NASA Office of Logic Design

NASA Office of Logic Design

A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.


MESSENGER

Mercury Laser Altimeter
Analog Card

 

Analogaftercoat122002.jpg (701650 bytes) Analogfrontaftercoat122002.jpg (700111 bytes) Post-Coat and Stake
December 20, 2002

 

Mass ~93.6g
Power
+5 VDC: 18 mA
-5 VDC: 16 mA
Functions Telemetry points: power, threshold, and gain control voltages, temperatures, laser diode pump current, laser TX pulse energy. Threshold voltage outputs: 5 channel thresholds including TX timing channel. Gain control voltage output.
Performance All telemetry to 8-bit resolution. Temperatures calibrated from -30 to +70C; readings from -40 to +80. Threshold resolution: 10ns: .25mV; 60ns: .5mV; 270ns: 1mV. Gain control range: .1 to 10. Threshold-generation DAC latchup mitigation removes latchup condition within 200us.
Design/Analysis Team Jerry Karsh, Mike Solly
PCB Layout Roy Jones
Assemblers Rani Lavu, Alice Snively, Dorrie Hall
Polymerics Jim Cook, John Grondalski
Quality Assurance Frances Famous, Shirley Paul, Keith Corsi

Home - NASA Office of Logic Design
Last Revised: February 03, 2010
Digital Engineering Institute
Web Grunt: Richard Katz
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