XR-2279 Datasheet (Exar) - Dot and Bar-Graph Display Generators

XR-2279, Dot and Bar-Graph Display Generators

FUNCTIONAL BLOCK DIAGRAM The XR-2279 is a 12 point logarithmic dot or bar-graph generator/LED driver_ The device compares an input signal with an adjustable reference and graphically displays the results_ Since LED driving current is provided by on board adjustable current sources, no current lim-

XR-2279 Features

* Direct LED Interface Constant Three dB/Step Logarithmic Scale External Dot/Bar Mode Select for Dot/Bar-Graph Formats Adjustable Output Current Levels Current Source Outputs APPLICATIONS Bar Graph Display Generator Moving-dot Display Generator Logarithmic Level