U4080B

· Operates on telephone lines, integrated reference voltage regulation
·Output power: 100 mW at a 25-W load with peak limitation
· Chip select pin for active/standby operation
· Linear volume control
· Monitoring system for background sound level
· Wide operating dynamic range through signal compression

The voice switched speakerphone integrated circuit, U4080B, incorporates a variety of functions (see below). The versality of the device is further enhanced by the provision of a large number of pins giving access to internal circuit points.