TEA1110A
低电压多功能电话传输线路与拨号器接口
DESCRIPTION
The is a versatile telephone transmission circuit providing full speech and line interface functions in electronic telephone sets. This device works at a line voltage which can be as low as 1.6V DC with reduced performance to enable parallel connection of telephone sets. It also realizes electronic switching between speeches and dialling.
FEATURES
* Low DC line voltage; operates downto 1.6V excluding voltage drop over external polarity guard
* Voltage regulator with adjustable DC voltage
* Provides a supply for external circuits
* Symmetrical high impedance inputs 64kΩ for dynamic, magnetic or piezo-electric microphones
* Asymmetrical high impedance input 32kΩ for electric microphones
* DTMF input with confidence tone
* MUTE input for pulse or DTMF dialling
* Receiving amplifier for dynamic, magnetic or piezo-electric earpieces
* AGC line loss compensation for microphone and earpiece amplifiers.