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data sheet conexant proprietary doc. no. 101103a data subject to change september 27, 2000 CX74037 transmit rf ic for tdma or amps applications conexant?s CX74037 transmit rf application-specific integrated circuit (asic) is a triple-mode, dual-band transmitter intended for use in is-136 compliant cellular phones. as a dual mode ic, it can be used in time division multiple access (tdma) mode or advanced mobile phone system (amps) mode. the device is available in a 48-pin 7x7 land grid array (lga) package with downset paddle. the CX74037 rf ic device includes the following functional components: ? in-phase and quadrature (i/q) modulator ? two intermediate frequency (if) voltage controlled oscillator (vco) inputs ? if variable gain amplifier (vga) ? two upconverters ? two drivers for external power amplifiers (pas). the CX74037 48-pin, 7x7 lga package pin configuration is shown in figure 1. a CX74037 block diagram is shown in figure 2. features ? sectional enable lines for independent control of circuits within the chip ? 90 db if vga range ? separate if frequencies can be used for the 800 mhz (amps) and 1900 mhz bands (pcs) ? dual drivers for 800 mhz and 1900 mhz ? pa driver is deactivated by using the driver enable signal when there is no transmission ? available in a 48-pin, 7x7 lga package with downset paddle applications ? cellular and/or pcs-band phones ? tdma and/or amps-mode phones ? portable battery powered equipment 101103a-1_080400 nc if_vco_in1- if_vco_in1+ nc nc nc vcc_div mix_cell_out pull_ena vcc_diff_drv mix_pcs_out nc nc vga_en lo_cell vcc_mix lo_pcs_in nc nc if_select if_vco_in2- if_vco_in2+ mode nc mix_in+ mix_in- vcc_if vga_gc vga_out- vga_out+ vcc_ld_pcs pot_cell drv_ena rf_pcs_out vcc_bias rf_cell_out band vcc_drv_cel pot_pcs vcc_mid_pcs drv_cell_in drv_pcs_in i_data+ i_data- vcc_mod q_data+ q_data- nc 1 2 3 4 5 6 7 8 9 10 11 12 13 35 34 33 32 31 30 29 28 27 26 25 36 37 45 46 47 48 44 43 42 41 40 39 38 17 16 15 14 18 19 20 21 22 23 24 figure 1. CX74037 48-pin, 7x7 lga package pin configuration
CX74037 transmit rf ic for tdma or amps applications data sheet conexant proprietary doc. no. 101103a data subject to change september 27, 2000 pcs-tdma rf out cell rf out pcs rf saw tx rfic CX74037 cell lo cell rf saw pcs lo lpf or bpf 2 if lo in vvga 101103a-2_080900 2 2 vcc i data q data interface vga en pa driver en pull en band select if select figure 2. CX74037 functional block diagram technical description the CX74037 is a tdma transmitter for the 800 mhz and 1900 mhz bands. it also can be used as an fm transmitter in amps mode at the 800 mhz band. a band select command chooses between the 800 mhz band and the 1900 mhz band. a mode select command chooses between tdma and amps mode. the chip consist of an i/q modulator, if lo input buffer, if vga, two upconverters for the 800 mhz and 1900 mhz bands, and two pa drivers for the 800 mhz and the 1900 mhz bands. i/q modulator . the i/q modulator converts the incoming i/q signal to an if signal using one of the two local oscillator inputs. this signal is fed directly to the vga amplifier. variable gain amplifier . the vga is a differential amplifier that receives its signal from the i/q modulator, amplifies it, and then is taken off-chip to be filtered before routing it to the upconverter. a dynamic range of 90 db is available on the amplifier. a dc voltage of 0.2 to 2.5 v is needed to control the gain of the amplifier. upconverters . the 800 mhz and 1900 mhz upconverters receive the if signal from the vga amplifier. each upconverter requires an external lo controlled by an external phase locked loop (pll). the band select command switches between the 800 mhz and the 1900 mhz bands. pa drivers . two pa drivers are included, the 800 mhz driver and the 1900 mhz driver. each driver takes its input from the upconverter after passing through an image rejection filter. the driver amplifies the signal and sends it to an external pa. electrical and mechanical specifications ________________ the signal pin assignments and functional pin descriptions are found in table 1. the absolute maximum ratings of the CX74037 are provided in table 2, the recommended operating conditions are specified in table 3. electrical characteristics for the CX74037 are shown in table 4. table 5 defines the control signal logic. figure 3 provides the package dimensions for the 48-pin, 7x7 lga package. esd sensitivity the CX74037 is a static-sensitive electronic device. do not operate or store near strong electrostatic fields. take proper esd precautions.
transmit rf ic for tdma or amps applications CX74037 101103a conexant ? proprietary 3 september 27, 2000 data subject to change table 1. CX74037 signal definition (1 of 2) pin no. name description 1 mix_in+ input to rf upconverters. internally ac coupled, high impedance. 2 mix_in- input to rf upconverters. internally ac coupled, high impedance. 3 vcc_if supply voltage for the agc amplifier. 4 vga_gc the input pin for agc gain control. a dc control voltage should be applied to this pin to vary the gain of the if amplif ier. 5 vga_out- vga output, open collector. external resistive (300 ohms) pull up to vcc required. 6 vga_out+ vga output, open collector. external resistive (300 ohms) pull up to vcc required. 7 vcc_ld_pcs supply voltage for the pcs last stage driver amplifier. 8 pot_cell this pin is connected to an external resistor. the value of the resistor will vary the bias current of the cellular dr iver. 9 drv_ena this is the input pin for the upconverter and the driver control signal. when the pin is low the driver and the upconverter are deactivated. 10 rf_pcs_out output pin for the pcs driver amplifier. impedance matching is required. 11 vcc_bias supply voltage of bias cells. 12 rf_cell_out output pin for the cellular driver amplifier. impedance matching is required. 13 band this is a control signal input pin. it selects between cellular band and pcs band. when the input is low, the cellular ba nd is chosen. when the input is high, the pcs band is chosen. 14 vcc_drv_cel supply voltage for the driver of the cellular band. 15 pot_pcs this pin is connected to an external resistor. the value of the resistor will vary the bias current of the pcs driver . 16 vcc_mid_pcs supply voltage for the first amplifier in the pcs driver block. 17 drv_cell_in the cellular driver amplifier input pin. impedance matching is required. 18 drv_pcs_in the pcs driver amplifier input pin. impedance matching is required. 19 i_data+ the baseband input for i channel. this is a balanced input. a dc bias has to be supplied to the pin. 20 i_data- same as pin 20, except complementary input. this pin should be pull low (0 v) in fm mode. 21 vcc_mod supply voltage for the i/q modulator. 22 q_data+ the baseband input for q channel. this is a balanced input. a dc bias has to be supplied to the pin. 23 q_data- same as pin 23, except complementary input. 24 nc there is no connection on this pin. should be tied to ground. 25 nc there is no connection on this pin. should be tied to ground. 26 nc there is no connection on this pin. should be tied to ground. 27 mix_pcs_out output of the pcs upconverter. impedance matching required. 28 vcc_diff_drv supply voltage for a differential amplifier in the upconverter block. 29 pull_ena this is a control signal input pin. when the input is low, the if vcos, rf mixer and buffers, and divide by 2 section s will be disabled. when the input is high, the mentioned sections will be enabled. 30 mix_cell_out output of the cellular upconverter. impedance matching required. 31 vcc_div supply voltage for the dividers and vco buffer. 32 nc there is no connection on this pin. should be tied to ground. 33 nc there is no connection on this pin. should be tied to ground. 34 nc there is no connection on this pin. should be tied to ground. 35 if vco in1+ input pin for the modulator lo signal. the frequency is 2xif. can be used single-ended. ac ground the unused pi n. 36 if vco in1- input pin for the modulator lo signal. the frequency is 2xif. can be used single-ended. ac ground the unused pi n. 37 nc there is no connection on this pin. should be tied to ground. 38 nc there is no connection on this pin. should be tied to ground. 39 mode this is a control signal input pin. when the input is low, the amps mode is selected. if the input is high, tdma mode is selected. fm output is 9 db higher at the modulator output. 40 if vco in2+ input pin for the modulator lo signal. the frequency is 2xif. can be used single-ended. ac ground the unused pi n. 41 if vco in2- input pin for the modulator lo signal. the frequency is 2xif. can be used single-ended. ac ground the unused pi n. 42 if_select control signal to select if vco input1 or input2. ? 1 ? will select if vco input1 and ? 0 ? will select if vco input2.
CX74037 transmit rf ic for tdma or amps applications 4 conexant ? proprietary 101103a data subject to change september 27, 2000 table 1. CX74037 signal definition (2 of 2) pin no. name description 43 nc connect to ground. 44 nc connect to ground. 45 lo_pcs_in this is the input pin for the local oscillator for the pcs band. it is internally matched. 46 vcc_mix supply voltage for the mixer in the upconverter block and for the lo buffer. 47 lo_cell this is the input pin for the local oscillator for the cellular band. it is internally matched. 48 vga_en this is a control signal input pin. when the input is low, the vga and i/q modulator sections will be disabled. when th e input is high, the mentioned sections will be enabled. table 2. absolute maximum ratings parameter symbol minimum typical maximum units supply voltage vcc ? 0.3 +5.0 v input voltage range ? 0.3 vcc v power dissipation 600 mw ambient operating temperature ? 30 +80 c storage temperature ? 40 +125 c table 3. CX74037 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 800 mhz tdma @ 7 dbm 75 ma supply current in 800 mhz amps @ 7 dbm 75 ma supply current in 800 mhz (drv_ena off) 45 ma supply current in 1900 mhz tdma @ 8.0 dbm 84 ma supply current in 1900 mhz tdma (drv_ena off) 48 ma supply current in sleep mode 20 a
transmit rf ic for tdma or amps applications CX74037 101103a conexant ? proprietary 5 september 27, 2000 data subject to change table 4. CX74037 electrical characteristics (1 of 3) vcc = 3.0 v, t a = 25 o c, plo = ? 10 dbm, input externally matched parameter symbol test conditions min typical max units if vco input input frequency range (2x if frequency) 100 640 mhz input signal level ? 10 ? 3+3dbm i/q modulator (output not measurable) input voltage level, differential 1.4 vp-p common mode input voltage level 1.4 1.85 2.1 v input dc offset 4mv input impedance 100k ? gain variation over process, temperature, vcc 0.4 db i/q gain mismatch 0.3 0.4 db i/q phase imbalance 2 4 degrees transmit vga vga frequency range ( ? 1 db bandwidth) 50 320 mhz vga gain (with a 600 ? differential load): maximum minimum 22 ? 64 24 ? 62 26 ? 60 db db vga gain variation with vcc 3.0 to 3.6 v @ vctrl 2 v ? 3+3db gain variation with temperature ? 1.0 +1.0 db gain control input impedance 40k ? vga gain slope 45 50 55 db/v vga gain control range 0.5 2.5 v gain slope variation over any 6 db segment ? 3+3db/v output power level @ 20 db gain ? 13 dbm p1db @ 22 db gain ? 3dbm nf @ 22 db gain 6db nf at -52 db gain 52 53 db operating temperature range ? 30 +25 +80 c cellular upconverter lo frequency range 1017 1043 mhz lo input return loss (reference to 50 ? ) ? 10 db output frequency 824 849 mhz output return loss from 824 mhz to 849 mhz (reference to 50 ? ) ? 15 db conversion gain 7 8 9 db gain degradation @ vcc 2.7 v 0.1 db acpr in 30 khz at 30 khz offset @ ? 5 dbm output; cascaded ? 33 dbc acpr in 30 khz at 60 khz offset @ ? 5 dbm output; cascaded ? 56 dbc
CX74037 transmit rf ic for tdma or amps applications 6 conexant ? proprietary 101103a data subject to change september 27, 2000 table 4. rf150 electrical characteristics (2 of 3) v dd = 2.7 v, ? 40 o c < t a < +85 o c, unless specified parameter symbol test conditions min typical max units cellular upconverter (continued) output p1db 2 3 dbm noise figure @ 8 db gain 12 13 db lo to rf leakage @ maximum gain, lo = ? 10 dbm ? 35 dbm operating temperature range ? 30 +25 +80 c pcs upconverter lo frequency range 2078 2139 mhz lo input return loss (reference to 50 ? ) ? 10 db output frequency 1850 1910 mhz conversion gain 8 9 10 db acpr in 30 khz at 30 khz offset @ ? 4 dbm output; cascaded ? 33 dbc acpr in 30 khz at 60 khz offset @ ? 4 dbm output; cascaded ? 57 dbc noise figure @ 9 db gain 910db p1db 0dbm lo to rf leakage @ maximum gain, lo = ? 15 dbm ? 35 dbm operating temperature range ? 30 +25 +80 c cellular pa driver output frequency 824 849 mhz gain 13 14 15 db output power level @ 14 db gain 7 dbm input return loss (reference to 50 ? ) ? 15 db output p1db 14.5 dbm acpr in 30 khz band at 30 khz offset @ 7 dbm output; cascaded ? 32 dbc acpr in 30 khz band at 60 khz offset @ 7 dbm output; cascaded ? 55 dbc output return loss (reference to 50 ? ) ? 15 db noise figure 68db operating temperature range ? 30 +25 +80 c external bias resistor value for +14.5 dbm p1db 120 ?
transmit rf ic for tdma or amps applications CX74037 101103a conexant ? proprietary 7 september 27, 2000 data subject to change table 4. rf150 electrical characteristics (3 of 3) v dd = 2.7 v, ? 40 o c < t a < +85 o c, unless specified parameter symbol test conditions min typical max units pcs pa driver input return loss (reference to 50 ? ) ? 15 db output frequency 1850 1910 mhz gain 15 16 17 db output power level @ 16 db gain 8.0 dbm output p1db 14 dbm acpr in 30 khz band at 30 khz offset @ 8.0 dbm output; cascaded ? 32 dbc acpr in 30 khz band at 60 khz offset @ 8.0 dbm output; cascaded ? 55 dbc output return loss (reference to 50 ? ) ? 15 db noise figure 910db operating temperature range ? 30 +25 +80 c external bias resistor value for +16 dbm of p1db 130 ? table 5. control signal truth table signal name logic 1 logic 0 remark vga_ena on off drv_ena on off cell and pcs band band pcs cell pull_ena on off if vco, rf mixer buffers, divide-by-2 if_select if vco in1 if vco in2 mode tdma fm in fm mode: normal dc bias on i+, 0 v bias on i ?
CX74037 transmit rf ic for tdma or amps applications 8 conexant ? proprietary 101103a data subject to change september 27, 2000 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 r2.225 pin 1 figure 3. CX74037 package dimensions for a 48-pin, 7x7 lga package
transmit rf ic for tdma or amps applications CX74037 101103a conexant ? proprietary 9 september 27, 2000 data subject to change ordering information model name manufacturing part number transmit rf ic CX74037
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