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TCM8030 Datasheet(PDF) 10 Page - Texas Instruments

Part # TCM8030
Description  Baseband Processor for Analog Cellular Telephones
Download  91 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TCM8030 Datasheet(HTML) 10 Page - Texas Instruments

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1 Introduction
The TCM8030 baseband processor for analog cellular telephones provides all the baseband signal
processing required for any of the following standards for mobile and hand-portable cellular telephones:
advanced mobile telephone service (AMPS); extended advanced mobile telephone service (EAMPS);
narrowband advanced mobile telephone service (NAMPS); total access communication system (TACS);
extended total access communication system(ETACS); Japanese total access communication system
(JTACS), and narrowband total access communications system (NTACS).
The analog section of the TCM8030 performs all filtering required for the speech, data, supervisory audio
tone (SAT), and signaling tone (ST) paths. It has an integrated, International Telegraph and Telephone
Consultative Committee (CCITT) compatible compandor as well as microphone preamplifiers and a
differential, 32-
Ω earpiece driver to complete the full integration of the baseband audio signal paths.
The digital section of the device implements the data transceiving, data processing, and SAT functions
including data recovery, majority voting, Bose-Chaudhuri-Hocquenghem (BCH) decoding, BCH encoding,
transmission (TX) frame assembly, and SAT generation, detection, and regeneration. The TCM8030
supports both narrowband standards, NTACS and NAMPS, with full implementation of the narrowband data,
and digital supervisory audio tone (DSAT) and digital signaling tone (DST) filtering and processing functions.
An on-chip, automatic frequency control (AFC) circuit also facilitates narrowband operation.
Communication with the microcontroller is through a simple four-wire serial interface.
In addition to these basic signal processing requirements, the TCM8030 integrates many of the ancillary
functions required in a typical FM cellular telephone. Included are three 8-bit digital-to-analog converters
(DACs), a dual-tone multiple-frequency (DTMF) generator, an 8-bit programmable counter/timer, an
independent watchdog timer, two 8-bit microcontroller expansion ports, and a 4-bit keyboard interrupt port.
Clock operation is through a pin-selectable on-chip crystal-referenced oscillator, an external clock source,
or an external temperature-controlled crystal oscillator (TCXO).
The TCM8030 is designed for ultra low-power applications and is manufactured using a low-power
complementary metal-oxide semiconductor (CMOS) process. It operates from a single 2.7-V to 5.5-V supply
and has five power-saving modes in addition to normal operation. The TCM8030 also features a total
power-down mode in which the TCM8030 waits for the user to press the power-on key located on the
telephone keyboard. Also implemented are two features that extend idle mode operation time.
One feature enables a reduction in the duty cycle of the microcontroller, and the other periodically shuts
down the RF receiver. These features reduce the system power consumption to a minimum during idle mode
and significantly increase the telephone standby time.
The gain and signal selection paths are software configurable so that audio trimming functions do not require
manual intervention during telephone calibration on the production line. This production-time reduction
feature, together with its high level of integration and low-power design, makes the TCM8030 an ideal
solution for FM analog cellular telephones.


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