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rev.1.0 11/11 copyright ? 2011 by silicon laboratories si4822/26-a10 si4822/26-a10 b roadcast a nalog t uning d igital d isplay am/fm/sw r adio r eceiver features applications description the si4822/26 is the entry level anal og-tuned digital-display digital cmos am/fm/sw radio receiver ic that integrat es the complete receiver function from antenna input to audio output. working with host mcu (i 2 c-compatible 2-wire control interface), frequencies informat ion can be displayed on lcd, while the analog-tune features are kept. lever aging silicon laboratories' proven and patented digital low intermediate frequen cy (low-if) receiver architecture, the si4822/26 delivers superior rf performanc e and interference rejection. the superior control algorithm integrated in si4822/26 provides easy and reliable control interface while eliminating all the manual tuned external components used in traditional solutions. functional block diagram ? worldwide fm band support (64?109 mhz) ? worldwide am band support (504?1750 khz) ? sw band support (si4826 only) (2.3?28.5 mhz) ? selectable support for all am/fm/sw regional bands ? 2-wire control interface ? mono output ? valid station indicator ? digital volume support ? bass/treble support ? minimal bom components with no manual alignment ? excellent real-world performance ? automatic frequency control (afc) ? two aaa batteries with 2.0 to 3.6 v supply voltage (t = 25 c) ? wide range of ferrite loop sticks and air loop antenna support ? 24-pin ssop package ? rohs compliant ? not en55020 compliant * * note: for consumer applications that require en 55020 compliance, use si4840/44. ? table and portable radios ? boom boxes ? clock radios ? modules for consumer electronics ? toys, lamps, and any application needing an am/fm radio si4830/34 adc adc dsp dac aout afc si4822/26 rfgnd lna ami agc reg vdd1/2 2.0~3.6v xtal osc fmi 0/90 am ant fm ant control interface sclk sdio tune1/2 band xtali rst adc irq this product, its features, and/or its architecture is covered by one or more of the following patents, as well as other patents, pending and issued, both foreign and domestic: 7,127,217; 7,272,373; 7,27 2,375; 7,321,324; 7,355,476; 7,42 6,376; 7,471,940; 7,339,503; 7,339,504. ordering information: see page 19. pin assignments si4822/26-a10 (ssop) nc fmi rfgnd ami band tune2 tune1 irq lna_en nc nc nc rst aout nc dbyp vdd2 sclk sdio xtalo xtali vdd1 gnd gnd 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13
si4822/26-a10 2 rev.1.0
si4822/26-a10 rev.1.0 3 t able of c ontents section page 1. electrical specificat ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3. bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4. functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 4.1. overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 4.2. fm receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3. am receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.4. sw receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 4.5. frequency tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.6. band select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 4.7. bass and treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4.8. volume control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.9. high fidelity dac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.10. soft mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4.11. reference clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.12. memorizing status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.13. programming wi th commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5. commands and propertie s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6. pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.1. si4822/26-a10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7. ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8. package outline: si4822/ 26-a10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9. pcb land pattern: si4822/26-a 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10. top markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 10.1. si4822/26-a10 top mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 11. additional reference resour ces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
si4822/26-a10 4 rev.1.0 1. electrical specifications table 1. recommended operating conditions 1,2 parameter symbol test condition min typ max unit supply voltage 3 v dd 2.0 ? 3.6 v power supply powerup rise time v ddrise 10 ? ? s notes: 1. typical values in the data sheet apply at v dd = 3.3 v and 25 c unless otherwise stated. 2. all minimum and maximum specifications in the data s heet apply across the recommended operating conditions for minimum v dd =2.7v. 3. operation at minimum v dd is guaranteed by characterization when v dd voltage is ramped down to 2.0 v. part initialization may become unresponsive below 2.3 v. table 2. dc characteristics (v dd = 2.7 to 3.6 v, ta = 0 to 70 c) parameter symbol test condition min typ max unit fm mode supply current 1 i fm ?21.0? ma supply current 2 i fm low snr level ? 21.5 ? ma am/sw mode supply current 1 i am ?17.0? ma supplies and interface v dd powerdown current i ddpd ?10? a notes: 1. specifications are guaran teed by characterization. 2. lna is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
si4822/26-a10 rev.1.0 5 figure 1. reset timing table 3. reset timing characteristics (v dd = 2.7 to 3.6 v, ta = 0 to 70 c) parameter symbol min typ max unit rst pulse width t srst 100 ? ? s 30% t srst rst 70%
si4822/26-a10 6 rev.1.0 table 4. 2-wire control interface characteristics 1,2,3 (v dd = 2.7 to 3.6 v, t a = 0 to 70 c) parameter symbol test condition min typ max unit sclk frequency f sclk 0?400khz sclk low time t low 1.3 ? ? s sclk high time t high 0.6 ? ? s sclk input to sdio ? setup (start) t su:sta 0.6 ? ? s sclk input to sdio ? hold (start) t hd:sta 0.6 ? ? s sdio input to sclk ? setup t su:dat 100 ? ? ns sdio input to sclk ? hold 4,5 t hd:dat 0?900ns sclk input to sdio ? setup (stop) t su:sto 0.6 ? ? s stop to start time t buf 1.3 ? ? s sdio output fall time t f:out ?250ns sdio input, sclk rise/fall time t f:in t r:in ?300ns sclk, sdio capacitive loading c b ??50pf input filter pu lse suppression t sp ? ? 50 ns notes: 1. when v d = 0 v, sclk and sdio are low impedance. 2. when selecting 2-wire mode, the user must ensure that a 2- wire start condition (falling edge of sdio while sclk is high) does not occur within 300 ns before the rising edge of rst . 3. when selecting 2-wire mode, the user must ensure th at sclk is high during the rising edge of rst , and stays high until after the first start condition. 4. the si4822/26 delays sdio by a minimum of 300 ns from the v ih threshold of sclk to comply with the minimum t hd:dat specification. 5. the maximum t hd:dat has only to be met when f sclk = 400 khz. at frequencies below 400 khz, t hd:dat may be violated as long as all other timing parameters are met. 20 0.1 c b 1pf ---------- - + 20 0.1 c b 1pf ---------- - +
si4822/26-a10 rev.1.0 7 figure 2. 2-wire control interface read and write timing parameters figure 3. 2-wire control interface read and write timing diagram sclk 70% 30% sdio 70% 30% start start stop t f:in t r:in t low t high t hd:sta t su:sta t su:sto t sp t buf t su:dat t r:in t hd:dat t f:in, t f:out sclk sdio start stop address + r/w ack data ack data ack a6-a0, r/w d7-d0 d7-d0
si4822/26-a10 8 rev.1.0 table 5. fm receiver characteristics 1,2 (v dd = 2.7 to 3.6 v, ta = 0 to 70 c) parameter symbol test condition min typ max unit input frequency f rf 64 ? 109 mhz sensitivity with headphone network 3 (s+n)/n = 26 db ? 4.0 ? v emf lna input resistance 4,5 ?4? k ? lna input capacitance 4,5 ?5? pf am suppression 4,5,6,7 m = 0.3 ? 50 ? db input ip3 4,8 ? 105 ? dbv emf adjacent channel selectivity 4 200 khz ? 45 ? db alternate channel selectivity 4 400 khz ? 60 ? db audio output voltage 5,6,7,12 ?72?mv rms audio mono s/n 5,6,7,9,10 ?45? db audio frequency response low 4 ?3 db ? ? 30 hz audio frequency response high 4 ?3 db 15 ? ? khz audio thd 5,6,11 ?0.10.5 % audio output load resistance 4,10 r l single-ended 10 ? ? k ? audio output load capacitance 4,10 c l single-ended ? ? 50 pf powerup/band switch time 4 ??110 ms notes: 1. additional testing information is available in ?a n603: si4822/26/40/44 demo board test procedure.? volume = maximum for all tests. tested at rf = 98.1 mhz. 2. to ensure proper operation and receiver performance, follo w the guidelines in ?an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines.? silicon l aboratories will evaluate schematics and layouts for qualified customers. 3. frequency is 64~109 mhz. 4. guaranteed by characterization. 5. v emf =1 mv. 6. f mod = 1 khz, mono, and l = r unless noted otherwise. 7. ? f = 22.5 khz. 8. |f 2 ? f 1 | > 2 mhz, f 0 =2xf 1 ? f 2 . 9. b af = 300 hz to 15 khz, a-weighted. 10. at a out pin. 11. ? f = 75 khz. 12. tested in digital volume mode.
si4822/26-a10 rev.1.0 9 table 6. am/sw receiver characteristics 1, 2 (v dd = 2.7 to 3.6 v, ta = 0 to 70 c) parameter symbol test condition min typ max unit input frequency f rf medium wave (am) 504 ? 1750 khz short wave (sw) 2.3 ? 28.5 mhz sensitivity 3,4,5 (s+n)/n = 26 db ? 30 ? v emf large signal voltage handling 5 thd < 8% ? 300 ? mv rms power supply rejection ratio 5 ? v dd =100 mv rms , 100 hz ? 40 ? db audio output voltage 3,6,8 ? 54 ? mv rms audio s/n 3,4,6 ? 45 ? db audio thd 3,6 ? 0.1 ? % antenna inductance 5,7 180 ? 450 h powerup/band switch time 5 from powerdown ? ? 110 ms notes: 1. additional testing information is available in ?an 603: si4822/26/40/44 demo board test procedure.? volume = maximum for all tests. tested at rf = 520 khz. 2. to ensure proper operation and receiver performance, follow the guidelines in ?an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines.? silicon laborato ries will evaluate schematics and layouts for qualified customers. 3. fmod = 1 khz, 30% modulation, 2 khz channel filter. 4. b af = 300 hz to 15 khz, a-weighted. 5. guaranteed by characterization. 6. v in =5mvrms. 7. stray capacitance on antenna and board must be < 10 pf to achieve full tuning range at higher inductance levels. 8. tested in digital volume mode. table 7. reference clock and crystal characteristics (v dd = 2.7 to 3.6 v, t a = 0 to 70 c) parameter symbol test condition min typ max unit reference clock xtali supported reference clock frequencies ? 32.768 ? khz reference clock frequency tolerance for xtali ?100 ? 100 ppm crystal oscillator crystal oscillator frequency ? 32.768 ? khz crystal frequency tolerance ?100 ? 100 ppm board capacitance ??3.5pf
si4822/26-a10 10 rev.1.0 table 8. thermal conditions parameter symbol min typ max unit thermal resistance* ? ja ?80?c/w ambient temperature t a 02570c junction temperature t j ??77c *note: thermal resistance assumes a multi-layer pcb with the exposed pad soldered to a topside pcb pad. table 9. absolute maximum ratings 1,2 parameter symbol value unit supply voltage v dd ?0.5 to 5.8 v input current 3 i in 10 ma operating temperature t op ?40 to 95 c storage temperature t stg ?55 to 150 c rf input level 4 0.4 v pk notes: 1. permanent device damage may occur if the above absolu te maximum ratings are exceeded. functional operation should be restricted to the conditions as specified in the operational sections of this data sheet. exposure beyond recommended operating conditions for extended periods may affect device reliability. 2. the si4822/26-a10 devices are high-perform ance rf integrated circuits with certain pins having an esd rating of < 2 kv hbm. handling and assembly of these devices should only be done at esd-protected workstations. 3. for input pins rst, sdio, sclk, xtalo, xtal i, band, tune2, tune1, irq, and lna_en. 4. at rf input pins, fmi, and ami.
si4822/26-a10 rev.1.0 11 2. typical application schematic notes: 1. place c 4 close to v dd2 and dbyp pins. 2. all grounds connect directly to gnd plane on pcb. 3. pin 6, pin 7, and pin 23 leave floating. 4. to ensure proper operation and receiver performance, follo w the guidelines in ?an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines.? silicon l abs will evaluate the schemati cs and layouts for qualified customers. 5. pin 8 connects to the fm antenna interface and pin 12 connects to the am antenna interface. 6. place si4822/26 as close as possible to antenna jack and keep the fmi and ami traces as short as possible. 7. recommend keeping the am ferrite loop antenna at least 5 cm away from the si4822/26. 8. keep the am ferrite loop antenna at least 5 cm away from mcu, audio amplifier, and ot her circuits which have am interference. 9. place the transformer t1 away from any sources of interf erence and even away from the i/o signals of the si4822/26. 5 rfgnd optional: am air loop antenna 2.0 to 3.6v 2.0 to 3.6v optional (si4826 only) 2.5k/100m fm am ba nd optional to host mcu to host mcu y1 32.768khz c2 22p c3 22p 1 lna_en 2 irq 3 tune1 4 tune2 5 ba nd 6 nc 7 nc 8 fmi 9 rfgnd 10 nc 11 nc 12 ami 13 gnd 14 gnd 15 rst 16 sdio 17 sclk 18 xtalo 19 xtali 20 vdd1 21 vdd2 22 dbyp 23 nc 24 aout u1 c5 0.47u ant1 am antenna ant2 t1 c 0.47u c4 0.1u c1 0.1u vr1 100k b1 12 3 s1 r2 253k r3 180k r4 67k irq lna_en fmi aout ami ami vdd vdd ba nd tune1 tune1 sclk sdio reset
si4822/26-a10 12 rev.1.0 3. bill of materials table 10. si4822/26-a10 bill of materials component(s) value/description supplier c1 reset capacitor 0.1 f, 20%, z5u/x7r murata c4 supply bypass capacitor, 0.1 f, 20%, z5u/x7r murata c5 coupling capacitor, 0.47 f, 20%, z5u/x7r murata b1 ferrite bead 2.5 k/100 mhz murata vr1 variable resistor (pot), 100 k, 10% kennon u1 si4822/26 am/fm/sw analog tune digital display radio tuner silicon laboratories ant1 ferrite stick,180?450 h jiaxin optional components c2, c3 crystal load capacitors, 22 pf, 5%, cog (optional: for crystal oscillator option) venkel y1 32.768 khz crystal (optional: for crys tal oscillator option) epson or equivalent ant2 air loop antenna, 10?20 hvarious s1 band switch any, depends on customer r2 resistor, 253 k, 1%, venkel r3 resistor, 180 k, 1% venkel r4 resistor, 67 k, 1% venkel
si4822/26-a10 rev.1.0 13 4. functional description figure 4. si4822/26-a10 functional block diagram 4.1. overview the si4822/26-a10 is the entry level analog-tuned digital-display digital cmos am/fm/sw radio receiver ic that integrates the complete receiver function from antenna input to audio output. working with an external mcu with lcd/led driver, si4822/26 can output the am/fm/sw frequencies and band and volume information to display on lcd/led, while using a simple potentiometer at the front end for analog-tune. leveraging silicon laborator ies' proven and patented digital low intermediate frequency (low-if) receiver architecture, the si4822/26 delivers superior rf performance and interference rejection in am, fm and sw bands. additionally, the digital core provides advanced audio conditioning for all environments, removing pops, clicks, and loud static in variable signal conditions. the superior control algorithm integrated in si4822/26 provides easy and reliable control interface while eliminating all the manual tuned external components used in traditional solutions. like other successful audio products from silicon labs, si4822/26 offers unmatched integration and pcb space savings with minimum external components and a small board area on a single side pcb. the high integration and complete system production test simplifies design- in, increases system quality, and improves manufacturability. the rece iver has very low power consumption, runs off two aaa batt eries, and delivers the performance benefits of high performance digital radio experience with digital display to the legacy analog-tuned radio market. the si4822/26 prov ides good flexibility in using the chip. the frequency range of fm/am/sw bands, de- emphasis value, am tuning step, and am soft mute level/rate can be either configured by the mcu or by using external hardware to make a selection. the reference clock of the fm tuner can be provided by either the crystal or by the host mcu within tolerance. the si4822/26 also has flexibility in selecting bands and configuring band properties, enabling masked host mcu for multiple projects, and reducing the cost of development. four tuning preferences are available to meet different tuning preference requirements. si4830/34 adc adc dsp dac aout afc si4822/26 rfgnd lna ami agc reg vdd1/2 2.0~3.6v xtal osc fmi 0/90 am ant fm ant control interface sclk sdio tune1/2 band xtali rst adc irq
si4822/26-a10 14 rev.1.0 4.2. fm receiver the si4822/26-a10 integrates a low noise amplifier (lna) supporting the worldwide fm broadcast band (64 to 109 mhz). pre-emphasis and de-emphasis is a technique used by fm broadcasters to improve the signal-to-noise ratio of fm receivers by reducing the effects of high frequency interference and noise. when the fm signal is transmitted, a pre-emphasis filter is applied to accentuate the high audio frequencies. all fm receivers incorporate a de-emphasis f ilter which attenuates high frequencies to restore a flat frequency response. two time constants are used in various regions. the de - emphasis time constant can be chosen to be 50 or 75 s. refer to "an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines." 4.3. am receiver the highly integrated si4822/26-a10 supports worldwide am band reception from 504 to 1750 khz with five sub-bands using a digital low-if architecture with a minimum number of external components and no manual alignment required. this patented architecture allows for high-precision f iltering, offering excellent selectivity and snr with minimum variation across the am band. similar to the fm receiver, the si4822/26-a10 optimizes sensitivity and reje ction of strong interferers, allowing better reception of weak stations. to offer maximum flexibility, the receiver supports a wide range of ferrite loop sticks from 180?450 h. an air loop antenna is supported by using a transformer to increase the effective inductance from the air loop. using a 1:5 turn ratio inductor, the inductance is increased by 25 times and easily supports all typical am air loop antennas, which generally vary between 10 and 20 h. a 9, 10 khz tuning step can be chosen by the external resistor or host mcu according to the different regions, and am soft mute level can be programmed by the host mcu to have different tuning experiences. refer to ?an610: si4822/26/40/44 programming guide? and "an602: si4822/26/40/44 ant enna, schematic, layout, and design guidelines" for more details. 4.4. sw receiver the si4826 supports short wave band receptions from 2.3 to 28.5 mhz in 5 khz step size increments. si4826 supports extensive short wave features such as minimal discrete components and no factory adjustments. the si4826 supports using the fm antenna to capture short wave signals. refer to ?an610: si4822/26/40/44 programming guide? and "an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines" for more details. 4.5. frequency tuning a valid channel can be found by tuning the potentiometer that is connected to the tune1 and tune2 pin of the si4822/26-a10 chip. to offer easy tuning, the si4822/26-a10 also outputs the tuned information to the mcu with lcd/led driver to display. it will light up the ic on on display if the rf signal quality passes a certain threshold when tuned to a valid station. refer to "an610: si4822/26/40/44 programming guide" for more details. 4.6. band select the si4822/26-a10 supports worldwide am band with five sub-bands, us/europe/japan/china fm band with five sub-bands, and sw band with 16 sub-bands. si4822/26-a10 provides the flexibility to configure the band and band properties at either the mcu side or the tuner side, enabling masked mcu for multiple projects. for details on band selection, refer to "an602: si4822/26/40/44 antenna , schematic, layout, and design guidelines" and "an610: si4822/26/40/44 programming guide".
si4822/26-a10 rev.1.0 15 4.7. bass and treble the si4822/26-a10 further supports bass/treble tone control for superior sound quality. the si4822/26-a10 can be set to be default normal, or programmed by the host mcu i 2 c-compatible 2-wire mode. fm has nine levels bass/treble effect and am/sw has seven levels bass/treble effect.for further configuration details, refer to "an610: si4822/26/40/44 programming guide". 4.8. volume control the si4822/26-a10 not only allows users to use the traditional pvr wheel vo lume control through an external speaker amplifier, it also supports digital volume control programmed by the host mcu. si4822/26-a10 can be programmed to be bass/treble mode only or digital volume mode only; it can also be programmed to have the digital volume coexist with bass/treble in two modes. refer to "an610: si4822/26/40/44 programming guide" and "an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines" for more details. 4.9. high fidelity dac high-fidelity digital-to-a nalog converters (dacs) drive analog audio signals onto the aout pin. the audio output may be muted. 4.10. soft mute the soft mute feature is available to attenuate the audio outputs and minimize audible noise in very weak signal conditions. advanced algorithm is implemented to get a better analog tuning experience. the soft mute feature is triggered by the snr me tric. the snr threshold for activating soft mute is programmable, as are soft mute attenuation levels and attack and decay rates. 4.11. reference clock the si4822/26-a10 supports rclk input (to xtali pin) with the spec listed in table 7. it can be shared with the host mcu to save extra crystal. an onboard crystal oscillator is available to generate the 32.768 khz reference when an external crystal and load capacitors are provided. refer to "an602: si4822/26/40/44 antenna, schematic, layout, and design guidelines" for more details. 4.12. memorizing status the si4822/26-a10 provides the feature to memorize status from the last power down with a simple design on pcb, including frequency of the fm/am/sw station. refer to "an602: si4822/26/ 40/44 antenna, schematic, layout, and design guidelines" for details. 4.13. programmi ng with commands to ease development time and offer maximum customization, the si4822/2 6 provides a simple yet powerful software interface to program the receiver. the device is programmed using commands, arguments, properties, and responses. to perform an action, the user writes a command byte and associated arguments, causing the chip to execute the given command. commands control an action such as powerup the device, shut down the device, or get the current tuned frequency. arguments are specific to a given command and are used to modify the command. properties are a special command argument used to modify the default chip operation and are generally configured immediately after powerup. examples of properties are de-emphasis level and soft mute attenuation threshold. responses provide the user information and are echoed after a command and associated arguments are issued. all commands provi de a 1-byte status update, indicating interrupt and clear-to-send status information. for a detailed description of the commands and properties for the si4822/26, see "an610: si4822/26/40/44 programming guide".
si4822/26-a10 16 rev.1.0 5. commands and properties table 11. si4822/26-a10 fm receiver command summary cmd name description 0xe0 atdd_get_status get tune freq, band and etc status of the device 0xe1 atdd_power_up power up device, ban d selection and band properties setup 0xe2 atdd_audio_mode audio output mode: get/set audio mode and settings 0x10 get_rev returns the revision information of the device. 0x11 power_down power down device. 0x12 set_property sets the value of a property. 0x13 get_property retrieve a property's value. note: the si4822/26 has its own power up and get status commands wh ich is different from previous si47xx tuner parts. to differentiate, we use ?atdd_power_up? and atdd_get_ status to denote the atdd specific commands instead of the general si47xx ?power_up? and ?status? commands table 12. si4822/26-a10 fm receiver property summary prop name description default 0x1100 fm_deemphasis sets deemphasis time constant. default is 75 s. 0x0002 0x1300 fm_soft_mute_rate sets the attack and decay rates when entering and leaving soft mute. 0x0040 0x1301 fm_soft_mute_slope configures attenuat ion slope during soft mute in db attenua- tion per db snr below the soft mute snr threshold. default value is 2. 0x0002 0x1302 fm_soft_mute_ max_attenuation sets maximum attenuation during soft mute (db). set to 0 to disable soft mute. default is 16 db. 0x0010 0x1303 fm_soft_mute_ snr_threshold sets snr threshold to engage soft mute. default is 4 db. 0x0004 0x4000 rx_volume sets the output volume. 0x003f 0x4001 rx_hard_mute mutes the audio output. 0x0000 0x4002 rx_bass_treble sets the ou tput bass/treble level 0x0004 0x4003 rx_actual_volume read th e actual output volume 0x003f
si4822/26-a10 rev.1.0 17 table 13. si4822/26-a10 am/sw receiver command summary cmd name description 0xe0 atdd_get_status get tune freq, band and etc status of the device 0xe1 atdd_power_up power up device, ban d selection and band properties setup 0xe2 atdd_audio_mode audio output mo de: get/set audio mode settings. 0x10 get_rev returns the revision information of the device. 0x11 power_down power down device. 0x12 set_property sets the value of a property. 0x13 get_property retrieve a property's value. note: the si4822/26 has its own power up and get status commands wh ich is different from previous si47xx tuner parts. to differentiate, we use ?atdd_power_up? and atdd_get_ status to denote the atdd specific commands instead of the general si47xx ?power_up? and ?status? commands. table 14. si4822/26-a10 am/sw receiver property summary prop name description default 0x4000 rx_volume sets the output volume. 0x003f 0x4001 rx_hard_mute mutes the audio output. 0x0000 0x4002 rx_bass_treble sets the outp ut bass/treble level 0x0003 0x4003 rx_actual_volume read the actual output volume 0x003f 0x3300 am_soft_mute_rate sets the attack and decay rates when entering and leaving soft mute. 0x0040 0x3301 am_soft_mute_slope configures attenuatio n slope during soft mute in db attenu- ation per db snr below the soft mute snr threshold. 0x0002 0x3302 am_soft_mute_ max_attenuation sets maximum attenuation during soft mute (db). set to 0 to disable soft mute. 0x0010 0x3303 am_soft_mute_ snr_threshold sets snr threshold to engage soft mute. 0x0008
si4822/26-a10 18 rev.1.0 6. pin descriptions 6.1. si4822/26-a10 pin number(s) name description 1 lna_en enabling sw external lna for si4826 2 irq interrupt request 3 tune1 frequency tuning 4 tune2 frequency tuning 5 band band selection and de-emphasis selection 6,7 nc no connect. leave floating . 8 fmi fm rf inputs. fmi should be connected to the antenna trace. 9 rfgnd rf ground. connect to ground plane on pcb. 10, 11 nc unused. tie these pins to gnd. 12 ami am rf input. ami should be connected to the am antenna. 13, 14 gnd ground. connect to ground plane on pcb. 15 /rst device reset (active low) input 16 sdio serial data input/output 17 sclk serial clock input 18 xtalo crystal oscillator output 19 xtali crystal oscillator input 20 vdd1 supply voltage. may be connected directly to battery. 21 vdd2 supply voltage. may be connected directly to battery. 22 dbyp dedicated bypass for vdd 23 nc no connect. leave floating. 24 aout audio output nc fmi rfgnd ami band tune2 tune1 irq lna_en nc nc nc rst aout nc dbyp vdd2 sclk sdio xtalo xtali vdd1 gnd gnd 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13
si4822/26-a10 rev.1.0 19 7. ordering guide part number 1,2 description package type operating temperature/voltage SI4822-A10-cu am/fm broadcast analog tune digital display radio receiver 24l ssop pb-free 0 to 70 c 2.0 to 3.6 v si4826-a10-cu am/fm/sw broadcast analog tune digital display radio receiver 24l ssop pb-free 0 to 70 c 2.0 to 3.6 v notes: 1. add an ?(r)? at the end of the device part number to denote tape and reel option. the devices will typically operate at 25 c with degraded specifications for v dd voltage ramped down to 2.0 v. 2. the -c suffix in the part number indicates consumer gr ade product. visit www.silabs.com to get more information on product grade s pecifications.
si4822/26-a10 20 rev.1.0 8. package outl ine: si4822/26-a10 the 24-pin ssop illustrates the package details for the si4822/26- a10. table 15 lists the values for the dimensions shown in the illustration. figure 5. 24-pin ssop table 15. package dimensions dimension min nom max a??1.75 a1 0.10 ? 0.25 b0.20?0.30 c0.10?0.25 d 8.65 bsc e 6.00 bsc e1 3.90 bsc e 0.635 bsc l0.40?1.27 0 ? 8 aaa 0.20 bbb 0.18 ccc 0.10 ddd 0.10 notes: 1. all dimensions shown are in millimeters (mm) unless otherwise noted. 2. dimensioning and tolerancing per ansi y14.5m-1994. 3. this drawing conforms to the jedec so lid state outline mo-137, variation ae. 4. recommended card reflow profile is per the jedec/ipc j-std-020 specification for small body components. ?
si4822/26-a10 rev.1.0 21 9. pcb land pa ttern: si4822/26-a10 figure 6 illustrates the pcb land pattern details for the si4822/26-a10-cu ssop . table 16 lists the values for the dimensions shown in the illustration. figure 6. pcb land pattern table 16. pcb land pattern dimensions dimension min max c5.205.40 e 0.635 bsc x1 0.35 0.45 y1 1.55 1.75 general: 1. all dimensions shown are in millimeters (mm) unless otherwise noted. 2. this land pattern design is based on the ipc-7351 guidelines. solder mask design: 3. all metal pads are to be non-solder mask defined (nsmd). clearance between the solder mask and the metal pad is to be 60 m minimum, all the way around the pad. stencil design: 4. a stainless steel, laser-cut, and electr o-polished stencil with trapezoidal walls should be used to assure good solder paste release. 5. the stencil thickness should be 0.125 mm (5 mils). 6. the ratio of stencil aperture to land pad size should be 1:1 for all perimeter pads. card assembly: 7. a no-clean, type-3 solder paste is recommended. 8. the recommended card reflow profile is per the jedec/ipc j-std-020 specification for small body components.
si4822/26-a10 22 rev.1.0 10. top markings 10.1. si4822/26-a10 top marking 10.2. top marking explanation mark method: yag laser line 1 marking: device identifier 4822a10cu = SI4822-A10 4826a10cu = si4826-a10 line 2 marking: yy = year ww = work week tttttt = manufacturing code assigned by the assembly house. 4822a10cu yywwtttttt 4826a10cu yywwtttttt
si4822/26-a10 rev.1.0 23 11. additional reference resources contact your local sales representative s for more information or to obtain copies of the following references: ? an602: si4822/26/40/44 antenna, sche matic, layout, and design guidelines ? an603: si4822/26/40/44-demo board test procedure ? si4822/26-demo board user?s guide ? an610: si4822/26/40/44 programming guide
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