Si4840/44 Broadcast Analog Tuning Digital Display AM/FM/SW Radio Receiver Description The Si4840/44 is the first analog-tuned digital-display (ATDD) CMOS AM/FM/SW radio receiver IC that integrates the complete receiver function from antenna input to audio output. The Si4840/44 implements Silicon Labs' proven low-IF digital architecture, providing an easy and reliable control interface while eliminating all the manual tuned external components used in traditional solutions. The architecture also provides the industry's leading receiver performance, with excellent sensitivity and selectivity in all supported bands. The Si4840/44 uses a simple potentiometer to provide an analog-tuning interface, and outputs the highly-accurate tuned frequency to a companion MCU / display driver via I2C-compatible, 2-wire control interface. The device supports industry-leading features for band selection, Bass/Treble boost, European EN 55020/22 and U.S. FCC compliance, and advanced audio conditioning for all signal environments to remove pops, clicks, and abrasive static. The device also supports interrupts for valid tuned frequencies and stereo/mono signal quality. These features provide a superb and highly reliable user experience. Like other successful audio products from Silicon Labs, the Si4840/44 offers unmatched integration and PCB space savings with minimum external components and small board area on a single side PCB. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability. The receiver has very low power consumption, runs off two AAA batteries, and delivers the performance benefits of high performance digital radio effect with digital display to the legacy analogtuned radio market. Features - Worldwide FM band support (64–109 MHz) - Worldwide AM band support (504–1750 kHz) - SW band support (Si4844 only) (2.3–28.5 MHz) - Selectable support for all AM/FM/SW regional bands - 2-wire control interface - Flexible Mono/Stereo control and programmability - Digital volume control support - Excellent real-world performance - Automatic frequency control (AFC) - EN55020 compliant - Minimal BOM components with no manual alignment - Two AAA batteries with 2.0 to 3.6 V supply voltage - Wide range of ferrite loop sticks and air loop antennas - 24-pin SSOP package - RoHS compliant Applications - Table and portable radios - Stereos - Mini/micro systems - Boomboxes - Clock radios - Modules - Entertainment systems - Toys, lamps, and any application needing an AM/FM radio Si484x Si4830/34 ADC AMI AM ANT RFGND LNA FMI LOUT DAC ROUT DSP ADC FM ANT DAC AGC 0/90 TUNE1/2 ADC BAND AFC AM/FM/SW Receiver RST XTAL OSC IRQ REG SDIO 2.0~3.6V VDD1/2 CONTROL INTERFACE SCLK XTALI Copyright © 2011 by Silicon Laboratories 6.13.2011 Si4840/44 Broadcast Analog Tuning Digital Display AM/FM/SW Radio Receiver Selected FM Electrical Specifications Parameter Symbol Input Frequency Conditions fRF Sensitivity (S+N)/N = 26 dB Input IP3 Min Typ Max Units 64 — 109 MHz — 2.2 — µV EMF — 105 — dBµV EMF Adjacent Channel Selectivity ±200 kHz — 50 — dB Alternate Channel Selectivity ±400 kHz — 65 — dB Audio Output Voltage — 80 — mVRMS Audio S/N — 55 — dB Audio THD — 0.1 0.5 % Units Selected AM Electrical Specifications Parameter Symbol Conditions Min Typ Max fRF AM 504 — 1750 kHz SW 2.3 — 28.5 MHz (S+N)/N = 26 dB — 30 — µV EMF Audio S/N — 55 — dB Audio Output Voltage — 60 — mVRMS — 0.1 0.5 % 180 — 450 μH Input Frequency Sensitivity Audio THD Antenna Inductance Package Information Pin Assignments LNA_EN 1 24 LOUT IRQ 2 23 ROUT TUNE1 3 22 DBYP TUNE2 4 21 VDD2 BAND 5 20 VDD1 NC 6 19 XTALI NC 7 18 XTALO FMI 8 17 SCLK RFGND 9 16 SDIO NC 10 15 RST Max NC 11 14 GND AMI 12 13 GND Table 1. Package Dimensions Dimension Min Nom Max Dimension A — — 1.75 e A1 0.10 — 0.25 L 0.40 — 1.27 b 0.20 — 0.30 θ 0° — 8° c 0.10 — 0.25 D 8.65 BSC Min Nom 0.635 BSC aaa 0.20 bbb 0.18 E 6.00 BSC ccc 0.10 E1 3.90 BSC ddd 0.10 Notes: 1. 2. 3. 4. All dimensions shown are in millimeters (mm) unless otherwise noted. Dimensioning and Tolerancing per ANSI Y14.5M-1994. This drawing conforms to the JEDEC Solid State Outline MO-137, Variation AE. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. AM/FM/SW Receiver Copyright © 2011 by Silicon Laboratories 6.13.2011 Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders Smart. Connected. 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