19-3109; Rev 1; 3/09
315MHz/434MHz ASK Superheterodyne
Receiver
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.
o
Operates from Single +5.0V Supply
o
Selectable Image-Rejection Center Frequency
o
Selectable x64 or x32 f
LO
/f
XTAL
Ratio
o
Low (< 6.7mA) Operating Supply Current
o
< 3.0µA Low-Current Power-Down Mode for
Efficient Power Cycling
o
250µs Startup Time
o
Built-In 44dB RF Image Rejection
o
Excellent Receive Sensitivity Over Temperature
o
-40°C to +125°C Operation
Features
o
Optimized for 315MHz or 433.92MHz Band
MAX7034
Ordering Information
PART
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
28 TSSOP
MAX7034AUI/V+T
Applications
Automotive Remote
Keyless Entry
Security Systems
Garage Door Openers
Home Automation
Remote Controls
Local Telemetry
Wireless Sensors
/Vdenotes
an automotive qualified part.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration
TOP VIEW
XTAL1 1
AV
DD
2
LNAIN 3
LNASRC 4
AGND 5
LNAOUT 6
AV
DD
7
MIXIN1 8
MIXIN2 9
AGND 10
IRSEL 11
MIXOUT 12
DGND 13
DV
DD
14
Typical Application Circuit appears at end of data sheet.
+
28 XTAL2
27 SHDN
26 PDOUT
25 DATAOUT
MAX7034
24 V
DD5
23 DSP
22 DFFB
21 OPP
20 DSN
19 DFO
18 IFIN2
17 IFIN1
16 XTALSEL
15 EN_REG
TSSOP
________________________________________________________________
Maxim Integrated Products
1
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.
315MHz/434MHz ASK Superheterodyne
Receiver
MAX7034
ABSOLUTE MAXIMUM RATINGS
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,
SHDN,
EN_REG 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
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(Typical
Application Circuit,
V
DD5
= +4.5V to +5.5V, no RF signal applied. T
A
= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at V
DD5
= +5.0V and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
Shutdown Supply Current
Input-Voltage Low
SYMBOL
V
DD5
I
DD
I
SHDN
V
IL
EN_REG,
SHDN
Input-Voltage High
V
IH
XTALSEL
Input Logic Current High
I
IH
f
RF
= 434MHz, V
IRSEL
= DV
DD
Image-Reject Select Voltage
(Note 2)
f
RF
= 375MHz, V
IRSEL
= DV
DD
/2
f
RF
= 315MHz, V
IRSEL
= 0V
DATAOUT Output-Voltage Low
DATAOUT Output-Voltage High
V
OL
V
OH
I
SINK
= 10µA
I
SOURCE
= 10µA
0.125
V
DD5
-
0.125
DV
DD
-
0.4
1.1
DV
DD
-
1.5
0.4
V
V
V
V
DD5
-
0.4
DV
DD
-
0.4
15
V
CONDITIONS
+5.0V nominal supply voltage
V
SHDN
= V
DD5
V
SHDN
= 0V
f
RF
= 315MHz
f
RF
= 434MHz
MIN
4.5
TYP
5.0
6.7
7.2
3
MAX
5.5
8.2
8.7
8
0.4
UNITS
V
mA
µA
V
µA
2
_______________________________________________________________________________________
315MHz/434MHz ASK Superheterodyne
Receiver
AC ELECTRICAL CHARACTERISTICS
(Typical
Application Circuit,
V
VDD5
= +4.5V to +5.5V, all RF inputs are referenced to 50Ω, f
RF
= 433.92MHz, T
A
= -40°C to +125°C,
unless otherwise noted. Typical values are at V
VDD5
= +5.0V and T
A
= +25°C.) (Note 1)
PARAMETER
GENERAL CHARACTERISTICS
Startup Time
Receiver Input Frequency Range
Maximum Receiver Input Level
Sensitivity at T
A
= +25
o
C (Note 3)
Sensitivity at T
A
= +125°C
(Note 3)
Maximum Data Rate
LNA/MIXER
LNA/Mixer Voltage Gain (Note 4)
LNA/Mixer Input-Referred 1dB
Compression Point
Mixer Output Impedance
Mixer Image Rejection
INTERMEDIATE FREQUENCY (IF)
Input Impedance
Operating Frequency
3dB Bandwidth
RSSI Linearity
RSSI Dynamic Range
RSSI Level
P
RFIN
< -120dBm
P
RFIN
> -40dBm
Z
IN_IF
f
IF
Bandpass response
330
10.7
10
±0.5
80
1.15
2.2
Ω
MHz
MHz
dB
dB
V
Z
OUT_MIX
f
RF
= 434MHz, V
IRSEL
= DV
DD
f
RF
= 375MHz, V
IRSEL
= DV
DD
/2
f
RF
= 315MHz, V
IRSEL
= 0V
330Ω IF filter load
45
-50
330
42
44
44
dB
dB
dBm
Ω
+25°C, 315MHz
+25°C, 434MHz
+125°C, 315MHz
+125°C, 434MHz
Manchester coded
NRZ coded
t
ON
f
RF
Time for valid signal detection after V
SHDN
= V
DD5
. Does not include baseband filter
settling.
300
0
-114
-113
-113
-110
33
66
250
450
µs
MHz
dBm
dBm
dBm
kbps
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX7034
_______________________________________________________________________________________
3
315MHz/434MHz ASK Superheterodyne
Receiver
MAX7034
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
V
VDD5
= +4.5V to +5.5V, all RF inputs are referenced to 50Ω, f
RF
= 433.92MHz, T
A
= -40°C to +125°C,
unless otherwise noted. Typical values are at V
VDD5
= +5.0V and T
A
= +25°C.) (Note 1)
PARAMETER
DATA FILTER
Maximum Bandwidth
DATA SLICER
Comparator Bandwidth
Maximum Load Capacitance
Output High Voltage
Output Low Voltage
CRYSTAL OSCILLATOR
f
RF
= 433.92MHz
Crystal Frequency (Note 5)
f
XTAL
f
RF
= 315MHz
Crystal Tolerance
Input Capacitance
From each pin to ground
V
XTALSEL
= 0V
V
XTALSEL
= DV
DD
V
XTALSEL
= 0V
V
XTALSEL
= DV
DD
6.6128
13.2256
4.7547
9.5094
50
6.2
ppm
pF
MHz
C
LOAD
100
10
V
VDD5
0
kHz
pF
V
V
50
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
100% tested at T
A
= +125°C. Guaranteed by design and characterization over entire temperature range.
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:
Peak power level. BER = 2 x 10
-3
, Manchester encoded, data rate = 4kbps, IF bandwidth = 280kHz.
Note 4:
The voltage conversion gain is measured with the LNA input matching inductor and the LNA/Mixer resonator in place, and
does not include the IF filter insertion loss.
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 = DV
DD
.
4
_______________________________________________________________________________________
315MHz/434MHz ASK Superheterodyne
Receiver
Typical Operating Characteristics
(Typical
Application Circuit,
V
DD5
= +5.0V, f
RF
= 433.92MHz, T
A
= +25°C, unless otherwise noted.)
BIT-ERROR RATE
vs. PEAK RF INPUT POWER
MAX7034 toc02
MAX7034
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7034 toc01
SUPPLY CURRENT vs. RF FREQUENCY
9.0
8.5
SUPPLY CURRENT (mA)
8.0
7.5
7.0
6.5
6.0
5.5
5.0
-40°C
0.01
250
300
350
400
450
RF FREQUENCY (MHz)
500
-130
+25°C
+125°C
+105°C
+85°C
100.00
433.92MHz
10.00
BIT-ERROR RATE (%)
7.6
SUPPLY CURRENT (mA)
7.4
7.2
7.0
6.8
6.6
4.5
4.7
4.9
5.1
5.3
SUPPLY VOLTAGE (V)
+85°C
+105°C
+125°C
1.00
+25°C
315MHz
0.10
-40°C
5.5
-125
-120
-115
PEAK RF INPUT POWER (dBm)
-110
SENSITIVITY vs. TEMPERATURE
MAX7034 toc04
RSSI vs. RF INPUT POWER
MAX7034 toc05
RSSI AND DELTA vs. IF INPUT POWER
2.40
2.20
2.00
RSSI (V)
1.80
1.60
1.40
1.20
1.00
DELTA
-5
-10
MAX7034 toc06
-102
-104
-106
SENSITIVITY (dBm)
-108
-110
-112
-114
-116
-118
-120
-40
-15
10
35
60
85
TEMPERATURE (°C)
110
315MHz
433.92MHz
2.40
2.20
2.00
RSSI (V)
1.80
1.60
1.40
1.20
1.00
-140 -120 -100 -80 -60 -40
RF INPUT POWER (dBm)
-20
0
IF BANDWIDTH = 280kHz
RSSI
MAX7034 toc03
7.8
15
10
5
0
DELTA
-15
-20
-25
-90 -80 -70 -60 -50 -40 -30 -20 -10 0
IF INPUT POWER (dBm)
10
LNA/MIXER VOLTAGE GAIN
vs. IF FREQUENCY
MAX7034 toc07
IMAGE REJECTION vs. RF FREQUENCY
MAX7034 toc08
IMAGE REJECTION vs. TEMPERATURE
MAX7034 toc09
65
UPPER SIDEBAND
55
LNA/MIXER VOLTAGE GAIN (dB)
45
35
25
15
LOWER SIDEBAND
5
-5
0
5
10
15
20
IF FREQUENCY (MHz)
25
49.7dB
IMAGE
REJECTION
60
f
RF
= 315MHz
50
IMAGE REJECTION (dB)
40
30
20
10
0
f
RF
= 433.92MHz
52
50
IMAGE REJECTION (dB)
48
46
44
42
40
433.92MHz
315MHz
30
280 300 320 340 360 380 400 420 440 460 480
RF FREQUENCY (MHz)
-40
-15
10
35
60
85
TEMPERATURE (°C)
110
_______________________________________________________________________________________
5
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