THAT4301P20-I

Combines in a single IC all the active circuitry needed to construct a wide range of dynamics processors. The 4301 includes a high-performance, exponentially-controlled Blackmer® VCA, a log-responding RMS-level sensor and three general-purpose opamps. The Blackmer VCA provides two opposing- polarity, voltage- sensitive control ports. Dynamic range exceeds 115 dB, and THD is typically 0.003% at 0 dB gain. The RMS detector provides accurate rms-to-dc conversion over an 80 dB dynamic range for signals with crest factors up to 10. One opamp is dedicated as a current-to-voltage converter for the VCA, while the other two may be used for the signal path or control voltage processing. The combination of exponential VCA gain control and logarithmic detector response - "decibel-linear" response - simplifies the mathematics of designing the control paths of dynamics processors.