19-3706; Rev 0; 5/05
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
General Description
The MAX7030 crystal-based, fractional-N transceiver is
designed to transmit and receive ASK/OOK data at fac-
tory-preset carrier frequencies of 315MHz, 345MHz
†
, or
433.92MHz with data rates up to 33kbps (Manchester
encoded) or 66kbps (NRZ encoded). This device gen-
erates a typical output power of +10dBm into a 50Ω
load, and exhibits typical sensitivity of -114dBm. The
MAX7030 features separate transmit and receive pins
(PAOUT and LNAIN) and provides an internal RF switch
that can be used to connect the transmit and receive
pins to a common antenna.
The MAX7030 transmit frequency is generated by a 16-
bit, fractional-N, phase-locked loop (PLL), while the
receiver’s local oscillator (LO) is generated by an inte-
ger-N PLL. This hybrid architecture eliminates the need
for separate transmit and receive crystal reference
oscillators because the fractional-N PLL is preset to be
10.7MHz above the receive LO. Retaining the fixed-N
PLL for the receiver avoids the higher current-drain
requirements of a fractional-N PLL and keeps the
receiver current drain as low as possible. All frequency-
generation components are integrated on-chip, and
only a crystal, a 10.7MHz IF filter, and a few discrete
components are required to implement a complete
antenna/digital data solution.
The MAX7030 is available in a small, 5mm x 5mm, 32-
pin thin QFN package, and is specified to operate over
the automotive -40°C to +125°C temperature range.
†
Consult factory for availability.
Features
♦
+2.1V to +3.6V or +4.5V to +5.5V Single-Supply
Operation
♦
Single-Crystal Transceiver
♦
Factory-Preset Frequency (No Serial Interface
Required)
♦
ASK/OOK Modulation
♦
+10dBm Output Power into 50Ω Load
♦
Integrated TX/RX Switch
♦
Integrated Transmit and Receive PLL, VCO, and
Loop Filter
♦
> 45dB Image Rejection
♦
Typical RF Sensitivity*: -114dBm
♦
Selectable IF Bandwidth with External Filter
♦
< 12.5mA Transmit-Mode Current
♦
< 6.7mA Receive-Mode Current
♦
< 800nA Shutdown Current
♦
Fast-On Startup Feature, <250µs
♦
Small, 32-Pin, Thin QFN Package
*0.2%
BER, 4kbps Manchester-encoded data, 280kHz IF BW
MAX7030
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
T3255-3
Applications
2-Way Remote Keyless Entry
Security Systems
Home Automation
Remote Controls
Remote Sensing
Smoke Alarms
Garage Door Openers
Local Telemetry Systems
MAX7030_ATJ -40°C to +125°C 32 Thin QFN-EP**
**EP
= Exposed paddle.
Note:
The MAX7030 is available with factory-preset operating
frequencies. See the Product Selector Guide for complete part
numbers.
Product Selector Guide
PART
MAX7030LATJ
MAX7030MATJ
MAX7030HATJ
CARRIER FREQUENCY (MHz)
315
345
433.92
Pin Configuration, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
MAX7030
ABSOLUTE MAXIMUM RATINGS
HV
IN
to GND..........................................................-0.3V to +6.0V
PAV
DD
, AV
DD
, DV
DD
to GND ................................-0.3V to +4.0V
ENABLE, T/R,
DATA, AGC0, AGC1,
AGC2 to GND .......................................-0.3V to (HV
IN
+ 0.3V)
All Other Pins to GND ...............................-0.3V to (_V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
32-Pin Thin QFN (derate 21.3mW/°C
above +70°C).............................................................1702mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +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,
50Ω system impedance, AV
DD
= DV
DD
= HV
IN
= PAV
DD
= +2.1V to +3.6V, f
RF
= 315MHz, 345MHz, or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= HV
IN
= PAV
DD
= +2.7V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage (3V Mode)
Supply Voltage (5V Mode)
SYMBOL
V
DD
HV
IN
CONDITIONS
HV
IN
, PAV
DD
, AV
DD
, and DV
DD
connected
to power supply
PAV
DD
, AV
DD
, and DV
DD
unconnected
from HV
IN
, but connected together
Transmit mode, PA off,
V
DATA
at 0% duty
cycle (Note 2)
Transmit mode, V
DATA
at 50% duty cycle
(Notes 3, 4)
Transmit mode, V
DATA
at 100% duty cycle
(Note 2)
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz
f
RF
= 434MHz
Receiver 315MHz
Supply Current
I
DD
Receiver 434MHz
T
A
< +85°C,
typ at +25°C
(Note 4)
Deep-sleep
(3V mode)
Deep-sleep
(5V mode)
Receiver 315MHz
Receiver 434MHz
T
A
< +125°C,
typ at +125°C
(Note 2)
Deep-sleep
(3V mode)
Deep-sleep
(5V mode)
Voltage Regulator
DIGITAL I/O
Input-High Threshold
Input-Low Threshold
V
IH
V
IL
(Note 2)
(Note 2)
0.9 x
HV
IN
0.1 x
HV
IN
V
V
V
REG
HV
IN
= 5V, I
LOAD
= 15mA
MIN
2.1
4.5
TYP
2.7
5.0
3.5
4.3
7.6
8.4
11.6
12.4
6.1
6.4
0.8
2.4
6.4
6.7
8.0
14.9
3.0
MAX
3.6
5.5
5.4
6.7
12.3
13.6
19.1
20.4
7.9
8.3
8.8
µA
10.9
8.2
8.4
34.2
µA
39.3
V
mA
mA
UNITS
V
V
2
_______________________________________________________________________________________
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, AV
DD
= DV
DD
= HV
IN
= PAV
DD
= +2.1V to +3.6V, fRF = 315MHz, 345MHz, or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= HV
IN
= PAV
DD
= +2.7V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Pulldown Sink Current
Output-Low Voltage
Output-High Voltage
V
OL
V
OH
SYMBOL
I
SINK
= 500µA
I
SOURCE
= 500µA
CONDITIONS
AGC0-2, ENABLE, T/R, DATA (HV
IN
= 5.5V)
MIN
TYP
20
0.15
HV
IN
- 0.26
MAX
UNITS
µA
V
V
MAX7030
AC ELECTRICAL CHARACTERISTICS
(Typical
Application Circuit,
50Ω system impedance, PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 315MHz, 345MHz, or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
GENERAL CHARACTERISTICS
Frequency Range
Maximum Input Level
Transmit Efficiency 100% Duty
Cycle
Transmit Efficiency 50% Duty
Cycle
P
RFIN
f
RF
= 315MHz (Note 6)
f
RF
= 434MHz (Note 6)
f
RF
= 315MHz (Note 6)
f
RF
= 434MHz (Note 6)
ENABLE or T/R transition low to high,
transmitter frequency settled to within
50kHz of the desired carrier
ENABLE or T/R transition low to high,
transmitter frequency settled to within 5kHz
of the desired carrier
ENABLE transition low to high, or T/R
transition high to low, receiver startup time
(Note 5)
RECEIVER
Sensitivity
Image Rejection
POWER AMPLIFIER
T
A
= +25°C (Note 4)
T
A
= +125°C, PAV
DD
= AV
DD
= DV
DD
=
HV
IN
= +2.1V (Note 2)
T
A
= -40°C, PAV
DD
= AV
DD
= DV
DD
=
HV
IN
= +3.6V (Note 4)
With output-matching network
4.6
3.9
10.0
6.7
13.1
82
-40
-50
15.8
dB
dBc
dBc
15.5
dBm
0.2% BER, 4kbps Manchester
data rate, 280kHz IF BW,
average RF power
315MHz
434MHz
-114
dBm
-113
46
dB
315/345/
433.92
0
32
30
24
22
200
MHz
dBm
%
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-On Time
t
ON
350
µs
250
Output Power
P
OUT
Modulation Depth
Maximum Carrier Harmonics
Reference Spur
_______________________________________________________________________________________
3
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
MAX7030
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 315MHz, 345MHz, or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
PHASE-LOCKED LOOP
Transmit VCO Gain
Transmit PLL Phase Noise
Receive VCO Gain
Receive PLL Phase Noise
Loop Bandwidth
Reference Frequency Input Level
LOW-NOISE AMPLIFIER/MIXER (Note 8)
LNA Input Impedance
Z
INLNA
Normalized to 50Ω
High-gain state
Voltage-Conversion Gain
Low-gain state
Input-Referred, 3rd-Order
Intercept Point
Mixer-Output Impedance
LO Signal Feedthrough to
Antenna
RSSI
Input Impedance
Operating Frequency
3dB Bandwidth
Gain
ANALOG BASEBAND
Maximum Data-Filter Bandwidth
Maximum Data-Slicer Bandwidth
Maximum Peak-Detector
Bandwidth
Maximum Data Rate
Manchester coded
Nonreturn to zero (NRZ)
50
100
50
33
66
kHz
kHz
kHz
kbps
f
IF
330
10.7
10
15
Ω
MHz
MHz
mV/dB
IIP3
High-gain state
Low-gain state
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz
f
RF
= 434MHz
1 - j4.7
1- j3.3
50
45
13
9
-42
-6
330
-100
dBm
Ω
dBm
dB
10kHz offset, 500kHz loop BW
1MHz offset, 500kHz loop BW
Transmit PLL
Receive PLL
SYMBOL
K
VCO
10kHz offset, 200kHz loop BW
1MHz offset, 200kHz loop BW
CONDITIONS
MIN
TYP
340
-68
-98
340
-80
-90
200
500
0.5
MAX
UNITS
MHz/V
dBc/Hz
MHz/V
dBc/Hz
kHz
V
P-P
4
_______________________________________________________________________________________
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 315MHz, 345MHz, or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
CRYSTAL OSCILLATOR
Crystal Frequency
Maximum Crystal Inductance
Frequency Pulling by V
DD
Crystal Load Capacitance
(Note 7)
f
XTAL
(f
RF
-10.7)
/ 24
50
2
4.5
MHz
mH
ppm/V
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX7030
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
100% tested at T
A
= +125°C. Guaranteed by design and characterization overtemperature.
50% duty cycle at 10kHz ASK data (Manchester coded).
Guaranteed by design and characterization. Not production tested.
Time for final signal detection; does not include baseband filter settling.
Efficiency = P
OUT
/ (V
DD
x I
DD
).
Dependent on PC board trace capacitance.
Input impedance is measured at the LNAIN pin. Note that the impedance at 315MHz includes the 12nH
inductive degeneration from the LNA source to ground. The impedance at 434MHz includes a 10nH induc-
tive degeneration connected from the LNA source to ground. The equivalent input circuit is 50Ω in series
with ~2.2pF. The voltage conversion is measured with the LNA input-matching inductor, the degeneration
inductor, and the LNA/mixer tank in place, and does not include the IF filter insertion loss.
Typical Operating Characteristics
(Typical
Operating Circuit,
PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +3.0V, f
RF
= 433.92MHz, IF BW = 280kHz, 4kbps Manchester encoded,
0.2% BER, T
A
= +25°C, unless otherwise noted.)
RECEIVER
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7030 toc01
SUPPLY CURRENT vs. RF FREQUENCY
MAX7030 toc02
DEEP-SLEEP CURRENT vs. TEMPERATURE
16
DEEP-SLEEP CURRENT (µA)
14
12
10
8
6
4
2
0
V
CC
= +3.6V
V
CC
= +3.0V
V
CC
= +2.1V
MAX7030 toc03
7.0
6.8
SUPPLY CURRENT (mA)
6.6
6.4
6.2
6.0
-40°C
5.8
5.6
2.1
2.4
2.7
3.0
3.3
+25°C
+85°C
+125°C
6.8
6.7
SUPPLY CURRENT (mA)
6.6
6.5
+85°C
6.4
6.3
6.2
6.1
6.0
-40°C
+25°C
+125°C
18
3.6
300
325
350
375
400
425
450
-40
-15
-10
35
60
85
110
SUPPLY VOLTAGE (V)
RF FREQUENCY (MHz)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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