The 80-pin, 12- × 12-mm TQFP EPAD-up package greatly reduces thermal-management constraints on the PCB layout. Many operational amplifiers (op amps) are used at low signal levels—think of ...

Unlike many similar interactive LED matrix displays that are digital in nature (because it’s a lot easier), this design is pure analog, using many, many op-amps. A custom PCB houses a 4×4 array ...