SCD8540 Rev A

RHD8540 64-Channel Analog Multiplexer

GENERAL DESCRIPTION

Aeroflex’s RHD8540 is a radiation hardened, single supply, 64-Channel Multiplexer MCM (multi-chip module). The

RHD8540 design uses specific circuit topology and layout methods to mitigate total ionization dose effects and single

event latchup. These characteristics make the RHD8540 especially suited for the harsh environment encountered in

Deep Space missions. It is available in a 96 lead High Temperature Co-Fired Ceramic (HTCC) Quad Flatpack

(CQFP). It is guaranteed operational from -55°C to +125°C. Available screened in accordance with MIL-PRF-38534

Class K, the RHD8540 is ideal for demanding military and space applications.

ORGANIZATION AND APPLICATION

The RHD8540 consists of four, single supply, 16-Channel Multiplexers arranged as shown in the Block Diagram. The

RHD8540 design is inherently radiation tolerant.

are readily tolerated. There is no sensitivity to low-dose rate (ELDRS) effects. SEU effects are application dependent.

A SECTION

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 multiplexer 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

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.

www.aeroflex.com/RHDseries

Standard Products

April 1, 2015

FEATURES

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64 channels (32 Kelvin measurement channels) provided by six 16-channel multiplexers

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Single power supply operation at +3.3V to +5V

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Radiation performance

- Total dose:

>1Mrad(Si), Dose rate = 50 - 300 rads(Si)/s

- ELDRS Immune

- SEL Immune:

- Neutron Displacement Damage:

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Full military temperature range

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Low power consumption < 33.6 mW

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CMOS analog switching allows rail to rail operation and low switch impedance

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Designed for aerospace and high reliability space applications

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Packaging – Hermetic ceramic

- 96 leads, 1.320"Sq x 0.200"Ht quad flat pack

- Weight - 15 grams max

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Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.

Datasheet

RadHard-by-Design

32-Channel Kelvin Measurement Configured