TWL1107PWR

Overview

The TWL1107PWR is a voice-band audio processor (VBAP) designed for analog and digital wireless handsets. It performs transmit A/D conversion, receive D/A conversion, and filtering within a 300-Hz to 3.4-kHz passband. Operating on a 2.7-V to 3.3-V supply, it supports selectable 13-bit linear or 8-bit A-law companded modes. The device features a differential microphone input with external gain setting and a differential earphone output capable of driving loads from 8 Ω to 32 Ω. It generates internal clocks from a 2.048-MHz master clock input and includes programmable volume control in linear mode.

Feature Summary

• Selectable 13-bit linear or 8-bit A-law companded conversion modes
• Differential microphone input with externally set gain and differential earphone output
• Programmable receive volume control in linear mode (-18 dB to +3 dB)
• Integrated microphone and earphone mute functions

Applications

• Analog and digital wireless handsets
• Voice-enabled terminals
• Telecommunications applications

Procurement Notes

Verify the specific package variant against the datasheet. The TWL1107PWR indicates a PW (TSSOP) package. Confirm that the ordering suffix matches the required tape-and-reel or bulk configuration if applicable, as packaging options may vary by manufacturer lot. Ensure the component meets the -40°C to 85°C operating temperature range specified for this part number.

Selection Notes

Select the TWL1107PWR when a dedicated voice-band processor is required for wireless handset designs. Choose the linear mode for higher fidelity requirements using 13-bit resolution, or the A-law mode for standard telephony compatibility using 8-bit companding. Ensure the system provides a stable 2.048-MHz master clock and that the power supply remains within the 2.7-V to 3.3-V range for optimal performance.

Part Context

The TWL1107 belongs to Texas Instruments' VBAP family, specialized for voice-band communications. It integrates transmit and receive filters meeting CCITT G.714 standards. The device simplifies design by generating internal clocks from a single master clock input and combining analog front-end amplification with digital modulation and demodulation in a single low-profile package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin-to-pin compatibility and electrical specifications with alternative voice-band processors before substitution.

FAQ

How is the microphone gain configured?

The microphone gain is set externally using resistors connected to the MICGAIN+ and MICGAIN– terminals. For a recommended gain of 23.5 dB, use R2 = 34 kΩ and R3 = 510 kΩ.

What determines the sampling rate?

The sampling rate is fixed at 8 kHz, determined by the PCMSYN signal which must be derived from the 2.048-MHz master clock with a divide ratio of 256.

How is receive volume controlled?

In linear mode, the three least significant bits (RXVOL) of the 16-bit PCMI data sample control the volume in 3-dB steps from -18 dB to +3 dB. Volume control is fixed at 0 dB in companded mode.