Si4734/35-B20

Table 11. AM/SW/LW Receiver Characteristics1 (VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

Long Wave (LW)

153

279

kHz

 

 

 

 

 

 

 

Input Frequency

fRF

Medium Wave (AM)

520

1710

kHz

 

 

Short Wave (SW)

2.3

21.85

MHz

 

 

 

 

 

 

 

Sensitivity2,3,4,5, 6

 

(S+N)/N = 26 dB

25

35

µV EMF

Large Signal Voltage Handling5,7

 

THD < 8%

300

mVRMS

Power Supply Rejection Ratio

 

ΔVDD = 100 mVRMS, 100 Hz

40

dB

Audio Output Voltage2,8

 

 

54

60

67

mVRMS

Audio S/N2,3,4,6,8

 

 

50

56

dB

Audio THD2,4,8

 

 

0.1

0.5

%

Antenna Inductance

 

Long Wave (LW)

2800

µH

 

 

 

 

 

 

Medium Wave (AM)

180

450

 

 

 

 

 

 

 

 

 

 

Powerup Time

 

From powerdown

110

ms

 

 

 

 

 

 

 

Notes:

1.To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.

2.FMOD = 1 kHz, 30% modulation, A-weighted, 2 kHz channel filter.

3.BAF = 300 Hz to 15 kHz, A-weighted.

4.fRF = 1000 kHz, Δf = 10 kHz.

5.Guaranteed by characterization.

6.Analog audio output mode.

7.See “AN388: Evaluation Board Test Procedure” for evaluation method.

8.VIN = 5 mVrms.

9.Stray capacitance on antenna and board must be < 10 pF to achieve full tuning range at higher inductance levels.

Rev. 1.0

15

Page 15
Image 15
Silicon Laboratories SI4734/35-B20 manual Long Wave LW 153 279

SI4734/35-B20 specifications

Silicon Laboratories SI4734/35-B20 is an advanced, highly integrated broadcast radio receiver designed for various consumer applications. Hailed for its compactness and versatility, the SI4734/35-B20 offers extensive features that enable radio reception across multiple frequency bands, including AM, FM, and shortwave. It caters to the needs of manufacturers looking to incorporate reliable radio capabilities into their devices, ensuring quality sound and performance without the cumbersome designs typically associated with traditional radio receivers.

At the heart of the SI4734/35-B20 are performance-optimized technologies. One standout feature is the device's ability to support digital and analog processing simultaneously, utilizing Silicon Labs’ proprietary digital signal processing (DSP) technology. This architecture not only enhances signal clarity but also helps in mitigating noise, enabling users to experience a superior audio quality across varied environments.

Another notable characteristic of the SI4734/35-B20 is its low power consumption, making it ideal for battery-operated devices. The receiver employs sophisticated power management techniques that allow it to operate efficiently, prolonging battery life while maintaining optimal performance. In this context, the “sleep” mode and fast wake-up times contribute to significant energy savings, affirming its suitability for portable applications.

The SI4734/35-B20 is designed with a robust set of features for ease of integration into various systems. The device supports multiple programmable interfaces, including I2C, providing flexibility in communication with microcontrollers and facilitating straightforward integration into existing designs. Because of its programmable architecture, developers can customize the receiver’s capabilities according to the specific needs of their applications.

Additional features include automatic frequency control (AFC) for stability in tuning, allowing seamless transitions while listening to programs. The built-in AGC (automatic gain control) optimizes the receiver's sensitivity to ensure clear reception even in weak signal conditions.

The SI4734/35-B20 also possesses a wide frequency range, accommodating both standard and niche applications. Its compact form factor and surface-mount technology (SMT) footprint further enhance its appeal to developers seeking to maximize board space in their designs.

In conclusion, the Silicon Laboratories SI4734/35-B20 is a significant advancement in radio receiver technology, combining advanced DSP, low power consumption, and ease of integration. These attributes make it a preferred choice for engineers and manufacturers looking to deliver high-quality audio experiences across a range of consumer electronics, from radios to multifunctional smart devices.