ISUAL Spectrophotometer Electronics

C. Ingraham

2 NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham

SP Electronics Functions

• Integrate and Sample PM Tube Output• Send Digitized Samples Serially to MM• Create Sprite “Trigger” Signal• Set Trigger Threshold• Receive CDI Commands from DPU• Provide Connections Among SP

Subassemblies

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SP Electronics Block Diagram

Spectrophotometer Data Controller Block Diagram

(One Channel of Six)

SLOW

INTEGRATORADC

FAST

INTEGRATOR

MUX1-Hz Samples

To Mass Memory

10-kHz Samples

To Mass Memory

4 NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham

SP Electronics Interfaces

• Six Buffered Analog Signals from PM Tubes• Slow Serial Data to Mass Memory• Fast Serial Data to Mass Memory• CDI Commands from DPU• Sprite Trigger to DPU, MM• Six Lines to Stim LEDs• Six Filter Heater and Thermistor Connections• Two Survival Heater and Thermistor Connections• Electronics Power from Power Controller

5 NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham

SP Electrical (Analog) Board

• Mounts Between SP Left & Right Halves• Mostly Connections• Six PM Tube Output Preamps• Six Stim LED Connections• Six Filter Heater and Thermistor Connections• Two Survival Heater and Thermistor Connections• +/- 12 Volts Analog Power from Power Controller• Filter Heater Power from Power Controller• Survival Heater Power from LVPS

6 NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham

SP Digital Electronics (IDC)

• On IDC Board• Integrates Charge from PMT• Samples at 1 Hz and 10 kHz per Channel• 12-bit A/D Converter per Channel• Sends Serialized data to MM Buffers• Digitally Processes Selected Channel for

Sprite Trigger• Adjustable Trigger Threshold

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SP Electronics Development Status (1)

• Single-Channel Test Board Built– Analog Section Tested with PMT

– Digital Section Awaits FPGA

• SP Electrical Board Designed and Built• All EEE Parts Selected, Ordered, and

Received

8 NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham

SP Electronics Development Status (2)

• Drawings Released:– Electrical Board Outline (8621)

– Electrical Board Schematic (8623)

– Electrical Board BOM (8624)

– Electrical Board PCB Design (8625)

– IDC PCB Schematic (8544)

– SP Test Board Schematic (8646)

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SP Electrical Board Schematic

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SP Electrical Printed Circuit Board

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SP Circuits on IDC (1 of 2)

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SP Circuits on IDC (2 of 2)