1. MONSOON IR Acquisition Aladdin Front End

2. Aladdin Front End Test Results 1 k  external load, BW = 7 MHz No filtering/bypassing of OFFSET ADC input adjusted with OFFSET to low level Histogram means are normalized to 50 ADU Ave. mean = 7,498 ADU Ave. s.d. = 2.37 ADU ADU Channel # Counts

3. Aladdin Front End Test Results 1 k  external load, BW = 7 MHz No filtering/bypassing of OFFSET ADC input adjusted with OFFSET to high level Histogram mean is normalized to 50 Ave. mean = 59,566 ADU Ave. s.d. = 2.36 ADU Histograms less smooth at high input level

4. Aladdin To Orion Front End Changes 100 k  internal load resistor increased to 10 M  Bipolar input AD8021 op amp replaced with FET input OPA627 Large 2.2  F bypass capacitor placed on incoming OFFSET Gain reduced from 3.0 to 2.5 BW reduced from 7 MHz to 3 MHz.

5. MONSOON IR Acquisition Orion Front End 2.500 V REF 4.7 uF

6. Orion Front End Test Results 1 k  external load, BW = 6 MHz OFFSET bypassed with 2.2  F. ADC input adjusted with OFFSET to low level Histogram mean is normalized to 50 Ave. mean = 7,501 ADU Ave. s.d. = 1.68 ADU Channel # ADU Counts

7. Orion Front End Test Results 1 k  external load, BW = 3 MHz OFFSET bypassed with 2.2  F. ADC input adjusted with OFFSET to high level Histogram mean is normalized to 50 Ave. mean = 57,810 ADU Ave. s.d. = 1.72 ADU Smoother at high level input than Aladdin

8. MONSOON IR Acquisition Current Tests ADC input voltage vs. Offset code Histograms of 1 k  input load to ground for low/high level offset. Histograms of D.C. input for low/high levels Histograms of dynamic step input on even/odd channels Sinewave input to get frequency spectrum Sinewave input to get DNL, and maximum INL

9. Orion Test System 1 IR Acquisition mother and daughter board in test. 1 IR Acquisition mother and daughter board nearly complete pending test results of first board. 1 Clock and Bias board 80 % done. Chassis and CPCI backplane integrated. Power supplies on hand.

10. MONSOON IR Acquisition Conclusions/Concerns About 1.7 ADU noise performance with Orion design for static 1k  source. Orion design BW = 3 MHz greater than necessary for Orion’s 1.5  sec pixel time @ 10 fps. Histograms become jagged at higher input levels. Unable to fit recommended Vref capacitor (47  F) for AD7671 on board.