Automotive ICs Hall ICs Intelligent Drivers
and Actuators Silicon MEMS CMOS Imaging Bus ICs IR Temperature
RF&RFID
TH72001
315MHz FSK Transmitter
The TH72001 FSK transmitter IC is designed for applica-
tions in the 315 MHz industrial-scientific-medical (ISM)
band. It can also be used for any other system with car-
rier frequencies ranging from 290 MHz to 350 MHz.
The transmitter's carrier frequency fc is determined by
the frequency of the reference crystal fref. The integrated
PLL synthesizer ensures that each RF value, ranging from
290 MHz to 350 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.
Features
• Fully integrated PLL-stabilized VCO
• Frequency range from 290 MHz to 350 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
• Wide operating temperature range from –40° C to 125° C
• Very low standby current
• On-chip low voltage detector
• High over-all frequency accuracy
• FSK deviation and center frequency independently adjustable
• Adjustable output power range from -12 dBm to +11 dBm
• Adjustable current consumption from 3.2 mA to 10.3 mA
• Conforms to FCC part 15 and similar standards
• 8-pin Small Outline Integrated Circuit (SOIC8)
Automotive ICs Hall ICs
Intelligent Drivers
and Actuators
Silicon MEMS CMOS Imaging Bus ICs IR Temperature RF&RFID
Disclaimer:
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and
prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use
in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-
support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be
correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss
of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering of technical or other services. © 2006 Melexis NV. All rights reserved.
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For additional information go to our website at:
Block Diagram with external Components
Applications
• General digital data transmission
• Tire Pressure Monitoring Systems (TPMS)
• Remote Keyless Entry (RKE)
• Low-power telemetry systems
• Home and building automation
• Alarm and security systems
• Garage door openers
• Remote controls
Application Circuit
Feb 2007
CX1
FSKDTA
antenna
matching
network
VEE
XOSC low
voltage
detector
PA
XBUF
V
CO
PLL
CP
PFD
32
OUT
PSEL
RP
S
FSKSW
ROI
XTAL
CX2
8
1
5
3
2
mode
control
ENTX
4
6
VCC
7
PCB loop antenna
OUT
VEE
VCC
PSEL
ENTX
FSKDTA
FSKSW
ROI
1234
8765
FSK data
V
CC
XTAL
CX2
CX1
RPS
CB1
CM1 CM2
LM1
LM2
