Filter
Top Products
1–1
1 Introduction
Texas Instruments (TI) TCM4300 IS-54B advanced RF cellular telephone interface circuit (ARCTIC)
provides a baseband interface between the digital signal processor (DSP), the microcontroller, and the RF
modulator/demodulator in a dual-mode IS-54B cellular telephone. See the TCM4300 functional block
diagram.
In the analog mode, the TCM4300 provides all required baseband filtering as well as transmit D/A
conversion and receive A/D conversion using dual 10-bit sigma-delta converters. In addition, a WBD
wide-band data (WBD) –10 kb/s Manchester frequency shift key (FSK) demodulator is provided to allow
reduced DSP processing load during subscriber standby mode.
In the digital mode, the TCM4300 accepts I and Q baseband data and performs A/D and D/A conversion
and square-root raised-cosine filtering using dual 10-bit sigma-delta converters. The TCM4300 also has a
π/4-DQPSK modulation encoder for dibit-to-symbol conversion in the digital transmit mode.
The microcontroller interface is compatible with a wide range of microcontrollers. A microcontroller can be
used to communicate with the user interface (keyboard, display, etc.) and to program up to three frequency
synthesizers by using the on-chip synthesizer interface circuit.
The TCM4300 provides advanced power control to minimize the power consumption of many dual-mode
telephone functional blocks such as the speech codec, FM receiver, I and Q demodulator, transmitter signal
processor, and RF power amplifier. In addition, the TCM4300 is designed to reduce system power
consumption through low-voltage operation and standby mode.
The TCM4300 is offered in the 100-pin PZ package and is characterized for free-air operation from
–40°C to 85°C.
1.1 Features
• Compliance With TIA IS-54B Dual-Mode Cellular Standard
• Baseband Transmit Digital-to-Analog (D/A) Conversion and Receive Analog-to-Digital (A/D)
Conversion in Analog Transmit Mode Using Dual 10-Bit Sigma-Delta Converters
• Square Root Raised Cosine (SQRC) Filtering in the Digital Mode Using Dual 10-Bit Sigma-Delta
Converters
• π/4-Differential Quadrature Phase-Shift Key (DQPSK) Modulation Encoder in Digital Transmit
Mode
• Power Control Supervision for Radio Frequency (RF) Power Amplifier, Automatic Frequency
Control (AFC), Automatic Gain Control (AGC), and Synthesizer
• Received Signal Strength Indicator (RSSI) and Battery-Level A/D Conversion Circuitry
• Internal Clock Generation
• Wide-Band Data Clock Recovery and Manchester Decoding
• General-Purpose Digital Signal Processor (DSP) and Microcontroller Interface
• 3.3-V and 5-V Operation
• Low Power Consumption
TI and ARCTIC are trademarks of Texas Instruments Incorporated.