Hot-selling and scarce U4089B-P Monolithic Integrated Feature Phone Circuit SSOP44 spot stock

Product Descriptions

The telephone circuit U4089B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, sidetone equivalent and ear protection rectifiers. The circuit is line-powered and contains all components necessary for the amplification of signals and adaptation to the line.

An integrated voice switch with loudspeaker amplifier enables loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits.

Product Features

• DC Characteristic Adjustable

• Transmit and Receive Gain Adjustable

• Symmetrical Input of Microphone Amplifier

• Anti-clipping in Transmit Direction

• Automatic Line-loss Compensation

• Built-in Ear Protection

• DTMF and MUTE Input

• Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification

• Integrated Amplifier for Loudhearing Operation

• Anti-clipping for Loudspeaker Amplifier

• Improved Acoustical Feedback Suppression

• Selectable Line Impedance

• Voice Switch

• Supply Voltages for All Functional Blocks of a Subscriber Set

• Operation Possible from 10-mA Line Current

• Filters Against EMI on Critical I/O

Product Benefits

• Complete System Integration of Analog Signal Processing on One Chip

• Very Few External Components

• Less Components for EMI protection

Product Applications

• Feature Phones

• Answering Machines

• Fax Machines

• Speaker Phones

Product Photos

For more product information, please download the PDF