BlueCore™3-Audio Flash

BlueCore3-Audio Flash is a single chip radio and baseband IC for Bluetooth 2.4GHz systems. BlueCore3-Audio Flash contains 6Mbit of internal Flash memory. When used with the CSR Bluetooth software stack, it provides a fully compliant Bluetooth system to v1.2 of the specification for data and voice communications.
BlueCore3-Audio Flash has been designed to reduce the number of external components required which ensures production costs are minimised.
The device incorporates auto-calibration and built-in self-test (BIST) routines to simplify development, type approval and production test. All hardware and device firmware is fully compliant with the Bluetooth v1.2 Specification.
The battery charger has a nominal charge current of 90mA for part number BC31A223A, and 40mA for part number BC31A223B.

Radio
Common TX/RX terminal simplifies external matching; eliminates external antenna switch
BIST minimises production test time. No external trimming is required in production
Full RF reference designs available
Bluetooth v1.2 Specification compliant

Transmitter
+6dBm RF transmit power with level control from on-chip 6-bit DAC over a dynamic range >30dB
Class 2 and Class 3 support without the need for an external power amplifier or TX/RX switch
Class1 support using external power amplifier, with RF power controlled by an internal 8-bit DAC.

Receiver
Integrated channel filters
Digital demodulator for improved sensitivity and co-channel rejection
Real time digitised RSSI available on HCI interface
Fast AGC for enhanced dynamic range

Synthesiser
Fully integrated synthesiser; requires no external VCO, varactor diode, resonator or loop filter
Compatible with crystals between 8 and 32MHz (in multiples of 250kHz) or an external clock
Accepts 7.68, 14.44, 15.36, 16.2, 16.8, 19.2, 19.44, 19.68, 19.8 and 38.4MHz TCXO frequencies for GSM and CDMA devices with sinusoidal or logic level signals

Baseband and Software
Internal 6Mbit Flash for complete system solution
Internal 32Kbyte RAM, allows full speed data transfer, mixed voice and data, and full piconet operation
Logic for forward error correction, header error control, access code correlation, CRC, demodulation, encryption bit stream generation, whitening and transmit pulse shaping
Transcoders for A-law, μ-law and linear voice from host and A-law, μ-law and CVSD voice over air

Audio CODEC
15-bit resolution, 8kHz sampling frequency
Designed for use in voice applications such as headsets and hands-free kits
Integrated microphone amplifier and audio power amplifier

Bluetooth Stack
CSR's Bluetooth Protocol Stack runs on the on-chip MCU in a variety of configurations:
Standard HCI (UART or USB)
Fully embedded RFCOMM
Customised builds with embedded application code