BlueCore™4-Audio ROM

General Description
BlueCore™4-Audio ROM is a single chip radio and baseband IC for Bluetooth 2.4GHz systems including enhanced data rates (EDR) to 3Mbps.
BC413159A contains 6Mbit of embedded ROM. When used with the CSR Bluetooth software stack, it provides a fully compliant Bluetooth system to v2.0+EDR of the specification for data and voice communications.
BlueCore™4-Audio ROM 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 v2.0+EDR specification (all mandatory and optional features).

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 v2.0+EDR specifcation 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 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 an external crystal or with an external clock using sinusoidal or logic-level signals
Accepts frequencies between 8 and 32MHz (in multiples of 250kHz); additionally accepts 7.68, 14.44, 15.36, 16.2, 16.8, 19.2, 19.44, 19.68, 19.8 and 38.4MHz TCXO frequencies typically used in GSM and CDMA devices

Baseband and software
Internal 6Mbit ROM
Internal 48kB RAM to support EDR. 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
Digital enhancements to add bass cut, side tone and treble boost
Analogue enhancements to support single-ended speaker drive capability and reference availability

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