 375MHz IR mode. It can be left open when the 375MHz image-rejection setting is desired. Bypass
to AGND with a 1nF capacitor in a noisy environment.
Note 3: BER = 2 x 10
-3
, Manchester encoded, data rate = 4kbps, IF bandwidth = 280kHz.
Note 4: Input impedance is measured at the LNAIN pin. Note that the impedance includes the 15nH inductive degeneration con-
nected from the LNA source to ground. The equivalent input circuit is 50Ω in series with 2.2pF.
Note 5: Crystal oscillator frequency for other RF carrier frequency within the 300MHz to 450MHz range is (f
RF
- 10.7MHz) / 64 for
XTALSEL = 0V, and (f
RF
- 10.7MHz) / 32 for XTALSEL = V
DD5
.
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, AVDD= DVDD= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50Ω, fRF= 315MHz, TA= -40°C
to +105°C, unless otherwise noted. Typical values are at AV
DD
= DVDD= V
DD5
= +3.3V and TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Load Capacitance C
LOAD
10 pF
Output High Voltage
V
Output Low Voltage 0V
CRYSTAL OSCILLATOR
V
XTALSEL
= 0V
fRF = 433MHz
V
XTALSEL
= V
DD5
V
XTALSEL
= 0V
Crystal Frequency (Note 5) f
XTAL
fRF = 315MHz
V
XTALSEL
= V
DD5
MHz
Crystal Tolerance 50
ppm
Input Capacitance From each pin to ground 6.2 pF
Typical Operating Characteristics
(Typical Application Circuit , AVDD= DVDD= V
DD5
= +3.3V, fRF= 315MHz, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7033 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.53.43.33.23.1
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
4.0
3.0 3.6
+85°C
+105°C
+25°C
-40°C
SUPPLY CURRENT
vs. RF FREQUENCY
MAX7033 toc02
RF FREQUENCY (MHz)
SUPPLY CURRENT (mA)
450400300 350
3.5
4.0
4.5
5.0
6.0
5.5
6.5
7.0
3.0
250 500
+105°C
+85°C
-40°C
+25°C
BIT-ERROR RATE
vs. PEAK RF INPUT POWER
MAX7033 toc03
PEAK RF INPUT POWER (dBm)
BIT-ERROR RATE (%)
-116-118-120-122-124-126-128
0.1
1
10
100
0.01
-130 -114
fRF = 433MHz
fRF = 315MHz
V
DD5
6.6128
13.2256
4.7547
9.5094
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