CT34118 Voice Switched Speakerphone Circuit

PublishTime：2022-06-08

●The CT34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a microphone amplifier with adjustable gain and MUTE control, Transmit and Receive attenu-atorswhichoperateinacomplementarymanner,leveldetectorsatbothinputandoutputofbothattenua-tors, and background noise monitors for both the transmit and receive channels. A Dial Tone Detector pre-vents the dial tone from being attenuated by the Receive background noise monitor circuit. Also included are 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 reseive 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 CT34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5.0mA. The CT34118 can be interfaced directly to Tip and Ring (through a coupling trans-former) for stand-alone operation, or it can be used in conjunction with a handset speech network and or other features of a feature phone.
●FEATURES
■Improved Attenuator Gain Range: 52dB Between Transmit and Receive
■Low Voltage Operation for Line-Powered Applications (3.0-6.5V)
■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 Deined Function
■Dial Tone Detector to Inhibit Receive Idle Mode During Dial Tone Presence

Brand of Product：	CHIPTALK
Part#：	CT34118 More Part#
Product Category：	Voice Switched Speakerphone Circuit More
Application：	More
Data Type：	Datasheet More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	Jan, 2021
Version Number：	Rev. 1_Jan, 2021
Data Encoding：
Data Size：	1.7 MB

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