Overview
The STK301-090 is an electronic graphic equalizer hybrid IC that incorporates electronic volume control for 7-band, 2-channel equalization for one-touch up/down control of all band gains. Further, low-profile packaging is realized using Sanyo’s insulated metal substrate technology (IMST) for the base, SC system and photoresist technologies and folded board construction.

FEATUREs
• Gain adjustable in ±2dB steps in all bands
• 13-position control with +12dB maximum boost and −12dB maximum cut in all bands
• Band center frequencies (fO): 60Hz, 150Hz, 400Hz, 1kHz, 2.5kHz, 6kHz, 15kHz
• A graphic equalization system can be constructed using 3 ICs—the STK301-090, a controller (general-purpose microcontroller) and a display LSI (LC75821 for LCDs; LC7565 for FLT/LEDs)—with the following features.
   - One-touch up/down gain control in all bands
   - One-touch memory recall of preset band settings for tailored frequency response for individual musical tastes.
   - One-touch gain reset to 0dB (flat response function) and gain boost/cut reverse around 0dB center (reverse response function) under supported software control
   - 2 control lines which can also be used to interface with the display LSI for easy connection between the display LSI and the microcontroller
• Low boost and cut operating shock noise

APPLICATIONs
• Car stereos
• Radio cassette recorders
• Home stereos