TWL1107

The TWL1107 has the following features including Designed for Analog and Digital Wireless Handsets, Voice-Enabled Terminals, and Telecommunications Applications;2.7-V to 3.3-V Operation;Selectable 13-Bit Linear or 8-Bit A-Law Companded Conversion;Differential Microphone Input with External Gain Setting;Differential Earphone Output Capable of Driving a 32- to 8- Load;Programmable Volume Control in Linear Mode;Microphone (MIC) and Earphone (EAR)Mute Functions;Typical Power Dissipation of 0.03 mW in Power-Down Mode.

The TWL1107 voice-band audio processor (VBAP) is designed to perform the transmit encoding analog-to-digital (A/D) conversion, the receive decoding digital-to-analog (D/A) conversion, and the transmit and receive filtering for voice-band communications systems. The TWL1107 device operates in either the 13-bit linear or 8-bit companded (A-law) mode. The VBAP generates its own internal clocks from a 2.048-MHz master clock input.The PCM interface transmits and receives data at the PCMO and PCMI terminals respectively. The data is transmitted or received at the MCLK speed once on each PCMSYN cycle. The PCMSYN can be driven by an external source that is derived from the master clock and used as an interrupt to the host controller.

This TWL1107 device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These TWL1107 circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,Method 3015; however, it is advised that precautions be taken to avoid application of any voltage higher than maximum-rated voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level,preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.