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.


Mercury Laser Altimeter
Analog Card


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


Mass ~93.6g
+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

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Last Revised: February 03, 2010
Digital Engineering Institute
Web Grunt: Richard Katz