XR-2278 Overview
FUNCTIONAL BLOCK DIAGRAM The XR-2277 and XR-2278 are 12 point level detector circuits designed for direct interfacing to light emitting diode (LED) moving-dot or bar-graph displays. Each of the circuits is prised of an input buffer amplifier and 12 parators, biased from a resistor string at logarithmic intervals. Accuracy is enhanced by an internal reference.