TH72005_12 Datasheet, PDF (1/20 Pages) Melexis Microelectronic Systems – FSK/ASK Transmitter

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
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
TH72005
315MHz
FSK/ASK Transmitter
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 EN 300 220 and similar standards
10-pin quad flat no lead (QFN) package)
Ordering Code
Product Code Temperature Code
TH72005
K
TH72005
K
Package Code
LD
LD
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
LD for QFN double
RE for Reel, TU for Tube
Ordering example:
TH72005KLD-BAA-000-RE
Application Examples
Tire Pressure Monitoring System (TPMS)
Remote Keyless Entry (RKE)
Automatic Meter Reading (AMR)
Alarm and security systems
Garage door openers
Home and building automation
Low-power telemetry
Wireless access control
Pin Description
ASKDTA
FSKDTA
FSK SW
ROI
EN TX
top view
VCC
VEE
O UT
V EE
PSEL
General Description
The TH72005 FSK/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.
3901072005
Rev. 011
Page 1 of 20
Data Sheet
Jul/12