BL34118 Datasheet (SHANGHAI BELLING) - Voice Switched Speakerphone

BL34118, Voice Switched Speakerphone

Filter output.

Output impedance is less than 50 ohms.

Filter input.

Input impedance is greater than 1.0 Mohm.

Chip Disable.

A logic low (<0.8V) sets normal operation.

A logic high (>2.0V) disables the IC to conserve power.

Input impedance is nominally 90 kΩ.

4 VCC A supply voltage of +2.8 to +6.5

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 backg

BL34118 Features

* of a feature phone. Improved Attenuator Gain Range: 52 dB 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