SI4713-B30-GMR【PDF 21/42 页】IC TX FM RADIO RPS/RDS 20UQFN

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Si4712/13-B30

Rev. 1.1

including 32, 40, 44.1, and 48 kHz. The digital audio

interface enables low-power operation by eliminating

the need for redundant DACs and ADCs on the audio

baseband processor.

The Si4712/13 includes a low-noise stereo line input

(LIN/RIN) with programmable attenuation. To ensure

optimal audio performance, the Si4712/13 has a

transmit line input property that allows the user to

specify the peak amplitude of the analog input required

to reach maximum deviation level. The deviation levels

of the audio, pilot, and RDS/RBDS signals can be

independently programmed to customize FM transmitter

designs. The Si4712/13 has a programmable low audio

level and high audio level indicators that allows the user

to selectively enable and disable the carrier based on

the presence of audio content. In addition, the device

provides an overmodulation indicator to allow the user

to dynamically set the maximum deviation level. The

Si4712/13 has a programmable audio dynamic range

control that can be used to reduce the dynamic range of

the audio input signal and increase the volume at the

receiver. These features can dramatically improve the

end users listening experience.

The Si4712/13 is reset by applying a logic low on the

RST pin. This causes all register values to be reset to

their default values. The digital input/output interface

supply (V

) provides voltage to the RST, SEN, SDIO,

RCLK, DIN, DFS, and DCLK pins and can be connected

to the audio baseband processor's supply voltage to

save power and remove the need for voltage level

translators. RCLK is not required for register operation.

The Si4712/13 reference clock is programmable,

supporting many RCLK inputs as shown in Table 9.

The S4712/13 are part of a family of broadcast audio

solutions offered in standard, 3 x 3 mm 20-pin QFN

packages. All solutions are layout compatible, allowing

a single PCB to accommodate various feature offerings.

The Si4712/13 includes line inputs to the on-chip

analog-to-digital converters (ADC), a programmable

reference clock input, and a configurable digital audio

interface. The chip supports I

C-compliant 2-wire, 8-bit

SPI, and a 3-wire control interface.

5.2. FM Transmitter

The transmitter (TX) integrates a stereo audio ADC to

convert analog audio signals to high fidelity digital

signals. Alternatively, digital audio signals can be

applied to the Si4712/13 directly to reduce power

consumption by eliminating the need to convert audio

baseband signals to analog and back again to digital.

Digital signal processing is used to perform the stereo

MPX encoding and FM modulation to a low digital IF.

Transmit baseband filters suppress out-of-channel

noise and images from the digital low-IF signal. A

quadrature single-sideband mixer up-converts the

digital IF signal to RF, and internal RF filters suppress

noise and harmonics to support the harmonic emission

requirements of cellular phones, GPS, WLAN, and other

wireless standards.

The TXO output has over 10 dB of output level control,

programmable in approximately 1 dB steps. This large

output range enables a variety of antennas to be used

for transmit, such as a monopole stub antenna or a loop

antenna. The 1 dB step size provides fine adjustment of

the output voltage.

The TXO output requires only one external 120 nH

inductor. The inductor is used to resonate the antenna

and is automatically calibrated within the integrated

circuit to provide the optimum output level and

frequency response for supported transmit frequencies.

Users are responsible for adjusting their systems

radiated power levels to comply with local regulations

on RF transmission (FCC, ETSI, ARIB, etc.).

5.3. Receive Power Scan

The Si4712/13 is the industrys first FM transmitter with

integrated receive functionality to measure received

signal strength. This has been designed to specifically

handle various antenna lengths including integrated

PCB antennas, wire antennas, and loop antennas,

allowing it to share the same antenna as the transmitter.

The receive function reuses the on-chip varactor from

the transmitter to optimize the receive signal power

applied to the front-end amplifier. Auto-calibration of the

varactor occurs with each tune command for consistent

performance across the FM band.

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