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Aeroflex Circuit Technology

SCD8502 REV A 10/26/01 Plainview NY (516) 694-6700

Organization and Application

The ACT8502 consists of six 16 channel muxes arranged as shown in the Block Diagram. The

ACT8502 design is inherently Radiation Hard due to the HS1840RH Multiplexers as well as

Microsemi Corp. Transient Suppressors (Reference Microsemi MicroNotes Series 050 -

page 14).

separately. Each block connects the addressed channel to two outputs, "Output" and "Current".

This technique enables selecting and reading a remote resistive sensor without the MUX

resistance being part of the measurement. For grounded sensors, this is done by passing

current to the sensor by means of the "Current" pin and reading the resultant voltage

(proportional to the sensor resistance) at the "Output" pin.

NOTE: It is recommended that all "NC or "no connect pin", be grounded. This eliminates or

minimizes any ESD or static buildup.