BCM4339 Preliminary Data Sheet
Bluetooth Radio
Bluetooth Radio
The BCM4339 has an integrated radio transceiver that has been optimized for use in 2.4 GHz Bluetooth wireless
systems. It has been designed to provide low-power, low-cost, robust communications for applications operating
in the globally available 2.4 GHz unlicensed ISM band. It is fully compliant with the Bluetooth Radio Specification
and EDR specification and meets or exceeds the requirements to provide the highest communication link
quality.
Transmit
The BCM4339 features a fully integrated zero-IF transmitter. The baseband transmit data is GFSK-modulated
in the modem block and upconverted to the 2.4 GHz ISM band in the transmitter path. The transmitter path
performs signal filtering, I/Q upconversion, output power amplification, and RF filtering. The transmitter path also
incorporates /4-DQPSK and 8-DPSK modulations for 2 Mbps and 3 Mbps EDR support, respectively. The
transmitter section is compatible to the Bluetooth Low Energy specification. The transmitter PA bias can also be
adjusted to provide Bluetooth Class 1 or Class 2 operation.
Digital Modulator
The digital modulator performs the data modulation and filtering required for the GFSK, /4-DQPSK, 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.
Digital Demodulator and Bit Synchronizer
The digital demodulator and bit synchronizer take the low-IF received signal and perform an optimal frequency
tracking and bit-synchronization algorithm.
Power Amplifier
The fully integrated PA supports Class 1 or Class 2 output using a highly linearized, temperature-compensated
design. This provides greater flexibility in front-end matching and filtering. Due to the linear nature of the PA
combined with some integrated filtering, external filtering is required to meet the Bluetooth and regulatory
harmonic and spurious requirements. For integrated handset applications in which Bluetooth is integrated next
to the cellular radio, external filtering can be applied to achieve near-thermal-noise levels for spurious and
radiated noise emissions. The transmitter features a sophisticated on-chip transmit signal strength indicator
(TSSI) block to keep the absolute output power variation within a tight range across process, voltage, and
temperature.
Broadcom®
November 17, 2014 • 4339-DS106-R
Page 37
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