BL34118 - SHANGHAI BELLING

BL34118 Voice Switched Speakerphone Circuit

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 volts is required, at AGC circuit reduces the receive atten.

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 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 Compatible with BL34119 Speak.