Document
TH72005
315MHz 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
! 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 ! 10-pin Quad Flat No-Lead Package (QFN)
Ordering Information
Part Number
Temperature Code
TH72005
K (-40 °C to 125 °C)
Package Code LD (10L QFN 3x3 Dual)
Delivery Form
120 pc/tray 5000 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
ASKDTA FSKDTA FSKSW
ROI ENTX
top
TH72005
VCC VEE OUT VEE PSEL
bottom
10 1 92 83 74 65
General Description
The TH72005 FSK/ASK transmitter IC is designed for applications in the 315 MHz industrial-scientificmedical (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 fc is determined by the frequency of the reference crystal fref. The integrated PLL synthesizer ensures that carrier frequencies, 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.
39010 72005 Rev. 008
Page 1 of 20
Data Sheet June/07
TH72005
315MHz FSK/ASK Transmitter
Document Content
1 Theory of Operation ...................................................................................................3
1.1 General ............................................................................................................................ 3 1.2 Block Diagram ................................................................................................................. 3
2 Functional Description ..............................................................................................3
2.1 Crystal Oscillator.............................................................................................................. 3 2.2 FSK Modulation ............................................................................................................... 4 2.3 Crystal Pulling.................................................................................................................. 4 2.4 ASK Modulation ............................................................................................................... 5 2.5 Output Power Selection ................................................................................................... 5 2.6 Lock Detection ................................................................................................................. 5 2.7 Low Voltage Detection..................................................................................................... 5 2.8 Mode Control Logic.......................................................................................................... 6 2.9 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 Characterist.