TLM2-458-5 Datasheet, PDF (3/7 Pages) Radiometrix Ltd – NBFM Multi-channel 500mW UHF Transmitter

Figure 3: TLM2 Footprint (Top) view through can
User Interface
Pin description
Pin
Name
1a
Vcc
2a
0V
3a
TXE
4a
TXD
Function
6-9v DC supply (15v max). 350mA max. current drain
Ground
Transmitter enable. Low = ON, open = off. 100K pullup to raw Vin
DC coupled input for 3V CMOS logic. R_in=47kΩ
1b
P0/PGM
Serial programming / control input (inverted logic level rs232)
2b
P1
3b
P2
4b
P3
'Transmitter in-lock' output (active high)
No connection
Serial output (inverted logic level rs232)
Notes:
1. No 'modem version' is available
2. A version with a simplified (16/32 channel, parallel select) user interface identical to the LMT2, is
available
3. A remote control 'actuator' software version is available, compatible with the LMR2-CX
4. P0 input has a 50K pullup to internal 4v rail
5. An ancillary connector (PGM) is provided to allow direct connection of an RS232 (non-inverted, true
levels) port via a 3 pin 0.1" pitch connector, for limited in-circuit re-programming by PC. This
connector does not provide a 'read back' output.
6. Continuous transmission at input voltages above 9v is not recommended, unless forced air (fan)
cooling is provided. If duty cycle can be kept low, and the length of transmission minimised, then up
to 15v can be used
7. This is a 500mW output product. Good grounding , good quality aerials, properly mounted, and a low
impedance power supply are required if full performance is to be reliably obtained. If feasible, we
recommend mounting the module, and the board it is on, inside a metal enclosure, with the RF
connector exiting through a bulkhead. All signal and power feeds should be filtered and/or
decoupled.
Failure to observe these measures can cause modulation distortion ('recirculation' effects) or
instability. Also be aware of the effect that the strong RF fields generated by this device (and it's
aerial) can have upon other adjacent circuitry if this is not properly screened, filtered or otherwise
protected. Regulators, sensitive analogue circuitry, and microprocessors seem especially
interference prone.
8. This design uses a version of the LMT2 100mW transmitter, and the AFS2 500mW power amplifier
module
Radiometrix Ltd
TLM2 Data Sheet
page 3