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LMT1-173-5 Datasheet(PDF) 3 Page - Radiometrix Ltd |
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LMT1-173-5 Datasheet(HTML) 3 Page - Radiometrix Ltd |
3 / 10 page Radiometrix Ltd LMT1/LMR1 Data Sheet page 3 Figure 3: LMT1 footprint (top view) Pin description – LMT1 Pin Name Function 1a Vcc 3.1 – 15V power supply (10mW) 4.1V – 15V power supply (100mW) 2a 0V Ground 3a TXE Transmit Enable (active low) 4a TXD DC coupled input for 3V CMOS logic. Rin=47kΩ See note 10 below for phase modulation (–PM) version 5a No pin Not present in LMT1 1b P0/PGM Parallel Channel select LSB Serial frequency programming / configuration 1 2b P1 Parallel Channel select 3b P2 Parallel Channel select 4b P3 Parallel Channel select MSB 5b No pin Not present in LMT1 Notes: 1. Serial programming is by an inverted, CMOS logic level, 2400 baud UART data stream applied to the P0 pin. 2. Channel select inputs have pull-ups (50kΩ) to 3v internal rail. Do not exceed 3V logic levels on this port. 3. Channel select inputs are active low 4. TXE has a 100kΩ pull-up to Vcc 5. All pins are on an 0.1" grid 6. The pins 5a/b are not present, but are included in footprint for compatibility with other units in this family 7. In the 'off' state a PIN switch open circuits the RF output pin. There are no 'off' state spurii. 8. Unit will operate (with marginally reduced specifications and lower (6-8mW) output power) from a 3.0V rail. This must be well regulated and without noise or ripple, as in this state the unit's internal regulator no longer operates, and provides no supply rejection. 9. 100mW versions should not be run continuously from supply voltages > 9v 10. Phase Modulation (-PM) version LMT1: 2.6V peak-to-peak level 2100Hz sinewave tone via an external 680pF series capacitor will produce FM deviation of 4.2kHz. RF GND TXD LMT 2.6V pk-pk 2100Hz 680pF The external 680pF series capacitor on LMT1 TXD input provides a defined 6dB per octave pre emphasis response, to mimic the behavior of a Phase Modulated transmitter. |
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Similar Description - LMT1-173-5 |
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