SCD8502 Rev D
GENERAL DESCRIPTION
Aeroflex’s ACT8502 is a radiation hardened, multi-chip 48 channel multiplexer MCM (multi-chip module) with ESD protection for use in space
applications. All channel inputs have electrostatic discharge protection.
The ACT8502 has been specifically designed to meet exposure to radiation environments. The multiplexer is available in a 96 lead High
Temperature Co-Fired Ceramic (HTCC) Quad Flatpack (QFP) and is guaranteed operational from -55°C to +125°C. Available screened in
accordance with MIL-PRF-38534, the ACT8502 is ideal for demanding military and space applications.
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).
48 channels addressable by Bus A0~A3, in Three 16 channel blocks, each block enabled 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.
ACT8502 48-Channel Analog Multiplexer Module
Radiation Hardened & ESD Protected
FEATURES
Radiation Performance
- Radiation 300K(Si) Total Dose
- No Latch-Up or SEE to 120MeV/cm2/mg
Full Military Temperature Range
Low Power Consumption < 90mW
48 Channels Provided by Six (6) HS-1840RH Multiplexers
One Address Bus (A0-3) and Three Enable Lines
All Channel Inputs protected by ±20V Transorbs
Fast Access Time 1500ns
±35V Input Over Voltage Protection (Power On or Off)
Break-Before-Make Switching
High Analog Input Impedance (Power On or Off)
Dielectrically Isolated Device Islands
No Latch-Up
Packaging – Hermetic Ceramic Quad Flat Pack
- 96 Leads, 1.32"Sq x .20"Ht Quad Flat Pack
- Typical Weight 15 grams
DSCC SMD 5962-0323401KXC
*
NOTE: Aeroflex Plainview does not currently have a DSCC certified Radiation Hardened Assurance Program
* Not approved for RAD Hard Version of SMD at this time
Radiation information available upon request
June 29, 2004
www.aeroflex.com/RADHARD
Standard Products