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SI4820-A10 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI4820-A10 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 20 page Si4820/24-A10 Rev. 1.0 9 2. Typical Application Schematic Notes: 1. Place C4 close to VDD2 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, follow the guidelines in "AN555: Si483x-B/Si4820/24 Antenna, Schematic, Layout, and Design Guidelines." Silicon Labs will evaluate the schematics 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 Si4820/24 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 tuner chip. 8. Keep the AM ferrite loop antenna at least 5 cm away from MCU, audio AMP, and other circuits which have AM interference. 9. Place the transformer T1 away from any sources of interference and even away from the I/O signals of the Si4820/24. 5 RFGND Optional: AM air loop antenna 2.0 TO 3.6V 2.0 TO 3.6V Optional FM AM BAND SW Y1 32.768KHz C2 22p C3 22p U1 C5 0.47u ANT2 T1 C 0.47u C4 0.1u C1 0.1u R1 100k VR1 100k 12 3 4 S2 R3 143k R4 180k R5 67k R6 110k FMI AOUT AMI AMI VDD VDD TUNE1 |
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