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copyright ? rda microelectronics inc. 2009. all rights are reserved. the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. RDA1846 s ingle c hip t ransceiver f or w alkie t alkie 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/i 2 c 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 ? ce llular 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 free datasheet http://
copyright ? rda microelectronics inc. 2009. all rights are reserved. the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le 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 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 free datasheet http://
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 voic e in the rx path and from voice to rf carrier in the tx path, the chip integrates nearly all the function al blocks including rf and base band analog blocks and digital signal processor. it requires only one micr o 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 tec hnology advanced algorithms such as afc, agc, rssi and snr calculations ar e 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 reduce s 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 chi p 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 exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 3 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 4 of 16 3.2 voice input and output in the rx p ath, the voice signal after demodulation is 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 fre quency synthesizer generates the local oscillator signal. all building blocks are fully integrated 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 t he RDA1846 supports xtal clocks such as 12.8 mhz, 13 mhz, 25.6 mhz and 26 mhz. the 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 osc illator, refer to the programming guide) 3.5 dsp functions the dsp accomplishes the demodulation and modulation of the fm signal. standard 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 ld os are integrated on chip which eliminates using one ldo chip on the pcb. supply voltage for the chip is suggested to be within 3.3v~4.8v. 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/i 2 c serial interface is provided for host ic to read and write RDA1846 control registers. (for details of the serial control interface, refer to the programming guide) . free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 4. electrical characteristics table 4-1 dc electrical specificati on (recommended operation conditions): symbol description min typ max unit avdd supply voltage from battery or ldo 3.3 3.3 4.8 v t amb ambient temperature -25 27 +85 v l cmos low level input/output voltage 0 0.3 v v h cmos high level input/output voltage 2.7 3 v v th cmos threshold voltage 1.5 v table 4-2 dc electrical specificat ion (absolute maximum ratings): symbol description min typ max unit t amb ambient temperature -40 +90 c i in input current -10 +10 ma v in input voltage -0.3 3.3 v v lna lna input level +10 dbm table 4-3 power consumption specification (avdd = 3.3 v, t a = -25 to 85 , unless otherwise specified) state description condition typ unit i rx continue receive rxon=1,pdn=1 55 ma i tx continue transmit txon=1,pdn=1 50 ma i sleep deep sleep pdn=0 40 ? a the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 5 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le 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 specified) 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 ip3 in input ip3 max rx gain -10 -6 0 dbm sen sensitivity 12.5khz channel, 12db sinad -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 85 c, unless otherwise specified) symbol parameter conditions min typ max unit general specifications 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 limitation 2.2 2.5 khz free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 6. control interface characteristics refer to the ?RDA1846 programming guide?. the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 7 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 7. pins description figure 7.1 RDA1846 top view the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 8 of 16 free datasheet http://
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 pin 2 mode 7 control interface select when mode = v l , i 2 c interface is select when mode = v h , 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 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 / vox (when gpio7=v h , vox is active; else v l ) gpio6 26 gpio6 / sq (when gpio6=v h , sq is active; else v l ) gpio5 27 gpio5 / txon (when gpio5=v h , txon is active; else v l ) gpio4 28 gpio4 / rxon (when gpio4=v h , rxon is active; else v l ) gpio3 29 gpio3 / sdo (gpio3=v h or v l , it is the output register data in 4 wire control interface mode) gpio2 30 gpio2 / int (when gpio2=v h , int is active; else v l ) the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 9 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 10 of 16 gpio1 31 gpio1 / code_in / code_out (gpio1=v h or v l , it is the input/output code data) gpio0 32 gpio0 / css_in / css_out (gpio0=v h or v l , it is the input/output ctcss/cdcss signal) *attention: all nc pins should be floating. do not connect it to gnd! free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 8. application diagram figure 8.1 RDA1846 application diagram notes: 1 u1: RDA1846 chip; 2 avdd: power supply for RDA1846 (3.3~4.8v); 3 avdd_pa: power supply for rf pa, its voltage depends on the actual pa design; 4 c0~c11: avdd decouple capacitance (1nf and 100nf in pairs), as close to avdd pin as possible; 5 ca1~ca2: audio ac couple capacitance (~47uf); 6 cc: compensation capacitance connected between pin cc and gnd (~47uf); 7 crf: rf ac couple capacitance (~150pf); 8 cx1~cx2: xtal oscillator load capacitanc e. its value depends on the chosen xtal (if using external tcxo, clk should be sent into pin xtal1 with vpp about 1.5v, and pin xtal2 should be connected to gnd) ; 9 r0~r1(optional): resistors for seri al interface wire sdio and sclk (~10k ? ); 10 pins nc(10,14,17,19,20) should be floating; 11 external vox detection circuit is optional; the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 11 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 9. package outline 32-pin 5x5 quad flat no-lead (qfn) the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 12 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e 10. solder mounting condition classification reflow profile table 10-1 classification reflow profiles profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (t smax to t p ) 3 o c/second max. 3 o c/second max. preheat -temperature min (t smin ) -temperature max (t smax ) -time (t smin to t smax ) 100 o c 100 o c 60-120 seconds 150 o c 200 o c 60-180 seconds time maintained above: -temperature (t l ) -time (t l ) 183 o c 60-150seconds 217 o c 60-150 seconds peak /classification temperature(t p ) see table-ii see table-iii time within 5 o c of actual peak temperature (t p ) 10-30 seconds 20-40 seconds ramp-down rate 6 o c/second max. 6 o c/seconds max. time 25 o c to peak temperature 6 minutes max. 8 minutes max. the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 13 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 14 of 16 table 10-2 snpb eutectic process ? package peak reflow temperatures package thickness volume mm 3 <350 volume mm 3 350 2.5mm 240 + 0/-5 o c 225 + 0/-5 o c 2.5mm 225 + 0/-5 o c 225 + 0/-5 o c table 10-3 pb-free process ? package classification reflow temperatures package thickness volume mm 3 350 volume mm 3 350-2000 volume mm 3 2000 1.6mm 260 + 0 o c * 260 + 0 o c * 260 + 0 o c * 1.6mm ? 2.5mm 260 + 0 o c * 250 + 0 o c * 245 + 0 o c * 2.5mm 250 + 0 o c * 245 + 0 o c * 245 + 0 o c * *tolerance : the device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperatur e(this mean peak reflow temperature + 0 o c. for example 260+ 0 o c ) at the rated msl level. note 1: all temperature refer topside of the packa ge. measured on the package body surface. note 2: the profiling tolerance is + 0 o c, - x o c (based on machine variat ion capability)whatever is required to control t he profile process but at no time will it exceed - 5 o c. the producer assures process compatibility at the peak reflow profile temperatures defined in table ?iii. note 3: package volume excludes external terminals( balls, bumps, lands, leads) and/or non integral heat sinks. note 4: the maximum component temperature r eached during reflow depends on package the thickness and volume. the use of convecti on reflow processes reduces the thermal gradients between packages. however, thermal gradients due to differences in thermal mass of smd package may sill exist. note 5: components intended for use in a ?lead-free? assembly process shall be evaluated using the ?lead free? classification temperatures and pr ofiles defined in table-i ii iii whether or not lead free. free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e rohs compliant the product does not contain lead, mercury, cadmium, hexav alent chromium, polybrominated biphenyls (pbb) or polybrominated diphenyl ethers (pbde), and are theref ore considered rohs compliant. esd sensitivity integrated circuits are esd s ensitive and can be damaged by st atic electricity. proper esd techniques should be used w hen handling these devices. the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 15 of 16 free datasheet http://
rda microelectronics, inc. RDA1846 spec v1.2e the information contained herein is the exclus ive property of rda and shall not be distributed, reproduced, or disclosed in who le or in part without prior written permission of rda. page 16 of 16 11. change list rev date auther change description v1.0e 2009-06-24 hao shi original draft. v1.1e 2009-10-10 ge liu v1.1 original draft v1.2e 2009-12-11 ge liu add 200m~260mhz 12. contact information rda microelectronics (shanghai), inc. suite 1108 block a, e-wing center, 113 zhichun road haidian district, beijing tel: 86-10-62635360 fax: 86-10-82612663 postal code: 100086 free datasheet http://

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