TH72002_12 Datasheet, PDF (1/20 Pages) Melexis Microelectronic Systems – ASK Transmitter

Features
Fully integrated PLL-stabilized VCO
Frequency range from 290 MHz to 350 MHz
Single-ended RF output
ASK achieved by on/off keying of internal
power amplifier up to 40 kbit/s
Wide power supply range from 1.95 V to 5.5 V
Very low standby current
On-chip low voltage detector
TH72002
315MHz
ASK Transmitter
High over-all frequency accuracy
Adjustable output power range from
-12 dBm to +11 dBm
Adjustable current consumption from
3.2 mA to 10.3 mA
Conforms to EN 300 220 and similar standards
8-pin Small Outline Integrated Circuit (SOIC)
Ordering Code
Product Code Temperature Code
TH72002
K
TH72002
K
Package Code
DC
DC
Option Code
BAA-000
BAA-000
Packing Form Code
RE
TU
Legend:
Temperature Code:
Package Code:
Packing Form:
K for Temperature Range -40°C to 125°C
DC for SOIC
RE for Reel, TU for Tube
Ordering example:
TH72002KDC-BAA-000-RE
Application Examples
General digital data transmission
Tire Pressure Monitoring System (TPMS)
Remote Keyless Entry (RKE)
Low-power telemetry
Alarm and security systems
Garage door openers
Home automation
Pin Description
ASKDTA 1
n. c. 2
ROI ³
ENTX 4
TH72002
8 VEE
7 OUT
6 VCC
5 PSEL
General Description
The TH72002 ASK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical
(ISM) band. It can also be used for any other system with carrier frequencies ranging
from 290 MHz to 350 MHz.
The transmitter's carrier frequency f_c is determined by the frequency of the reference crystal f_ref. The
integrated PLL synthesizer ensures that each RF value, ranging from 290 MHz to 350 MHz, can be achieved
by using a crystal with a reference frequency according to: f_ref = f_c/N, where N = 32 is the PLL feedback
divider ratio.
3901072002
Rev. 010
Page 1 of 20
Data Sheet
Jun/12