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Melexis

TH72031 Datasheet Preview

TH72031 Datasheet

FSK Transmitter

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TH72031
868/915MHz
FSK Transmitter
Features
! Fully integrated PLL-stabilized VCO
! Frequency range from 850 MHz to 930 MHz
! Single-ended RF output
! FSK through crystal pulling allows modulation
from DC to 40 kbit/s
! High FSK deviation possible for wideband data
transmission
! Wide power supply range from 1.95 V to 5.5 V
! Very low standby current
! On-chip low voltage detector
! High over-all frequency accuracy
! FSK deviation and center frequency independ-
ently adjustable
! Adjustable output power range from
-12 dBm to +9.5 dBm
! Adjustable current consumption from
5.1 mA to 13.4 mA
! Conforms to EN 300 220 and similar standards
! 8-pin Small Outline Integrated Circuit (SOIC)
Ordering Information
Part Number
Temperature Code
TH72031
K (-40°C to 125°C)
Package Code
DC (SOIC8)
Delivery Form
98 pc/tube
2500 pc/T&R
Application Examples
! General digital data transmission
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
! Wireless access control
! Alarm and security systems
! Garage door openers
! Remote Controls
! Home and building automation
! Low-power telemetry systems
Pin Description
FSKDTA 1
FSKSW 2
ROI 3
ENTX 4
TH72031
8 VEE
7 OUT
6 VCC
5 PSEL
General Description
The TH72031 FSK transmitter IC is designed for applications in the European 868 MHz industrial-scientific-
medical (ISM) band, according to the EN 300 220 telecommunications standard. It can also be used for any
other system with carrier frequencies ranging from 850 MHz to 930 MHz (e.g. for applications in the US 902
to 928 MHz ISM band).
The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref. The inte-
grated PLL synthesizer ensures that each RF value, ranging from 850 MHz to 930 MHz, can be achieved.
This is done by using a crystal with a reference frequency according to: fref = fc/N, where N = 32 is the PLL
feedback divider ratio.
3901072031
Rev. 008
Page 1 of 20
Data Sheet
June/07




Melexis

TH72031 Datasheet Preview

TH72031 Datasheet

FSK Transmitter

No Preview Available !

TH72031
868/915MHz
FSK Transmitter
Document Content
1 Theory of Operation ...................................................................................................3
1.1 General............................................................................................................................. 3
1.2 Block Diagram .................................................................................................................. 3
2 Functional Description ..............................................................................................4
2.1 Crystal Oscillator .............................................................................................................. 4
2.2 FSK Modulation ................................................................................................................ 4
2.3 Crystal Pulling................................................................................................................... 4
2.4 Output Power Selection.................................................................................................... 5
2.5 Lock Detection.................................................................................................................. 5
2.6 Low Voltage Detection...................................................................................................... 5
2.7 Mode Control Logic .......................................................................................................... 6
2.8 Timing Diagrams .............................................................................................................. 6
3 Pin Definition and Description ..................................................................................7
4 Electrical Characteristics ..........................................................................................8
4.1 Absolute Maximum Ratings .............................................................................................. 8
4.2 Normal Operating Conditions ........................................................................................... 8
4.3 Crystal Parameters ........................................................................................................... 8
4.4 DC Characteristics............................................................................................................ 9
4.5 AC Characteristics .......................................................................................................... 10
4.6 Output Power Steps ....................................................................................................... 10
5 Typical Operating Characteristics ..........................................................................11
5.1 DC Characteristics.......................................................................................................... 11
5.2 AC Characteristics .......................................................................................................... 14
6 Test Circuit ...............................................................................................................17
6.1 Test circuit component list to Fig. 18 .............................................................................. 17
7 Package Description ................................................................................................18
7.1 Soldering Information ..................................................................................................... 18
8 Reliability Information..............................................................................................19
9 ESD Precautions ......................................................................................................19
10 Disclaimer .................................................................................................................20
3901072031
Rev. 008
Page 2 of 20
Data Sheet
June/07


Part Number TH72031
Description FSK Transmitter
Maker Melexis
Total Page 20 Pages
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