Changes between Initial Version and Version 1 of Fast_WFDs


Ignore:
Timestamp:
Nov 8, 2013, 10:17:54 AM (6 years ago)
Author:
hazen
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • Fast_WFDs

    v1 v1  
     1This page documents a proposed 12-bit WFD for PMT pulse digitization.
     2The goal is initially to engineer an ADC/FPGA/memory block which is
     3relatively straightforward and which could be replicated to produce
     4a multi-channel unit with a (unspecified as of now) computer interface.
     5
     6Some 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
     22I 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
     58in 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