AIROC™ Bluetooth® system on chip for automotive applications
Integrated radio transceiver
6
Integrated radio transceiver
The CYW89820 has an integrated radio transceiver that has been designed to provide low power operation in the
globally available 2.4 GHz unlicensed ISM band. It is fully compliant with Bluetooth® Radio Specification 5.0 and
meets or exceeds the requirements to provide the highest communication link quality of service.
6.1
Transmitter path
The CYW89820 features a fully integrated transmitter. The baseband transmit data is GFSK modulated in the
2.4 GHz ISM band.
6.1.1
Digital modulator
The digital modulator performs the data modulation and filtering required for the GFSK signal. The fully digital
modulator minimizes any frequency drift or anomalies in the modulation characteristics of the transmitted
signal.
6.1.2
Power amplifier
The CYW89820 has an integrated power amplifier (PA) that can transmit up to +10.5 dBm for class 1 operation.
6.2
Receiver path
The receiver path uses a low IF scheme to down-convert the received signal for demodulation in the digital
demodulator and bit synchronizer. The receiver path provides a high degree of linearity, and an extended
dynamic range to ensure reliable operation in the noisy 2.4 GHz ISM band. The front-end topology, which has
built-in out-of-band attenuation, enables the CYW89820 to be used in most applications without off-chip filtering.
6.2.1
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.
6.2.2
Receiver signal strength indicator
The radio portion of the CYW89820 provides a receiver signal strength indicator (RSSI) to the baseband. This
enables the controller to take part in a Bluetooth® power-controlled link by providing a metric of its own receiver
signal strength to determine whether the transmitter should increase or decrease its output power.
6.3
Local oscillator
The local oscillator (LO) provides fast frequency hopping (1600 hops/second) across the band. The CYW89820
uses an internal loop filter.
Datasheet
16
002-25826 Rev. *G
2022-09-24
INFINEON [ Infineon ]
