BCM4330 Preliminary Data Sheet
FM Transceiver Subsystem
Section 9: FM Transceiver Subsystem
FM Radio
The BCM4330 includes a completely integrated FM radio receiver and transmitter with RDS/RBDS covering all
FM bands from 65 MHz to 108 MHz. The transceiver is controlled through commands on the HCI. FM received
2
audio is available as stereo analog output or in digital form through I S or PCM. The FM audio to be transmitted
2
can be delivered via stereo analog audio input or in digital form via the I S or PCM interface. The FM radio is
capable of operating from the 32.768 kHz LPO clock.
Digital FM Audio Interfaces
The FM audio can be received or transmitted via the shared PCM and I S pins, and the sampling rate is
2
2
nominally at 48 kHz. The BCM4330 supports a three-wire PCM or I S audio interface in either master or slave
configuration. The master or slave configuration is selected using vendor specific commands over the HCI
interface. In addition, multiple sampling rates are supported, derived from either the FM or Bluetooth clocks.
In master mode, the clock rate is either of the following:
• 48 kHz x 32 bits per frame = 1.536 MHz
• 48 kHz x 50 bits per frame = 2.400 MHz
In slave mode, any clock rate is supported up to a maximum of 3.072 MHz.
Analog FM Audio Interfaces
The demodulated FM audio signal is available as line-level analog stereo output, generated by twin internal
high SNR audio DACs.
FM Over Bluetooth
The BCM4330 can output received FM audio onto Bluetooth using one of following three links: eSCO, WBS, and
A2DP. In all of the above modes, once the link has been set up, the host processor can enter sleep mode while
the BCM4330 continues to stream FM audio to the remote Bluetooth device, allowing the system current
consumption to be minimized.
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 66
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