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LMT2-433-5 Datasheet(PDF) 5 Page - Radiometrix Ltd

Part No. LMT2-433-5
Description  UHF Narrow Band FM Low Cost multi channel
Download  11 Pages
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Maker  RADIOMETRIX [Radiometrix Ltd]
Homepage  http://www.radiometrix.com
Logo RADIOMETRIX - Radiometrix Ltd

LMT2-433-5 Datasheet(HTML) 5 Page - Radiometrix Ltd

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Radiometrix Ltd
LMT2/LMR2 Data Sheet
page 5
Figure 5: LMR2 footpint (top view)
Pin description – LMR2
Pin
Name
Function
1a
Vcc
3.1 – 15V power supply
2a
0V
Ground
3a
RXE
Receiver Enable (active high)
4a
RXD
Data out (open collector, no pullup)
5a
AF out
700mV p-p audio. DC coupled, approx 0.8v bias.`
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
RSSI
DC level between 0.5v and 2.2v. 60dB dynamic range
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 (50kΩ) to 3v internal rail. Do not exceed 3v logic levels on this
port.
3.
Channel select inputs are active low
4.
All pins are on an 0.1" grid
5.
Data recovery circuit used for RXD is not a simple 'average and compare' type. It is a peak sampling
quasi-DC coupled design, allowing a greater than usual flexibility in data format.
6.
Unit will operate (with marginally reduced specifications) 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.


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