RDA1847

RDA1847

RDA1847
SINGLE CHIP TRANSCEIVER FOR WALKIE TALKIERev.1.0–Aug.2011  
1. General Description
The RDA1847 is a highly integrated single-chip transceiver targeted for both advanced digital modulated and traditional FM modulated Walkie Talkie applications. For digital modulated WT applications such as DMR and dPMR, the RDA1847 accomplishes the downconversion and upconversion between RF and baseband signals. There are both analog and digital interfaces for the IQ baseband signals. One external digital signal processor is required to accomplish the demodulation/modulation. For traditional WT applications, RDA1847 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. The transceiver is integrated with the CMOS process in 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. 1.1 Features z z z z CMOS single-chip fully-integrated transceiver Analog IQ baseband interface McBSP digital IQ baseband interface Support worldwide frequency band ? ? z z 134MHz ~ 174MHz 400MHz ~ 500MHz z z z z z z z z z Build-in CTCSS/CDCSS generator and judgment ? ? CTCSS with 120/180 /240 degree phase shift 23/24 bit programmable DCS code
32 AVDD SCLK SDIO ACAP XTAL1 XTAL2 MODE SENB 1 2 3 4 5 6 7 8 9
31
30
29
28
27
26
25 24 23 DCAP AVDD PABIAS PDN RFON VDDPA RFOP RFOUT
GND PAD
22 21 20 19 18 17
10
11
12
13
14
15
16
Figure 1.1 RDA1847 Top View
Auto RX/TX/SLEEP state switching 8 GPIOs 3-wire/4-wire/I2C serial control bus interface On chip 8 dBm PA Analog and digital volume control Directly support 32? resistance loading 3.3 to 4.8 V supply voltage with Integrated LDO 5X5 mm 32 pin QFN package
12.5KHz, 25KHz channels Support multiple XTAL clocks ? ? 12.8/25.6Mhz 13/26Mhz
z z z z z z z
Digital auto frequency control (AFC) Digital auto gain control (AGC) Selectable pre/de-emphasis Received signal strength indicator (RSSI) VOX and SQ DTMF and programmable in-band dual tone Programmable in-band single tone transmitter
1.2 Applications z z z Cellular handsets Family radio services Walkie Talkies
Copyright ? RDA Microelectronics Inc. 2011. 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.

相关主题
相关文档
最新文档