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Bluetooth clock request
❐
Bluetooth standard sniff
❐
Deep-sleep modes and software regulator shutdown
❐
TCXO input and autodetection of all standard handset clock frequencies. Also supports a low-power crystal, which can be used
■
during power save mode for better timing accuracy.
4.2 Bluetooth Radio
The CYW43353 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.
4.2.1 Transmit
The CYW43353 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 trans-
mitter PA bias can also be adjusted to provide Bluetooth Class 1 or Class 2 operation.
4.2.2 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 trans-
mitted signal and is much more stable than direct VCO modulation schemes.
4.2.3 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-syn-
chronization algorithm.
4.2.4 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, exter-
nal filtering is required to meet the Bluetooth and regulatory harmonic and spurious requirements. For integrated telematics applica-
tions 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.
4.2.5 Receiver
The receiver path uses a low-IF scheme to downconvert the received signal for demodulation in the digital demodulator and bit syn-
chronizer. The receiver path provides a high degree of linearity, an extended dynamic range, and high-order on-chip channel filtering
to ensure reliable operation in the noisy 2.4 GHz ISM band. The front-end topology, with built-in out-of-band attenuation, enables the
CYW43353 to be used in most applications with minimal off-chip filtering. For integrated telematics operation, in which the Bluetooth
function is integrated close to the cellular transmitter, external filtering is required to eliminate the desensitization of the receiver by
the cellular transmit signal.
4.2.6 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 syn-
chronization algorithm.
Document Number: 002-14949 Rev. *G
PRELIMINARY
CYW43353
Page 19 of 113
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