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data sheet conexant ? proprietary doc. no. 101105a data subject to change october 17, 2000 CX74036 is-136 receive rf ic for tdma and amps applications conexant?s CX74036 receive rf ic is an advanced, highly integrated and high performance, triple-mode, dual-band ic for is-136 compliant cellular radio applications and is designed in an advanced 28 ghz ft bicmos process. in the 800 mhz cellular band, the CX74036 is designed to operate in both the time division multiple access (tdma) mode and advanced mobile phone system (amps) mode. in the 1900 mhz personal communications system (pcs) band, the device operates in the tdma mode. the CX74036 embodies all the necessary functions for a radio receiver system except for the rf and intermediate frequency (if) filters and rf local oscillator (lo) sources. the device front-end section has two low noise amplifier (lna) and mixer pairs, one for the 800 mhz band and the other for the 1900 mhz band. a common path is taken from the first if mixer output to the demodulator output. the CX74036 48-pin, 7x7 land grid array (lga) package pin configuration is shown in figure 1. a block diagram of the CX74036 is shown in figure 2. features ? front-end to baseband in one ic ? inphase and quadrature (i/q) demodulator ? 3 v supply operation ? low current consumption ? lna gain switch with current reduction ? if lo synthesizer with voltage controlled oscillator (vco) (requires external tank) ? 70 db variable gain amplifier (vga) dynamic range ? low noise figure (nf) and high 3rd order input intercept point (iip3) mixers applications ? cellular and/or pcs band phones ? tdma and/or amps mode phones ? portable battery powered radio equipment 101105a-1_082500 if_o- q- q+ i- i+ ext_loin vcc_vco vco- vco+ vcc_syn lp_fil refin data 35 34 33 32 31 30 29 28 27 25 36 37 26 mx2i- vcc_if ifbypass mx2out vvga vcc_vga vgai- vgai+ fb_cap latch_en clk 17 16 15 14 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 lna_g mxih mixil band chip_en loih loil vcc_mx standby iq/if mxout+ mxout- mx2i+ 45 46 47 48 44 43 42 41 40 39 38 lna_oh lna_ol vcc2_lnah vcc2_lnal vcc1_lna nc2 lna_inl lna_inh nc1 ext_lo if_o+ figure 1. CX74036 48-pin, 7x7 lga package pin configuration
CX74036 receive rf ic 2 conexant ? proprietary 101105a data subject to change october 17, 2000 vvga 1st if lo vhf synth p 19.44 mhz ext.1.8 mhz 4 power management vcc standby pcs rf in cell rf in cell lo image rejection filter pcs lo if buffer rx rfic CX74036 101105a-2_101200 interface power down en data clk lna gain band select vco/refin i if out q iq/ if 1st if saw image rejection filter 450 khz figure 2. CX74036 functional block diagram technical description low noise amplifiers: the CX74036 contains two independent lnas for the cellular and pcs bands. the gain of both lnas can be switched off to a loss mode via one command line interface. only one lna is powered at any given time. control is done by an external band-select control signal. the input and output matches are external to the chip. the lnas? parameters, noise figure (nf), and gain are chosen to provide an excellent balance between system sensitivity and iip3 requirements to achieve maximum dynamic range. both lna outputs are ported off-chip to allow for image filtering before being fed to the rf mixer inputs. rf mixers: the mixers are designed to operate with a low lo input power level of ?10 dbm. this eliminates the requirement of buffer amplifiers for the external vco. cellular band mixer high gain and low nf performance allow for the cellular lna gain to be lower, which saves current consumption. both mixers are designed to provide high suppression of one-half if response. the outputs of both mixers share a common interface path to the external if surface acoustic wave (saw) filter, which reduces complexity and cost. the rf mixer load configuration is shown in figure 3. inductors can be surface mount multilayer chip (smmc) components. first if mixer : this mixer begins the common signal path for both cellular and pcs band modes. input and output impedance are set to values that are close to the most commonly available saw and ceramic filters. vcc vcc 330 nh 330 nh + - rf mixers output 10 k ? to if saw filter 101105a-3_101100 1200 pf 1200 pf figure 3. rf mixer load configuration variable gain amplifier: the vga itself provides 70 db of dynamic range to satisfy the high system dynamic range requirement. with the inclusion of the lna gain switch, the system dynamic range is extended to more than 95 db. i/q demodulator: using digital circuitry generates a stable quadrature lo signal, on-chip direct connection to the vga output, on-chip lo source, and lowpass filtering for each channel. this, in turn, provides a high performance i/q demodulator with very low amplitude and phase offsets. the output signal quality is compatible with many baseband interface requirements.
receive rf ic CX74036 101075a conexant ? proprietary 3 october 17, 2000 data subject to change vhf synthesizer and oscillator: the on-chip vhf synthesizer and an oscillator with an added external tank circuit generate the required second if lo signal for conversion down to the standard second if signal. a programmable divide circuit is also included to generate the lo for the i/q demodulator. depending on the frequency plan used, an option is provided to inject an external lo source for the i/q demodulator. control logic truth table. the control logic truth table is shown in table 1. 3-wire bus programming. the 3-wire bus programming data is included in table 2. the 3-wire programming data pattern diagram is shown in figure 4. electrical and mechanical specifications ________________ the signal pin assignments, names, and descriptions are found in table 3. absolute maximum ratings are provided in table 4, the recommended operating conditions are specified in table 5. electrical characteristics are shown in table 6. figure 6 provides the 48-pin, 7x7 lga package dimensions. esd sensitivity the CX74036 is a static-sensitive electronic device. do not operate or store near strong electrostatic fields. take proper esd precautions. table 1. control logic truth table mode lna_g band chip_en standby iq/if lo_ext active, low band, lna high gain, iq101101 active, high band, lna high gain, iq111101 active, low band, lna low gain, iq001101 active, high band, lna low gain, iq011101 active, low band, lna high gain, if101111 active, high band, lna high gain, if111111 active, low band, lna low gain, if001111 active, high band, lna low gain, if011111 standby --- --- 0 1 --- 1 external lo mode --- --- 1 --- --- 0 sleep --- --- 0 0 --- 0 note. synthesizer prescaler and charge pump can be turned off via programming from the 3-wire bus. this mode can be used when drivi ng the if mixer with an external synthesizer. table 2. 3-wire bus programming data bit number function programming 00 select vco or reference input to programming counter ?0? = reference input ?1? = vco input 01 ? 08 synthesizer m counter programming, mb0 ? mb7 09 ? 12 synthesizer a counter programming, ab0 ? ab3 13 ? 23 synthesizer reference counter programming, rb0 ? rb10 24 charge pump polarity ?0? = ground referenced varactor ?1? = vcc referenced varactor 25 ? 32 programmable m counter programming, m2b0 ? m2b1 33 ? 34 programmable a counter programming, a2b0 ? a2b1 35 synthesizer power down (for external synthesizer mode) ?0? = internal synthesizer ?1? = external synthesizer
CX74036 receive rf ic 4 conexant ? proprietary 101105a data subject to change october 17, 2000 msb 00 = first bit shifted in (lsb) 35 = last bit shifted in (msb) vrs = select vco or reference input to programmable counter "0" = reference input "1" = vco input mb0 - mb7: programming for synthesizer m counter: mb0 (lsb), mb7 = (msb) ab0 - ab3: programming for synthesizer a counter: ab0 (lsb), ab7 = (msb) rb0 - rb10: programming for synthesizer r counter: rb0 (lsb), rb10 = (msb). cpp = change pump polarity, "0" = ground reference m2b0 - m2b7: programming for lo divider m counter: m2b0 (lsb), m2b7 = (msb) a2b0 - a2b7: programming for lo divider a counter: a2b0 (lsb), a2b1 = (msb) spd = synthesizer power down (for external synthesizer mode) "1" = internal synthesizer, "0"= external synthesizer spd 35 a2b0 33 m2b7 32 m2b6 31 m2b5 30 a2b1 34 m2b4 29 m2b2 27 m2b1 26 m2b0 25 cpp 24 m2b3 28 rb10 23 rb8 21 rb7 20 rb6 19 rb5 18 rb9 22 rb4 17 rb2 15 rb1 14 rb0 13 ab3 12 rb3 16 ab2 11 ab0 09 mb7 08 mb6 07 mb5 06 ab1 10 mb4 05 mb2 03 mb1 02 mb0 01 vrs 00 mb3 04 lsb 101105a-4_101200 figure 4. 3-wire programming data pattern table 3. signal pin names and definitions (1 of 2) pin no. signal name description 1 lna_g lnas gain control command 2 mxih 1900 mhz band mixer input 3 mixil 800 mhz band mixer input 4 band 800 mhz/1900 mhz band select command 5 chip_en chip power down select command 6 loih 1900 mhz rf mixer lo input 7 loil 800 mhz rf mixer lo input 8vcc_mx rf mixer vcc 9 standby control signal to enable rf lo buffers and vhf synthesizer 10 iq/if i/q or if output select command 11 mxout+ rf mixer output. open collector. 12 mxout- rf mixer output. open collector. 13 mx2i+ if mixer input 14 mx2i- if mixer input 15 vcc_if if section vcc 16 ifbypass if mixer bias decoupling 17 mx2out if mixer output 18 vvga analog voltage input for vga gain control 19 vcc_vga vga section vcc 20 vgai- vga input 21 vgai+ vga input 22 fb_cap vga dc feedback filter capacitor connection 23 latch_en enable input line for internal synthesizer programming 24 clk serial clock input line for internal synthesizer programming 25 data serial data input line for internal synthesizer programming 26 refin 19.44 mhz reference oscillator input. requires vcc/2 dc bias.
receive rf ic CX74036 101105a conexant ? proprietary 5 october 17, 2000 data subject to change table 3. signal pin names and definitions (2 of 2) pin no. signal name description 27 lp_fil if pll external loop filter connection 28 vcc_syn synthesizer section vcc 29 vco+ if vco external tank circuit connection 30 vco- if vco external tank circuit connection 31 vcc_vco vco section vcc 32 ext_loin external lo input for quadrature detector. requires vcc/2 dc bias. 33 i+ i channel data output 34 i? i channel data output 35 q+ q channel data output 36 q? q channel data output 37 if_o? buffered if output 38 if_o+ buffered if output 39 ext_lo programmable counter on/off control signal for choosing between internal and external demodulator lo. 40 nc1 no connect 41 lna_inh 1900 mhz band lna input 42 lna_inl 800 mhz band lna input 43 nc2 no connect 44 vcc1_lna bias vcc for lnas 45 vcc2_lnal vcc for cellular band lna. 46 vcc2_lnah vcc for pcs band lna. 47 lna_ol 800 mhz band lna output. requires external matching and ac coupling. 48 lna_oh 1900 mhz band lna output. requires external matching and ac coupling. table 4. absolute maximum ratings parameter symbol minimum typical maximum units supply voltage vcc ?0.3 +3.6 v input voltage range ?0.3 vcc v lna input power +5 dbm power dissipation 600 mw ambient operating temperature ?40 +85 c storage temperature ?40 +125 c
CX74036 receive rf ic 6 conexant ? proprietary 101105a data subject to change october 17, 2000 table 5. recommended operating conditions parameter symbol minimum typical maximum units supply voltage 2.7 3.0 3.6 v logic level high 1.9 v logic level low 0.8 v supply current in cellular tdma/amps, high gain 30 ma supply current in cellular tdma/amps, low gain 28 ma supply current in pcs tdma, high gain 33 ma supply current in pcs tdma, low gain 30 ma supply current in cellular if, high gain 29 ma supply current in pcs if, high gain 32 supply current in sleep mode tbd a table 6. electrical characteristics (1 of 5) vcc = 3.0 v, t a = 25 o c parameter symbol test conditions minimum typical maximum units lna 800 input frequency band 869 894 mhz noise figure, high gain noise figure, low gain 15 to 50 c ?40 to +85 c 2 2.3 2.75 20 db high gain low gain ?40 to +85 c 15 16 ?15 17 db output p1db at high/low gain 0/ ?25 dbm output ip3, high gain output ip3, low gain 15 to 50 c ?40 to +85 c 9 8 ?15 10 dbm input impedance external match and ac coupled tbd ? output impedance internal match and internal ac coupled 50 ? output return loss ?14 db reverse isolation at high/low gain 30/ ?15 db input damage threshold 10 dbm switched gain, current reduction 1.5 ma mix 800 input frequency band 869 894 mhz output frequency band 120 180 mhz lo frequency band 989 1074 mhz power gain differential gain to 400 ? load. ?40 to +85 c 91011db noise figure 15 to 50 c ?40 to +85 c 8.5 9.0 10 db output ip3 15 to 50 c ?40 to +85 c 14 13 15 dbm output p1db 5dbm input impedance external match to 50 ? and ac coupled. 450 ?
receive rf ic CX74036 101105a conexant ? proprietary 7 october 17, 2000 data subject to change table 6. electrical characteristics (2 of 5) vcc = 3.0 v, t a = 25 o c parameter symbol test conditions minimum typical maximum units mix 800 (continued) mixer spurious performance: 2x(lo ? rf); (lo ? rf)/2 3x(lo ? rf); (lo ? rf)/3 lo = ?10 dbm rf = ?50 dbm ?59 ?60 ?60 dbc dbc output impedance set externally using defined circuit topology. 400 ? lo input port impedance internal match. external ac coupled 50 ? lo input port load isolation active/standby transition ?20 db required lo level ?13 ?10 ?5 dbm lo to rf port isolation referenced to lo input pin 30 db lo to if port isolation referenced to lo input pin 20 db lna 1900 input frequency band 1930 1990 mhz noise figure, high gain noise figure, low gain 15 to 50 c ?40 to +85 c 2.5 2.8 3.3 18 db high gain low gain ?40 to +85 c 15 16 ?15 17 db output p1db 0/ ?25 dbm output ip3, high gain output ip3, low gain 15 to 50 c ?40 to +85 c 9 8 ?15 10 dbm input impedance external match and ac coupled. tbd ? output impedance internal match and internal ac coupled. 50 ? output return loss -14 db reverse isolation at high/low gain 30/ ?15 db input damage threshold 10 dbm switched gain, current reduction 2.5 ma mix 1900 input frequency band 1930 1990 mhz output frequency band 120 180 mhz lo frequency band 2050 2170 mhz power gain ?40 to +85 c 91011db noise figure 15 to 50 c ?40 to +85 c 9.0 10.3 11 db output ip3 15 to 50 c ?40 to +85 c 14 13 15 dbm output p1db 5dbm input impedance external match to 50 ? and ac coupled. 200 ? mixer spurious performance: 2x(lo ? rf); (lo ? rf)/2 3x(lo ? rf); (lo ? rf)/3 lo = ?10 dbm rf = ?50 dbm ?59 ?60 ?60 dbc dbc
CX74036 receive rf ic 8 conexant ? proprietary 101105a data subject to change october 17, 2000 table 6. electrical characteristics (3 of 5) vcc = 3.0 v, t a = 25 o c parameter symbol test conditions minimum typical maximum units mix 1900 (continued) output impedance set externally using defined circuit topology. 400 ? lo input port impedance internal match. external ac coupled 50 ? lo input port load isolation active/standby transition ?20 db required lo level ?13 ?10 ?5 dbm lo to rf port isolation referenced to lo input pin 30 db lo to if port isolation referenced to lo input pin 20 db mix-2 input frequency range 120 180 mhz output frequency 450 khz power gain ?40 to +85 c 15 db of power gain = 22 db of volt gain 14 15 16 db noise figure 15 to 50 c ?40 to +85 c 12 13 14 db input impedance differential, possible to use single-ended also 400 ? output p1db ?8 dbm output ip3 15 to 50 c ?40 to +85 c 1 0 2dbm required lo level for external source high input impedance. in place of the internal vco 300 mvp-p lo leakage at rf port assuming 50 ? calculation or match ?40 dbm lo leakage at if port assuming 50 ? calculation or match ?30 dbm output impedance single-ended 1.8k 2k 2.2k ? vga 450 frequency range 300 450 500 khz dynamic range 70 db maximum voltage gain maximum power gain 54 70 db db input noise figure, maximum gain input noise figure, minimum gain 43 15 db input p1db @ gain = 0 db ?20 dbm output ip3 @ gain = 0 db ip3 will remain constant over the entire gain range ?10 dbm input impedance differential 2k ? gain slope 45 db/v vga control analog control voltage 0.25 2.5 v
receive rf ic CX74036 101105a conexant ? proprietary 9 october 17, 2000 data subject to change table 6. electrical characteristics (4 of 5) vcc = 3.0 v, t a = 25 o c parameter symbol test conditions minimum typical maximum units i/q demod + lfamp voltage gain 30 db noise figure 25 db filter response 2 poles @ 200 khz input p1db ?20 dbm output load termination 10 k ? // 5 pf output signal level differential. 2.0 vp-p represents 1 db compression point. 0.5 2.0 vp-p output ip3 calculated using 50 ? 15 to 50 c ? 40 to + 85 c 18 16 20 dbm i/q gain imbalance 0.25 db i/q phase imbalance 2degrees dc offset: i to /i and q to /q i channel to q channel i and q to dc bias 20 30 8 mv mv mv if buffered output voltage gain 20 db output signal level differential 0.16 vp-p frequency 450 khz pll synthesizer input reference frequency 14.40 19.44 mhz reference divider ratio steps of unity 18 2047 feedback divider input frequency 90 250 mhz feedback divider ratio 16/17 prescaler, steps of unity 256 2667 phase detector noise floor ?154 dbc/hz phase detector gain 0.32 ma/rad if vco frequency 90 150 250 mhz tuning sensitivity 10 mhz/v harmonic levels tbd dbc phase noise @ 60 khz external tank circuitry, uses 0603 size multilayer resonator inductor. ?40 to 85 c ?113 ?110 dbc/hz programmable divider (div-p) input frequency from internal vco or reference oscillator input (refin) 150 or 19.44 input mhz output frequency 1.8 mhz counter ratio 8 255 external input level internal divider disabled 250 mvp-p
CX74036 receive rf ic 10 conexant ? proprietary 101105a data subject to change october 17, 2000 table 6. electrical characteristics (5 of 5) vcc = 3.0 v, t a = 25 o c parameter symbol test conditions minimum typical maximum units 3-wire bus data to clock setup time (see figure 5) t cs 50 nsec data to clock hold time (see figure 5) t ch 100 nsec clock pulse width high (see figure 5) t cwh 50 nsec clock pulse width low (see figure 5) t cwl 50 nsec clock to load enable setup time (see figure 5) t es 50 nsec load enable pulse width (see figure 5) t ew 50 nsec data clock en t cwh t cwl bit 00 t ch bit 35 t cs 101105a-5_101700 t ew t es figure 5. 3-wire bus timing diagram
receive rf ic CX74036 101105a conexant ? proprietary 11 october 17, 2000 data subject to change c924 top view side view all dimensions are in millimeters bottom view 7.00 C 0.10 7.00 C 0.10 1.20 C 0.10 mold substrate 0.30 C 0.05 0.300 C 0.05 0.355 C 0.05 0.500 3.450 3.450 exposed metal solder mask pin 1 indication r 2.225 pin 1 figure 6. 48-pin, 7x7 lga package dimensions
CX74036 receive rf ic 12 conexant ? proprietary 101105a data subject to change october 17, 2000 ordering information table 7. ordering information model name manufacturing part number receive rf ic CX74036 ? 2000, conexant systems, inc. all rights reserved. information in this document is provided in connection with conexant systems, inc. ("conexant") products. these materials are p rovided by conexant as a service to its customers and may be used for informational purposes only. conexant assumes no responsibility for errors or omissions in these materials. conexant may make changes to specifications and product descriptions at any time, without notice. conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. exce pt as provided in conexant?s terms and conditions of sale for such products, conexant assumes no liability whatsoever. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of conexant products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. conexant further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. conexant shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, los t revenues or lost profits, which may result from the use of these materials. conexant products are not intended for use in medical, lifesaving or life sustaining applications. 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. the following are trademarks of conexant systems, inc.: conexant?, the conexant c symbol, and ?what?s next in communications te chnologies??. product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. third-party b rands and names are the property of their respective owners. additional information, posted at www.conexant.com, is incorporated by reference. reader response : conexant strives to produce quality documentation and welcomes your feedback. please send comments and suggestions to tech.pu bs@conexant.com. for technical questions, contact your local conexant sales office or field applications engineer.
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