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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7031 Datasheet

ASK Transceiver

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MAX7031 pdf
19-3707; Rev 0; 5/05
Low-Cost, 308MHz, 315MHz, and 433.92MHz
FSK Transceiver with Fractional-N PLL
General Description
www.dTathaeshMeeAt4Xu7.c0o3m1 crystal-based, fractional-N transceiver is
designed to transmit and receive FSK data at factory-
preset carrier frequencies of 308MHz, 315MHz, 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 50
load, and exhibits typical sensitivity of -110dBm. The
MAX7031 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 MAX7031 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.
The fractional-N architecture of the MAX7031 transmit
PLL allows the transmit FSK signal to be preset 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
implement a complete antenna/digital data solution.
The MAX7031 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.
Consult factory for availability.
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
Factory-Preset Frequency (No Serial Interface
Required)
FSK Modulation
Factory-Preset FSK Frequency Deviation
+10dBm Output Power into 50Load
Integrated TX/RX Switch
Integrated Transmit and Receive PLL, VCO, and
Loop Filter
> 45dB Image Rejection
Typical RF Sensitivity*: -110dBm
Selectable IF Bandwidth with External Filter
RSSI Output with High Dynamic Range
< 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
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
MAX7031_ATJ__
-40°C to
+125°C
32 Thin QFN-EP** T3255-3
**EP = Exposed paddle.
Note: The MAX7031 is available with factory-preset operating
frequencies. See the Selector Guide for complete part num-
bers.
Pin Configuration, Selector Guide, 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7031 Datasheet

ASK Transceiver

No Preview Available !

MAX7031 pdf
Low-Cost, 308MHz, 315MHz, and 433.92MHz
FSK Transceiver with Fractional-N PLL
ABSOLUTE MAXIMUM RATINGS
www.dHatVaIsNhetoetG4uN.Dco..m........................................................-0.3V to +6.0V
PAVDD, AVDD, DVDD to GND ................................-0.3V to +4.0V
ENABLE, T/R, DATA, AGC0, AGC1,
AUTOCAL to GND ................................-0.3V to (HVIN + 0.3)V
All Other Pins to GND ..............................-0.3V to (_VDD + 0.3)V
Continuous Power Dissipation (TA = +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, 50system impedance, PAVDD = AVDD = DVDD = HVIN = +2.1V to +3.6V, fRF = 308MHz, 315MHz, or
433.92MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at PAVDD = AVDD = DVDD = HVIN = +2.7V, TA = +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage (3V Mode)
VDD
HVIN, PAVDD, AVDD, and DVDD connected
to power supply
2.1
2.7
3.6
V
Supply Voltage (5V Mode)
Supply Current
Voltage Regulator
DIGITAL I/O
HVIN
IDD
VREG
PAVDD, AVDD, and DVDD unconnected
from HVIN, but connected together
Transmit mode
(Note 2)
TA < +85°C,
typ at +25°C
(Note 3)
fRF = 315MHz
fRF = 434MHz
Receiver 315MHz
Receiver 434MHz
Deep-sleep (3V mode)
Deep-sleep (5V mode)
TA < +125°C,
typ at +125°C
(Note 2)
Receiver 315MHz
Receiver 434MHz
Deep-sleep (3V mode)
Deep-sleep (5V mode)
HVIN = 5V, ILOAD = 15mA
4.5
5.0
11.6
12.4
6.4
6.7
0.8
2.4
6.8
7.0
8.0
14.9
3.0
5.5
19.1
20.4
8.4
8.7
8.8
10.9
8.7
8.8
34.2
39.3
V
mA
µA
mA
µA
V
Input-High Threshold
VIH (Note 2)
0.9
x HVIN
V
Input-Low Threshold
Pulldown Sink Current
Output Low Voltage
Output High Voltage
VIL
VOL
VOH
(Note 2)
AGC0-1, AUTOCAL, ENABLE, T/R, DATA
(HVIN = 5.5V)
ISINK = 500µA
ISOURCE = 500µA
0.1
x HVIN
20
0.15
HVIN
- 0.26
V
µA
V
V
2 _______________________________________________________________________________________


Part Number MAX7031
Description ASK Transceiver
Maker Maxim Integrated Products
Total Page 19 Pages
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