RX2A-433-10

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com nd Issue 1, 2 August 2012 TX2A/RX2A UHF FM Data Transmitter and Receiver Modules The TX2A and RX2A data link modules are a miniature PCB mounting UHF radio transmitter and receiver pair which enable the simple implementation of a data link at up to 64 kbps at distances up to 75 metres in-building and 300 metres open ground. Features CE certified by independent Notified Body Verified to comply with harmonised radio standard EN 300 Fig 1: TX2A-433-64 & RX2A-433-64 220-3 and EMC standard EN 301 489-3 by accredited Test Laboratory Data rates up to 64 kbps Usable range up to 300 m Versions available on 433.92MHz and 434.42MHz Fully screened Available for operation at 433.92MHz or 434.42MHz in the UK and Europe, both modules combine full screening with extensive internal filtering to ensure EMC compliance by minimising spurious radiations and susceptibilities. The TX2A and RX2A modules will suit one-to-one and multi-node wireless links in applications including car and building security, EPOS and inventory tracking, remote industrial process monitoring and computer networking. 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. Technical Summary Transmitter - TX2A Crystal-locked PLL, FM modulated at up to 64 Kbps Operation from 2.2V to 16V (Dependent on version) +10dBm on 433.92MHz High efficiency, >30%, DC to RF Improved frequency and deviation accuracy 2nd harmonic, > -60dBc Receiver - RX2A Single conversion FM superhet SAW front end filter gives >50dB image rejection Operation from 2.7V to 16V 12mA Built-in regulator for improved stability and supply noise rejection -101dBm sensitivity 1ppm BER, 64kb/s version -108dBm sensitivity 1ppm BER, 10kb/s version RSSI output with 60dB range Extremely low LO leakage, <-100dBm Evaluation platforms: UNI-EVAL, NBEK+SIL carrier Radiometrix Ltd, TX2A/RX2A Data Sheet page 1 Functional description The TX2A transmitter module is a crystal based PLL controlled FM transmitter operating between 2.2V and 16V and is available in 433.92MHz. The TX2A module is type approved to EN 300 220-3 for European use and delivers nominally +10dBm at 11mA. The module measures 32 x 12 x 3.8 mm. The RX2A 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 10mA when receiving. The RX2A 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 RX2A measures 48 x 17.5 x 4.5 mm excluding the pins. TX2A transmitter supply 5 regulator 2.2 -- 16V 4 En 433.92 MHz band pass ref 35kHz buffer 32 filter 2 osc LPF RF out V C O 7 TXD Loop 3 Filter RF gnd 6 1 0V Fig. 2: TX2A block diagram 3.8 mm 32 mm Pin description RF GND (pins 1&3) 12.0 12.5 mm mm RF ground, internally connected to the module Radiometrix TX2A screen and pin 6 (0V). These pins should be directly connected to the RF return path - e.g. coax braid, main PCB ground plane etc. PCB level RF OUT (pin 2) 1 = RF GND 15.24 mm 50 RF output to the antenna. Internally DC- 2 = RF OUT 3 = RF GND isolated. See antenna section of apps notes for 1 2 3 4 5 6 7 4 = En details of suitable antennas. 5 = Vcc 6 = 0V 7 = TXD En (pin 4) 7 holes, 0.7 mm dia, pin spacing 2.54 mm Tx enable. <0.15V shuts down module (current <1A). >1.7V enables the transmitter. Fig 3: TX2A physical dimensions Impedance ~1M. Observe slew rate requirements (see apps notes). Vcc (pin 5) +2.2V to +16V DC supply. Max ripple content 0.1V . Decoupling is not generally required. P-P 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). Notes: 1. The 3V and 5V supply variant TX2As intended for direct replacement to our SAW based TX2 modules and do not have internal regulator. They also have identical pin out as of TX2, hence lack pin 3 (GND) and pin 4 (Enable). 2. The TXD input of 3V and 5V versions require serial digital data at 0-Vcc levels. i.e. 0-3V and 0-5V respectively Radiometrix Ltd, TX2A/RX2A Data Sheet page 2