| | 1 | This page documents a proposed 12-bit WFD for PMT pulse digitization. |
| | 2 | The goal is initially to engineer an ADC/FPGA/memory block which is |
| | 3 | relatively straightforward and which could be replicated to produce |
| | 4 | a multi-channel unit with a (unspecified as of now) computer interface. |
| | 5 | |
| | 6 | Some guideline specs for a production unit: |
| | 7 | |
| | 8 | * 12 or more bits resolution |
| | 9 | * 250MSPS or faster digitization |
| | 10 | * Front-end with 250MHz bandwidth to support interleaving |
| | 11 | of two FADCs at 500MSPS (or 500MSPS ADC). 12 bit analog performance, |
| | 12 | capable of 0.1mV least count operation. |
| | 13 | * generic memory interface (SDRAM) capable of 2x ADC speed |
| | 14 | (500MB/sec) throughput. |
| | 15 | * 50 ohm single-ended DC-coupled analog input, with adjustable gain |
| | 16 | and DC offset. |
| | 17 | * Baseline adjust such that both negative-going and positive-going |
| | 18 | signals can be accommodated |
| | 19 | * Convenient mechanism to combine multiple channels to extend |
| | 20 | dynamic range in pulse height or time (interleaving). |
| | 21 | |
| | 22 | I would suggest an initial prototype with the following characteristics: |
| | 23 | |
| | 24 | * 50 ohm input, providing 0-4.095V (1mV/count) and 0-409.5mV (0.1mV/count) |
| | 25 | ranges. |
| | 26 | * On-board digitizer clock source, with external (sine wave) clock option |
| | 27 | * Suitable FADC and FPGA (Xilinx) |
| | 28 | * SDRAM with sufficient bandwidth |
| | 29 | * Ethernet (or USB-2) interface |
| | 30 | |
| | 31 | ''''1GSPS and Beyond''' |
| | 32 | |
| | 33 | * [http://www.ti.com/product/adc12d500rf ADC12D500RF] |
| | 34 | * [http://www.ti.com/product/ads5400 ADS5400] |
| | 35 | * [http://www.ti.com/product/adc12d1000 ADC12D1000] |
| | 36 | * [http://www.ti.com/product/adc10d1000 ADC10D1000] |
| | 37 | * [http://www.maxim-ic.com/datasheet/index.mvp/id/2026 MAX104] |
| | 38 | * [http://ohm.bu.edu/~hazen/DataSheets/E2V/EV10AQ190(2).pdf EV10AQ190TPY] |
| | 39 | |
| | 40 | |
| | 41 | ''''Candidate ADCs''' |
| | 42 | |
| | 43 | * [http://www.atmel.com/dyn/resources/prod_documents/5412s.pdf AT84AS001] |
| | 44 | • [http://www.e2v.com/products/ccd-and-cmos-imaging-and-semiconductors/broadband-data-converters.cfm now e2v] |
| | 45 | • 5/09 Arrow $163 ea |
| | 46 | * [http://focus.ti.com/lit/ds/symlink/ads5463.pdf ADS5463] |
| | 47 | sample received. ($135 ea @ 1k per TI website 3/2012) |
| | 48 | * [[500MSPS_Prototype]] |
| | 49 | * [http://focus.ti.com/docs/prod/folders/print/ads5444.html ADS5444] (13 bits, 250MSPS) - stock on 8/23/06 ($76 ea @100) [[have_samples]] |
| | 50 | * [http://focus.ti.com/docs/prod/folders/print/ads5440.html ADS5440] |
| | 51 | * [http://www.analog.com/en/prod/0%2C%2CAD9230%2C00.html AD9230] |
| | 52 | * [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4768 MAX1215] |
| | 53 | * [http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1155,C1001,C1150,P19597 LTC2242-12] (12 bits, 250MSPS) [[have_samples]] |
| | 54 | |
| | 55 | ''''Other Parts''' |
| | 56 | * [http://focus.ti.com/docs/prod/folders/print/ths4509.html THS4509] wideband differential op-amp [[have_samples]] |
| | 57 | Recommended to drive ADS5444. '''As of 4/5/07:'' THS4509RGTT 163pcs stock at Digikey 8.30 |
| | 58 | in small qtys, 5.60250 100pcs other distributers have stock as well |
| | 59 | |
| | 60 | === Existing Products === |
| | 61 | |
| | 62 | * [http://www.acqiris.com/ Acquris] |
| | 63 | * [http://www.acqiris.com/products/digitizers/12-bit-cpci-6u-digitizers/dc440.html DC440] |
| | 64 | |
