BCM4325
Preliminary Data Sheet
6/30/09
FM RADIO FEATURES
Major FM Radio features include:
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76 MHz to 108 MHz FM bands supported (US, Europe, and Japan)
Excellent FM radio performance with 1 μV sensitivity for 26 dB (S+N)/N
FM subsystem control using the BSC bus or through the Bluetooth HCI interface
Signal dependent stereo/mono blending
Signal dependent soft mute
Auto search and tuning modes
Audio silence detection
RSSI, IF frequency, status indicators
RDS and RBDS demodulator and decoder with filter and buffering functions
Automatic frequency jump
FM subsystem operates from 32 kHz low-power oscillator (LPO) or reference clock inputs
Improved audio interface capabilities with full-featured PCM, I2S, and analog stereo DAC
I2S can be master or slave
BLUETOOTH RADIO
The BCM4325 includes an integrated radio transceiver, optimized for use in 2.4 GHz Bluetooth wireless systems. Its design
provides low-power, low-cost, robust communications for applications operating in the globally available, 2.4 GHz,
unlicensed ISM band. The radio transceiver is fully compliant with Bluetooth radio and EDR specifications and meets or
exceeds the requirements to provide the highest communication link quality of service.
Note: Sharing a single 2.4 GHz antenna between the Bluetooth and WLAN sections is supported when an
appropriate SP3T switch is used in the external RF signal path.
TRANSMIT
The BCM4325 features a fully integrated zero-IF transmitter. The baseband transmit data is digitally GFSK-modulated in the
modem block and upconverted to the 2.4 GHz ISM band in the transmitter path. The transmitter path consists of signal
filtering, I/Q upconversion, output power amplifier (PA), and RF filtering. The transmitter path also incorporates new
modulation schemes π/4-DQPSK for 2 Mbps and 8-DPSK for 3 Mbps to support EDR.
Digital Modulator
The digital modulator performs the data modulation and filtering required for the GFSK, Π/4DQPSK, and 8-DPSK signal. The
fully digital modulator minimizes any frequency drift or anomalies in the modulation characteristics of the transmitted signal
and is much more stable than direct VCO modulation schemes.
Broadcom Corporation
Page 12
Bluetooth Radio
Document 4325-DS04-R
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