ZCC34118替代MC34118

概述：

The ZCC34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers,attenuators,level detectors,and control algorithm to form the heart of a high quality hands-free speskerphone system.Included are a microphone amplifier with adjustable gain and MUTE

control,Transmit and Receive arrenuators 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 Drtector prevents thedial tone from being attenuated by the Receive background noise monitor ciruit.Also included are two line driver amplifiers which can be used to form a hybrid ntwork 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 powering down the entire circuit to conserve power on long loops where loop current is at a minimum.

The ZCC34118 may be operated froma power supply,or it can be powered from the telephone line,requiring typically 5.0 mA. The ZCC34118 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 featurephone.

特点：

·Improved Attenuator Gain Range:52dB Between Transmit and Receive

·Low Voltage Operation for Line-Powered Applications(3.0V-6.5V)

·4-Point Signal Sensing for Improved Sensitivity

·Background Noise Monitors for Both Transmit and Receive Paths

·Microphone Amplifier Gain Set by External Resistors-Mute Function Included

·Chip Disable for Active/Standby Operation

·On Board Filter Pinned-Out for User Defined Function

·Dial Tone Detector to Inhibit Receive Idle Mode During Dial Tone Presence

·Standard 28-Pin Plastic DIP Package and SOIC Package Available

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