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1. general description the sa602a is a low-power vhf monolithic doub le-balanced mixer with input amplifier, on-board oscillator, and voltage regulator. it is intended fo r high-performance, low-power communication systems. the guaranteed para meters of the sa602a make this device well-suited for cellular radio applications. the mixer is a ?gilbert cell? multiplier configuration which typically provides 18 db of gain at 45 mhz. the oscillator op erates to 200 mhz. it can be configured as a crystal oscillator, a tuned tank oscillator, or a buffer for an external lo. for higher frequencies, the lo input may be externally driven. the noise figure at 45 mhz is typically less than 5 db. the gain, intercept performance, low-power and noise characteristics make the sa602a a superior choice for high-performance battery operated equipment. it is available in an 8-lead so (surface-mount miniature package). 2. features and benefits ? low current consumption: 2.4 ma typical ? excellent noise figure: <4.7 db typical at 45 mhz ? high operating frequency ? excellent gain, interc ept and sensitivity ? low external parts count; suitabl e for crystal/ceramic filters ? sa602a meets cellular radio specifications 3. applications ? cellular radio mi xer/oscillator ? portable radio ? vhf transceivers ? rf data links ? hf/vhf frequency conversion ? instrumentation frequency conversion ? broadband lans sa602a double-balanced mixer and oscillator rev. 3 ? 27 may 2014 product data sheet
sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 2 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 4. ordering information 4.1 ordering options 5. block diagram table 1. ordering information type number package name description version sa602ad/01 so8 plastic small outline package; 8 leads; body width 3.9 mm sot96-1 table 2. ordering options type number orderable part number package packing method minimum order quantity temperature sa602ad/01 sa602ad/01,112 so8 standard marking * ic?s tube - dsc bulk pack 2000 t amb = ? 40 ? c to +85 ?c sa602ad/01,118 so8 reel 13? q1/t1 standard mark smd 2500 t amb = ? 40 ? c to +85 ?c fig 1. block diagram aaa-013202 876 1234 in_a in_b gnd out_a v cc osc_e osc_b oscillator eb voltage regulator 5 out_b sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 3 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 6. pinning information 6.1 pinning 6.2 pin description fig 2. pin configuration for so8 sa602ad/01 in_a v cc in_b osc_e gnd osc_b out_a out_b aaa-013201 1 2 3 4 6 5 8 7 table 3. pin description symbol pin description in_a 1 rf input a in_b 2 rf input b gnd 3 ground out_a 4 mixer output a out_b 5 mixer output b osc_b 6 oscillator input (base) osc_e 7 oscillator output (emitter) v cc 8 supply voltage sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 4 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 7. functional description the sa602a is a gilbert cell, an oscillator/ buffer, and a temperat ure-compensated bias network as shown in figure 3 . the gilbert cell is a differen tial amplifier (in_a and in_b pins) that drives a balanced switching cell. th e differential input stage provides gain and determines the noise figure and signal handling performance of the system. the sa602a is designed for optimum low-power performance. when used with the sa604a as a 45 mhz cellular radio second if and demodulator, the sa602a is capable of receiving ? 119 dbm signals with a 12 db s/n ratio. third-order intercept is typically ? 13 dbm (that is approximately +5 dbm output intercept because of the rf gain). the system designer must be cognizant of this large signal limitation. when designing lans or other closed systems where transmission le vels are high, and small-signal or signal-to-noise issues are not critical, the input to the sa602a should be appropriately scaled. besides excellent low-power performance well into vhf, the sa602a is designed to be flexible. the input, rf mixer output and osc illator ports support various configurations provided the designer understands certain constraints, which are explained here. the rf inputs (in_a and in_b pins) are biased internally. they are symmetrical. the equivalent ac input impeda nce is approximately 1.5 k ??? 3 pf through 50 mhz. in_a and in_b pins can be used interchangeably, but they should not be dc biased externally. figure 4 shows three typical input configurations. fig 3. equivalent circuit aaa-013205 18 k 25 k buffer 6 7 bias 1.5 k 4 1.5 k 5 bias 1 1.5 k 3 gnd 1.5 k bias 2 sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 5 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator the mixer outputs (out_a and out_b pins) are also internally biased. each output is connected to the internal positive supply by a 1.5 k ? resistor. this permits direct output termination yet a llows for balanced output as well. figure 5 shows three single-ended output configurations and a balanced output. a. single-ended tuned input b. balanced input (for attenuation of second-order products) c. single-ended untuned input fig 4. input configuration aaa-013216 sa602a 1 2 input aaa-013217 sa602a 1 2 aaa-013218 sa602a 1 2 a. single-ended ceramic filter b. single-ended crystal filter c. single-ended ift d. balanced output fig 5. output configuration sa602a 4 5 aaa-013219 sa602a 4 5 aaa-013220 sa602a 4 5 aaa-013221 sa602a 4 5 aaa-013222 sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 6 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator the oscillator can sustain oscillation bey ond 200 mhz in crystal or tuned tank configurations. the upper limit of operation is determined by tank ?q? and required drive levels. the higher the ?q? of the tank or th e smaller the required drive, the higher the permissible oscillation frequency. if the requir ed lo is beyond oscillation limits, or the system calls for an external lo, the external signal can be injected at osc_b (pin 6) through a dc blocking capacitor. external lo should be at least 200 mv (peak-to-peak). figure 6 shows several proven oscillator circuits. figure 6 a is appropriate for cellular radio. as shown, an overtone mode of operation is utilized. capaci tor c3 and inductor l1 suppress oscillation at the crystal fundamental frequency . in the fundamental mode, the suppression network is omitted. figure 7 shows a colpitts varactor tuned tank os cillator suitable for synthesizer-controlled applications. it is important to buffer the outp ut of this circuit to assure that switching spikes from the first counter or prescaler do not end up in the oscillator spectrum. the dual-gate mosfet provides optimum isolation with low current. the fet offers good isolation, simplicity, and lo w current, while the bipolar transistors provide the simple solution for non-critical applications. the resi stive divider in the emitter-follower circuit should be chosen to provide the minimum in put signal that assures correct system operation. when operated above 100 mhz, the oscillator may not start if the q of the tank is too low. a 22 k ? resistor from osc_e (pin 7) to ground increases the dc bias current of the oscillator transistor. this improves the ac ope rating characteristic of the transistor and should help the oscillator to start. a 22 k ? resistor does not upset the other dc biasing internal to the device, but smaller resistance values should be avoided. a. colpitts crystal oscillator (overtone mode) b. colpitts l/c tank oscillator c. hartley l/c tank oscillator fig 6. oscillator circuits sa602a aaa-013237 1 2 3 4 6 5 8 7 c1 c3 c2 xtal l1 sa602a aaa-013238 1 2 3 4 6 5 8 7 sa602a aaa-013239 1 2 3 4 6 5 8 7 sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 7 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 8. application design-in information fig 7. colpitts oscillator suitable for sy nthesizer applications and typical buffers sa602a aaa-013258 1 2 3 4 6 5 8 7 0.1 f 5.5 h 10 f 10 nf +6 v to buffer 7 pf 10 pf 1000 pf 0.06 h 1000 pf dc control voltage from synthesizer mv2105 or equivalent 0.01 f 2 k to synthesizer 330 3sk126 0.01 f 100 k 1.0 nf 100 k 100 k 2 pf to synthesizer 2n5484 2n918 fig 8. typical application for cellular radio aaa-013257 sa602a 1 2 45 mhz rf input 47 pf 220 pf 100 nf 0.209 h to 0.283 h 3 4 6 5 8 7 10 pf 1 nf 22 pf 44.545 mhz third overtone crystal 0.5 h to 1.3 h output 10 nf 100 nf 5.5 h v cc 6.8 f sfg455a3 or equivalent sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 8 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 9. limiting values 10. thermal characteristics 11. static characteristics 12. dynamic characteristics table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit v cc supply voltage - 9 v t stg storage temperature ? 65 +150 ?c t amb ambient temperature operating ? 40 +85 ?c table 5. thermal characteristics symbol parameter conditions min max unit z th(j-a) transient thermal impedance from junction to ambient -90 ? c/w table 6. static characteristics v cc =+6v; t amb =25 ? c; unless specified otherwise. symbol parameter conditions min typ max unit v cc supply voltage 4.5 - 8.0 v i cc supply current - 2.4 2.8 ma table 7. dynamic characteristics t amb =25 ? c; v cc = +6 v; unless specified otherwise. symbol parameter conditions min typ max unit f i input frequency - 500 - mhz f osc oscillator frequency - 200 - mhz nf noise figure at 45 mhz - 5.0 5.5 db ip3 i input third-order intercept point rf input = ? 45 dbm; rf1 = 45.0 mhz; rf2=45.06mhz - ? 13 ? 15 dbm g conv conversion gain at 45 mhz 14 17 - db r i(rf) rf input resistance 1.5 - - k ? c i(rf) rf input capacitance - 3 3.5 pf r o(mix) mixer output resistance out_a, out_b pins - 1.5 - k ? sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 9 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 13. performance curves fig 9. supply current versus temperature fig 10. conversion gain versus temperature fig 11. third-order intercept point versus temperature fig 12. noise figure versus temperature rf1 = 45 mhz; if = 455 khz; rf2 = 45.06 mhz fig 13. third-order inte rcept and compression fig 14. input th ird-order intercept point versus supply voltage 1.5 3.0 2.5 2.0 3.5 i cc (ma) aaa-013241 t amb (c) ?40 90 ?20 0 20 40 60 80 v cc = 8.5 v 6.0 v 4.5 v 16.0 18.0 20.0 g conv (db) 14.0 aaa-013242 t amb (c) ?40 90 ? 200 20406080 v cc = 8.5 v 6.0 v 4.5 v ?14.0 ?12.0 ?10.0 ip3 i (dbm) ?16.0 aaa-013243 t amb (c) ?40 90 ?20 0 20 40 60 80 4.0 5.5 5.0 4.5 6.0 nf (db) aaa-013244 t amb (c) ?40 90 ?20 0 20 40 60 80 v cc = 8.5 v 6.0 v 4.5 v rf input level (dbm) ?80 20 0 ?40 ?20 ?60 aaa-013245 ?40 0 40 ?80 if output power (dbm) third-order product fund. product aaa-013246 v cc (v) 410 8 6 ?18 ?12 ?14 ?16 ?10 ip3 i (dbm) sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 10 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 14. test information fig 15. test configuration aaa-013203 sa602a 1 2 45 mhz rf input 47 pf 220 pf 100 nf 0.209 h to 0.283 h 3 4 6 5 8 7 10 pf 1 nf 22 pf 44.545 mhz third overtone crystal 0.5 h to 1.3 h 303 h to 765 h 100 nf 560 pf 330 pf 455 khz if output 10 nf 100 nf 5.5 h v cc 6.8 f sa602a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2014. all rights rese rved. product data sheet rev. 3 ? 27 may 2014 11 of 19 nxp semiconductors sa602a double-balanced mixer and oscillator 15. package outline fig 16. package outline sot96-1 (so8) 8 1 , 7 $ p d [ $ $ $ e s f ' ( h + ( / / s 4 = \ z y 5 ( ) ( 5 ( 1 & |