The NE570 is a versatile low-cost dual gain control circuit in which either channel may be used as a dynamic range compressor or expander. Each channel has a full-wave rectifier to detect the average value of the signal, a linearized temperature-compensated variable gain cell, and an operational amplifier. The NE570 is well suited for use in cellular radio and radio communications systems, modems, telephone, and satellite broadcast/receive audio systems.
FEATURES
• Complete compressor and expander in one IC
• Temperature compensated
• Greater than 110 dB dynamic range
• Operates down to 6 VDC
• System levels adjustable with external components
• Distortion may be trimmed out
APPLICATIONS
• Cellular radio
• Telephone trunk compander
• High-level limiter
• Low-level expander—noise gate
• Dynamic noise reduction systems
• Voltage-controlled amplifier
• Dynamic filters
