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ATAD (analog tune and analog display) AM/FM/SW radio
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 volume control Push button Bass/Treble control FM 50 µs or 75 µs de-emphasis SW Wideband/Narrow-band selection via a slide switch
Table 1. Si4836 Band Sequence Definition Band Name Band Frequency Range De-emphasis (FM) Channel Space (AM) Note
FM1 FM2 FM3 FM4 FM5 FM6 FM7 FM8 FM9 FM10 FM11 FM12 FM13 FM14 FM15 FM16 FM17 FM18 AM1
Rev. 0.1 3/13
87–108 MHz 87–108 MHz 87–108 MHz 87–108 MHz 86.5–109 MHz 86.5–109 MHz 87.3–108.25 MHz 87.3–108.25 MHz 87.3–108.25 MHz 87.3–108.25 MHz 76–90 MHz 76–90 MHz 64–87 MHz 64–87 MHz 76–108 MHz 76–108 MHz 64–108 MHz 64–108 MHz 520–1710 kHz 50 µs 50 µs 75 µs 75 µs 50 µs 50 µs 50 µs 50 µs 75 µs 75 µs 50 µs 50 µs 50 µs 50 µs 50 µs 50 µs 50 µs 50 µs 10k Demo Board Default Demo Board Default Demo Board Default
Copyright © 2013 by Silicon Laboratories Si4836-DEMO
2 S i 4 8 3 6 - D E M O Band Name Table 1. Si4836 Band Sequence Definition Band Frequency Range De-emphasis (FM) Channel Space (AM) Note
AM2 AM3 AM4 AM5 SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10 SW11 SW12 SW13 SW14 SW15 SW16 SW17 SW18 522–1620 kHz 504–1665 kHz 522–1728 kHz / 520–1730 kHz 510–1750 kHz SW Wide Band SW Narrow Band 2.3–10.0 MHz 2.30–2.49 MHz 3.2–7.6 MHz 3.20–3.40 MHz 3.2–10.0 MHz 3.7–12.5 MHz 3.9–7.5 MHz 5.6–22 MHz 3.90–4.00 MHz 4.75–5.06 MHz 5.6–6.4 MHz 5.95–6.2 MHz 5.8–12.1 MHz 5.9–9.50 MHz 5.9–18.0 MHz 7.0–16.0 MHz 6.8–7.6 MHz 7.1–7.6 MHz 9.2–10 MHz 11.45–12.25 MHz 9.0–16.0 MHz 9.0–22.0 MHz 9.5–18.0 MHz 10.0–16.0 MHz 10.0–22.0 MHz 13.0–18.0 MHz 18.0–28.5 MHz 13.4–14.2 MHz 13.57–13.87 MHz 15–15.9 MHz 17.1–18 MHz 17.48–17.9 MHz 21.2–22 MHz 21.45 –21.85 MHz 9k 9k 9k / 10k 10k Demo Board Default Demo Board Default Demo Board Default Demo Board Default Demo Board Default Demo Board Default Demo Board Default Demo Board Default Demo Board Default
This user’s guide describes the operation of the Silicon Labs Si4836-DEMO board rev1.1, Nov 20, 2012. The Silicon Laboratories Si4836-DEMO board is designed with the 16-pin SOIC packaged Si4836 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 Si4836-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.
Figure 1. Si4836-DEMO Board Top Side Figure 2. Si4836-DEMO Board Bottom Side Rev. 0.1
4 S i 4 8 3 6 - D E M O Power:
BAT1: 2 cells AAA battery holder S1: Power on / off
J5: Stereo audio headphone output
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
Audio Output Test Point:
For the general specification test, TP2 is the recommended audio signal test point. The audio test instrument should be connected to TP2 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.
3 2 1 GND Lout Rout
Si4836-DEMO Tuner Output Test Point:
For the tuner specification test, TP1 is the recommended tuner output test point. The audio test instrument should be connected to TP1 to get accurate test results.
U1: Silicon Laboratories Si4836 AM/FM/SW ATAD receiver U2: Audio amplifier Frequency scale: The analog display for tuning frequency
VR1: Frequency tuning wheel.
VR2: Volume control wheel J9: SMA connector for external RCLK S3: The push button for bass/treble control J8: The bass/treble function enable/disable selector 1 2
3 J7: SW Wideband/Narrow-band selector 1 2 3 1-2: SW Wideband 2-3: SW Narrow-band
6 S i 4 8 3 6 - D E M O
J10: Tuner VDD connector (connect tuner Pin14 VDD to VBAT or VCC) 1 2 3 1-2: VBAT 2-3: VCC S2: Band switch for FM, AM, and SW 1 2 3 4 5 6 7 8 9 10 11 12 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)
N = SW Narrow-band, W = SW Wideband
S4836-DEMO board, a complete analog tune and analog display radio, is very easy to operate: 1. Switch the SW Wideband/Narrow-band selector J7 to the desired SW Wideband or Narrow-band.
2. Switch the tuner VDD connector J10 to the desired VABT or VCC.
3. Switch the bass/treble function enable/disable selector J8 to the desired Disable or Enable.
4. Put two AAA batteries into the battery compartment.
5. Switch the power switch S1 to the ON position. The board will power up to a radio band according to the position of the band switch. 6. Change the band switch S2 to the desired band.
7. Rotate the tuning wheel VR1 and find the desired frequency.
8. Rotate the volume control wheel VR2 to get a comfortable volume.
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.
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ATAD AM/FM/SW receiver IC Si4836 with external 32.768 kHz crystal oscillator support LM4910 Audio amplifier IC
Table 2. Si4836-DEMO Board rev1.1 Bill of Materials Item
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 25 26 27 28 29 17 18 19 20 21 22 23 24
6 3 1 2 2 2 1 1 4 1 2 2 2 2 2 2 4 1 1 1 1 1 1 1 1 2 4 3 2
C1 C6 C16 C19 C24 C39 C23 C26 C27 C13 C14 C25 C2 C3 C30 C31 C33 C34 C4 C7 C12 C21 C15 C5 C36 C8 C10 C11 C20 C18 C22 R25 R26 R17 R22 R27 R31 R32 R41 R3 R18 R5 R16 R21 R45 R6 R23 R34 R19 R20 R1 R2 R4 R13 R46 R36 R29 R43
CAP,SM,0603,X7R CAP,SM,1210,X7R CAP,SM,1210,X7R Electrolytic capacitor CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R CAP,SM,0603,X7R RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603 RES,SM,0603,Tolerance ±1% RES,SM,0603,Tolerance ±1% RES,SM,0603,Tolerance ±1%
0.1 µ 220 µ 47 µ 100 µ/4 V 22p 33n 10p 33p 10u 4.7 µ 0.47 µ 100p 150p 330p 0R 12k 100R 1k 10R 120k 2.2k
200R 100k 6.8k
33k 140k 40k
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
Table 2. Si4836-DEMO Board rev1.1 Bill of Materials (Continued) Qty
1 5 1 4 1 1 1 4 1 1 1 1 1 3 2 1 1 1 2 1 1 2 5 1 1 1 1
R44 R7 R9 R11 R12 R15 R8 R10 R28 R33 R35 RES,SM,0603,Tolerance ±1% RES,SM,0603,Tolerance ±1% RES,SM,0603,Tolerance ±1% RES,SM,0603,Tolerance ±1% R14 RES,SM,0603,Tolerance ±1% L1 RES,SM,0603 L2 B4 B5 B6 B7 Inductor 270nH FERRITE BEAD,SM,0603 B1 VR1 VR2 U1 U2 D1 D3 D5 D2 D4 Q1 FERRITE BEAD,SM,0603 100k,±10%,Variable resistor(POT) 10k,±20%,Variable resistor(POT) SI4836,SOIC16 LM4910MA,SO8 LED DIODE,SM,ESD,SOT23 TRANSISTOR NPN SOT23 J5 S1 S2 S3 Y1 J1 J6 J9 J2 J3 J7 J8 J10 ANT1 BAT1 TP1 TP2 CRYSTAL BNC VERTICAL SMA VERTICAL Single pole two throw switch earphone jack Two pole two throw switch Single pole twelve throw switch Push button AW ferrite stick antenna BATTERY BOX,AAA*2 SIZE CONN,TH,1x3,HDR
47k 10k 50k 20k 60k 0R 270 nH 2.5k/100M NP 100k 10k Si4836 LM4910MA LED BAV99 2SC9018 32.768 kHz BNC For FM/SW testing 220 µH CONN,TH,1x3,HDR
S i 4 8 3 6 - D E M O
10 Rev. 0.1
Si4836-DEMO Figure 4. Si4836-DEMO Board Gerber Rev 1.1
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