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60dB wide-dynamic-range, low-frequency AGC circuit using a single VGA

Posted: 26 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:AD8336 application note? AGC circuit? VGA?

Low frequency automatic gain control (AGC) circuits are used in audio and power equipment for applications such as sensitive microphone preamplifiers (preamps) and regulators. This application note describes a low frequency AGC circuit using a wide dynamic range AD8336 variable gain amplifier (VGA) from Analog Devices as the gain control element, an AD736 rms-to-DC converter as the detector, a low cost rail-to-rail AD8551 op amp and an ADP3339 LDO as the reference. Because of its wide controllable gain range and circuit flexibility, the AD8336 is featured in this application note.

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Related Datasheets
Part Number Description Category
? AD8336 General-Purpose, ?55°C to +125°C, Wide Bandwidth, DC-Coupled VGA Actives - Sensors and Transducers



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