vishay rfwaves RFW122-m-pa ism document number 84776 rev. 1.1, 12-dec-05 www.vishay.com 1 195 8 1 for more information please c ontact: rftransceivers@vishay.com RFW122-m-pa ism transceiver module with power amplifier description the RFW122-m-pa is a small pcb module which includes the RFW122-m module, besed on vishay rfwaves* RFW122 transceiver chipset, and a power amplifier module. this module was created in order to provide a solution for applications that have a need of longer range than provided by the basic RFW122-m module. the company?s products are covered by one or more of the following: taiwan patent no. 155994, taiwan patent no. 176767, usa patent no. 6,535,545. other patents pending the module consists of 2 main parts: 1 . r f w 1 2 2 - m m o d u l e - b a s e d o n v i s h a y r f w a v e s RFW122 transceiver chipset 2. carrier board which includes: ? pa chip - a half-duplex rf power amplifier module on chip with internal antenna diversity support ? a 9 pin application header for main board connection ? tx/rx switch ? 2 rf output ports ? rf saw filter * vishay advanced technologies ltd. - rfwaves division (*) this power consumption is under 1 mbps, 50 % ?1? and 50 % ?0? characteristics parameter value basic transceiver RFW122-m, 1 mbps, dsss. typical output power 25 dbm peak typical receive sensitivity - 73 dbm peak typical total link budget 97 db typical current consumption in transmit (tx) mode (*) 210 ma typical current consumption in receive (rx) mode 35 ma averange current consumption depending on application (u sually much lower than peak due to time sharing between tx, rx and standby) typical standby current consumption < 100 ua antenna diversity two antenna ports and an externally controlled switch, allowing the application to decide which antenn a is active (space diversity implementation) antenna switch time typical < 1 usec antenna impedance 50 ohm unbalanced antenna mechanical interface pads for soldering mmc x connectors or mechani cal holes for direct soldering of coaxial cable. note : no cable or connector is provided with the module. main board interface 9 pin, 2 mm pitch, 1.2 mm diameter. module dimensions (without antenna) 45 x 21 mm carrier pcb thickness 0.6 mm total module thickness 5 mm
www.vishay.com 2 document number 84776 rev. 1.1, 12-dec-05 vishay rfwaves RFW122-m-pa ism for more information please c ontact: rftransceivers@vishay.com block diagram: the following table describes the pin out of the RFW122-m-pa. the module has a 9-pin interface towards the main board. see drawing at ?mechanical dimensions? section to identify pin 1 and antenna ports. l antenna port 1 antenna port 2 rf w 122-m v cc g n d rf act rf data i/o rf tx/rx a n t s w rf - tx 9 pin header rssi po w er amplifier sa w filter rf- rx txrx s w itch carrier pcb lookup antenna port 1 195 8 2 pinout 1 rf tx/rx transmit receive control. high = tx; low = rx see RFW122-m datasheet for more details. note : rf tx/rx controls also the pa state. for low current standby mode this control should be pulled low. 2 rssi rf rssi indication see RFW122-m datasheet for more details. max source and sinc current = 50 na 3 data i/o rf input / output data. see RFW122-m datasheet for more details. 4 rf act rf activate module control. high = active; low = non active see RFW122-m datasheet for more details. 5 gnd ground signal 6 vcc3 feed input voltage, 3 - 3.6 v; peak current 200 ma. recommended 3.4 v for optimal performance. note : voltage should be regulated - recommended th at ripple in peak current will not exceed 50 mv peak/peak. 7 nc not connected 8 nc not connected 9 ant sw rf switch control ant sw tx rx high vcc - 0.6 v antenna port 1 antenna port 2 low 0.6 v antenna port 2 antenna port 1 note: for low current standby mode this control should be pulled low.
document number 84776 rev. 1.1, 12-dec-05 www.vishay.com 3 vishay rfwaves RFW122-m-pa ism for more information please c ontact: rftransceivers@vishay.com design considerations RFW122-m-pa carrier board has been designed espe- cially in order to accommodate the RFW122-m module and the pa module, and provide optimal rf perfor- mance and minimal size. the layout has been carefully designed in order to preven t oscillaltion and rf leakage phenomena. when connecting this module to the main board, it is recommended to follow these guidelines: 1. when connecting the antenna/s using a coaxial cable, make sure the cable has 50 ohm impedance with low loss at 2.44 ghz (loss < 2 db/m). in addition, the soldering quality is cr itical for optimal power transmission. make sure the cable ground is well sol- dered in at least two points. also, make sure that the coaxial cable exposure leng th is lower than 3 mm. 2. the antenna/s should be placed in a distance of least 3 cm from the module. 3. the antenna should be tuned to 50 ohm at 2.44 ghz. 4. for antenna diversity implementation, the optimal distance between the two antennas depends on the antenna type and orientation. 5. dc system should be able to support high current bursts of up to 250 ma for switched tx mode. the vcc and ground should remain stable (ripple < 50 mv) or else the module sensitivity can be reduced, and interference can be caused to the rest of the sys- tem. it is advised to use a separate regulator for the rf section connected directly to the voltage source and ground, and to avoid using the same voltage supply and ground connection that is used by the rest of the system. 6. shielding - the module is designed to support a metal shield can. the can is not provided with the module. mechanical dimensions in millimeters *note: pins are numbered 1 - 9. please refer to the pin out table on page 2 for pin description. notice specifications of the products displayed herein are sub- ject to change without notice. vishay intertechnology, inc., or anyone one its behalf , assumes no responsibility or liability for any erro rs or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in vishay?s terms and conditions of sale for such prod- ucts, vishay assumes no lia bility whatsoev er, and dis- claims any express or implied warranty, relating to sale and/or use of vishay produc ts including liability or war- ranties relating to fitness for a particular purpose, mer- chantability, or infringement of any patent, copyright, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. cus- tomers using or selling thes e products for use in such applications do so at their own risk and agree to fully indemnify vishay for any damages resulting from such improper use or sale. footprint 39.1 39.1 20.7 10.3 7.5 7.5 1.6 1.4 0.5 2.4 rf w 122 - m 2.0 5. 8 6.6 2.1 0 . 5 2 .4 0 . 5 0 2 . 4 1 2 3 4 5 6 7 8 9 1.30 3.50 1.0 0 . 6 0.6 44.4 antenna port pad antenna port hole 1.4 1.2 interface pin hole 1.5 0.3 5.3 2.7 12.9 5.9 8 .2 195 8 3
legal disclaimer notice vishay document number: 91000 www.vishay.com revision: 08-apr-05 1 notice specifications of the products displayed herein are subjec t to change without notice. vishay intertechnology, inc., or anyone on its behalf, assume s no responsibility or liability fo r any errors or inaccuracies. information contained herein is intended to provide a product description only. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in vishay's terms and conditions of sale for such products, vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and /or use of vishay products including liab ility or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyrigh t, or other intellectual property right. the products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify vishay for any damages resulting from such improper use or sale.
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