The SA572 is a dual-channel high-performance gain control circuit in which either channel can be used for dynamic range compression or extension. Each channel has a full-wave rectifier to detect the average value of the input signal, a linearized, temperature-compensated variable gain unit (G), and a dynamic time constant buffer.
SA572 Pin definition
SA572 Block Diagram
SA572 Test Circuit
The buffer allows independent control of dynamic attack and recovery times with minimal external components and improved low-frequency gain control of ripple distortion than previous compilers. The SA572 is used for noise reduction in high performance audio systems. It can also be used in a wide range of communication systems and video recording applications.
Simplified rectifier schematic diagram
Features
● Independent control of attack and recovery times
● Improved low frequency gain control ripple
● Complementary gain compression and extension external operational amplifier
● Wide dynamic range − greater than 110db
● Temperature compensated gain control
● Low distortion gain unit
● Low noise −6.0 V typical
● Wide supply voltage range - 6.0 V-22 V
● The system level is adjustable with external components
● It is a lead-free device
Applications
● Dynamic noise reduction system
● Voltage control amplifier
● Stereo expander
● Automatic level control
● Advanced limiter
• Low noise gate
• State variable filter
