Aeroflex Circuit Technology

SCD8500 REV C 10/10/01 Plainview NY (516) 694-6700

3

Organization and Application

The ACT8500 consists of six 16 channel muxes arranged as shown in the Block Diagram. The

ACT8501 design is inherently Radiation Hard due to the HS1840RH Multiplexers as well as

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

14).

A Section

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.

B Section

separately. Each block connects the addressed channel to one output.

By paralleling the channel inputs and enables, this section can be converted to act like one of

the 16 channel blocks of the A section.

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

minimizes any ESD or static buildup.