MC33219A

Order this document by MC33219A/D MC33219A Voice Switched Speakerphone The Motorola MC33219A 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 mute, transmit and receive attenuators, a background monitoring system for both the transmit and receive paths, and level detectors for each path. An AGC system reduces the receive gain on long lines where loop current and power are in short supply. A dial tone detector prevents fading of dial tone. A Chip Disable pin permits conserving power when the circuit is not in use. The volume control can be implemented with a potentiometer. The MC33219A can be operated from a power supply, or from the telephone line, requiring typically 3.2 mA. It can be used in conjunction with a variety of speech networks. Applications include not only speakerphones, but intercoms and other voice switched devices. The MC33219A is available in a 24 pin narrow body DIP, and a wide body SOIC package. Supply Voltage Range: 2.7 to 6.5 V VOICE SWITCHED SPEAKERPHONE CIRCUIT SEMICONDUCTOR TECHNICAL DATA 24 1 P SUFFIX PLASTIC PACKAGE CASE 724 Attenuator Range: 53 dB Background Noise Monitor for Each Path 2 Point Signal Sensing Volume Control Range: Typically 40 dB Microphone and Receive Amplifiers Pinned Out for Flexibility Microphone Amplifier can be Muted...