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LMT1-XXX-5 Datasheet(PDF) 3 Page - Radiometrix Ltd

Part # LMT1-XXX-5
Description  VHF Narrow Band FM Low Cost multi channel radio modules
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Manufacturer  RADIOMETRIX [Radiometrix Ltd]
Direct Link  http://www.radiometrix.com
Logo RADIOMETRIX - Radiometrix Ltd

LMT1-XXX-5 Datasheet(HTML) 3 Page - Radiometrix Ltd

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Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 3
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=47k
5a
No pin
Not present in LMT1
1b
P0/PGM
Parallel Channel select LSB
Serial frequency programming / configuration1
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 RS232 datastream applied
to the P0 pin.
2. Channel select inputs have pullups (50k
Ω) to 3v internal rail. Do not exceed 3V logic levels on
this port.
3. Channel select inputs are active low
4. TXE has a 100k
Ω pullup 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 spuri.
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
Figure 3: LMT1 footpint (top view)


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