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 50
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 require-
ments of a fractional-N PLL and keeps the receiver cur-
rent 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 -40C to +125C temperature range.
Applications
2-Way Remote Keyless Entry
Security Systems
Home Automation
Remote Controls
Remote Sensing
Smoke Alarms
Garage Door Openers
Local Telemetry Systems
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 50 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
< 23.5A Polling-Mode Current
< 800nA Shutdown Current
Fast-On Startup Feature, < 250s
Small 32-Pin, Thin QFN Package
MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-3685; Rev 0; 5/05
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.
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX7032ATJ
-40C to +125C 32 Thin QFN-EP** T3255-3
*0.2% BER, 4kbps Manchester-encoded data, 280kHz IF BW,
average RF power
**EP = Exposed paddle.
Pin Configuration, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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, CS, DIO, SCLK, CLKOUT 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
= +70C)
32-Pin Thin QFN (derate 21.3mW/C above +70C)....1702mW
Operating Temperature Range .........................-40C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, 50
system impedance, AV
DD
= DV
DD
= P
AVDD
= HV
IN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
=
-40C to +125C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= PAV
DD
= HV
IN
= +2.7V, T
A
= +25C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage (3V Mode)
V
DD
HV
IN
, PAV
DD
, AV
DD
, and DV
DD
connected to
power supply
2.1
2.7
3.6
V
Supply Voltage (5V Mode)
HV
IN
PAV
DD
, AV
DD
, and DV
DD
unconnected from HV
IN
,
but connected together
4.5
5.0
5.5
V
f
RF
= 315MHz
3.5
5.4
Transmit mode, PA off,
V
DATA
at 0% duty cycle
(ASK) (Note 2)
f
RF
= 434MHz
4.3
6.7
f
RF
= 315MHz
7.6
12.3
Transmit mode, V
DATA
at 50% duty cycle
(ASK) (Notes 3, 4)
f
RF
= 434MHz
8.4
13.6
f
RF
= 315MHz (Note 4)
11.6
19.1
Transmit mode, V
DATA
at 100% duty cycle
(FSK)
f
RF
= 434MHz (Note 2)
12.4
20.4
mA
Receiver (ASK 315MHz)
6.1
7.9
Receiver (ASK 434MHz)
6.4
8.3
Receiver (FSK 315MHz)
6.4
8.4
Receiver (FSK 434MHz)
6.7
8.7
mA
DRX (3V mode)
23.4
77.3
DRX (5V mode)
67.2
94.4
Deep-sleep (3V mode)
0.8
8.8
T
A
< +85C,
typ at +25C
(Note 4)
Deep-sleep (5V mode)
2.4
10.9
A
Receiver (ASK 315MHz)
6.4
8.2
Receiver (ASK 434MHz)
6.7
8.4
Receiver (FSK 315MHz)
6.8
8.7
Receiver (FSK 434MHz)
7.0
8.8
mA
DRX (3V mode)
33.5
103.0
DRX (5V mode)
82.3
116.1
Deep-sleep (3V mode)
8.0
34.2
Supply Current
I
DD
T
A
< +125C
typ at +125C
(Note 2)
Deep-sleep (5V mode)
14.9
39.3
A
Voltage Regulator
V
REG
HV
IN
= 5V, I
LOAD
= 15mA
3.0
V
MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50
system impedance, AV
DD
= DV
DD
= P
AVDD
= HV
IN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
=
-40C to +125C, unless otherwise noted. Typical values are at AV
DD
= DV
DD
= PAV
DD
= HV
IN
= +2.7V, T
A
= +25C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL I/O
Input High Threshold
V
IH
(Note 2)
0.9 x HV
IN
V
Input Low Threshold
V
IL
(Note 2)
0.1 x HV
IN
V
Pulldown Sink Current
SCLK, ENABLE, T/R, DATA (HV
IN
= 5.5V)
20
A
Pullup Source Current
DIO, CS (HV
IN
= 5.5V)
20
A
Output-Low Voltage
V
OL
I
SINK
= 500A
0.15
V
Output-High Voltage
V
OH
I
SOURCE
= 500A
HV
IN
-
0.26
V
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, 50
system impedance, AV
DD
= DV
DD
= PAV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
=
-40C to +125C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL CHARACTERISTICS
Frequency Range
300
450
MHz
Maximum Input Level
P
RFIN
0
dBm
f
RF
= 315MHz (Note 6)
32
Transmit Efficiency 100% Duty
Cycle
f
RF
= 434MHz (Note 6)
30
%
f
RF
= 315MHz (Note 6)
24
Transmit Efficiency 50% Duty
Cycle
f
RF
= 434MHz (Note 6)
22
%
ENABLE or T/R transition low to high,
transmitter frequency settled to within
50kHz of the desired carrier
200
ENABLE or T/R transition low to high,
transmitter frequency settled to within 5kHz
of the desired carrier
350
Power-On Time
t
ON
ENABLE transition low to high, or T/R
transition high to low receiver startup time
(Note 5)
250
s
RECEIVER
ASK (315MHz)
-114
ASK (434MHz)
-113
FSK (315MHz)
-110
Sensitivity
0.2% BER, 4kbps
Manchester data rate,
280kHz IF BW, 50kHz
FSK deviation,
average power
FSK (434MHz)
-107
dBm
Image Rejection
(Note 8)
46
dB
MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
4
_______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50
system impedance, AV
DD
= DV
DD
= PAV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
=
-40C to +125C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER AMPLIFIER
T
A
= +25C (Note 4)
4.6
10.0
15.5
T
A
= +125C, AV
DD
= DV
DD
= HV
IN
=
PAV
DD
= +2.1V (Note 2)
3.9
6.7
Output Power
P
OUT
T
A
= -40C, AV
DD
= DV
DD
= HV
IN
=
PAV
DD
= +3.6V (Note 4)
13.1
15.8
dBm
Modulation Depth
82
dB
Maximum Carrier Harmonics
With output-matching network
-40
dBc
Reference Spur
-50
dBc
PHASE-LOCKED LOOP
Transmit VCO Gain
K
VCO
340
MHz/V
10kHz offset, 200kHz loop BW
-68
Transmit PLL Phase Noise
1MHz offset, 200kHz loop BW
-98
dBc/Hz
Receive VCO Gain
340
MHz/V
10kHz offset, 500kHz loop BW
-80
Receive PLL Phase Noise
1MHz offset, 500kHz loop BW
-90
dBc/Hz
Transmit PLL
200
Loop Bandwidth
Receive PLL
500
kHz
Minimum Transmit Frequency
Step
f
XTAL
/
4096
kHz
Reference Frequency Input Level
0.5
V
P-P
Programmable Divider Range
In transmit mode (Note 4)
20
27
LOW-NOISE AMPLIFIER/MIXER (Note 9)
f
RF
= 315MHz
1 - j4.7
LNA Input Impedance
Z
INLNA
Normalized to
50
f
RF
= 434MHz
1 - j3.3
f
RF
= 315MHz
50
High-gain state
f
RF
= 434MHz
45
f
RF
= 315MHz
13
Voltage-Conversion Gain
Low-gain state
f
RF
= 434MHz
9
dB
High-gain state
-42
Input-Referred 3rd-Order
Intercept Point
IIP3
Low-gain state
-6
dBm
Mixer Output Impedance
330
LO Signal Feedthrough to
Antenna
-100
dBm
RSSI
Input Impedance
330
Operating Frequency
f
IF
10.7
MHz
3dB Bandwidth
10
MHz
MAX7032
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
_______________________________________________________________________________________
5
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50
system impedance, AV
DD
= DV
DD
= PAV
DD
= HV
IN
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
=
-40C to +125C, unless otherwise noted. Typical values are at PAV
DD
= AV
DD
= DV
DD
= HV
IN
= +2.7V, T
A
= +25C, unless otherwise
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain
15
mV/dB
FSK DEMODULATOR
Conversion Gain
2.0
mV/kHz
ANALOG BASEBAND
Maximum Data Filter Bandwidth
50
kHz
Maximum Data Slicer Bandwidth
100
kHz
Maximum Peak Detector
Bandwidth
50
kHz
Manchester coded
33
Maximum Data Rate
NRZ
66
kbps
CRYSTAL OSCILLATOR
Crystal Frequency
f
XTAL
(f
RF
- 10.7)
/ 24
MHz
Maximum Crystal Inductance
50
mH
Frequency Pulling by V
DD
2
ppm/V
Crystal Load Capacitance
(Note 7)
4.5
pF
SERIAL INTERFACE TIMING CHARACTERISTICS (see Figure 7)
Minimum SCLK Setup to Falling
Edge of CS
t
SC
30
ns
Minimum CS Falling Edge to
SCLK Rising-Edge Setup Time
t
CSS
30
ns
Minimum CS Idle Time
t
CSI
125
ns
Minimum CS Period
t
CS
2.125
s
Maximum SCLK Falling Edge to
Data Valid Delay
t
DO
80
ns
Minimum Data Valid to SCLK
Rising-Edge Setup Time
t
DS
30
ns
Minimum Data Valid to SCLK
Rising-Edge Hold Time
t
DH
30
ns
Minimum SCLK High Pulse Width
t
CH
100
ns
Minimum SCLK Low Pulse Width
t
CL
100
ns
Minimum CS Rising Edge to
SCLK Rising-Edge Hold Time
t
CSH
30
ns
Maximum CS Falling Edge to
Output Enable Time
t
DV
25
ns
Maximum CS Rising Edge to
Output Disable Time
t
TR
25
ns
PDF 
ZIP