This document describes the features and characteristics of the TEA1095 voice switched speakerphone integrated circuit, including external power supply with power-down function, adjustable gain transmit channel, transmit mute function, adjustable gain receive channel, logarithmic volume control, receive mute function, and duplex controller with various adjustable parameters. The TEA1095 is suitable for mains, battery or line-powered telephone sets, cordless telephones, answering machines, fax machines, and hands-free car kits.
The Philips TEA1095 is a bipolar integrated circuit designed for use in hands-free telephone sets, cordless phones, answering machines, fax machines, and hands-free car kits. It functions as a voice switched speakerphone IC that incorporates a transmit amplifier, a receiver channel amplifier, and a duplex controller with signal and noise monitors for both channels.
The device offers features such as an external power supply with a power-down function, externally adjustable gain for both transmit and receive channels, and logarithmic volume control via a linear potentiometer. The duplex controller includes decision logic with adjustable switch-over timing and idle mode timing to manage the transition between transmit, receive, and idle modes while maintaining a constant sum of gain.
| Transmit voltage gain | -15.6 to -1 dB |
|---|---|
| Receive voltage gain | -6.5 to - dB |
| Operating ambient temperature | -25 to +75 °C |
| Transmit input resistance | 20 kΩ |
| Receive input resistance | 20 kΩ |
It is used in mains, battery or line-powered telephone sets, cordless telephones, answering machines, fax machines, and hands-free car kits.
The switching range is adjustable from -40 dB to +12 dB relative to a reference resistor of 365 kΩ.
When the voltage on the PD input is HIGH, the current consumption from Vgg is reduced to 140 µA.