Copyright © 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.
RDA1846
SINGLE CHIP TRANSCEIVER FOR WALKIE TALKIE Rev.1.2–Dec.2009
1. General Description
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.
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.
1.1 Features
CMOS single-chip fully-integrated transceiver
Fully integrated frequency synthesizer and VCO
Support worldwide frequency band
134MHz ~ 174MHz
400MHz ~ 500MHz
12.5KHz, 25KHz channels
Support multiple XTAL clocks
12.8/25.6Mhz
13/26Mhz
Digital auto frequency control (AFC)
Digital auto gain control (AGC)
Selectable pre/de-emphasis
Received signal strength indicator (RSSI)
VOX and SQ
Build-in CTCSS/CDCSS generator and judgment
CTCSS with 120/180 /240 degree phase shift
23/24 bit programmable DCS code
DTMF and programmable in-band dual tone
Programmable in-band single tone transmitter
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 32Ω resistance loading
3.3 to 4.8 V supply voltage with Integrated LDO
5X5 mm 32 pin QFN package
1.2 Applications
Cellular handsets
Family radio services
Walkie Talkies
AFOUT
NC
MIC_IN
AVDD
NC
RFIN
AVDD
Cc
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
Figure 1.1 RDA1846 Top View
