SA571 - ON Semiconductor

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Semiconductor Components Industries, LLC, 2006March, 2006 Rev. 41Publication Order Number: SA571 /DSA571CompandorThe SA571 is a versatile low cost dual gain control circuit in whicheither channel may be used as a dynamic range compressor orexpandor. Each channel has a full wave rectifier to detect the averagevalue of the signal, a linerarized temperature compensated variablegain cell, and an operational SA571 is well suited for use in cellular radio and radiocommunications systems, modems, telephone, and satellitebroadcast/receive audio Complete Compressor and Expandor in one IChip Temperature Compensated Greater than 110 dB Dynamic Range Operates Down to VDC System Levels Adjustable with External Components Distortion may be Trimmed Out Dynamic Noise Reduction Systems Voltage Controlled Amplifier Pb Free Packages are Available*Applications Cellular Radio High Level Limiter Low Level Expandor Noise Gate Dynamic Filters CD Player*For additional information on our Pb Free strategy and soldering details.

SA571 http://onsemi.com 4 Circuit Description The SA571 compandor building blocks, as shown in the block diagram, are a full−wave rectifier, a variable gain cell,

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