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data sheet conexant proprietary informati on doc. no. w117, rev. b september 28, 1999 RF105 900 mhz digital spread spectrum transceiver the RF105, a fully integrated transceiver device, provides the transmit, receive, and frequency synthesis functions for digital spread spectrum (dss) systems operating in the 902?928 mhz industrial, scientific, and medical (ism) band. it implements a direct conversion architecture and time division duplexing (tdd) of the transmit and receive signals to minimize circuit complexity. the receive path of the RF105 provides complete rf-to-baseband in-phase and quadrature (i/q) demodulation, including a low noise amplifier (lna), double- balanced quadrature mixers, fully integrated channel selection filters, and baseband variable-gain amplifiers. the transmit path is a variable-gain direct conversion modulator. these paths are shown in figure 1. a 902?928 mhz frequency synthesizer with on-chip vco and resonator provides the lo frequency for both transmit and receive modes. the RF105 features low-voltage operation (2.7 ?4. 5 v) for low power consumption. the RF105, combined with conexant's rf106 power amplifier, forms a complete system solution for a direct conversion 900 mhz dss radio that is fully compliant with fcc part 15 regulations in the ism band. lnaattn phase shifter prescaler 47 counter control logic 16 lnain ext. lpf vco modulator mixers power mgmt. pfd/cp modulator gain ctrl. rfo1 rfo2 lna fref gmcres rxq gc rxi strobe clk data txd rxen synthen txen modset ps1 ps2 1200khz 820khz ext. cservo 1200khz 820khz ext. cservo figure 1. RF105 block diagram RF105 1 2 3 4 5 6 7 8 12 9 10 11 36 35 34 33 32 31 30 29 25 28 27 26 13 14 15 16 17 18 19 20 24 21 22 23 48 47 46 45 44 43 42 41 37 40 39 38 strobe gnd10 synthen vcobpc gnd9 nc chpo vcc5 vcc4 con nc gnd8 clk gnd1 fref gnd2 txd vcc1 txref data lnaattn rxen lnain gnd3 modset gnd4 rfo1 ps1 gmcres mixbpc txen rfo2 gcref ps2 gc gnd5 vcc2 gnd7 gnd6 sri+ rxi+ vcc3 srq- srq+ sri- rxq+ rxi- rxq- figure 2. RF105 pin signals ? 48 pin tqfp features ? complete 900 mhz ism band transceiver with fully integrated synthesizer and vco including resonator ? low power dissipation ? fast settling from sta ndby mode to active mode ? separate enable lines for transmit, receive, and synthesizer ? 41 programmable channels with 600 khz channel spacing ? 3-battery cell operation (2.7?4.5 v) ? 48-pin tqfp package (see figure 2) receiver ? ln a/quadrature mixer from rf down to baseband ? selectable lna gain ? fully integrated channel selection filter with adjustable bandwidth ? receiver baseband amplifier with variable gain ? differential receiver baseband outputs transmitter ? variable gain modulator ? double-balanced mixer for b aseband- to-rf modulation ? differential rf outputs applications ? dss cordless tele phone ? direct sequence spread spectrum systems ? frequency hopping spread spectrum systems ? wireless lans ? wireless modems ? wireless security ? inventory control systems
RF105 900 mhz digital spread spectrum tran sceiver 2 conexant w117, rev. b conexant proprietary information september 28, 1999 technical description baseband filter bandwidth _______________________ the receive baseband filters have a bandpass characteristic. the low-pass cutoff is determined by the gmc filters and is set by the r gmc resistor connected to pin 19. the gmc filter has a 3-pole butterworth response and is preceded by a 4-pole butterworth sallen & key low-pass filter with a fixed cutoff frequency of 1.2 mhz. the fixed filters are designed to attenuate out-of-band blocking signals propagating through the receive path. the baseband high-pass cutoff is set by the bandwidth of the dc servo loop, which in turn is set by the value of the c servo capacitors connected between pins 32 and 33, and pins 34 and 35. the dc servo loop nulls out the dc offset in the receive baseband path. it is designed to be tolerant of the c servo equivalent series resistance (esr), so that common surface mount capacitors are suitable. the baseband high-pass cutoff frequency should be set much lower than the low-pass cutoff frequency, or else the servo loop w ill become unstable. the optimum receive bandwidth values are: f lpf = 820 khz, r gmc = 875 ? f hpf = 20 khz, c servo = 0.082 f rf output _____________________________________ the transmit rf outputs from the RF105 are differential and matched to 100 ? differential. if a single-ended connection is required, the unused output must be suitably terminated by a 50 ? resistor (see figure 4). the transmit output power is determined by the output power control inputs, ps1 (pin 20) and ps2 (pin 21), and by the value of r mod (connected to pin 14). r mod sets the bias current into the modulator, which is then multiplied by a factor set by the state of ps1 and ps2. ps1 and ps2 input programming is described in the transmitter section of table 3. the characteristic of the output peak envelope power (pep) versus r mod is shown in figure 3 for a sinusoidal 120 mv peak-to-peak input signal and for high power mode (ps1 = 0, ps2 = 0). for r mod equal to 1.2 k ? , the typical RF105 output power is approximately ?8 dbm in high-power mode. this provides approximately 20 dbm of transmit power when used with conexant?s rf106 (29 db gain pa). -12 -11 -10 -9 -8 -7 -6 -5 -4 tx pep (dbm) rmod (kohm) 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 figure 3. tx pep vs rmod (txd signal = 120 mvpp, 300 khz sinusoid, vcc = 3.0v)
900 mhz digital spread spectrum tran sceiver RF105 w117, rev. b conexant 3 september 28, 1999 con exant proprietary information recommendations on layout and implementation_____ a typical applications schematic is shown in figure 4. all vcc pins should be decoupled as close to the supply pin as possible, preferably right at the input pins. all ground pins should have minimum trace inductance to ground. if a ground plane cannot be provided right at the pins, the vias to the ground plane should be placed as close to the pins as possible. there should be one via for each ground pin. if the ground plane is at the bottom layer, it is recommended to have two vias in parallel for each ground pin. vcc1 (pin 6), vcc2 (pin 26), and vcc3 (pin 31) should be connected to the common vcc supply through individual decoupling networks. esd sensitivity _________________________________ the RF105 is a static-sensitive electronic device. do not operate or store near strong electrostatic fields. take proper electrostatic discharge (esd) precautions. clk fref data 33pf 0.01f 1000pf txdata shaping filter lnain 3.3pf * 33pf * 1000pf txd lnaattn 10nh * 1000pf vcc vcc 0.047f 33pf rxq rxi vcc 33pf 0.047f 402 ? gc rgmc rmod 2200pf 50 ? synthen strobe 33pf 0.047f vcc 0.015f 820pf 3920 ? 820pf rxen rfout txen ps1 ps2 cservo 0.082f voltage regulator (optional) 33pf 0.056f 0.056f * matching network values are layout-dependent. 1.2k ? 875 ? cservo 0.082f + + RF105 1 2 3 4 5 6 7 8 12 9 10 11 36 35 34 33 32 31 30 29 25 28 27 26 13 14 15 16 17 18 19 20 24 21 22 23 47 46 45 44 43 42 41 37 40 39 38 51k ? 10 ? 3920 ? 48 figure 4. typical applications diagram ? RF105
RF105 900 mhz digital spread spectrum tran sceiver 4 conexant w117, rev. b conexant proprietary information september 28, 1999 synthesizer programming ________________________ the synthesizer is programmed with a half-duplex 3-wire serial interface. the three signals are data, clk, and strobe. each rising edge of the clk signal shifts one bit of the data into the shift register and control register. when the strobe input is toggled from low to high, the data latched in the shift register is transferred to the programmable counter. six bits are shifted into the synthesizer for programming. the data format is as follows: msb lsb s6 s5 s4 s3 s2 s1 the timing relationship is shown in figure 6. the values of the programming bits, s1 to s6, for the programmable counter are defined in table 1. channel selection using a 9.6 mhz reference frequency, the phase locked loop (pll) synthesizer can generate frequencies from 903 mhz (channel 1) to 927 mhz (channel 41) at a channel spacing of 600 khz. the lo frequency (f lo ) is calculated by the following equation: f lo = (f ref /r) [(m n) + a] where: f ref is 9.6 mhz (reference oscillator) r is 16 (reference divider) m is 32/33 (prescaler) n is 47 (fixed counter) a is 1 to 41 (programmable counter) examples: (9.6 mhz / 16) (32 47 + 1) = 903 mhz (9.6 mhz / 16) (32 47 + 41) = 927 mhz synthesizer loop filter the vco for the synthesizer is designed on-chip with the varactor referenced to vcc. therefore, the loop filter components will need to be tied to vcc4 (pin 39) instead of ground. a typical loop filter design is shown below in figure 5. the loop bandwidth is approximately 5 khz with a nominal phase margin of 45 degrees. 0.01f 10k ? vco tune 330 pf 390 pf 10k ? chpo pin 43 figure 5. loop filter t1 t2 t3 t5 t4 msb lsb data clk strobe t1 =data setup time t2 =data hold time t3 =clock pulse-width t4 =strobe enable pulse-width t5 =strobe setup time to the rising edge of the last clock t1 to t5 1s each. figure 6. timing diagram
900 mhz digital spread spectrum tran sceiver RF105 w117, rev. b conexant 5 september 28, 1999 con exant proprietary information table 1. programmable counter data input dss telephone channel no. * synthesizer channel no. (a) frequency (mhz) s6 s5 s4 s3 s2 s1 ? 1 903.0 000000 ? 2 903.6 000001 1 3 904.2 000010 2 4 904.8 000011 ? 5 905.4 000100 3 6 906.0 000101 ? 7 906.6 000110 4 8 907.2 000111 . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 34 922.8 100001 ? 35 923.4 100010 18 36 924.0 100011 ? 37 924.6 100100 19 38 925.2 100101 20 39 925.8 100110 ? 40 926.4 100111 ? 41 927.0 101000 * dss telephone channel numbers are applicable when RF105 is used with conexant's hummingbird chip set. channel spacing = 1.2 mhz between adjacent channels from channel 2 through channel 19; channel spacing = 600 khz between channels 1?2 and between channels 19?20.
RF105 900 mhz digital spread spectrum tran sceiver 6 conexant w117, rev. b conexant proprietary information september 28, 1999 interface description table 2. pin description pin name description pin name description 1 gnd1 ground 25 gnd6 ground 2 clk synthesizer programming clock input 26 vcc2 s upply for baseband outputs 3 fref reference frequency input for synthesizer 27 rx q? q channel baseband differential outputs 4 data synthesizer programming data input 28 rx q+ 5 txref reference for tx data input, ac-coupled to ground 29 rx i? i channel baseband differential outputs 6 vcc1 s upply for lna and rx mixer 30 rx i+ 7 txd baseband tx data input 31 vcc3 s upply for baseband circuits 8 gnd2 lna emitter ground 32 sr q? q channel dc offset cancellation servo external 9 rxen receive enable 33 sr q+ capacitor connections 10 lnaattn lna attenuation control 0 = high-gain mode, 1 = low-gain mode 34 sr i? i channel dc offset cancellation servo external capacitor connections 11 lnain lna rf input 35 sr i+ 12 gnd3 ground 36 gnd7 ground 13 gnd4 ground 37 gnd8 ground 14 modset input to set tx modulator gain 38 nc no connect 15 rfo1 differential tx rf output 39 vcc4 s upply for vco 16 rfo2 differential tx rf output, inverse polarity 40 con vco control input 17 txen transmit enable 41 vcobpc bias bypass capacitor for vco bias 18 mixbpc bypass capacitor for rx mixer bias 42 gnd9 gr ound for vco 19 gmcres resistor to set cutoff frequency of channel selection filter 43 nc no connect 20 ps1 modulator power control input (see table 3) 44 chpo charge pump output 21 ps2 modulator power control input (see table 3) 45 vcc5 s upply for synthesizer 22 gcref reference for gain control input connected to ground 46 synthen synthesizer enable 23 gc baseband variable gain amplifier control input 47 strobe synthesizer programming load enable 24 gnd5 ground 48 gnd10 ground
900 mhz digital spread spectrum tran sceiver RF105 w117, rev. b conexant 7 september 28, 1999 con exant proprietary information specifications table 3. electrical specifications (1 of 3) note: t a = 25 c, v cc = 3.6 v, f lo = 915 mhz parameter min typical max units receiver section rx voltage gain: lna high-gain mode (lnaattn = 0) gc = 1.3 v gc = 1.6 v gc = 1.9 v lna gain step 99.5 77.5 37.5 105 82.5 38 19 109.5 87.5 42.5 db rx gain variation vs. frequency 902 mhz < f lo < 928 mhz 0.5 1 db rx ssb noise figure: high-gain mode, gc = 1.3 v 6.5 8.0 db rx input ip3: lna high-gain mode, gc = 1.9 v lna low-gain mode, gc = 1.9 v ?36 ?15 dbm rx input p1db: lna high-gain mode (lnaattn = 0) gc = 1.3 v gc = 1.6 v gc = 1.9 v lna low-gain mode (lnaattn = 1) gc = 1.9 v ?101 ?79 ?47 ?97 ?74 ?43 ?22 dbm am demodulation suppression at lna input to mixer output 60 db lo power at lnain ?80 dbm i/q phase imbalance 1 5 deg i/q amplitude imbalance 0.5 3 db input high voltage, lnaattn, rxen vih 1.9 v input low voltage, lnaattn, rxen vil 0.75 input high current, rxen iih 125 200 a input low current , rxen iil ?25 input high current, lnaattn iih 60 a input low current, lnaattn iil ?25 gc i in ?500 500 a baseband amplifier gain control range (gc = 1.3v ? 1.9v) 60 67 75 db gc input voltage range 1.2 1.6 2.0 v baseband amplifier gain control sensitivity gc = 1.3?1.9 v gc = 1.3 v gc = 1.6 v gc = 1.9 v 0.04 0.14 0.13 0.17 db/mv rx p1db @ 3.9 mhz offset lna high gain, gc = 1.9 v lna low gain, gc = 1.9 v ?45 ?14 dbm baseband output load capacitance 20 50 pf baseband lpf 3 db bandwidth (rgmc = 875 ? ) 0.65 0.82 0.97 mhz baseband selectivity @ 3.9 mhz 60 70 db baseband differential output vcm 1.0 vdd ? 1.0 v baseband output dc offset 25 mv rxi, rxq dc and gain settle time (note 1) from initial rxen input at tdd rate > 250 hz 50 100 s baseband hpf 3db bandwidth (servo capacitors = 82 nf) 13 20 29 khz baseband output voltage swing (peak differential) 300 mv baseband output snr (gc = 1.9 v) 24 db
RF105 900 mhz digital spread spectrum tran sceiver 8 conexant w117, rev. b conexant proprietary information september 28, 1999 table 3. electrical specifications (2 of 3) parameter min typical max units frequency synthesizer section lo frequency range 903 927 mhz pll vco center frequency @ control voltage of 1.1 v 915 mhz pll vco sensitivity 35 50 75 mhz/v lo settling time ? f = 10 mhz, settle to f final 5 khz, 5 khz lfbw 2 msec lo phase noise 100 khz offset 1 mhz offset ?100 ?95 ?115 dbc/hz vco (varactor) input leakage 0.01 a input reference frequency, fref 9.6 mhz frequency step, f s 600 khz comparison frequency (600 khz) spur level ?60 dbc rms phase jitter, 25?700 khz 5 degrees rms input high voltage, strobe, clk, data, synthen vih input low voltage, strobe, clk, data, synthen vil 1.9 0.75 v input high current, strobe, clk, data iih input low current, strobe, clk, data iil ?25 40 a input high current, synthen iih input low current, synthen iil ?25 100 a input high voltage, fref vih input low voltage, fref vil 1.9 0.75 v input high current, fref iih input low current, fref iil ?25 100 a charge-pump output current 225 a output short-circuit current chpo 1.0 ma transmitter section gain variation vs. frequency 902 mhz < f lo < 928 mhz 0.5 1.0 db peak-envelope output power (single-ended): (note 2) high power mode (ps1 = 0, ps2 = 0) medium power mode (ps1 = 0, ps2 = 1) low power mode (ps1 = 1, ps2 = 0) undefined mode (ps1 = 1, ps2 = 1) ?11 ?8 ?19 ?27.5 not used ?6.5 dbm im3 (txd input signal 2 tones each 60 mvpp) ?30 ?40 dbc output vswr for unconditional stability 10:1 lo suppression ?15 ?25 dbc txd input impedance 10 k ? txd input peak-to-peak sine wave for target output peak-envelope power 120 mv pp txd input bandwidth 80 mhz txd to rf settle time to within spec value from txen 50 s tx dc offset 2mv input high voltage, ps1, ps2, txen vih input low voltage, ps1, ps2, txen vil 1.9 0.75 v input high current, ps1, ps2, txen iih input low current, ps1, ps2, txen iil ?25 60 a input high current txen iih input low current txen iil ?25 100 a
900 mhz digital spread spectrum tran sceiver RF105 w117, rev. b conexant 9 september 28, 1999 con exant proprietary information table 3. electrical specifications (3 of 3) parameter min typical max units power supply total supply current: rx mode (rxen, synthen = 1) tx mode (txen, synthen = 1) (note 2) high power mode medium power mode low power mode synth mode (synthen = 1) sleep mode (rxen, txen, synthen, lnaattn = 0) 48 25 20 20 15 65 33 28 27 21 5 78 41 35 34 25 100 ma ma ma ma ma a power supply range (note 3) 2.7 3.6 4.5 vdc notes: 1. gain settled to within 90% of final value, dc settled to within 10% of desired signal?s final value. 2. txd input signal 120 mvpp, 300 khz sinusoidal, rmod = 1.2 k ? . 3. the specifications in table 3 are guaranteed at a supply voltage (vcc) of 3.6 v. at vcc below 3.0 v, the RF105 is functional, but the system performance may be degraded. table 4. absolute maximum ratings parameter min max unit supply voltage (vcc) (note 1) ?0.3 5.0 v input voltage range (note 1) ?0.3 vcc v power dissipation 500 mw lna input power +5 dbm operating temperature range ?10 70 c storage temperature ?40 125 c notes: 1. voltages are referenced to gnd.
RF105 900 mhz digital spread spectrum tran sceiver 10 conexant w117, rev. b conexant proprietary information september 28, 1999 device dimensions RF105 device dimensions are shown below in figure 7. detail a a1 l1 c l a a2 millimeters 0.05 8.85 0.5 0.11 1.6 max 0.15 9.15 5.5 ref 0.75 1.0 ref 0.500 ref 0.17 0.10 max 0.0020 0.3484 0.0197 0.0043 min. max. min. max. inches* dim. ref: 48-pin tqfp (gp00-d283) 0.0630 max 0.0060 0.3602 0.2165 ref 0.0295 0.0394 ref 0.0197 ref 0.0067 0.0039 max metric values (millimeters) should be used for pcb layout. english values (inches) are converted from metric values and may contain round-off errors. * d1 detail a e b d2 d1 d d2 d1 d 1.35 1.45 0.0528 0.0571 0.2736 0.2776 6.95 7.05 0.220 ref 0.0087 ref a a1 a2 d d1 d2 l l1 e b c coplanarity figure 7. RF105 device dimensions
900 mhz digital spread spectrum tran sceiver RF105 w117, rev. b conexant 11 september 28, 1999 con exant proprietary information information provided by conexant systems, inc. (conexant) is believed to be accurate and reliable. however, no responsibility i s assumed by conexant for its use, nor any infringement of patents, copyrights, or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent rights or copyright of conexant other than for circuitry embodied in conexant products. conexant res erves the right to change circuitry at any time without notice. this document is subject to change without notice. conexant products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a c onexant product can reasonably be expected to result in personal injury or death. conexant customers using or selling conexant products for use in such applications do so at their own risk and agree to fully indemnify conexant for any damages resulting from such improper use or sale. conexant, the conexant c symbol, and ?what?s next in communications technologies? are trademarks of conexant systems, inc. product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of third parties. all other marks mentioned herein are the property of their respective owners. ?1999, conexant systems, inc. all rights reserve d
further information: literature@conexant.com 1-800-854-8099 (north america) 33-14-906-3980 (international) web site www.conexant.com world headquarters conexant systems, inc. 4311 jamboree road, p.o. box c newport beach, ca 92658-8902 phone: (949) 483-4600 fax: (949) 483-6375 u.s. florida/south america phone: (727) 799-8406 fax: (727) 799-8306 u.s. los angeles phone: (805) 376-0559 fax: (805) 376-8180 u.s. mid-atlantic phone: (215) 244-6784 fax: (215) 244-9292 u.s. north central phone: (630) 773-3454 fax: (630) 773-3907 u.s. northeast phone: (978) 692-7660 fax: (978) 692-8185 u.s. northwest/pacific west phone: (408) 249-9696 fax: (408) 249-7113 u.s. south central phone: (972) 733-0723 fax: (972) 407-0639 u.s. southeast phone: (919) 858-9110 fax: (919) 858-8669 u.s. southwest phone: (949) 483-9119 fax: (949) 483-9090 apac headquarters conexant systems singapore, pte. ltd. 1 kim seng promenade great world city #09-01 east tower singapore 237994 phone: (65) 737 7355 fax: (65) 737 9077 australia phone: (61 2) 9869 4088 fax: (61 2) 9869 4077 china phone: (86 2) 6361 2515 fax: (86 2) 6361 2516 hong kong phone: (852) 2 827 0181 fax: (852) 2 827 6488 india phone: (91 11) 692 4780 fax: (91 11) 692 4712 korea - seoul office phone: (82 2) 565 2880 fax: (82 2) 565 1440 korea - taegu office phone: (82 53) 745-2880 fax: (82 53) 745-1440 europe headquarters conexant systems france les taissounieres b1 1681 route des dolines bp 283 06905 sophia antipolis cedex france phone: (33 1) 41 44 36 50 fax: (33 1) 93 00 33 03 europe central phone: (49 89) 829 1320 fax: (49 89) 834 2734 europe mediterranean phone: (39 02) 9317 9911 fax (39 02) 9317 9913 europe north phone: (44 1344) 486 444 fax: (44 1344) 486 555 europe south phone: (33 1) 41 44 36 50 fax: (33 1) 41 44 36 90 middle east headquarters conexant systems commercial (israel) ltd. p.o. box 12660 herzlia 46733 israel phone: (972 9) 952 4064 fax: (972 9) 951 3924 japan headquarters conexant systems japan co., ltd. shimomoto building 1-46-3 hatsudai, shibuya-ku tokyo, 151-0061 japan phone: (81 3) 5371 1567 fax: (81 3) 5371 1501 taiwan headquarters conexant systems, taiwan co., ltd. room 2808 international trade building 333 keelung road, section 1 taipei 110 taiwan, roc phone: (886 2) 2720 0282 fax: (886 2) 2757 6760

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