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MC34118

Motorola
Part Number MC34118
Manufacturer Motorola
Description VOICE SWITCHED SPEAKERPHONE
Published Dec 27, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC34118/D ARCHIVED - 6/2010 Voice Switched Speakerphone C...
Datasheet PDF File MC34118 PDF File

MC34118
MC34118

Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC34118/D ARCHIVED - 6/2010 Voice Switched Speakerphone Circuit Silicon Monolithic Integrated Circuit The MC34118 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 60 Hz 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 MC34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically 5.
0 mA.
The 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 featurephone.
• Improved Attenuator Gain Range: 52 dB Between Transmit and Receive • Low Voltage Operation for Line--Powered Applications (3.
0 -- 6.
5 V) • 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 Ton...


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