SI4705-D-EVB【PDF 22/34 页】BOARD EVAL MOBILE SI4704/05-D50

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Si4704/05-D50

4.13. Embedded Antenna Support

The Si4704/05 is the first FM receiver to support the fast

growing trend to integrate the FM receiver antenna into

the device enclosure. The chip is designed with this

function in mind from the outset, with multiple

international patents pending, thus it is superior to many

other options in price, board space, and performance.

Testing indicates that, when using Silicon Laboratories'

patented techniques, embedded antenna performance

can be very similar in many key metrics to a standard

half-wavelength antenna. Refer to “AN383: Si47XX

Antenna, Schematic, Layout, And Design Guidelines”

4.14. RDS Decoder (Si4705 Only)

The Si4705 implements an RDS processor for symbol

decoding, block synchronization, error detection, and

error correction.

The Si4705 device is user configurable and provides an

optional interrupt when RDS is synchronized, loses

synchronization, and/or the user configurable RDS

FIFO threshold has been met.

The Si4705 reports RDS decoder synchronization

status and detailed bit errors in the information word for

each RDS block with the FM_RDS_STATUS command.

The range of reportable block errors is 0, 1–2, 3–5, or

for additional details on the implementation of support

6+. More than six errors

indicates that the

for an embedded antenna.

Figure 12 shows a conceptual block diagram of the

Si4704/05 architecture used to support the embedded

antenna. The half-wavelength FM receive antenna is

therefore optional. Host software can detect the

presence of an external antenna and switch between

the embedded antenna if desired.

corresponding block information word contains six or

more non-correctable errors or that the block checkword

contains errors.

4.15. Reference Clock

The Si4704/05 reference clock is programmable,

supporting RCLK frequencies in Table 10. Refer to

Table 3, “DC Characteristics” on page 5 for switching

voltage levels and Table 10, “Reference Clock and

Half-wavelength

antenna

FMI

Integrated

antenna

LPI

RFGND

LNA

AGC

Si4704/05

Crystal Characteristics” on page 14 for frequency

tolerance information.

An onboard crystal oscillator is available to generate the

32.768 kHz reference when an external crystal and load

capacitors are provided. Refer to "2. Typical Application

Schematic" on page 15. This mode is enabled using the

POWER_UP command. Refer to Refer to “AN332:

Si47xx Programming Guide”.

The Si4704/05 performance may be affected by data

activity on the SDIO bus when using the integrated

internal oscillator. SDIO activity results from polling the

tuner for status or communicating with other devices

that share the SDIO bus. If there is SDIO bus activity

Figure 12. Conceptual Block Diagram of the

Si4704/05 Embedded Antenna Support

while the Si4704/05 is performing the seek/tune

function, the crystal oscillator may experience jitter,

which may result in mistunes, false stops, and/or lower

SNR.

For best seek/tune

results, Silicon Laboratories

recommends that all SDIO data traffic be suspended

during Si4704/05 seek and tune operations. This is

achieved by keeping the bus quiet for all other devices

on the bus, and delaying tuner polling until the tune or

seek operation is complete. The seek/tune complete

(STC) interrupt should be used instead of polling to

determine when a seek/tune operation is complete.

22

Rev. 1.0

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