Vega replacement Summary Statement of Work.docx

Summary Statement of Work

1. HARDWARE DESIGN

· Custom motherboard compatible with a Vega board, with form factor, connector and mounting hole locations to match a Vega board.

· Power supply design, including switching and linear regulators, to power the board and provide +5V to the PMT.

· PMT control circuit design: 0 to +2.5V 16-bit voltage DAC, software controlled via I2C from the board.

2. FIRMWARE DESIGN

· 80 MSPS sampling rate, RC tail pulse processing, and on-board USB communications (mini-USB connector).

· Allow custom spectrum sorting based on input GATE signal

3. SOFTWARE DESIGN

· Update Handel DLLs to support multi-spectrum readout from compatible board.

· Incorporate updated ProSpect sofware for multi-spectrum display, and add setting for PMT control voltage.

Draft Specifications

1. Physical

· Board Size: 5.2” x 2.632”. Analog input and detector control connectors are located at one end, and USB connector, input power, and digital I/O connectors are on the other end.

· Fixing locations same as a Vega board.

· Board thickness: 0.0625” nominal

· Maximum component height: Similar to a Vega board.

2. Connectors and Switch

· Detector Header: 6 pin shrouded header, compatible with a Molex part number 90136-1106.

Note: 1V 1kV on PMT

· Alternate Detector Input: SMA (connects directly to PMT anode signal)

· USB: mini-USB connector

· Logic I/O: LEMO Type 00 connectors, right angle. Used for GATE and SYNC inputs.

· Power Input Jack: Switchcraft RAPC722 or equivalent

· Power Switch: compatible with NKK 633-G22AV SPDT

3. Power Requirements

· 6V, 2 Amps.

· Compatible power supply: CUI Model EPAS-101W-06

· +/-5V analog, 3.3V, 2.5V, 1.8V generated onboard.

4. Analog Input

· Impedance: 50 Ohm for PMT input.

· Gain: Software controlled variable gain ranging from 1.22 to 23.04. Circuit is designed to accept positive or negative pulses.

· Offset: 16-bit DAC can compensate for a DC offset between -2.2V and +2.2V

· ADC Input Range: 2.2V, differential.

· DC Input Range: Similar to a Vega board.

5. ADC and Digital Circuitry

· 14-bits, 80 MHz

· Digital filters, peak detection, pileup inspection implemented in circuitry compatible with in Xilinx Spartan6 FPGA

· MCA implemented in Analog Devices compatible with ADSP2185M

· USB2 interface implemented with Cypress FX2 compatible Microcontroller. Maximum burst transfer rate is approximately 16 MB/sec.

6. MCA Features

· Supports two 2k channel (up to 4K) MCA spectra

· Three byte word depth (up to 2^24 counts per channel)

· The digital GATE signal determines which spectrum is filled. GATE = LOW NonGated spectrum, GATE HIGH, Gated spectrum.

· Separate statistics are stored for each spectrum, allowing for separate pileup correction.

7. Usage

· The Vega replacement can be used with any detector that produces a voltage or current pulse with an RC-decay.

· The analog gain is software adjustable