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RDA1846 の電気的特性と機能

RDA1846のメーカーはRDAです、この部品の機能は「SINGLE CHIP TRANSCEIVER」です。


製品の詳細 ( Datasheet PDF )

部品番号 RDA1846
部品説明 SINGLE CHIP TRANSCEIVER
メーカ RDA
ロゴ RDA ロゴ 




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RDA1846 Datasheet, RDA1846 PDF,ピン配置, 機能
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.
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RDA1846 pdf, ピン配列
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.
Page 3 of 16
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RDA1846 電子部品, 半導体
RDA Microelectronics, Inc.
RDA1846 SPEC V1.2e
5. Receiver/Transmitter Characteristics
Table 5-1 Receiver Characteristics
(AVDD = 3.3 V, TA = -25 to 85 °C, unless otherwise specified)
SYMBOL
PARAMETER
General specifications
Fin Input Frequency Range1
Input Frequency Range2
Input Frequency Range3
NF Noise Figure
IP3in
Input IP3
SEN
Sensitivity
ACS
IR
Adjacent Channel Selectivity
Image rejection
Blocker
Voice distortion
CONDITIONS
Max RX Gain
Max RX Gain
12.5kHz channel,
12dB SINAD
±12.5KHz
> 1MHz
MIN TYP MAX
UNIT
400
134
200
-10
-125
65
60
3
-6
-124
66
70
85
1.5
520
174
260
0
-123
67
MHz
MHz
MHz
dB
dBm
dBm
dB
dB
dB
%
Table 5-2 Transmit Characteristics
(AVDD = 3.3 V, TA = -25 to 85°C, unless otherwise specified)
SYMBOL
PARAMETER
General specifications
Fout
Output Frequency Range1
Output Frequency Range2
Output Frequency Range3
POUT
Output Power
SINAD/SNR
ACP
Adjacent channel power
Modulation sensitivity
Voice distortion
Modulation limitation
CONDITIONS
1.5kHz frequency offset
MIN
400
134
200
-2
TYP
5
48/53
-67
13
0.5
2.2
MAX
520
174
260
8
2.5
UNIT
MHz
MHz
MHz
dBm
dB
dBc
mV
%
kHz
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.
Page 6 of 16
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共有リンク

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部品番号部品説明メーカ
RDA1845

SINGLE CHIP TRANSCEIVER

RDA
RDA
RDA1846

SINGLE CHIP TRANSCEIVER

RDA
RDA
RDA1846

Programming Guide

RDA
RDA
RDA1846S

SINGLE CHIP TRANSCEIVER

RDA
RDA


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