Motorola A840 - Cell Phone - CDMA2000 1X, Service Manual, Page: 18 / 56

18 June 07, 2004
Theory of Operation A840
to run on a Subscriber Unit Reference (SURF) phone platform, an optional devel-
opment platform optimized to assist in evaluating, testing and debugging DMSS
software.
The MSM6300 device is offered in a 341-ball, 0.5mm pitch Chip Scale Package (CSP)
production package. Additionally, the MSM6300 solution supports QUALCOMM’s
Binary Run-time Environment for Wireless™ (BREW™) applications development
platform.
The MSM6300 device interfaces directly with QCT’s new radioOne RF ASICs.
radioOne is a revolutionary technology for CDMA transceivers that uses Zero
Intermediate Frequency (ZIF), or direct conversion, architecture for the wireless
handset market. This direct conversion eliminates the need for large IF Surface
Acoustic Wave (SAW) filters and additional IF circuitry, which significantly reduces
the handset BOM parts count, facilitating multiband and multimode handsets that
can be produced in smaller form factors. radioOne technology also incorporates the
frequency synthesis and passive elements used in converting Baseband signals to
and from RF. A single external dualband local oscillator is used for the CDMA and
GSM receiver, which will provide the capabilities needed to operate on systems
around the world and will simplify the procurement of parts and the cost of
designing CDMA/GSM handsets.
Figure 4. Motorola MSM6300 System Block Diagram