rev. 0.1 10/11 copyright ? 2016 by silicon laboratories si4820/24-demo si4820/24-demo si4820/24 d emo b oard u ser ? s g uide 1. features ?? atad (analog tune and analog display) am/fm/sw radio ?? worldwide fm band support from 64?109 mhz with 5 sub-bands: ?? fm1 87?108 mhz (demo board default) ?? fm2 86.5?109 mhz ?? fm3 87.3?108.25 mhz ?? fm4 76?90 mhz ?? fm5 64?87 mhz (demo board default) ?? worldwide am band support from 504?1750 khz with 5 sub-bands ?? am1 520?1710 khz (demo board default) ?? am2 522?1620 khz (demo board default) ?? am3 504?1665 khz ?? am4 520?1730 khz ?? am5 510?1750 khz ?? worldwide sw band support from 5.6?22 mhz with 16 sub-bands: ?? sw1 5.6?6.4 mhz (demo board default, for si4824 only) ?? sw2 5.95?6.2 mhz ?? sw3 6.8?7.6 mhz (demo board default, for si4824 only) ?? sw4 7.1?7.6 mhz ?? sw5 9.2?10 mhz (demo board default, for si4824 only) ?? sw6 9.2?9.9 mhz ?? sw7 11.45?12.25 mhz(demo board default, for si4824 only) ?? sw8 11.6?12.2 mhz ?? sw9 13.4?14.2 mhz (demo board default, for si4824 only) ?? sw10 13.57?13.87 mhz ?? sw11 15?15.9 mhz (demo board default, for si4824 only) ?? sw12 15.1?15.8 mhz ?? sw13 17.1?18 mhz (demo board default, for si4824 only) ?? sw14 17.48?17.9 mhz ?? sw15 21.2?22 mhz (demo board default, for si4824 only) ?? sw16 21.45?21.85 mhz ?? twelve positions band switch for selecting different band according to the target market. ?? two aaa battery operations wit h working voltage down to 2.0 v ?? economical potentiometer for frequency tuning re places more expensive variable capacitor (pvc). ?? potentiometer and/or push button volume control ?? fm 50 s or 75 s (default) de-emphasis 2. overview this manual describes the operation of the silicon l abs si4820/24-demo board rev1.0, sep 02, 2011. the silicon laboratories si4820/24-demo board is desi gned with the 24-pin ssop pa ckaged si4820/ 24 chip, the revolutionary single chip am/fm/sw receiver that integr ates everything from antenn a input to audio output and allows use of common and economical potentiometers to do the frequency tuning. it provides a complete portable analog tune analog display am/fm/sw radio design. t he si4820/24-demo is designe d with 1-layer pcb, allowing the lowest cost without sacr ificing the rf performance. the demo board works with two aaa batteries and working voltage down to 2.0 v.
si4820/24-demo 2 rev. 0.1 3. description figure 1 and figure 2 shows the physical layout of the board with key components indicated. figure 1. si4820/24-demo board top side figure 2. si4820/24-demo board bottom side
si4820/24-demo rev. 0.1 3 power: bat1: 2 cells aaa battery holder s1: power on / off audio connectors: j5: mono audio headphone output antenna selections: am antenna: ferrite stick antenna for am j1: bnc connector for fm/ sw conductive testing or fm whip antenna j2: fm antenna selector j6: sma connector for am conductive testing j3: am antenna selector audio output test point: for the general specification test, tp3 is the recommend ed audio signal test point. the audio test instrument should be connected to tp3 to get more accurate test resu lts. j5 can also be used as an audio test point, but the test results may not be entirely accurate under some circumstances. 1-2: hp ant (j5) 2-3: bnc (j1) 3 2 1 1-2: am ferrite antenna 2-3: sma for am conductive test (j6) 3 2 1 2 1gnd aout
si4820/24-demo 4 rev. 0.1 main components: u1: silicon laboratories si482x am/fm/sw atad receiver u2: audio amplifier frequency scale: the analog display for tuning frequency control interface: vr1: frequency tuning wheel. vr2: volume control wheel s3,s4: the push buttons for volume control s2: band switch for fm, am and sw 1: fm1 (87?108 mhz) 2: fm5 (64?87 mhz) 3: am1 (520?1710 khz) 4: am2 (522?1620 khz) 5:sw1 (5.6?6.4 mhz) 6:sw3 (6.8?7.6 mhz) 7:sw5 (9.2?10.0 mhz) 8:sw7 (11.45?12.25 mhz) 9:sw9 (13.4?14.2 mhz) 10:sw11 (15?15.9 mhz) 11:sw13 (17.1?18 mhz) 12:sw15 (21.2? 22 mhz) 3 2 1 45 6 789 11 10 12
si4820/24-demo rev. 0.1 5 4. operation s4820/24-demo board, a complete analog tune and analog display radio, is very easy to operate: 1. put two aaa batteries in to the battery compartment. 2. switch the power switch to the on position. th e board will power up to a ra dio band according to the position of the band switch. 3. change the band switch to the desired band. 4. rotate the tuning wheel and find the desired frequency. 5. rotate the volume control wheel or press the volu me control push buttons to get a comfortable volume. note: for fm listening, the earphone cable must be connected to the board when j2 is set to "hp ant" or an external antenna must be connected to the bnc connector when j2 is set to "bnc". for am listening, the ferrite antenna must be connected to the board and the j3 is set to "ferrite" before turning on the radio or band switching to am. for fm/am sensitivity and snr test, the tu ner output volume level must be set to maximum by pressing push button s4, or you might get degraded test results.
si4820/24-demo 6 rev. 0.1 5. bill of materials ?? atad am/fm/sw receiver ic si 4820/24 with external 32.768 khz crystal oscillator support ?? lm4910 audio amplifier ic ?? see table 1 for details table 1. si4820/24-demo board rev 1.0 bill of materials item qty reference description value 15 c1 c16 c19 c24 c39 cap,sm,0603,x7r 0.1 22 c23 c27 cap,sm,1210,x7r 220 31 c13 cap,sm,1210,x7r 47 42 c14 c25 electrolytic capacitor 100 /4 v 52 c2-3 cap,sm,0603,c0g 22 p 62 c30-31 cap,sm,0603,x7r 33 n 71 c33 cap,sm,0603,c0g 10 p 81 c34 cap,sm,0603,c0g 33 p 93 c4 c12 c15 cap,sm,0603,x7r 4.7 10 2 c5 c36 cap,sm,0603,x7r 0.47 11 2 c8 c10 cap,sm,0603,c0g 100 p 12 1 c11 cap,sm,0603,c0g 330 p 13 1 c18 cap,sm,0603,x7r 820 p 14 1 r25 res,sm,0603 0r 15 1 r22 res,sm,0603 12 k 16 1 r27 res,sm,0603 100r 17 1 r31 res,sm,0603 1k 18 1 r32 res,sm,0603 10r 19 1 r41 res,sm,0603 120 k 20 1 r3 res,sm,0603 2.2 k 21 1 r45 res,sm,0603 200r 22 3 r6 r23 r34 res,sm,0603 100 k 23 1 r20 res,sm,0603 6.8 k 24 2 r37 r38 res,sm,0603 56 k 25 1 r36 res,sm,0603,tolerance 1% 33 k 26 1 r29 res,sm,0603,tolerance 1% 160 k 27 1 r43 res,sm,0603,tolerance 1% 30 k 28 1 r44 res,sm,0603,tolerance 1% 47 k 29 1 r7 res,sm,0603,tolerance 1% 10 k
si4820/24-demo rev. 0.1 7 30 1 r8 res,sm,0603,tolerance 1% 40 k 31 9 r9-12 r14-15 r28 r33 r35 res,sm,0603,tolerance 1% 20 k 32 1 l1 res,sm,0603 0r 33 3 b4 b5 b6 ferrite bead,sm,0603 2.5 k/100 m 34 1 b1 ferrite bead,sm,0603 np 35 1 vr1 100k,10%,variable resistor(pot) 100 k 36 1 vr2 10k,20%,variable resistor(pot) 10 k 37 1 u1 si4820/24,ssop24 si4820/24 38 1 u2 lm4910ma,so8 lm4910ma 39 2 d2 d4 diode,sm,esd,sot23 bav99 40 1 q1 transistor npn sot23 2sc9018 41 1 y1 crystal 32.768 khz 42 1 j1 bnc vertical bnc for fm/ sw testing 43 1 j6 sma vertical sma for am testing 44 2 j2 j3 single pole two throw switch 45 1 j5 earphone jack 46 1 s1 two pole two throw switch 47 1 s2 single pole twelve throw switch 48 1 s3 push button 49 1 s4 push button 50 1 ant1 aw ferrite stick antenna 220 h 51 1 bat1 battery box ,aaa*2 size 52 1 tp3 conn,th,1x2,hdr conn,th,1x2,hdr table 1. si4820/24-demo board rev 1.0 bill of materials (continued) item qty reference description value
si4820/24-demo 8 rev. 0.1 6. schematics fm1 (87mhz - 108mhz) fm5 (64mhz - 87mhz) am1 (520khz - 1710khz) fm/sw mw si482x-b am2 (522khz - 1620khz) sw1 (5.6mhz - 6.4mhz) sw3(6.8mhz - 7.6mhz) sw5(9.2mhz - 10.0mhz) sw7(11.45mhz - 12.25mhz) sw9 (13.4mhz - 14.2mhz) sw11 (15mhz - 15.9mhz) sw13 (17.1mhz - 18mhz) sw15 (21.2mhz - 22mhz) audio output aout gnd r25 0r c39 0.1u ba t1 123 456 s1 12 3 4 5 6 7 8 9 10 11 12 13 s2 r15 20k 1% r10 20k 1% r12 20k 1% r11 20k 1% r14 20k 1% r9 20k 1% r7 10k 1% r8 40k 1% r28 20k 1% r29 160k 1% j1 y1 32.768khz c2 22p c3 22p c19 0.1u c15 4.7u vr1 100k 10% r6 100k d4 ba v99 c5 0.47u q1 2sc9018 r31 1k r32 10r c30 33n c33 10p r41 120k c31 33n b6 2.5k/100m c36 0.47u ant1 mw ferrite antenna j6 d2 ba v99 r34 100k c34 33p 1 lna_en 2 nc 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 vol+ 17 vol- 18 xtal0 19 xtali 20 vdd1 21 vdd2 22 dbyp 23 nc 24 aout u1 s3 volume- s4 volume+ c1 0.1u r27 100r r33 20k 1% r35 20k 1% r36 33k 1% c4 4u7 r37 56k r38 56k c13 47u r43 30k 1% r44 47k 1% c14 100u/4v c16 0.1u r45 200r l1 0r/120nh c12 4u7 vr2-a 1 2 3 j5 c24 0.1u r20 6k8 r22 12k b4 2k5/100m b5 2k5/100m 1 in1 2 in2 3 shutdown 4 gnd 5 vdd 6 vo3 7 vo2 8 vo1 u2 lm4910ma c10 100p c11 330p r3 2k2 c18 820p r23 100k c23 220u c27 220u c8 100p b1 nc tp3 j3 j2 c25 100u/6.3v tp1 vcc vcc vcc vcc vcc vcc vcc ba nd [1] fmi [1] lna_en [1] lna_en [1] ba nd [1] tune1 [1] tune1 [1] vbat vbat reset [1] reset [1] fmi [1] figure 3. si4820/24-demo board rev 1.0 schematic
si4820/24-demo rev. 0.1 9 figure 4. si4820/24-demo board gerber rev 1.0
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