MC33219A

Pinout




Specifications

Rating                                              Symbol         Min            Max           Unit
Supply Voltage                                 VCC            0.5          7.0            Vdc
Any Input                                         Vin              0.4          VCC          + 0.4 Vdc
Maximum Junction Temperature       TJ                               +150         °C
Storage Temperature Range            Tstg            65           +150         °C


Description

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 handsfree speakerphone system. MC33219A includes 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 MC33219A is not in use. The volume control can be implemented with a potentiometer.
The MC33219A can be operated from a power supply, or from thetelephone 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.