Dot and Bar-Graph Display Generators
XR·2279
Dot and Bar-Graph Display Generators
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAM
The XR-2279 is a 12 point ...
Description
XR·2279
Dot and Bar-Graph Display Generators
GENERAL DESCRIPTION
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-
iting resistors are required. A special feature of the XR2279 is the four highest outputs sink one half the current of the lower eight; this allows equivalent brightness with red and green mixed displays.
Dot or bar mode selection is provided. The twelve out-
put levels are in 3 dB steps from - 27 dB to + 6 dB. The
reference point is externally adjustable.
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...
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