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Si4730/31-D50
4.3. FM Receiver
The Si4730/31 FM receiver is based on the proven
Si4700/01 FM tuner. The receiver uses a digital low-IF
architecture allowing the elimination of external
components and factory adjustments. The Si4730/31
integrates a low noise amplifier (LNA) supporting the
worldwide FM broadcast band (64 to 108 MHz). An
AGC circuit controls the gain of the LNA to optimize
sensitivity and rejection of strong interferers. An image-
reject mixer downconverts the RF signal to low-IF. The
quadrature mixer output is amplified, filtered, and
digitized with high resolution analog-to-digital
converters (ADCs). This advanced architecture allows
the Si4730/31 to perform channel selection, FM
demodulation, and stereo audio processing to achieve
superior performance compared to traditional analog
architectures.
4.4. AM Receiver
The highly-integrated Si4730/31 supports worldwide AM
band reception from 520 to 1710 kHz using a digital
low-IF architecture with a minimum number of external
components and no manual alignment required. This
digital low-IF architecture allows for high-precision
filtering offering excellent selectivity and SNR with
minimum variation across the AM band. The DSP also
provides adjustable channel step sizes in 1 kHz
increments, AM demodulation, soft mute, seven
different channel bandwidth filters, and additional
features, such as a programmable automatic volume
control (AVC) maximum gain allowing users to adjust
the level of background noise.
Similar to the FM receiver, the integrated LNA and AGC
optimize sensitivity and rejection of strong interferers
allowing better reception of weak stations.
The Si4730/31 provides highly-accurate digital AM
tuning without factory adjustments. To offer maximum
flexibility, the receiver supports a wide range of ferrite
loop sticks from 180–450 μH. An air loop antenna is
supported by using a transformer to increase the
effective inductance from the air loop. Using a 1:5 turn
ratio inductor, the inductance is increased by 25 times
and easily supports all typical AM air loop antennas
which generally vary between 10 and 20 μH.
4.5. Digital Audio Interface
The digital audio interface operates in slave mode and
supports a variety of MSB-first audio data formats
including I 2 S and left-justified modes. The interface has
three pins: digital data input (DIN), digital frame
synchronization input (DFS), and a digital bit
synchronization input clock (DCLK). The Si473x
supports a number of industry-standard sampling rates
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.
4.5.1. Audio Data Formats
The digital audio interface operates in slave mode and
supports three different audio data formats:
? I 2 S
? Left-Justified
? DSP Mode
In I 2 S mode, by default the MSB is captured on the
second rising edge of DCLK following each DFS
transition. The remaining bits of the word are sent in
order, down to the LSB. The left channel is transferred
first when the DFS is low, and the right channel is
transferred when the DFS is high.
In left-justified mode, by default the MSB is captured on
the first rising edge of DCLK following each DFS
transition. The remaining bits of the word are sent in
order, down to the LSB. The left channel is transferred
first when the DFS is high, and the right channel is
transferred when the DFS is low.
In DSP mode, the DFS becomes a pulse with a width of
1DCLK period. The left channel is transferred first,
followed right away by the right channel. There are two
options in transferring the digital audio data in DSP
mode: the MSB of the left channel can be transferred on
the first rising edge of DCLK following the DFS pulse or
on the second rising edge.
In all audio formats, depending on the word size, DCLK
frequency, and sample rates, there may be unused
DCLK cycles after the LSB of each word before the next
DFS transition and MSB of the next word. If preferred,
the user can configure the MSB to be captured on the
falling edge of DCLK via properties. The number of
audio bits can be configured for 8, 16, 20, or 24 bits.
4.5.2. Audio Sample Rates
The device supports a number of industry-standard
sampling rates including 32, 40, 44.1, and 48 kHz. The
digital audio interface enables low-power operation by
eliminating the need for redundant DACs on the audio
baseband processor.
Rev. 1.0
19
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