UHF Multi Channel Transparent Data Link Transceiver
TDLA2
 

The TDL2A is a 9600baud half-duplex multi channel OEM radio modem in BiM2 footprint, operating on European 433MHz ISM band. TLD2A acts as a transparent serial cable to attached host. TDL2A is an intermediate level OEM radio modem which is in between a raw FM radio module like BiM2 and a sophisticated OEM radio modem like SPM2. It takes care of preamble, synchronisation, bit balancing and error checking along with automatic noise squelching.

Figure 1: TDL2A-433-9
The TDL2A provides a half duplex link. Provided no two devices attempt to transmit simultaneously no further restrictions on data transmission need be made, as all transmit timing, valid data identification and datastream buffering is conducted by the unit. Synchronisation and framing words in the packet prevent the receiver outputting garbage in the absence of wanted RF signal or presence of interference. For multiple radio systems (polled networks) a TDL2A can be set to 1 of 8 unique addresses. As well as having unique addresses, the TDL2A allows operation on one of 5 pre-set frequencies in the 433MHz band. These frequencies are non-overlapping and simultaneous operation of TDL2As in the same area on different channels will be possible. Units are supplied on 433.925MHz (Ch0) as default.
 

Features

  • Conforms to EN 300 220-3 and EN 301 489-3
  • High quality, stable crystal reference
  • Low noise synthesiser / VCO
  • SAW front-end filter
  • Multi-stage ceramic IF filtering
  • Single conversion superhet
  • Serial modem baud rate at 9600bps (half-duplex)
  • Addressable point-to-point
  • 5 serial select wideband channels
  • Data Present indication
  • Available as TDL2T transmitter and TDL2R receiver for one way communication

Applications

  • Handheld / portable terminals
  • PDAs, organisers & laptops
  • Industrial telemetry and telecommand
  • In-building environmental monitoring and control
  • Remote data acquisition system, data logging
  • Fleet management, vehicle data acquisition

Technical Summary

  • Operating frequency: 433.925MHz (default)
  • Modulation: 16kbps bi-phase FSK
  • Supply: 5V at 28mA transmit, 22mA receive/idle
  • Transmit power: +10dBm (10mW)
  • Receiver sensitivity: -107dBm (for 1% BER)
  • 32 byte data buffer
  • Adjacent channel rejection: 65db @ ±320kHz
  • Spurious emission: <-65dBm
  • Receiver Blocking: 84dB