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1. general description the sa604a is an improved mono lithic low-power fm if system incorporating two limiting intermediate frequency amplifiers, quadrature detector, muting, logarithmic received signal strength indicator, and voltage regulator. the sa604a features higher if bandwidth (25 mhz) and temperature compensated rssi and limiters providing wide rssi dynamic range, high if/limiter gain and overall stab ility. the sa604a is available in an so16 (surface-mounted miniature) and hxqfn16 package. 2. features and benefits ? low power consumption: 3.3 ma typical ? temperature compensated logarithmic receiv ed signal strength indicator (rssi) with a dynamic range in excess of 90 db ? two audio outputs ? muted and un-muted ? low external component count; suit able for crystal/ ceramic filters ? excellent sensitivity: 1.5 ? v across input pins (0.22 ? v into 50 ? matching network) for 12 db sinad (signal-to-noise an d distortion ratio) at 455 khz ? sa604a meets cellular radio specifications 3. applications ? cellular radio fm if ? high-performance communications receivers ? intermediate frequency amplification and detection up to 25 mhz ? rf level meter ? spectrum analyzer ? instrumentation ? fsk and ask data receivers sa604a high-performance low -power fm if system rev. 4.1 ? 30 march 2015 product data sheet
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 2 of 31 nxp semiconductors sa604a high-performance low-power fm if system 4. ordering information 4.1 ordering options table 1. ordering information type number topside marking package name description version sa604ad/01 sa604ad so16 plastic small outline package; 16 leads; body width 3.9 mm sot109-1 sa604ahr 04a hxqfn16 plastic thermal enhanc ed extremely thin quad flat package; no leads; 16 terminals; body 3 ? 3 ? 0.5 mm sot1039-2 table 2. ordering options type number orderable part number package packing method minimum order quantity temperature sa604ad/01 sa604ad/01,112 so16 standard marking * ic?s tube - dsc bulk pack 1000 t amb = ? 40 ? c to +85 ? c sa604ad/01,118 so16 reel 13? q1/t1 *standard mark smd 2500 t amb = ? 40 ? c to +85 ? c sa604ahr sa604ahrz hxqfn16 reel 7? q2/t3 *standard mark smd 1500 t amb = ? 40 ? c to +85 ? c
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 3 of 31 nxp semiconductors sa604a high-performance low-power fm if system 5. block diagram pin numbers for so16; hxqfn16 pins shown in parentheses fig 1. block diagram of sa604a aaa-012738 voltage regulator signal strength indicator 1(14) 2(15) 3(16) 4(1) 5(2) 6(3) 7(4) 8(5) 16(13) 15(12) 14(11) 13(10) 12(9) 11(8) 10(7) 9(6) gnd v cc gnd mute if amp limiter quadrature detector if_amp_input if_amp_decoupl if_amp_output limiter_input limiter_decoupl limiter_decoupl limiter_output if_amp_decoupl mute_input rssi_output mute_aud_outp unmute_aud_outp quadrature_input
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 4 of 31 nxp semiconductors sa604a high-performance low-power fm if system 6. pinning information 6.1 pinning fig 2. pin configuration for so16 (1) die attach paddle (dap). fig 3. pin configuration for hxqfn16 sa604ad/01 if_amp_decoupl if_amp_input gnd if_amp_decoupl mute_input if_amp_output v cc gnd rssi_output limiter_input mute_aud_outp limiter_decoupl unmute_aud_outp limiter_decoupl quadrature_input limiter_output aaa-012737 1 2 3 4 5 6 7 8 10 9 12 11 14 13 16 15 aaa-016798 sa604ahr (1) transparent top view unmute_aud_outp limiter_input mute_aud_outp gnd rssi_outp if_amp_output v cc if_amp_decoupl quadrature_input limiter_output limiter_decoupl limiter_decoupl mute_input gnd if_amp_decoupl if_amp_input 4 9 3 10 2 11 1 12 5 6 7 8 16 15 14 13 terminal 1 index area
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 5 of 31 nxp semiconductors sa604a high-performance low-power fm if system 6.2 pin description [1] hxqfn16 package supply ground is connected to both g nd pin and exposed center pad. gnd pin must be connected to supply ground for pr oper device operation. for enhanced thermal, electrical, and board level performance, the exposed pad must be solder ed to the board using a corresponding thermal pad on the board. for proper heat conduction through the board, thermal vias must be incorporated in the pcb in the thermal pad region. table 3. pin description symbol pin description so16 hxqfn16 if_amp_decoupl 1 14 if amplifier decoupling gnd 2 15 ground mute_input 3 16 mute input v cc 4 1 supply voltage rssi_output 5 2 rssi output mute_aud_outp 6 3 mute audio output unmute_aud_outp 7 4 unmute audio output quadrature_input 8 5 quadrature input limiter_output 9 6 limiter output limiter_decoupl 10 7 limiter decoupling limiter_decoupl 11 8 limiter decoupling limiter_input 12 9 limiter input gnd 13 10 [1] ground if_amp_output 14 11 if amplifier output if_amp_decoupl 15 12 if amplifier decoupling if_amp_input 16 13 if amplifier input - - dap exposed die attach paddle
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sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 7 of 31 nxp semiconductors sa604a high-performance low-power fm if system 8. limiting values 9. thermal characteristics 10. static 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 typ unit z th(j-a) transient thermal impedance from junction to ambient so16 package 90 k/w hxqfn16 package 75 k/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 2.5 3.3 4.0 ma v th threshold voltage mute switch-on 1.7 - - v mute switch-off - - 1.0 v
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 8 of 31 nxp semiconductors sa604a high-performance low-power fm if system 11. dynamic characteristics [1] sa604 data sheet refers to power at 50 ? input termination; about 21 db less po wer actually enters the internal 1.5 k ? input. see table 8 . the sa605 and sa604a are both derived from the same basic die. the sa605 performance plots are directly applicable to the sa604 a. table 7. dynamic characteristics typical reading at t amb =25 ? c; v cc = 6 v, unless specified otherwise. if frequency = 455 khz; if level = ? 47 dbm; fm modulation = 1 khz with ? 8 khz peak deviation. audio output with c-message weighted filter and de-emphasis capacitor. test circuit figure 14 . the parameters listed below are tested using automatic test equipment to assure consistent electrical characteristics. the limits do not represent the ultimate perf ormance limits of the device. use of an optimized rf layout will improve many of the listed parameters. symbol parameter conditions min typ max unit input limiting -3 db test at pin if_amp_input; per 50 ? - ? 92 - dbm ? am am rejection 80 % am 1 khz 30 34 - db recovered audio level 15 nf de-emphasis; rms value 80 175 260 mv 150 pf de-emphasis; rms value - 530 - mv thd total harmonic distortion ? 34 ? 42 - db s/n signal-to-noise ratio no modulation for noise - 73 - db v o(rssi) rssi output voltage rf level = ? 118 dbm [1] 0 160 650 mv rf level = ? 68 dbm [1] 1.9 2.65 3.1 v rf level = ? 18 dbm [1] 4.0 4.85 5.6 v ? rssi(range) rssi range r4 = 100 k ? (pin rssi_output) - 90 - db rssi accuracy r4 = 100 k ? (pin rssi_output) - ? 1.5 - db z i(if) if input impedance 1.4 1.6 - k ? z o(if) if output impedance 0.85 1.0 - k ? z i(lim) limiter input impedance 1.4 1.6 - k ? r o output resistance unmuted audio - 58 - k ? muted audio - 58 - k ? table 8. sa604 versus sa604a rssi output voltage sa604 (50 ? ) sa604a (1.5 k ? ) / sa605 (1.5 k ? ) ? 97 dbm ? 118 dbm ? 47 dbm ? 68 dbm +3 dbm ? 18 dbm
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 9 of 31 nxp semiconductors sa604a high-performance low-power fm if system 12. performance curves normalized if frequency: (1) q = 10 (2) q = 20 (3) q = 40 (4) q = 60 (5) q = 80 (6) q = 100 fig 5. phase as a function of normalized if frequency ddd - ? ? 1 ------ 1 ?? ? 1 ------- - +=
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 10 of 31 nxp semiconductors sa604a high-performance low-power fm if system 13. application information fig 6. typical application cellular radio (45 mhz rf input and 455 khz if) aaa-012739 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 sa604a 10 pf 0.1 f data out audio out 100 k rssi +6 v mute 0.1 f 0.1 f 0.1 f 455 khz ceramic filter 0.1 f 0.1 f 8 7 6 5 1 2 3 4 sa602a 45 mhz +6 v 100 nf 5.5 h 10 nf 6.8 f rf input 0.21 h to 0.28 h 100 nf 47 pf 220 pf 455 khz q = 20 c-msg filter 455 khz ceramic filter 5.6 pf 0.5 h to 1.3 h 1 nf 22 pf sa604a test circuit 44.545 3rd overture xtal
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 11 of 31 nxp semiconductors sa604a high-performance low-power fm if system 13.1 circuit description the sa604a is a very high gain, high frequen cy device. correct operation is not possible if good rf layout and gain stage practices are not used. the sa604a cannot be evaluated independent of circuit, components, and board layout. a physical layout which correlates to the electr ical limits is shown in figure 17 . this configuration can be used as the basis for production layout. the sa604a is an if signal processing system suitable for if frequencies as high as 21.4 mhz. the device consists of two limiting amplifiers, quadrature detector, direct audio output, muted audio output, and signal strength indicator (with log output characteristic). the equivalent circuit is shown in figure 4 . figure 7 is the performance of the typical cellular radio application shown in figure 6 with 45 mhz rf input and 455 khz if. audio output: c message weighted; 0 db reference = recovered audio for 8 khz peak deviation (db) fig 7. performance of the typical cellular radio application audio rssi (volts) thd + noise noise am (80 % mod) aaa-012849 10 ?120 ?80 1 2 3 4 ?60 ?40 ?20 (db) noise a m (80 % mod) thd + noise rssi (v) ?100 ?80 ?60 ?40 ?20 100 1 k sa604a if input (v) (1500 ) sa602a rf input (dbm) (50 ) 100 k 10 k 0
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 12 of 31 nxp semiconductors sa604a high-performance low-power fm if system 13.2 if amplifiers the if amplifier section consists of two lo g-limiting stages. the fi rst consists of two differential amplifiers with 39 db of gain and a small signal bandwidth of 41 mhz (when driven from a 50 ? source). the output of the first limiter is a low-impedance emitter follower with 1 k ? of equivalent series resistance. th e second limiting stage consists of three differential amplifiers with a gain of 62 db and a small signal ac bandwidth of 28 mhz. the outputs of the final differential st age are buffered to the internal quadrature detector. one of the outputs is available at pin limiter_output to drive an external quadrature capacitor and l/c quadrature tank. both of the limiting amplifier stages are dc biased using feedback. the buffered output of the final differential amplifier is fed back to the input through 42 k ?? resistors. as shown in figure 4 , the input impedance is established for each stage by tapping one of the feedback resistors 1.6 k ? from the input. it requires one additional decoupling capacitor from the tap point to ground. because of the very high gain, bandwidth and input impedance of the limiters, there is a very real potential for instability at if fr equencies above 455 khz. the basic phenomenon is shown in figure 10 . distributed feedback (capacitance, inductance and radiated fields) forms a divider from the output of the limiters back to the inputs (including rf input). if this feedback divider does not cause attenuation greater than the gain of the forward path, then oscillation or low-level regeneration is likely. if regeneration occurs, two symptoms may be present: 1. the rssi output is high with no signal input (should nominally be 250 mv or lower). 2. the demodulated output demonstrates a threshold. above a certain input level, the limited signal begins to dominate the regeneration, and the demodulator begins to operate in a normal manner. there are three primary ways to deal with regeneration: 1. minimize the feedback by gain stage isolation. 2. lower the stage input impedances, thus increasing the feedback attenuation factor. 3. reduce the gain. gain reduction can effectively be accomplished by adding attenuation between stages, which can also lower the input impedance. examples of impedance/gain adjustment are shown in figure 11 . reduced gain results in reduced limiting sensitivity. a feature of the sa604a if amplifiers, which is not specified, is low phase shift. the sa604a is fabricated with a 10 ghz process with very small collector capacitance. it is advantageous in some applications that th e phase shift changes only a few degrees over a wide range of signal input amplitudes.
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 13 of 31 nxp semiconductors sa604a high-performance low-power fm if system fig 8. first limiter bias fig 9. second limiter and quadrature detector ddd 9 ddd 9 n n n n fig 10. feedback paths a. terminating high impedance filters with transformation to low impedance b. low impedance termination and gain reduction fig 11. practical termination ddd %3) %3) ddd %3) kljklpshgdqfh kljklpshgdqfh orzlpshgdqfh %3) ddd %3) uhvlvwlyhorvvlqwr%3) $ %3)
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 14 of 31 nxp semiconductors sa604a high-performance low-power fm if system 13.3 stability considerations the high gain and bandwidth of the sa604a in combination with its very low currents permit circuit implementation with superior perf ormance. however, stability must be maintained and, to do that, every possible feedback mechanism must be addressed. these mechanisms are: ? supply lines and ground ? stray layout inductances and capacitances ? radiated fields ? phase shift as the system if increases, so must the atte ntion to fields and strays. however, ground and supply loops cannot be overlooked, especia lly at lower frequencies. even at 455 khz, if the supply line is not decoup led, using the test layout in figure 17 , instability occurs. to decouple, use two high-quality rf capacitors, a 0.1 ? f monolithic on the v cc pin, and a 6.8 ? f tantalum on the supply line. an electr olytic is not an adequate substitute. at 10.7 mhz, a 1 ? f tantalum has proven acceptable with this layout. every layout must be evaluated on its own merit, but do not underestimate the importance of good supply bypass. at 455 khz, if the layout of figure 17 or one substantially simila r is used, ceramic filters can be connected directly to the input and between limiter stages with no special consideration. at frequencies above 2 mhz, some input impedance reduction is usually necessary. figure 11 demonstrates a practical means. as illustrated in figure 12 , 430 ? external resistors are applied in parallel to the internal 1.6 k ? load resistors, thus presenting approximately 330 ? to the filters. the input filter is a crystal type for narrowband selectivity. the filter is terminat ed with a tank which transforms to 330 ? . the interstage filter is a cerami c type which does not contribute to system selectivity, but does suppress wid eband noise and stray signal pickup. in wideband 10.7 mhz ifs the input filter can also be ceramic, directly connected to pin if_amp_input. fig 12. crystal input filter with ceramic interstage filter 1 23 sa604a 430 430 45678 16 15 14 13 12 11 10 9 aaa-012850
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 15 of 31 nxp semiconductors sa604a high-performance low-power fm if system in some products, it may be impractical to utilize shielding, but this mechanism may be appropriate to 10.7 mhz and 21.4 mhz if. one of the benefits of low current is lower radiated field strength, but lower does not me an non-existent. a spectrum analyzer with an active probe clearly shows if energy with th e probe held in the proximity of the second limiter output or quadrature coil. no specific recommendations are provided, but mechanical shielding should be considered if layout, bypass, and input impedance reduction do not solve a stubborn instability. the final stability consideration is phase shift. the phase shift of the limiters is very low, but there is phase shift contribution from the quadrature tank and the filters. most filters demonstrate a large phase shift across their passband (especially at the edges). if the quadrature detector is tuned to the edge of the filter pass band, the combined filter and quadrature p hase shift can aggravate stability. it is not usually a proble m, but should be kept in mind. 13.4 quadrature detector figure 9 shows an equivalent circuit of the sa604 a quadrature detector. it is a multiplier cell similar to a mixer stage. instead of mixi ng two different frequencies, it mixes two signals of common frequency but different phase. internal to the device, a constant amplitude (limited) signal is differentially a pplied to the lower port of the multiplier. the same signal is applied single-ended to an external capacitor at pin limiter_output. there is a 90 ? phase shift across the plates of this capacitor. the phase shifted signal applied to the upper port of the multiplier is at pin quadrature_input . a quadrature tank (parallel l/c network) permits frequency selective phase shifting at the if frequency. this quadrature tank must be returned to ground through a dc blocking capacitor. the loaded q of the quadrature tank impacts three fundamental aspects of the detector: distortion, maximum modulated peak deviati on, and audio output amplitude. typical quadrature cu rves are illustrated in figure 5 . the phase angle translates to a shift in the multiplier output voltage. thus a small deviation gives a large output wi th a high q tank. however, as the deviation from resonance increases, the non-linearity of the curve increases (distortion). with too much deviation, the signal is outside the qua drature region (limiting the peak deviation which can be demodulated). if the same peak deviation is applied to a lower q tank, the deviation remains in a region of the curve which is more linear (less distortion). however, it creates a smaller phase angle (smaller output amplitude). thus the q of the quadrature tank must be tailored to the design. basic equations and an example for determining q are shown in section 13.5 . this explanation includes first-order effects only.
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 16 of 31 nxp semiconductors sa604a high-performance low-power fm if system 13.5 frequency discriminator design equations (1) where: and from equation 1 , the phase shift between nodes 1 and 2, or the phase across c s will be: (2) figure 5 is the plot of as a function of . it is notable that at , the phase shift is and the response is close to a straight line with a slope of . the signal v o would have a phase shift of with respect to the v in . if v in =a sin( ? t) => (3) multiplying the two signals in the mi xer, and low pass filtering yields: (4) after low pass filtering => (5) fig 13. frequency discriminator ddd 9 rxw v o c s c p c s + ------------------- 1 1 ? 1 q 1 s --------- - ? 1 s ------ ?? ?? 2 ++ ---------------------------------------- v in ? ? = ? 1 1 lc p c s + ?? -------------------------------- = q 1 rc p c s + ??? 1 = ? < v o < v in ? t g ?? 1 ? ? 1 q 1 ? ---------- - 1 ? 1 ? ------ ?? ?? 2 ? ----------------------- ? == ? ? 1 ? ------ ?? ?? ?? 1 = ? 2 -- - ?? ?? ------- - 2q 1 ? 1 --------- - = ? 2 -- - 2q 1 ? 1 --------- - ? ? v o a ? t ? 2 -- - 2q 1 ? 1 --------- - ?? ?+ sin = v in v o ? a 2 ? sin t ? t ? 2 -- - 2q 1 ? 1 --------- - ?? ?+ sin ? = v o 1 2 -- - a 2 ? 2 -- - 2q 1 ? 1 --------- - ?? ? cos 1 2 -- - a 2 2q 1 ? 1 --------- - ?? sin ==
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 17 of 31 nxp semiconductors sa604a high-performance low-power fm if system (6) for << which is discriminated fm output. note that is the deviation frequency from the carrier 1 . example: at 455 khz if, with ? 5 khz fm deviation, the maximum normalized frequency is (455 ? 5)/455 khz = 1.010 or 0.990. go to the frequency as a function of normalized frequency curves ( figure 5 ) and draw a vertical straight line at = 1.01. the curves with q = 100, q = 40 are not linear, but q = 20 and less shows better linearity for this application. too small q decreases the amplitude of the discriminated fm signal. equation 6 => choose a q = 20. the internal resistance of the sa604a is 40 k ?? from , and then , it results that c p + c s = 174 pf and l = 0.7 mh. a more exact analysis including the source resistance of the previous stage shows a series and a parallel resonance in the phase detector tank. to make the parallel and series resonances close, and to get maxi mum attenuation of higher harmonics at 455 khz if, a c s = 10 pf and c p = 164 pf provided the best results. for commercial purposes, values of 150 pf or 180 pf may be practical. a variable inductor which can be adjusted around 0.7 mh should be chosen an d optimized for minimum distortion. (for 10.7 mhz, a value of c s = 1 pf is recommended.) 13.6 audio outputs two audio outputs are provided. both are pnp current-to-voltage converters with 55 k ? nominal internal loads. the unmuted output is always active to permit the use of signaling tones in systems such as cellular radio. the other output can be muted with 70 db typical attenuation. the two outputs have an internal 180 ? phase difference. the nominal frequency response of the audio outputs is 300 khz. this response can be increased with the addition of external resist ors between the output pins and ground. the resistors are placed in parallel with the internal 55 k ? resistors and they lower the output time constant. the output structure is a cu rrent-to-voltage converter where current is driven into the resistance, creating a voltage drop. by adding external parallel resistance, it also lowers the output audio amplitude and dc level. this technique of audio bandwidth expansion ca n be effective in many applications such as sca receivers and data transceivers. because the two outputs have a 180 ? phase relationship, fsk demodulation can be accomplished by applying the two outputs differentially across the inputs of an op amp or comparator. once the threshold of the reference frequency (or no-signal condition) has been established, the two outputs shift in opposite directions (higher or lower output voltage) as the input frequency shifts. the 1. ref. krauss, raab, bastian: solid-state radio eng.; wiley, 1980, p.311. v o 2q 1 ? ? 1 ------ ? 2q 1 ? 1 ?? + ? 1 -------------------- - ?? ?? = 2q 1 ? ? 1 ------ ? 2 -- - ?? ? 1 ? ? 1 ------ q 1 rc p c s + ??? 1 = ? 1 1 lc p c s + ?? -------------------------------- =
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 18 of 31 nxp semiconductors sa604a high-performance low-power fm if system output of the comparator is logic output. the choice of op amp or comparator depends on the data rate. with high if frequency (10 mhz and above), and wide if bandwidth (l/c filters) data rates in excess of 4 mbd are possible. 13.7 rssi the received signal strength indicator (r ssi), of the sa604a demonstrates monotonic logarithmic output over a range of 90 db. the signal strength output is derived from the summed stage currents in the limiting amplifiers. it is independent of the if frequency. thus, unfiltered signals at the limiter inputs , spurious products, or regenerated signals manifest themselves as rssi outputs. an rssi output of greater than 250 mv with no signal (or a very small signal) applied, is an indication of possible regeneration or oscillation. to achieve optimum rssi linearity, there must be a 12 db insertion loss between the first and second limiting amplifiers. with a typica l 455 khz ceramic filter, there is a nominal 4 db insertion loss in the filter. an additional 6 db is lost in the interface between the filter and the input of the second limiter. a small am ount of additional loss must be introduced with a typical ceramic filter. in the test ci rcuit used for cellular radio applications ( figure 6 ), the optimum linearity was achieved with a 5.1 k ? resistor. the resistor was placed between the output of the first limiter (pin if_amp_output) and the input of the interstage filter. with this resistor from pi n if_amp_output to the filter, sensitivity of 0.25 ? v for 12 db sinad was achieved. with the 3.6 k ? resistor, sensitivity was optimized at 0.22 ? v for 12 db sinad with minor change in the rssi linearity. any application requiring optimi zed rssi linearity, such as spectrum analyzers, cellular radio, and certain types of telemetry, requires careful attention to limiter interstage component selection. this is especially tr ue with high if frequencies which require insertion loss or impedan ce reduction for stability. at low frequencies, the rssi makes an excellent logarithmic ac voltmeter. for data applications, the rssi is effective as an amplitude shift keyed (ask) data slicer. if a comparator is applied to the rssi and the threshold set slightly above the no signal level, when an in-band signal is receiv ed the comparator is sliced. unlike fsk demodulation, the maximum data rate is limit ed. an internal capacitor limits the rssi frequency response to approximately 100 khz. at high data rates, the rise and fall times are not symmetrical. the rssi output is a current-to-voltage converter similar to the audio outputs. however, an external resistor is required. with a 91 k ? resistor, the output characteristic is 0.5 v for a 10 db change in the input amplitude. 13.8 additional circuitry internal to the sa604a are voltage and current regulators which have been temperature compensated to maintain the performance of the device over a wide temperature range. these regulators are not accessible to the user.
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 19 of 31 nxp semiconductors sa604a high-performance low-power fm if system 14. test information fig 14. sa604a test circuit aaa-012851 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 sa604a mute input rssi output audio output data output input c2 c4 f1 r2 c1 r1 r3 c6 c7 c8 r4 c11 c9 c10 c12 s1 f2 c5 c3 q = 20 loaded v cc table 9. sa604ad/01 demo board component list component value description c1 100nf, +80%, ? 20 %,63 v k10000-25v ceramic c2 100nf, +10%, 50v - c3 100 nf, ? 10 %, 50 v - c4 100nf, +10%, 50v - c5 100 nf, ? 10 %, 50 v - c6 10 pf, ? 2 %, 100 v npo ceramic c7 100 nf, ? 10 %, 50 v - c8 100 nf, ? 10 %, 50 v - c9 15 nf, ? 10 %, 50 v - c10 150 pf ? 2 %, 100 v n1500 ceramic c11 1 nf, ? 10 %, 100 v k2000-y5p ceramic c12 6.8 ? f ? 20 %, 25 v tantalum f1 455 khz ceramic filter murata sfg455a3 f2 455 khz, ce = 180 pf toko rmc 2a6597h r1 51 ? , ? 1 %, 1/4 w metal film r2 1500 ? , ? 1 %, 1/4 w metal film r3 1500 ? , ? 5 %, 1/8 w carbon composition r4 100 k ? , ? 1 %, 1/4 w metal film
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 20 of 31 nxp semiconductors sa604a high-performance low-power fm if system fig 15. components layout (viewed from the top) fig 16. bottom layout (viewed from the top) fig 17. print layout (viewed from the top) aaa-012852 if input signetics sa604a test ct mute gnd gnd gnd rssi v cc audio data off on aaa-012853 if input signetics sa604a test ct mute gnd gnd gnd rssi v cc audio data off on aaa-012854
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 21 of 31 nxp semiconductors sa604a high-performance low-power fm if system 15. package outline fig 18. package outline sot109-1 (so16) ; z 0 $ $ $ e s ' + ( / s 4 ghwdlo; ( = h f / y 0 $ $ $ \ slqlqgh[ 81,7 $ pd[ $ $ $ e s f ' ( h + ( / / s 4 = \ z y 5()(5(1&(6 287/,1( 9(56,21 (8523($1 352-(&7,21 ,668('$7( ,(& -('(& -(,7$ pp lqfkhv r r ',0(16,216lqfkglphqvlrqvduhghulyhgiurpwkhruljlqdoppgl phqvlrqv 1rwh 3odvwlfruphwdosurwuxvlrqvripplqfkpd[lpxp shuvlghduhqrwlqfoxghg 627 ( 06 pp vfdoh 62sodvwlfvpdoorxwolqhsdfndjhohdgverg\zlgwkp p 627
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 22 of 31 nxp semiconductors sa604a high-performance low-power fm if system fig 19. package outline sot1039-2 (hxqfn16) references outline version european projection issue date iec jedec jeita sot1039-2 - - - - - - sot1039-2_po 10-07-29 11-03-30 unit mm max nom min 0.5 0.05 0.00 0.127 3.1 3.0 2.9 1.95 1.85 1.75 3.1 3.0 2.9 0.5 1.5 0.40 0.35 0.30 0.1 a dimensions hxqfn16 plastic thermal enhanced extremely thin quad flat packae no leads 16 terminals body 3 x 3 x 0.5 mm sot1039-2 a 1 b 0.35 0.30 0.25 cdd h ee h 1.95 1.85 1.75 ee 1 e 2 1.5 lv 0.1 w 0.05 y 0.05 y 1 0 1 2 mm scale terminal 1 index area b a d e c y c y 1 x detail x a c a 1 b e 2 e 1 e e 1/2 e 1/2 e ac b v c w terminal 1 index area d h e h l 5 8 16 13 4 1 9 12
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 23 of 31 nxp semiconductors sa604a high-performance low-power fm if system 16. soldering of smd packages this text provides a very brief insight into a complex technology. a more in-depth account of soldering ics can be found in application note an10365 ?surface mount reflow soldering description? . 16.1 introduction to soldering soldering is one of the most common methods through which packages are attached to printed circuit boards (pcbs), to form electr ical circuits. the soldered joint provides both the mechanical and the electrical connection. th ere is no single sold ering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mount devices (smds) are mixed on one printed wiring board; however, it is not suitable for fine pitch smds. reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 16.2 wave and reflow soldering wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. the wave soldering process is suitable for the following: ? through-hole components ? leaded or leadless smds, which are glued to the surface of the printed circuit board not all smds can be wave soldered. packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. also, leaded smds with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased pr obability of bridging. the reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. leaded packages, packages with solder balls, and leadless packages are all reflow solderable. key characteristics in both wave and reflow soldering are: ? board specifications, in cluding the board finish , solder masks and vias ? package footprints, including solder thieves and orientation ? the moisture sensitivit y level of the packages ? package placement ? inspection and repair ? lead-free soldering versus snpb soldering 16.3 wave soldering key characteristics in wave soldering are: ? process issues, such as application of adhe sive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave ? solder bath specifications, including temperature and impurities
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 24 of 31 nxp semiconductors sa604a high-performance low-power fm if system 16.4 reflow soldering key characteristics in reflow soldering are: ? lead-free versus snpb solderi ng; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see figure 20 ) than a snpb process, thus reducing the process window ? solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board ? reflow temperature profile; this profile includ es preheat, reflow (in which the board is heated to the peak temperature) and cooling down. it is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). in addition, the peak temperature must be low enough that the packages and/or boards are not damaged. the peak temperature of the package depends on package thickness and volume and is classified in accordance with ta b l e 1 0 and 11 moisture sensitivity precautions, as indicat ed on the packing, must be respected at all times. studies have shown that small packages reach higher temperatures during reflow soldering, see figure 20 . table 10. snpb eutectic process (from j-std-020d) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 ? 350 < 2.5 235 220 ? 2.5 220 220 table 11. lead-free process (from j-std-020d) package thickness (mm) package reflow temperature ( ?c) volume (mm 3 ) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 25 of 31 nxp semiconductors sa604a high-performance low-power fm if system for further information on temperature profiles, refer to application note an10365 ?surface mount reflow soldering description? . msl: moisture sensitivity level fig 20. temperature profiles for large and small components 001aac844 temperature time minimum peak temperature = minimum soldering temperature maximum peak temperature = msl limit, damage level peak temperature
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 26 of 31 nxp semiconductors sa604a high-performance low-power fm if system 17. soldering: pcb footprints fig 21. pcb footprint for sot109-1 (so16); reflow soldering ',0(16,216lqpp $\ %\ ' ' *\ +\ 3 & *[ +[ 627 vroghuodqg rffxslhgduhd )rrwsulqwlqirupdwlrqiruuhiorzvroghulqjri62sdfndjh $\ %\ *\ & +\ +[ *[ 3 *hqhulfirrwsulqwsdwwhuq 5hihuwrwkhsdfndjhrxwolqhgudzlqjirudfwxdood\rxw 3 ' '? 3
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 27 of 31 nxp semiconductors sa604a high-performance low-power fm if system fig 22. pcb footprint for sot1039-2 (hxqfn16); reflow soldering sot1039-2 footprint information for reflow soldering of hxqfn16 package sot1039-2_fr occupied area solder land placement area solder resist, 0.0625 around copper solder land plus solder paste dimensions in mm clearance, 0.125 around occupied area solder paste deposit, -0.02 around copper, stencil thickness 0.1 0.0125 0.0125 0.500 0.240 0.500 1.500 2.000 4.250 3.300 pa + oa 0.240 0.500 0.500 1.500 2.000 3.300 pa + oa 4.250 0.800 0.350 0.800 0.350 1.800 2.300 4.000 1.800 1.500 2.300 4.000 13-03-25 13-04-22
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 28 of 31 nxp semiconductors sa604a high-performance low-power fm if system 18. abbreviations 19. revision history table 12. abbreviations acronym description am amplitude modulation ask amplitude shift keying bpf band-pass filter fm frequency modulation fsk frequency shift keying if intermediate frequency pcb printed-circuit board rf radio frequency rssi received signal strength indicator sca subsidiary communications authorization sinad signal-to-noise-and-distortion ratio table 13. revision history document id release date data sheet status change notice supersedes sa604a v.4.1 20150330 product data sheet - sa604a v.4 modifications: ? ta b l e 2 , sa604ahr: changed orderable part number from ?sa604ahrx? to ?sa604ahrz?; corrected packing method from ?q1/t1? to ?q2/t3?. sa604a v.4 20150220 product data sheet - sa604a v.3 sa604a v.3 20140418 product data sheet - sa604a v.2 sa604a v.2 19971107 product specification ecn 853-1431 18663 sa604a v.1 sa604a v.1 19941215 product specification - -
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 29 of 31 nxp semiconductors sa604a high-performance low-power fm if system 20. legal information 20.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 20.2 definitions draft ? the document is a draft versi on only. the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product data sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 20.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason whatsoever, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, authorized or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these products are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and products using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in the absolute maximum ratings system of iec 60134) will cause permanent damage to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors products are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or construed as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification.
sa604a all information provided in this document is subject to legal disclaimers. ? nxp semiconductors n.v. 2015. all rights rese rved. product data sheet rev. 4.1 ? 30 march 2015 30 of 31 nxp semiconductors sa604a high-performance low-power fm if system export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. non-automotive qualified products ? unless this data sheet expressly states that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. translations ? a non-english (translated) version of a document is for reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 20.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. 21. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors sa604a high-performance low-power fm if system ? nxp semiconductors n.v. 2015. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 30 march 2015 document identifier: sa604a please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 22. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 4.1 ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 4 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 7 functional description . . . . . . . . . . . . . . . . . . . 6 8 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 7 9 thermal characteristics . . . . . . . . . . . . . . . . . . 7 10 static characteristics. . . . . . . . . . . . . . . . . . . . . 7 11 dynamic characteristics . . . . . . . . . . . . . . . . . . 8 12 performance curves . . . . . . . . . . . . . . . . . . . . . 9 13 application information. . . . . . . . . . . . . . . . . . 10 13.1 circuit description . . . . . . . . . . . . . . . . . . . . . . 11 13.2 if amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . 12 13.3 stability considerations . . . . . . . . . . . . . . . . . 14 13.4 quadrature detector . . . . . . . . . . . . . . . . . . . . 15 13.5 frequency discriminator design equations . . . 16 13.6 audio outputs . . . . . . . . . . . . . . . . . . . . . . . . . 17 13.7 rssi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 13.8 additional circuitry . . . . . . . . . . . . . . . . . . . . . 18 14 test information . . . . . . . . . . . . . . . . . . . . . . . . 19 15 package outline . . . . . . . . . . . . . . . . . . . . . . . . 21 16 soldering of smd packages . . . . . . . . . . . . . . 23 16.1 introduction to soldering . . . . . . . . . . . . . . . . . 23 16.2 wave and reflow soldering . . . . . . . . . . . . . . . 23 16.3 wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 23 16.4 reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 24 17 soldering: pcb footprints. . . . . . . . . . . . . . . . 26 18 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 28 19 revision history . . . . . . . . . . . . . . . . . . . . . . . . 28 20 legal information. . . . . . . . . . . . . . . . . . . . . . . 29 20.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 29 20.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 20.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 20.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 30 21 contact information. . . . . . . . . . . . . . . . . . . . . 30 22 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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