![]() The Si4732-A10 digital CMOS AM/FM/SW/LW/RDS radio receiver IC integrates the complete broadcast tuner and receiver function from antenna input to digital audio output. Wide range of ferrite loop sticks and air loop antennas supported.Optional digital audio out (Si4735 only).Worldwide AM band support(520–1710 kHz).Using RDS, the Si4735 enables broadcast data such as station identification and song name to be displayed to the user. The Si4735 incorporates a digital processor for the European Radio Data System (RDS) and the North American Radio Broadcast Data System (RBDS), including all required symbol decoding, block synchronization, error detection, and error correction functions. The chip provides excellent pilot rejection, selectivity, and unmatched audio performance, and offers both the manufacturer and the end-user extensive programmability and flexibility in the listening experience. The Si4735 utilizes digital processing to achieve high fidelity, optimal performance, and design flexibility. The device supports I2Ccompatible 2-wire control interface, SPI, and a Si4700/01 backwards-compatible 3-wire control interface. In addition, the Si4735 provides analog or digital audio output and a programmable reference clock. The Si47335 is a feature-rich solution including advanced seek algorithms, soft mute, auto-calibrated digital tuning, and FM stereo processing. Si4735 Block Diagram Si4735 Pinout Datasheet The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability. Leveraging Silicon Laboratories’ proven and patented Si4700/01 FM tuner’s digital low intermediate frequency (low-IF) receiver architecture, the Si4735 delivers superior RF performance and interference rejection in AM, FM, and short wave and long wave bands. The Si4735 AM/FM/SW/LW radio provides the space savings and low-power consumption necessary for portable devices while delivering the high performance and design simplicity desired for all AM/FM/SW/LW solutions. Offering unmatched integration and PCB space savings, the Si4734/35 requires minimal external components and less than 20 mm2 of board area, excluding the antenna inputs. Single turn potentiometers would not work here.The Si4735 is the industry’s first fully integrated, 100% CMOS AM/FM/SW/LW radio receiver IC. POT 12 can be used for tuning and it should be a multi turn type.CF1 and CF2 are SFD455 ceramic filters. ![]() If you are using a battery eliminator for powering the circuit, then it must be well regulated and filtered.A 9V PP3 battery is the best option as it reduces noise and improves performance. The circuit must be assembled on a good quality PCB.Potentiometer R10 can be used for controlling the volume. Capacitor C18 couples the audio output of the TDA1572 to the TDA7052. TDA7052 is an integrated bridge amplifier that can deliver 1W output power into an 8 ohm loudspeaker. TDA7052 forms a 1W audio amplifier stage for driving the loudspeaker. Capacitor C16 and C12 bypasses noise (if any) from the power supply line. Capacitor C3 is the bypass capacitor for the audio frequency preamplifier circuit inside the IC. Preset resistors R5and R9 can be used for setting the meter. Transistor Q2 and associated components form the driver circuit for the field strength meter M1. In simple words, the IF output from the double balanced mixer available at pin is filtered and applied to the input of the gain controlled IF amplifier Filter capacitors C16 and C17 are used for reducing AGC settling time. The band pass filter circuit made around CF1 and CF2 selects the 6KHz band around the intermediate frequency. The intermediate frequency of this circuit is set around 455 KHz. The output available at this pin will be a function of the available field strength and has a good linearity for logarithmic input signals. Pin 11 is the output if the internal field strength indicator circuit. C4 is associated with the internal balanced full wave detector circuit. Potentiometer R12 is used to vary the voltage across the varicap diode D2 for tuning. Inductor L1 connected between pins 14 and 13 of the IC sets the oscillator frequency.
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