Dear community, what are you thinking about this nice IC?
http://www.farnell.com/datasheets/530764.pdf
THAT 2181 Series integrated-circuit voltage controlled amplifiers (VCAs) are very high performance current-in/current-out devices with two opposing-polarity, voltage-sensitive control ports. They offer wide-range exponential control of gain and attenuation with low signal distortion. The parts are selected after packaging based primarily on after-trim THD and control-voltage feedthrough performance.
Cost - $10 at moser.com
FEATURES • Wide Dynamic Range: >120 dB • Wide Gain Range: >130 dB • Exponential (dB) Gain Control • Low Distortion: ~ 0.0025 % (typical 2181A) ~ 0.005 % (typical 2181C) • Wide Gain-Bandwidth: 20 MHz • Dual Gain-Control Ports (pos/neg) • Pin-Compatible with 2150-Series