BCM2002X Datasheet, PDF (2/2 Pages) Broadcom Corporation. – BCM2002X 2.4 GHZ BLUETOOTH FRAC-N RADIO

RF Input
BCM2002X OVERVIEW
BCM2002X Functional Block Diagram
Demodulator
Bit Slicer
Digital Output
LO
Generation
RF Output
Calibration
Frac-N PLL
Loop
Filter
Modulator
Control
Interface
Digital Input
Control I/F
(BlueRF)
The BCM2002X is a Bluetooth 1.1 compliant integrated radio
transceiver device operating in the 2.4 GHz band. It is ideal for
integration in mobile phone applications where the radio has
been designed to handle the harsh environments of mobile
phones to provide the highest communication link quality of
service.
The BCM2002X uses fractional-N frequency generation
technology to synthesize the different reference frequencies for
mobile phone applications. The fractional-N technology
eliminates the need for a dedicated reference crystal, which
lowers BOM cost and eliminates an additional RF noise source.
The receiver front-end consists of a low-noise amplifier and an
image reject mixer. Balanced mixer structures fed by accurate
quadrature LO signals allow an excellent noise figure and strong
image rejection.
A low IF frequency allows for high performance amplifier and
filter designs in CMOS. The bandpass filter structure features
self-calibration circuitry that automatically adjusts circuit
elements to compensate for any process variation. This
eliminates tuning and ensures that process and temperature
variation are uniform across the devices. The IF amplifiers
provide a limiting function so that the following stages always
get a constant signal level regardless of the RF input level. An
RSSI signal is also generated in these amplifiers for the system
to determine signal strength. The signal is then filtered further,
demodulated, and finally sent to a bit slicer to generate logic
level data output.
The BCM2002X is controlled via a BlueRF unidirectional
interface. BlueRF is a Bluetooth industry-standard specification
that provides compatibility between Bluetooth RF and baseband
chips. This interface provides control for the various sections of
the chip, defines data transfers and allows access to the various
internal registers of the device.
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© 2003 by BROADCOM CORPORATION. All rights reserved.
2002X-PB04-R-06.13.03
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