General Description
The MAX7033 fully integrated low-power CMOS super-
heterodyne receiver is ideal for receiving amplitude-
shift-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 compo-
nents and a low-current power-down mode, it is ideal
for cost-sensitive and power-sensitive applications typi-
cal in the automotive and consumer markets. The
MAX7033 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 ana-
log 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 (-40C to +105C)
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 f
LO
/f
XTAL
Ratio
Low 5.2mA Operating Supply Current
<3.5A Low-Current Power-Down Mode for
Efficient Power Cycling
250s Startup Time
Built-In 44dB RF Image Rejection
Better than -114dBm Receive Sensitivity
-40C to +105C 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
31
30
29
28
27
26
LNASRC
LNAIN
AV
DD
XTAL1
XTAL2
SHDN
PDOUT
25
N.C.
9
10
11
12
13
14
15
MIXOUT
DGND
DV
DD
AC
N.C.
XTALSEL
IFIN1
16
IFIN2
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
1
N.C.
24
DATAOUT
Pin Configurations
Ordering Information
Applications
19-3273; Rev 1; 7/04
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
-40C to +105C
28 TSSOP
MAX7033ETJ*
-40C to +105C
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, AV
DD
= DV
DD
= V
DD5
= +3.0V to +3.6V, no RF signal applied, T
A
= -40C to +105C, unless otherwise
noted. Typical values are at AV
DD
= DV
DD
= V
DD5
= +3.3V and T
A
= +25C.) (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
= +70C)
28-Pin TSSOP (derate 12.8mW/C above +70C) ..1025.6mW
32-Thin QFN (derate 21.3mW/C above +70C) ....1702.1mW
Operating Temperature Range .........................-40C to +105C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-60C to +150C
Lead Temperature (soldering 10s) ..................................+300C
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
f
RF
= 315MHz
5.2
6.23
Supply Current
I
DD
V
SHDN
= DV
DD
f
RF
= 433MHz
5.7
6.88
mA
f
RF
= 315MHz
2.6
Shutdown Supply Current
I
SHDN
V
SHDN
= 0V,
V
XTALSEL
= 0V
f
RF
= 433MHz
3.5
8.0
A
Input-Voltage Low
V
IL
0.4
V
Input-Voltage High
V
IH
DV
DD
-
0.4
V
Input Logic Current High
I
IH
10
A
f
RF
= 433MHz, V
IRSEL
= V
DD5
V
DD5
-
0.4
f
RF
= 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
= 10A
0.125
V
DATAOUT Output-Voltage High
V
OH
I
SOURCE
= 10A
DV
DD
-
0.125
V
DC ELECTRICAL CHARACTERISTICS (+5.0V OPERATION)
(Typical Application Circuit, V
DD5
= +4.5V to +5.5V, no RF signal applied, T
A
= -40C to +105C, unless otherwise noted. Typical val-
ues are at V
DD5
= +5.0V and T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
DD5
+5.0V nominal supply voltage
4.5
5.0
5.5
V
f
RF
= 315MHz
5.2
6.4
Supply Current
I
DD
V
SHDN
= V
DD5
f
RF
= 433MHz
5.7
6.76
mA
f
RF
= 315MHz
3.7
Shutdown Supply Current
I
SHDN
V
SHDN
= 0V,
V
XTALSEL
= 0V
f
RF
= 433MHz
4.2
9.0
A
Input-Voltage Low
V
IL
0.4
V
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, T
A
= -40C to +105C, unless otherwise noted. Typical val-
ues are at V
DD5
= +5.0V and T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input-Voltage High
V
IH
V
DD5
-
0.4
V
Input Logic Current High
I
IH
15
A
f
RF
= 433MHz, V
IRSEL
= V
DD5
V
DD5
-
0.4
f
RF
= 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
= 10A
0.125
V
DATAOUT Output-Voltage High
V
OH
I
SOURCE
= 10A
V
DD5
-
0.125
V
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, AV
DD
= DV
DD
= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50, f
RF
= 315MHz, T
A
= -40C
to +105C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= V
DD5
= +3.3V and T
A
= +25C.) (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
250
s
Receiver Input Frequency
f
RF
300
450
MHz
Maximum Receiver Input Level
Modulation depth >18dB
0
dBm
Average carrier power level
-120
Sensitivity (Note 3)
Peak power level
-114
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
f
RF
= 433MHz
1 - j3.4
f
RF
= 375MHz
1 - j3.9
Input Impedance
Z
IN_LNA
Normalized to 50
f
RF
= 315MHz
1 - j4.7
1dB Compression Point
P1dB
LNA
-22
dBm
Input-Referred 3rd-Order
Intercept
IIP3
LNA
-12
dBm
LO Signal Feedthrough to
Antenna
-80
dBm
Output Impedance
Z
OUT_LNA
Normalized to 50
0.12 - j4.4
Noise Figure
NF
LNA
3
dB
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
4
_______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, AV
DD
= DV
DD
= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50, f
RF
= 315MHz, T
A
= -40C
to +105C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= V
DD5
= +3.3V and T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LNA IN LOW-GAIN MODE
f
RF
= 433MHz
1 - j3.4
f
RF
= 375MHz
1 - j3.9
Input Impedance
Z
IN_LNA
Normalized to 50
(Note 4)
f
RF
= 315MHz
1 - j4.7
1dB Compression Point
P1dB
LNA
-10
dBm
Input-Referred 3rd-Order
Intercept
IIP3
LNA
-7
dBm
LO Signal Feedthrough to
Antenna
-80
dBm
Output Impedance
Z
OUT_LNA
Normalized to 50
0.4
Noise Figure
NF
LNA
3
dB
Voltage-Gain Reduction
AGC enabled (depends on tank Q)
35
dB
MIXER
Input Impedance
Z
IN_MIX
Normalized to 50
0.25 - j2.4
Input-Referred 3rd-Order
Intercept
IIP3
MIX
-18
dBm
Output Impedance
Z
OUT_MIX
330
Noise Figure
NF
MIX
16
dB
f
RF
= 433MHz, V
IRSEL
= DV
DD
42
f
RF
= 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
330
IF filter load
LNA in low-gain
mode
13
dB
INTERMEDIATE FREQUENCY (IF)
Input Impedance
Z
IN_IF
330
Operating Frequency
f
IF
Bandpass response
10.7
MHz
3dB Bandwidth
10
MHz
RSSI Linearity
0.5
dB
RSSI Dynamic Range
80
dB
P
RFIN
< -120dBm
1.15
RSSI Level
P
RFIN
> 0dBm, AGC enabled
2.2
V
LNA gain from low to high
1.39
AGC Threshold
LNA gain from high to low
1.98
V
DATA FILTER
Maximum Bandwidth
50
kHz
DATA SLICER
Comparator Bandwidth
100
kHz
MAX7033
315MHz/433MHz ASK Superheterodyne
Receiver with AGC Lock
_______________________________________________________________________________________
5
Note 1:
100% tested at T
A
= +25C. 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 50 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, AV
DD
= DV
DD
= V
DD5
= +3.0V to +3.6V, all RF inputs are referenced to 50, f
RF
= 315MHz, T
A
= -40C
to +105C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= V
DD5
= +3.3V and T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Load Capacitance
C
LOAD
10
pF
Output High Voltage
V
DD5
V
Output Low Voltage
0
V
CRYSTAL OSCILLATOR
V
XTALSEL
= 0V
6.6128
f
RF
= 433MHz
V
XTALSEL
= V
DD5
13.2256
V
XTALSEL
= 0V
4.7547
Crystal Frequency (Note 5)
f
XTAL
f
RF
= 315MHz
V
XTALSEL
= V
DD5
9.5094
MHz
Crystal Tolerance
50
ppm
Input Capacitance
From each pin to ground
6.2
pF
Typical Operating Characteristics
(Typical Application Circuit , AV
DD
= DV
DD
= V
DD5
= +3.3V, f
RF
= 315MHz, T
A
= +25C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7033 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.5
3.4
3.3
3.2
3.1
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
+85C
+105C
+25C
-40C
SUPPLY CURRENT
vs. RF FREQUENCY
MAX7033 toc02
RF FREQUENCY (MHz)
SUPPLY CURRENT (mA)
450
400
300
350
3.5
4.0
4.5
5.0
6.0
5.5
6.5
7.0
3.0
250
500
+105C
+85C
-40C
+25C
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
f
RF
= 433MHz
f
RF
= 315MHz
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