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1、 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

2、Rev.1.2Dec.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

3、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 174

4、MHz 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-ch

5、ip 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/d

6、e-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

7、 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 1.2 Applications Cellular handsets Family radio services Walkie Talkies AFOUT NC

8、 MIC_IN AVDD NC RFIN AVDD Cc GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 Figure 1.1 RDA1846 Top View 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 whol

9、e or in part without prior written permission of RDA. 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 I

10、ntegrated 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 Info

11、rmation.16 RDA Microelectronics, Inc. RDA1846 SPEC V1.2e 3. Functional Description Antana Switch 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 R

12、X 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 ac

13、complishes 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

14、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 th

15、e 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 th

16、e 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

17、voltage from 1.5V2.8V 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 RDA Microelectronics,

18、Inc. RDA1846 SPEC V1.2e 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 4 of 16 3.2 Voice input and output In the RX path, the voice signal after demodulation is

19、 sent to the internal DAC which can directly drive a 32 resistance loading through AC coupling. In the TX path, microphone signal can be sent into the chip through AC coupling capacitors. 3.3 Synthesizer The frequency synthesizer generates the local oscillator signal. All building blocks are fully i

20、ntegrated without any external components. LO frequency can be programmed through the serial interface by the MCU. (How to select frequency band and program LO frequency, refer to the programming guide) 3.4 XTAL Clock The RDA1846 supports XTAL clocks such as 12.8 MHz, 13 MHz, 25.6 MHz and 26 MHz. Th

21、e internal XTAL oscillator can also be bypassed thus TCXO clock with appropriate amplitude can be sent into the chip directly. (How to configure the internal XTAL oscillator, refer to the programming guide) 3.5 DSP functions The DSP accomplishes the demodulation and modulation of the FM signal. Stan

22、dard walkie-talkie features such as CTS, CDS, VOX and SQ etc. are provided through the 8 GPIOs. (How to configure the GPIOs, refer to the programming guide) 3.6 Integrated LDO LDOs are integrated on chip which eliminates using one LDO chip on the PCB. Supply voltage for the chip is suggested to be w

23、ithin 3.3V4.8V. A common share of the supply voltage for RDA1846 and other chips or on board circuits are not appropriate and thus not recommended. 3.7 Serial Control Interface A 3-wire/4-wire/I2C serial interface is provided for host IC to read and write RDA1846 control registers. (For details of t

24、he serial control interface, refer to the programming guide). RDA Microelectronics, Inc. RDA1846 SPEC V1.2e 4. Electrical Characteristics Table 4-1 DC Electrical Specification (Recommended Operation Conditions): SYMBOL DESCRIPTION MIN TYP MAX UNIT AVDD Supply Voltage from battery or LDO 3.3 3.3 4.8

25、V Tamb Ambient Temperature -25 27 +85 VL CMOS Low Level Input/output Voltage 0 0.3 V VH CMOS High Level Input/output Voltage 2.7 3 V VTH CMOS Threshold Voltage 1.5 V Table 4-2 DC Electrical Specification (Absolute Maximum Ratings): SYMBOL DESCRIPTION MIN TYP MAX UNIT Tamb Ambient Temperature -40 +90

26、 C IIN Input Current -10 +10 mA VIN Input Voltage -0.3 3.3 V Vlna LNA Input Level +10 dBm Table 4-3 Power consumption specification (AVDD = 3.3 V, TA = -25 to 85, unless otherwise specified) STATE DESCRIPTION Condition TYP UNIT IRx Continue Receive RXON=1,PDN=1 55 mA ITx Continue Transmit TXON=1,PDN

27、=1 50 mA Isleep Deep sleep PDN=0 40 A 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 5 of 16 RDA Microelectronics, Inc. RDA1846 SPEC V1.2e The information conta

28、ined 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 5. Receiver/Transmitter Characteristics Table 5-1 Receiver Characteristics (AVDD = 3.3 V, TA = -25 to 85 C, unless otherwise s

29、pecified) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT General specifications Fin Input Frequency Range1 400 520 MHz Input Frequency Range2 134 174 MHz Input Frequency Range3 200 260 MHz NF Noise Figure Max RX Gain 3 dB IP3in Input IP3 Max RX Gain -10 -6 0 dBm SEN Sensitivity 12.5kHz channel, 12dB S

30、INAD -125 -124 -123 dBm ACS Adjacent Channel Selectivity 12.5KHz 65 66 67 dB IR Image rejection 60 70 dB Blocker 1MHz 85 dB Voice distortion 1.5 % Table 5-2 Transmit Characteristics (AVDD = 3.3 V, TA = -25 to 85C, unless otherwise specified) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT General speci

31、fications Fout Output Frequency Range1 400 520 MHz Output Frequency Range2 134 174 MHz Output Frequency Range3 200 260 MHz POUT Output Power -2 5 8 dBm SINAD/SNR 48/53 dB ACP Adjacent channel power -67 dBc Modulation sensitivity 1.5kHz frequency offset 13 mV Voice distortion 0.5 % Modulation limitat

32、ion 2.2 2.5 kHz RDA Microelectronics, Inc. RDA1846 SPEC V1.2e 6. Control Interface Characteristics Refer to the RDA1846 programming guide. 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 writte

33、n permission of RDA. Page 7 of 16 RDA Microelectronics, Inc. RDA1846 SPEC V1.2e 7. Pins Description Figure 7.1 RDA1846 Top View 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 permissio

34、n of RDA. Page 8 of 16 RDA Microelectronics, Inc. RDA1846 SPEC V1.2e Table 7-1 RDA1846 Pins Description SYMBOL PIN DESCRIPTION AVDD 1 Power supply SCLK 2 Clock input for serial control bus SDIO 3 Data input/output for serial control bus AVDD 4 Power supply XTAL1 5 Oscillator pin 1 XTAL2 6 Oscillator

35、 pin 2 MODE 7 Control Interface select When MODE = VL, I2C Interface is select When MODE = VH, SPI Interface is select SENB 8 Latch enable (active low) input for serial control bus AFOUT 9 Audio signal output to speaker NC* 10 No connection MIC_IN 11 MIC input Cc 12 Compensation capacitor connection

36、 pin AVDD 13 Power supply NC* 14 No connection RFIN 15 RF signal input AVDD 16 Power supply NC* 17 No connection RFOUT 18 RF signal output NC* 19 No connection NC* 20 No connection AVDD 21 Power supply PABIAS 22 PA bias supply for PA AVDD 23 Power supply PDN 24 Chip enable, low active GPIO7 25 Gpio7

37、 / vox (When Gpio7=VH, vox is active; else VL) GPIO6 26 Gpio6 / sq (When Gpio6=VH, sq is active; else VL) GPIO5 27 Gpio5 / txon (When Gpio5=VH, txon is active; else VL) GPIO4 28 Gpio4 / rxon (When Gpio4=VH, rxon is active; else VL) GPIO3 29 Gpio3 / sdo (Gpio3=VH or VL, it is the output register data

38、 in 4 wire control interface mode) GPIO2 30 Gpio2 / int (When Gpio2=VH, int is active; else VL) 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 9 of 16 RDA Micro

39、electronics, Inc. RDA1846 SPEC V1.2e 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 10 of 16 GPIO1 31 Gpio1 / code_in / code_out (Gpio1=VH or VL, it is the input/output code data) GPIO0 32 Gpio0 / css_in / css_out (Gpio0=VH or VL, it is the input/output CTCSS/CDCSS signal) *Attention: all NC pins should be floating. Do not connect it to GND! RDA Microelectronics