CHIP TRANSCEIVER. RDA1846 Datasheet

RDA1846 TRANSCEIVER. Datasheet pdf. Equivalent

RDA1846 Datasheet
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Part RDA1846
Description SINGLE CHIP TRANSCEIVER
Feature RDA1846; RDA1846 SINGLE CHIP TRANSCEIVER FOR WALKIE TALKIE Rev.1.2–Dec.2009 1. General Description The RDA1.
Manufacture RDA
Datasheet
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RDA RDA1846
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
Figure 1.1 RDA1846 Top View
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 32resistance 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
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.



RDA RDA1846
2. Table of Contents
1. General Description ....................................................................................................................................1
1.1
Features ........................................................................................................................................ 1
1.2
Applications .................................................................................................................................1
2. Table of Contents.........................................................................................................................................2
3. Functional Description................................................................................................................................3
3.1
RF input and output .......................................................................................................................3
3.2
Voice input and output................................................................................................................4
3.3
Synthesizer ...................................................................................................................................4
3.4
XTAL Clock .................................................................................................................................4
3.5
DSP functions...............................................................................................................................4
3.6
Integrated LDO ...........................................................................................................................4
3.7
Serial Control Interface ..............................................................................................................4
4. Electrical Characteristics ...........................................................................................................................5
5. Receiver/Transmitter Characteristics .......................................................................................................6
6. Control Interface Characteristics ..............................................................................................................7
7. Pins Description...........................................................................................................................................8
8. Application Diagram................................................................................................................................. 11
9. Package Outline.........................................................................................................................................12
10. Solder Mounting Condition......................................................................................................................13
11. Change List................................................................................................................................................16
12. Contact Information .................................................................................................................................16
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.



RDA RDA1846
RDA Microelectronics, Inc.
3. Functional Description
RDA1846 SPEC V1.2e
Figure 3.1 RDA1846 Block Diagram
The RDA1846 transceiver features very low solution cost and reduced complexity. As shown in Fig.3.1, to
totally complete the translation from RF carrier to voice in the RX path and from voice to RF carrier in the
TX path, the chip integrates nearly all the functional blocks including RF and base band analog blocks
and digital signal processor. It requires only one micro controller and a few external components to
realize a walkie-talkie.
A powerful integrated DSP accomplishes both the demodulation and modulation of the FM signal.
Besides, standard walkie-talkie features such as CTS, CDS, VOX and SQ etc. are provided through the 8
GPIOs of the chip. Especially, by virtue of the state-of-the-art CMOS technology advanced algorithms
such as AFC, AGC, RSSI and SNR calculations are realized in the DSP, which guarantees the high
receiving and transmitting quality while still consumes a low power. Flexible RX/TX/SLEEP auto switching
function from the DSP further reduces the average power consumptions.
LDOs are also integrated in the chip which further reduces the BOMs.
All interface pins of the chip will be shortly explained below. For details, refer to the ‘RDA 1846
programming guide’.
3.1 RF input and output
The chip can receive and transmit RF signals from 400 to 500MHz and from 134 to 174MHz which cover
most of the walkie-talkie frequency bands around the world and the weather broadcast band. For the RF
input, a direct-in connection from the antenna to the LNA input pin through a switch is suggested which
means no input impedance matching is needed for the receive band. For the RF out, a pa diver can
deliver no more than 8 dBm power to PA. PA bias voltage from 1.5V~2.8V for the power amplifier can be
supplied from the PABIAS pin.
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.
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