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.
The NE570 is a versatile low‑cost dual‑gain control IC that can function as a compressor or expander. Each channel includes a full‑wave rectifier, a temperature‑compensated variable‑gain cell, and an operational amplifier, making it suitable for cellular radios, modems, telephone systems, and satellite audio applications.
The device operates from 6 V to 24 V, delivers up to 20 mA output current, and provides a dynamic range greater than 110 dB with distortion as low as 0.05 % when trimmed. Detailed pin‑out, electrical characteristics, and recommended external components are provided for both compressor and expander configurations.