TCM4400E

· 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 BGAE Packages
· Single 3-V Supply Voltage
· Internal Voltage Reference
· Extended RF Control Voltages
· Advanced Power Management
· GSM-Digital Audio Interface (DAI)
· 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, Programmable Gain Amplifiers, Volume Control, and Side-Tone Control

Supply voltage range, AV_DD, DV_DD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 to 6 V
Maximum voltage on any input, V_I max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_DD +0.3 V / V_SS 0.3 V
Storage temperature, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . .  65 to 150
Maximum junction temperature, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .. . . 150

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Voltage measurements with respect to GND.

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 icrocontroller 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 icrocontroller.

A four-pin parallel port of the TCM4400E 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 TCM4400E 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) of the TCM4400E, 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.