TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
Applications Include GSM 900,
PCS 1900, and DCS 1800 Cellular
Telephones
80-Pin TQFP (0.4 mm or 0.5 mm Lead
Pitch) or 80-Ball MicroStar BGA
Packages
MCU and DSP Serial Interface
Five Ports Auxiliary A/D
Meets JTAG Testability Standard (IEEE
Std 1131.1-1990)
Baseband Codec-GMSK Modulator
With On-Chip Burst Buffer
Voice Codec Features: Microphone
Amplifier and Bias Source,
Single 3-V Supply Voltage
Internal Voltage Reference
Extended RF Control Voltages
Advanced Power Management
GSM-Digital Audio Interface (DAI)
Programmable Gain Amplifiers, Volume
Control, and Side-Tone Control
description
The TCM4400E global system for mobile communication (GSM) baseband RF interface circuit is designed for
GSM 900 , PCS1900, and DCS 1800 European digital cellular telecommunication systems. It performs the
interface and processing of voice signals, generates baseband in-phase (I) and quadrature (Q) signals, and
controls the signals between a digital signal processor (DSP) and associated RF circuits.
The TCM4400E includes a second serial interface for use with a microcontroller. Through this interface, a
microcontroller can access all the internal registers that can be accessed through the DSP digital serial
interface. This option is intended for applications in which part of the L1 software is implemented in the
microcontroller.
A four-pin parallel port is dedicated to the full control of the digital audio interface (DAI) to the GSM system
simulator; the DAI consists of system simulator reset (SSRST) control, clock generation, and rate adaptation
with the DSP.
The voice processing portion of the device includes microphone and earphone amplifiers, analog-to-digital
(A/D) and digital-to-analog (D/A) converters, speech digital filtering, and a serial port.
The baseband processing portion of the device includes a two-channel uplink path, a two-channel downlink
path, a serial port, and a parallel port. The uplink path performs Gaussian minimum shift keying (GMSK)
modulation and D/A conversion, and it has smoothing filters to provide the external RF circuit with I and Q
baseband signals. The downlink path performs antialiasing, A/D conversion, and channel separation filtering
of the baseband I and Q signals. The serial port allows baseband data exchange with the DSP, and the parallel
port controls precise timing signals.
Auxiliary RF functions such as automatic frequency control (AFC), automatic gain control (AGC), power control,
and analog monitoring are also implemented in the TCM4400E. Internal functional blocks of the device can be
separately and automatically powered down with GSM RF windows.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MicroStar BGA is a trademark of Texas Instruments.
Copyright 2000, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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