Block Diagram (SBD) - Handset: Entry

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Design Considerations

Basic mobile phones need to deliver excellent voice quality at a very affordable cost. The trend is towards chip count reduction and TI has the best offerings in the Industry.

Texas Instruments’ solutions for handsets based on the LoCosto™ single-chip solutions range in capability from voice-only GSM phones with black and white displays to more advanced handsets with robust features such as MP3, Bluetooth® solutions, and megapixel cameras. By using TI's DRP™ single-chip technology, the RF transceiver, analog codec and digital baseband are combined into a highly-integrated solution. TI’s 18 years of wireless systems expertise spans handsets across multiple communications standards; as well as wireless LAN, GPS and Bluetooth™. TI provides its customers and partners with flexible and open solutions spanning single-chip platforms, custom-to-standard solutions, reference designs and core digital signal processor and analog technologies.

Power Management

While low-cost or voice-only phones may have all functionality integrated into the ABB/DBB, some applications may require additional buck or boost converters like TPS62260 or LDOs like TPS799xx/TPS717xx for additional power rails.

Phone safety remains a care-about for low-cost phones. Because of several incidents with unsafe batteries, battery authentication may be required; TI has solutions for both ID ROM and CRC authentication (bq20xx and bq261xx). Support for different lengths of encryption key depth is provided.

Audio Considerations

Low-end phones typically require a very basic set of features that enable voice calls. A low-cost and moderate-performance audio amplifier might be considered to provide sufficient power to the speaker to improve audio quality. TI’s audio amplifier portfolio (TPAxxxx) addresses this need.

For loudspeaker applications, a SPST switch may be needed to protect the integrated baseband audio amplifier from damage. For this the TS5A23xx family provides a cost-effective solution.

ESD and Logic Considerations

To resolve I/O compatibility problems with low-cost SPI mode displays, 8-bit level shifters such as TXB0108 may be best suited. ESD protection can be provided with the TPDxEyyy family of IEC61000-4-2 protection components which are available in different numbers of channels, breakdown voltages and capacitance values.