MC34118G-S28-R 语音切换免提电话IC

详细描述

UTC MC34118 语音切换免提电话集成电路集成了必要的放大器、衰减器、电平检测器和控制算法，构成了高质量免提免提电话系统的核心。

它包括一个具有可调增益和静音控制的麦克风放大器。

以互补方式工作的发射和接收衰减器、两个衰减器输入和输出端的电平检测器，以及发射和接收通道的背景噪声监视器。

拨号音检测器可防止拨号音被接收背景噪声监控电路衰减。还有两个线路驱动放大器，可用于与外部耦合变压器一起形成混合网络。

高通滤波器可用于滤除接收通道中的 60Hz 噪声，或用于其他滤波功能。

芯片禁用引脚允许关闭整个电路以节省回路电流最小的长回路的功率。

UTC MC34118 可以由电源供电，也可以由电话线供电，通常需要 5mA。

UTC MC34118 可以直接连接到 TIP 和 RING（通过耦合变压器）进行独立操作，或者它可以与手机语音网络和/或功能电话的其他功能结合使用。

The UTC MC34118 voice switched speaker-phone integrated circuit incorporates the necessary amplifiers, attenuators, level detectors and control algorithm to form the heart of a high quality hands-free speaker-phone system.

It includes a microphone amplifier with adjustable gain and mute control.

Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels.

A dial tone detector prevents the dial tone from being attenuated by the receive background noise monitor circuit. Also two line driver amplifiers which can be used to form a hybrid network in conjunction with an external coupling transformer.

A high-pass filter can be used to filter out 60Hz noise in the receive channel, or for other filtering functions.

A chip disable pin permits powers down the entire circuit to conserve power on long loops where loop current is at a minimum.

The UTC MC34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5mA.

The UTC MC34118 can be interfaced directly to TIP and RING( through a coupling transformer) for stand-alone operation, or it can be used in conjunction with a handset speech network and/or other features of a feature phone.

规格书和资料

Data Sheet