Si4820/24-DEMO Si4820/24 D EMO B OA RD 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) 86.5–109 MHz FM3 87.3–108.25 MHz FM4 76–90 MHz FM5 64–87 MHz (Demo Board Default) FM2 Worldwide AM band support from 504–1750 kHz with 5 sub-bands AM1 520–1710 kHz (Demo Board Default) 522–1620 kHz (Demo Board Default) AM3 504–1665 kHz AM4 520–1730 kHz AM5 510–1750 kHz AM2 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 with working voltage down to 2.0 V Economical potentiometer for frequency tuning replaces more expensive variable capacitor (PVC). Potentiometer and/or push button volume control FM 50 µs or 75 µs (default) de-emphasis 2. Overview This manual describes the operation of the Silicon Labs Si4820/24-DEMO board Rev1.0, Sep 02, 2011. The Silicon Laboratories Si4820/24-DEMO board is designed with the 24-pin SSOP packaged Si4820/24 chip, the revolutionary single chip AM/FM/SW receiver that integrates everything from antenna 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 Si4820/24-DEMO is designed with 1-layer PCB, allowing the lowest cost without sacrificing the RF performance. The demo board works with two AAA batteries and working voltage down to 2.0 V. Rev. 0.1 10/11 Copyright © 2016 by Silicon Laboratories Si4820/24-DEMO Si4820/24-DEMO 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 2 Rev. 0.1 Si4820/24-DEMO 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 1 2 3 1-2: HP ANT (J5) 2-3: BNC (J1) J6: SMA connector for AM conductive testing J3: AM antenna selector 1 2 3 1-2: AM Ferrite Antenna 2-3: SMA for AM Conductive Test (J6) Audio Output Test Point: For the general specification test, TP3 is the recommended audio signal test point. The audio test instrument should be connected to TP3 to get more accurate test results. J5 can also be used as an audio test point, but the test results may not be entirely accurate under some circumstances. 1 GND 2 AOUT Rev. 0.1 3 Si4820/24-DEMO 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 2 3 4 5 6 7 8 9 10 11 12 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) 4 Rev. 0.1 Si4820/24-DEMO 4. Operation S4820/24-DEMO board, a complete analog tune and analog display radio, is very easy to operate: 1. Put two AAA batteries into the battery compartment. 2. Switch the power switch to the ON position. The board will power up to a radio 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 volume 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 tuner output volume level must be set to maximum by pressing push button S4, or you might get degraded test results. Rev. 0.1 5 Si4820/24-DEMO 5. Bill of Materials ATAD AM/FM/SW receiver IC Si4820/24 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 1 5 C1 C16 C19 C24 C39 CAP,SM,0603,X7R 0.1 µ 2 2 C23 C27 CAP,SM,1210,X7R 220 µ 3 1 C13 CAP,SM,1210,X7R 47 µ 4 2 C14 C25 Electrolytic capacitor 5 2 C2-3 CAP,SM,0603,C0G 22 p 6 2 C30-31 CAP,SM,0603,X7R 33 n 7 1 C33 CAP,SM,0603,C0G 10 p 8 1 C34 CAP,SM,0603,C0G 33 p 9 3 C4 C12 C15 CAP,SM,0603,X7R 4.7 µ 10 2 C5 C36 CAP,SM,0603,X7R 0.47 µ 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 6 Reference Description Rev. 0.1 Value 100 µ/4 V Si4820/24-DEMO Table 1. Si4820/24-DEMO Board Rev 1.0 Bill of Materials (Continued) Item Qty Reference Description 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 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 38 1 U2 LM4910MA,SO8 39 2 D2 D4 DIODE,SM,ESD,SOT23 40 1 Q1 TRANSISTOR NPN SOT23 41 1 Y1 CRYSTAL 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 51 1 BAT1 BATTERY BOX ,AAA*2 SIZE 52 1 TP3 CONN,TH,1x2,HDR Rev. 0.1 Value 0R Si4820/24 LM4910MA BAV99 2SC9018 32.768 kHz 220 µH CONN,TH,1x2,HDR 7 2.5k/100M B6 LNA_EN [1] R34 100k 33n C30 R41 120k C31 33n R32 10R C33 10p VCC Q1 2SC9018 R31 1k J3 R37 56k VCC D2 BAV99 J6 R38 56k C5 0.47u J2 [1] FMI VCC RESET [1] C19 0.1u L1 0R/120nH 12 S4 D4 BAV99 11 MW J1 100k R6 C34 33p 9 RFGND C36 0.47u S3 C13 47u C1 100R R27 0.1u VR1 100k 10% C2 22p 32.768KHz Y1 0.1u C16 2 4.7u C15 C3 22p NC VCC volume- 6 8 FMI 10 AMI GND 13 NC GND 14 NC RST 15 1 LNA_EN [1] BAND 5 VOL17 VOL+ 16 7 18 NC 4 XTAL0 19 NC XTALI 3 BAND VDD1 20 TUNE2 VDD2 21 TUNE1 DBYP 22 NC 23 AOUT Rev. 0.1 U1 Si482x-B TP1 [1] LNA_EN [1] TUNE1 C4 R45 200R RESET [1] 4u7 VR2-A C39 0.1u VCC 0R R25 5 2 4 1 C14 100u/4V 3 6 4u7 C12 R3 2k2 820p C18 12k R22 4 3 2 1 C25 100u/6.3V 100k R23 LM4910MA GND SHUTDOWN IN2 IN1 U2 C11 R20 0.1u C24 VDD VO3 VO2 VO1 330p 6k8 5 6 7 8 220u C27 100p C10 220u C23 TP3 GND 2k5/100M 100p C8 B4 2k5/100M B5 B1 NC Aout VCC BAT1 VBAT Figure 3. Si4820/24-DEMO Board Rev 1.0 Schematic 24 ANT1 MW ferrite antenna volume+ VBAT VCC 8 S1 FM/SW 1 2 3 [1] FMI Audio output J5 BAND [1] 1 S2 2 3 4 5 6 7 8 9 10 11 12 13 TUNE1 [1] R44 47k 1% R33 20k 1% R29 160k 1% 20k 1% R28 10k 1% R7 40k 1% R8 R9 20k 1% R14 20k 1% R11 20k 1% R12 20k 1% R10 20k 1% R15 20k 1% R35 20k 1% R43 30k 1% R36 33k 1% FM1 (87MHz - 108MHz) FM5 (64MHz - 87MHz) AM1 (520kHz - 1710kHz) 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) Si4820/24-DEMO 6. Schematics Si4820/24-DEMO Figure 4. Si4820/24-DEMO Board Gerber Rev 1.0 Rev. 0.1 9 Smart. Connected. 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