19-3685; Rev 2; 11/10
KIT
ATION
EVALU
BLE
AVAILA
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
General Description
The MAX7032 crystal-based, fractional-N transceiver is
designed to transmit and receive ASK/OOK or FSK
data in the 300MHz to 450MHz frequency range with
data rates up to 33kbps (Manchester encoded) or
66kbps (NRZ encoded). This device generates a typi-
cal output power of +10dBm into a 50Ω load, and
exhibits typical sensitivities of -114dBm for ASK data
and -110dBm for FSK data. The MAX7032 features sep-
arate 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 MAX7032 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 allows the
transmit frequency to be set within 2kHz of the receive
frequency. The 12-bit resolution of the fractional-N PLL
allows frequency multiplication of the crystal frequency
in steps of f
XTAL
/4096. 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.
The fractional-N architecture of the MAX7032 transmit
PLL allows the transmit FSK signal to be programmed for
exact frequency deviations, and completely eliminates
the problems associated with oscillator-pulling FSK sig-
nal generation. 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 imple-
ment a complete antenna/digital data solution.
The MAX7032 is available in a small 5mm x 5mm, 32-pin,
thin QFN package, and is specified to operate in the
automotive -40°C to +125°C temperature range.
Features
♦
+2.1V to +3.6V or +4.5V to +5.5V Single-Supply
Operation
♦
Single Crystal Transceiver
♦
User-Adjustable 300MHz to 450MHz Carrier
Frequency
♦
ASK/OOK and FSK Modulation
♦
User-Adjustable FSK Frequency Deviation
Through Fractional-N PLL Register
♦
Agile Transmitter Frequency Synthesizer with
f
XTAL
/4096 Carrier-Frequency Spacing
♦
+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*
ASK: -114dBm
FSK: -110dBm
♦
Selectable IF Bandwidth with External Filter
♦
RSSI Output with High Dynamic Range
♦
Autopolling Low-Power Management
♦
< 12.5mA Transmit-Mode Current
♦
< 6.7mA Receive-Mode Current
♦
< 23.5µA Polling-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,
average RF power
MAX7032
Applications
2-Way Remote Keyless Entry
Security Systems
Home Automation
Remote Controls
Remote Sensing
Smoke Alarms
Garage Door Openers
Local Telemetry Systems
Ordering Information
PART
MAX7032ATJ+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
32 Thin QFN-EP**
+Denotes
a lead(Pb)-free/RoHS-compliant package.
**EP
= Exposed pad.
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 Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
MAX7032
ABSOLUTE MAXIMUM RATINGS
HVIN to GND .........................................................-0.3V to +6.0V
PAVDD, AVDD, DVDD to GND..............................-0.3V to +4.0V
ENABLE, T/R, DATA,
CS,
DIO, SCLK, CLKOUT to
GND......................................................-0.3V to (HVIN + 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
Soldering Temperature (reflow) .......................................+260°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, V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz,
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.7V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
Supply Voltage (3V Mode)
Supply Voltage (5V Mode)
SYMBOL
V
DD
HVIN
CONDITIONS
HVIN, PAVDD, AVDD, and DVDD connected to
power supply
PAVDD, AVDD, and DVDD unconnected from
HVIN, but connected together
Transmit mode, PA off,
V
DATA
at 0% duty cycle
(ASK) (Note 2)
Transmit mode, V
DATA
at 50% duty cycle
(ASK) (Notes 3, 4)
Transmit mode, V
DATA
at 100% duty cycle
(FSK)
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz
f
RF
= 434MHz
f
RF
= 315MHz (Note 4)
f
RF
= 434MHz (Note 2)
Receiver (ASK 315MHz)
Receiver (ASK 434MHz)
Receiver (FSK 315MHz)
Supply Current
I
DD
T
A
< +85°C,
typ at +25°C
(Note 4)
Receiver (FSK 434MHz)
DRX (3V mode)
DRX (5V mode)
Deep-sleep (3V mode)
Deep-sleep (5V mode)
Receiver (ASK 315MHz)
Receiver (ASK 434MHz)
Receiver (FSK 315MHz)
T
A
< +125°C,
typ at +125°C
(Note 2)
Receiver (FSK 434MHz)
DRX (3V mode)
DRX (5V mode)
Deep-sleep (3V mode)
Deep-sleep (5V mode)
Voltage Regulator
V
REG
V
HVIN
= 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
6.4
6.7
23.4
67.2
0.8
2.4
6.4
6.7
6.8
7.0
33.5
82.3
8.0
14.9
3.0
MAX
3.6
5.5
5.4
6.7
12.3
mA
13.6
19.1
20.4
7.9
8.3
8.4
8.7
77.3
94.4
8.8
10.9
8.2
8.4
8.7
8.8
103.0
116.1
34.2
39.3
V
µA
mA
µA
mA
UNITS
V
V
2
_______________________________________________________________________________________
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz,
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.7V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
DIGITAL I/O
Input High Threshold
Input Low Threshold
Pulldown Sink Current
Pullup Source Current
Output-Low Voltage
Output-High Voltage
V
OL
V
OH
V
IH
V
IL
(Note 2)
(Note 2)
SCLK, ENABLE, T/R, DATA (V
HVIN
= 5.5V)
DIO,
CS
(V
HVIN
= 5.5V)
I
SINK
= 500µA
I
SOURCE
= 500µA
0.9 x V
HVIN
0.1 x V
HVIN
20
20
0.15
V
HVIN
-
0.26
V
V
µA
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX7032
AC ELECTRICAL CHARACTERISTICS
(Typical
Application Circuit,
50Ω system impedance, V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz,
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
PAVDD
= V
AVDD
= V
DVDD
= V
HVIN
= +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
0.2% BER, 4kbps
Manchester data rate,
280kHz IF BW, ±50kHz
FSK deviation,
average power
(Note 8)
ASK (315MHz)
ASK (434MHz)
FSK (315MHz)
FSK (434MHz)
-114
-113
-110
-107
46
dB
dBm
300
0
32
30
24
22
200
450
MHz
dBm
%
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-On Time
t
ON
350
µs
250
Sensitivity
Image Rejection
_______________________________________________________________________________________
3
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
MAX7032
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz,
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
PAVDD
= V
AVDD
= V
DVDD
= V
HVIN
= +2.7V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
POWER AMPLIFIER
T
A
= +25°C (Note 4)
Output Power
P
OUT
T
A
= +125°C, V
AVDD
= V
DVDD
= V
HVIN
=
V
PAVDD
= +2.1V (Note 2)
T
A
= -40°C, V
AVDD
= V
DVDD
= V
HVIN
=
V
PAVDD
= +3.6V (Note 4)
Modulation Depth
Maximum Carrier Harmonics
Reference Spur
PHASE-LOCKED LOOP
Transmit VCO Gain
Transmit PLL Phase Noise
Receive VCO Gain
Receive PLL Phase Noise
Loop Bandwidth
Minimum Transmit Frequency
Step
Reference Frequency Input Level
Programmable Divider Range
LOW-NOISE AMPLIFIER/MIXER
(Note 9)
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
f
IF
330
10.7
10
Ω
MHz
MHz
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
In transmit mode (Note 4)
20
10kHz offset, 500kHz loop BW
1MHz offset, 500kHz loop BW
Transmit PLL
Receive PLL
K
VCO
10kHz offset, 200kHz loop BW
1MHz offset, 200kHz loop BW
340
-68
-98
340
-80
-90
200
500
f
XTAL
/
4096
0.5
27
MHz/V
dBc/Hz
MHz/V
dBc/Hz
kHz
kHz
V
P-P
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical
Application Circuit,
50Ω system impedance, V
AVDD
= V
DVDD
= V
PAVDD
= V
HVIN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz,
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
PAVDD
= V
AVDD
= V
DVDD
= V
HVIN
= +2.7V, T
A
= +25°C, unless
otherwise noted.) (Note 1)
PARAMETER
Gain
FSK DEMODULATOR
Conversion Gain
ANALOG BASEBAND
Maximum Data Filter Bandwidth
Maximum Data Slicer Bandwidth
Maximum Peak Detector
Bandwidth
Maximum Data Rate
CRYSTAL OSCILLATOR
Crystal Frequency
Frequency Pulling by V
DD
Crystal Load Capacitance
Minimum SCLK Setup to Falling
Edge of
CS
Minimum
CS
Falling Edge to
SCLK Rising-Edge Setup Time
Minimum
CS
Idle Time
Minimum
CS
Period
Maximum SCLK Falling Edge to
Data Valid Delay
Minimum Data Valid to SCLK
Rising-Edge Setup Time
Minimum Data Valid to SCLK
Rising-Edge Hold Time
Minimum SCLK High Pulse Width
Minimum SCLK Low Pulse Width
Minimum
CS
Rising Edge to
SCLK Rising-Edge Hold Time
Maximum
CS
Falling Edge to
Output Enable Time
Maximum
CS
Rising Edge to
Output Disable Time
(Note 7)
SERIAL INTERFACE TIMING CHARACTERISTICS
(see Figure 7)
t
SC
t
CSS
t
CSI
t
CS
t
DO
t
DS
t
DH
t
CH
t
CL
t
CSH
t
DV
t
TR
30
30
125
2.125
80
30
30
100
100
30
25
25
ns
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
ns
f
XTAL
(f
RF
- 10.7)/24
2
4.5
MHz
ppm/V
pF
Manchester coded
NRZ
50
100
50
33
66
kHz
kHz
kHz
kbps
2.0
mV/kHz
SYMBOL
CONDITIONS
MIN
TYP
15
MAX
UNITS
mV/dB
MAX7032
_______________________________________________________________________________________
5
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