EVB72005-315-FSK-C Melexis

EVB72005 315MHz FSK/ASK Transmitter Evaluation Board Description Features Application Examples Fully integrated PLL-stabilized VCO General digital data transmission Frequency range from 290 MHz to 350 Tire Pressure Monitoring Systems MHz (TPMS) Single-ended RF output Remote Keyless Entry (RKE) FSK through crystal pulling allows Wireless access control modulation from DC to 40 kbit/s Alarm and security systems High FSK deviation possible for Garage door openers wideband data transmission Remote Controls ASK achieved by on/off keying of Home and building automation internal Low-power telemetry systems power amplifier up to 40 kbit/s Wide power supply range from 1.95 V Evaluation board example 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 (at connector board) Adjustable effective radiated power (ERP) range from -31 dBm to -8 dBm (at antenna board) Adjustable current consumption from 3.2 mA to 10.3 mA Conforms to FCC part 15 and similar standards Ordering information Part No. (see paragraph 6) EVB72005-315-FSK-A EVB72005-315-FSK-C (on request) Note 1: EVB default population is FSK, ASK modifications according to section 3.1 and 4.1. Note 2: EVB72005 is applicable for devices TH72005, TH72001 and TH72002. General Description The TH72005 evaluation board is designed to demonstrate the performance of the transmitter IC with an on-board loop antenna. This board allows the user to setup an RF transmitter very easily. Alternatively a 50 Ohm connector board can be requested. REVISION 007 - JUNE 19, 2017 390127200501 EVB72005 315MHz FSK/ASK Transmitter Evaluation Board Description Contents Features ..................................................................................................................................................... 1 Application Examples ................................................................................................................................. 1 Evaluation board example .......................................................................................................................... 1 Ordering information ................................................................................................................................. 1 General Description ................................................................................................................................... 1 Contents .................................................................................................................................................... 2 1. Theory of Operation ............................................................................................................................... 4 1.1. General................................................................................................................................................ 4 1.2. Block Diagram ..................................................................................................................................... 4 2. Functional Description ........................................................................................................................... 4 2.1. Crystal Oscillator ................................................................................................................................. 4 2.2. FSK Modulation .................................................................................................................................. 5 2.3. Crystal Pulling ..................................................................................................................................... 5 2.4. ASK Modulation .................................................................................................................................. 6 2.5. Output Power Selection ..................................................................................................................... 6 2.6. Lock Detection .................................................................................................................................... 6 2.7. Low Voltage Detection ....................................................................................................................... 6 2.8. Mode Control Logic ............................................................................................................................ 7 2.9. Timing Diagrams ................................................................................................................................. 7 3. Antenna Board Circuit Diagram .............................................................................................................. 8 3.1. Board Component Values to Fig. 6 .................................................................................................... 8 3.2. Antenna Board PCB Top View ............................................................................................................ 9 3.3. Board Connection ............................................................................................................................... 9 4. 50 Connector Board Circuit Diagram ................................................................................................. 10 4.1. Board Component Values to Fig. 7 .................................................................................................. 10 4.2. 50 Connector Board PCB Top View .............................................................................................. 11 4.3. Board Connection ............................................................................................................................. 11 5. Evaluation Board Layouts ..................................................................................................................... 12 5.1. Antenna Board .................................................................................................................................. 12 5.2. PCB Loop Antenna Dimensions ....................................................................................................... 12 5.3. Connector Board .............................................................................................................................. 13 6. Board Variants ...................................................................................................................................... 13 Page 2 of 15 REVISION 007 - JUNE 19, 2017 390127200501