Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 Issue 1, 01 November 2004 TX3A & RX3A UHF FM Data Transmitter and Receiver Modules European versions: TX3A-869-64/RX3A-869-xx USA versions: TX3A-914-64/RX3A-914-xx Data speed options (-xx) : -10 (10kbps), -64 (64kbps) The TX3A & RX3A are miniature UHF radio transmitter & receiver modules d esigned for PCB mounting. They facilitate the simple implementation of data links at speeds up to 64kbps and distances up to 75m in-building or 300m over open ground. TX3A Transmitter RX3A Receiver Features: Frequencies available as standard: 869.85MHz, 914.5MHz CE certified by independent Notified Body Verified to comply with Radio standard EN 300 220-3 by accredited Test Laboratory Verified to comply with EMC standard EN 301 489-3 by accredited Test Laboratory North American version conforms to FCC part 15.249 Data rates up to 64kbps Fully screened Available for operation in the 868-870MHz band in Europe and the 902928MHz band in North America, both modules combine full screening with internal filtering to ensure EMC compliance by minimising spurious radiation and susceptibility. The TX3A & RX3A will suit one-to-one and multi-node wireless links in such applications as car and building security, EPOS and inventory tracking, remote industrial process monitoring and data networks. Because of their small size and low power requirements, both modules are ideal for use in portable, battery-powered applications such as hand-held terminals. Transmitter TX3A Crystal-locked PLL, FM modulated at up to 64 kb/s Operation from 2.2V to 16V 7.5mA Built-in regulator for improved stability and supply noise rejection 1mW nominal RF output Enable facility Receiver RX3A Single conversion FM superhet with SAW front end filter Operation from 2.7V to 16V 11mA Built-in regulator for improved stability and supply noise rejection -100dBm sensitivity 1ppm BER, 64kb/s version -107dBm sensitivity 1ppm BER, 10kb/s version RSSI output with 60dB range Enable facility Extremely low LO leakage, -120dBm typical Radiometrix Ltd, TX3A & RX3A Data Sheet page 1 Functional description The TX3A transmitter module uses a frequency modulated crystal-locked PLL and operates between 2.2V and 16V at a current of 7.5mA nominal. At 3V supply it delivers nominally 0dBm (1mW) RF output. The SIL style TX3A measures 32 x 12 x 3.8 mm, excluding pins. The RX3A module is a single conversion FM superhet receiver capable of handling data rates of up to 64kbps. It will operate from a supply of 2.7V to 16V and draws 11mA when receiving. The RX3 features a fast power-up time for effective duty cycle power saving and a signal strength (RSSI) output with 60dB of range. Full screening and a SAW front-end filter give good immunity to interference. The SIL style RX3A measures 48 x 17.5 x 4.5 mm, excluding pins. TX3A transmitter supply 5 regulator 2.2 -- 12V 4 En 868/915 MHz band pass ref 35kHz buffer 64 filter 2 osc LPF V C O 7 RF out TXD Loop 3 Filter RF gnd 1 6 0V Fig 1 :TX3A block diagram Pin description RF GND (pins 1&3) 3.8 mm 32 mm RF ground, internally connected to the module screen and pin 6 (0V). These pins should be directly connected to the 12.0 12.5 mm mm RF return path - e.g. coax braid, main Radiometrix TX3A PCB ground plane etc. RF OUT (pin 2) 50 RF output to the antenna. PCB level Internally DC-isolated. See antenna 1 = RF GND 15.24 mm 2 = RF OUT section of apps notes for details of 3 = RF GND suitable antennas. 1 2 3 4 5 6 7 4 = En 5 = Vcc En (pin 4) 6 = 0V 7 = TXD Tx enable. <0.15V shuts down module (current <1 A). >1.7V enables the 7 holes, 0.7 mm dia, pin spacing 2.54 mm transmitter. Impedance ~1M . Observe Fig2: TX3A physical dimensions slew rate requirements (see apps notes). Vcc (pin 5) +2.2V to +16V DC supply. Max ripple content 0.1VP-P. Decoupling is not generally required. 0V (pin 6) DC supply ground. Internally connected to pins 1 & 3 and module screen. TXD (pin 7) DC-coupled modulation input. Accepts serial digital data at 0V to 2.5V levels. See applications notes for suggested drive methods. Input is high impedance (>100k ). Radiometrix Ltd, TX3A & RX3A Data Sheet page 2