RDA1846 SINGLE CHIP TRANSCEIVER FOR WALKIE TALKIE Rev.1.2-Dec.2009 GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 NC MIC_IN Cc AVDD NC RFIN AVDD The RDA1846 is a highly integrated single-chip transceiver for Walkie Talkie applications. It totally realizes the translation from RF carrier to voice in the RX path and from voice to RF carrier in the TX path, requiring only one micro controller. AFOUT 1. General Description The RDA1846 has a powerful digital signal processor, which makes it have optimum voice quality, flexible function options, and robust performance under varying reception conditions. The RDA1846 can be tuned to the worldwide frequency band for Walkie Talkie from 400MHz to 500MHz and especially from 134MHz to 174MHz which meets the frequency band of weather broadcast. The transceiver uses the CMOS process with a package size of 5X5mm. By virtue of its high integration, it requires the least external components and eliminates the complicated design of sensitive RF circuits on PCB. Figure 1.1 RDA1846 Top View 1.1 Features CMOS single-chip fully-integrated transceiver DTMF and programmable in-band dual tone Fully integrated frequency synthesizer and VCO Programmable in-band single tone transmitter Support worldwide frequency band Auto RX/TX/SLEEP state switching 134MHz ~ 174MHz 8 GPIOs 400MHz ~ 500MHz 3-wire/4-wire/I2C serial control bus interface 12.5KHz, 25KHz channels On chip 8 dBm PA Support multiple XTAL clocks Analog and digital volume control 12.8/25.6Mhz Directly support 32 resistance loading 13/26Mhz 3.3 to 4.8 V supply voltage with Integrated LDO 5X5 mm 32 pin QFN package Digital auto frequency control (AFC) Digital auto gain control (AGC) Selectable pre/de-emphasis Received signal strength indicator (RSSI) VOX and SQ Cellular handsets Build-in CTCSS/CDCSS generator and judgment Family radio services CTCSS with 120/180 /240 degree phase shift Walkie Talkies 23/24 bit programmable DCS code 1.2 Applications Copyright (c) RDA Microelectronics Inc. 2009. All rights are reserved. The information contained herein is the exclusive property of RDA and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of RDA.