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rev. 0.1 3/13 copyright ? 2016 by silicon laboratories SI4825-DEMO SI4825-DEMO si4825 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 64?109 mhz with 18 bands, see the table 1 ?? worldwide am band support 504?1750 khz with 5 bands, see the table 1 ?? worldwide sw band support 2.3?28.5 mhz with 18 wide bands or 18 narrow bands, see the table 1 ?? 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 de-emphasis ?? sw wide/narrow-band selection via a slide switch table 1. si4825 band sequence definition band name band frequency range de-emphasis (fm) channel space (am) note fm1 87?108 mhz 50 s fm2 87?108 mhz 50 s fm3 87?108 mhz 75 s demo board default fm4 87?108 mhz 75 s fm5 86.5?109 mhz 50 s fm6 86.5?109 mhz 50 s fm7 87.3?108.25 mhz 50 s fm8 87.3?108.25 mhz 50 s fm9 87.3?108.25 mhz 75 s fm10 87.3?108.25 mhz 75 s fm11 76?90 mhz 50 s fm12 76?90 mhz 50 s fm13 64?87 mhz 50 s fm14 64?87 mhz 50 s fm15 76?108 mhz 50 s fm16 76?108 mhz 50 s fm17 64?108 mhz 50 s demo board default fm18 64?108 mhz 50 s am1 520?1710 khz 10k demo board default
SI4825-DEMO 2 rev. 0.1 am2 522-1620 khz 9k demo board default am3 504-1665 khz 9k am4 522-1728 khz / 520-1730 khz 9k / 10k am5 510-1750 khz 10k sw1 sw wide band sw narrow band 2.3?10.0 mhz 2.30?2.49 mhz sw2 3.2?7.6 mhz 3.20?3.40 mhz demo board default sw3 3.2?10.0 mhz 3.90 ? 4.00 mhz demo board default sw4 3.7?12.5 mhz 4.75 ? 5.06 mhz sw5 3.9?7.5 mhz 5.6 ? 6.4 mhz sw6 5.6?22 mhz 5.95 ? 6.2 mhz sw7 5.8?12.1 mhz 6.8 ? 7.6 mhz sw8 5.9?9.50 mhz 7.1 ? 7.6 mhz sw9 5.9?18.0 mhz 9.2 ? 10 mhz demo board default sw10 7.0?16.0 mhz 11.45 ? 12.25 mhz demo board default sw11 7.0?23.0 mhz 11.6 ? 12.2 mhz demo board default sw12 9.0?16.0 mhz 13.4 ? 14.2 mhz sw13 9.0?22.0 mhz 13.57 ? 13.87 mhz demo board default sw14 9.5?18.0 mhz 15 ? 15.9 mhz demo board default sw15 10.0?16.0 mhz 17.1 ? 18 mhz sw16 10.0?22.0 mhz 17.48 ? 17.9 mhz demo board default sw17 13.0?18.0 mhz 21.2 ? 22 mhz sw18 18.0?28.5 mhz 21.45 ? 21.85 mhz table 1. si4825 band sequence definition (continued) band name band frequency range de-emphasis (fm) channel space (am) note
SI4825-DEMO rev. 0.1 3 2. overview this manual describes the operation of the silicon labs SI4825-DEMO bo ard rev1.1, november 20, 2012. the silicon laboratories si48 25-demo board is designed with the 16- pin soic packaged si4825 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. the SI4825-DEMO is designed 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. 3. description figure 1 and figure 2 shows the physical layout of the board with key components indicated. figure 1. SI4825-DEMO board top side figure 2. SI4825-DEMO board bottom side
SI4825-DEMO 4 rev. 0.1 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, tp2 is the recommend ed audio signal test point. the audio test instrument should be connected to tp2 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 (j6) 3 2 1 2 1gnd aout
SI4825-DEMO rev. 0.1 5 tuner output test point: for the tuner specification test, tp1 is the recommended tu ner output test point. the audio test instrument should be connected to tp1 to get accurate test results. main components: u1: silicon laboratories si4825 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 j4: tuner vdd connector (connect tuner pin14 vdd to vbat or vcc) j8: sw wide/narrow-band selector 2 1 gnd aout 1-2: vbat 2-3: vcc 3 2 1 1-2: sw narrow-band 2-3: sw wideband 3 2 1
SI4825-DEMO 6 rev. 0.1 s2: band switch for fm, am and sw 1: fm3 (87?108 mhz) 2: fm17 (64?108 mhz) 3: am1 (520?1710 khz) 4: am2 (522?1620 khz) 5:sw2 (n 3.2?3.4 mhz) (w 3.2?7.6 mhz) 6:sw3 (n 3.9?4.0 mhz) (w 3.2?10.0 mhz) 7:sw9 (n 9.2?10.0 mhz) (w 5.9?18.0 mhz) 8: sw10 (n 11.45?12.25 mhz) (w 7.0?16.0 mhz) 9: sw11 (n 11.6?12.2 mhz) (w 7.0?23.0 mhz) 10: sw13 (n 13.57?13.87 mhz) (w 9.0?22.0 mhz) 11: sw14 (n 15.0?15.9 mhz) (w 9.5?18.0 mhz) 12: sw16 (n 17.48?17.9 mhz) (w 10.0?22.0 mhz) note: n = sw narrow-band, w = sw wideband 3 2 1 45 6 789 11 10 12
SI4825-DEMO rev. 0.1 7 4. operation s4825-demo board, a complete analog tune and analog display radio, is very easy to operate: 1. switch the sw wide/narrow-band selector j8 to the desired sw wideband or narrow-band. 2. switch the tuner vdd connector j4 to the desired vabt or vcc. 3. put two aaa batteries in to the battery compartment. 4. 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. 5. change the band switch to the desired band. 6. rotate the tuning wheel and find the desired frequency. 7. 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.
SI4825-DEMO 8 rev. 0.1 5. bill of materials ?? atad am/fm/sw receiver ic si4825 with ex ternal 32.768 khz cryst al oscillator support ?? lm4910 audio amplifier ic ?? see table 2 for details table 2. SI4825-DEMO board rev1.1 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,x7r 22p 62 c30-31 cap,sm,0603,x7r 33n 71 c33 cap,sm,0603,x7r 10p 81 c34 cap,sm,0603,x7r 33p 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,x7r 100p 12 1 c11 cap,sm,0603,x7r 150p 13 1 c18 cap,sm,0603,x7r 330p 14 1 r25 res,sm,0603 0r 15 1 r22 res,sm,0603 12k 16 1 r27 res,sm,0603 100r 17 1 r31 res,sm,0603 1k 18 1 r32 res,sm,0603 10r 19 1 r17 res,sm,0603 10k 20 1 r41 res,sm,0603 120k 21 1 r3 res,sm,0603 2.2k 22 2 r45 r5 res,sm,0603 200r 23 3 r6 r23 r34 res,sm,0603 100k 24 1 r20 res,sm,0603 6.8k 25 2 r37 r38 res,sm,0603 56k 26 1 r36 res,sm,0603,tolerance 1% 33k 27 1 r29 res,sm,0603,tolerance 1% 140k 28 1 r43 res,sm,0603,tolerance 1% 40k 29 1 r44 res,sm,0603,tolerance 1% 47k
SI4825-DEMO rev. 0.1 9 30 5 r7 r9 r11 r12 r15 res,sm,0603,tolerance 1% 10k 31 1 r8 res,sm,0603,tolerance 1% 50k 32 4 r10 r28 r33 r35 res,sm,0603,tolerance 1% 20k 33 1 r14 res,sm,0603,tolerance 1% 60k 34 1 l1 res,sm,0603 0r 35 3 b4 b5 b6 ferrite bead,sm,0603 2.5k/100m 36 1 b1 ferrite bead,sm,0603 np 37 1 vr1 100k,10%, variable resistor(pot) 100k 38 1 vr2 10k,20%, variable resistor(pot) 10k 39 1 u1 si4825, soic16 si4825 40 1 u2 lm4910ma, so8 lm4910ma 41 1 d1 led led 42 2 d2 d4 diode, sm, esd, sot23 bav99 43 1 q1 transistor npn sot23 2sc9018 44 1 y1 crystal 32.768 khz 45 1 j1 bnc vertical bnc for fm/sw testing 46 1 j6 sma vertical sma for am testing 47 4 j2 j3 j4 j8 single pole two throw switch 48 1 j5 earphone jack 49 1 s1 two pole two throw switch 50 1 s2 single pole twelve throw switch 51 1 s3 s4 push button 52 1 ant1 aw ferrite stick antenna 220 h 53 1 bat1 battery box, aaa*2 size 54 2 tp1 tp2 conn,th,1x2,hdr conn,th,1x2,hdr table 2. SI4825-DEMO board rev1.1 bill of materials (continued) item qty reference description value
SI4825-DEMO 10 rev. 0.1 6. schematics figure 3. SI4825-DEMO board rev 1.1 schematic
SI4825-DEMO rev. 0.1 11 figure 4. SI4825-DEMO board gerber rev 1.1
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