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BL34118

SHANGHAI BELLING
Part Number BL34118
Manufacturer SHANGHAI BELLING
Description Voice Switched Speakerphone Circuit
Published Dec 19, 2006
Detailed Description www.DataSheet4U.com BL34118 Voice Switched Speakerphone Circuit BL34118 The BL34118 Voice Switched Speakerphone Circuit...
Datasheet PDF File BL34118 PDF File

BL34118
BL34118

Overview
www.
DataSheet4U.
com BL34118 Voice Switched Speakerphone Circuit BL34118 The BL34118 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 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 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 receive channel, or for other functions.
A chip Disable pin permits powering down the entire circuit to conserve p...


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