Silicon Laboratories SI4734/35-B20 manual Functional Description, Overview, Si4734/35-B20

Si4734/35-B20

4. Functional Description

4.1. Overview

	FM / SW			Si4734/35
	ANT
	FMI	LNA		RDS	DIGITAL	DOUT
				(Si4735)
					AUDIO	DFS
		AGC		LOW-IF	(Si4735)	GPO/DCLK
AM / LW	AMI		ADC		DAC	ROUT
ANT		LNA		DSP
	RFGND
		AGC	ADC		DAC	LOUT
2.7 - 5.5 V	VDD			CONTROL
	GND	LDO	AFC			VIO
				INTERFACE
						1.5-3.6V
			RCLK	SEN SCLK	SDIO RST

Figure 9. Functional Block Diagram

The Si4734/35 is the industry's first fully integrated, 100% CMOS AM/FM/SW/LW radio receiver IC. 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. The Si4734/35 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.

Leveraging Silicon Laboratories' proven and patented Si4700/01 FM tuner's digital low intermediate frequency (low-IF) receiver architecture, the Si4734/35 delivers superior RF performance and interference rejection in AM, FM, and short wave and long wave bands. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability.

The Si4734/35 is a feature-rich solution including advanced seek algorithms, soft mute, auto-calibrated digital tuning, and FM stereo processing. In addition, the Si4734/35 provides analog or digital audio output and a programmable reference clock. The device supports I2C-compatible 2-wire control interface, SPI, and a

Si4700/01 backwards-compatible 3-wire control interface.

The Si4734/35 utilizes digital processing to achieve high fidelity, optimal performance, and design flexibility. 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 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. Using RDS, the Si4735 enables broadcast data such as station identification and song name to be displayed to the user.

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