FMC Analog to Digital Converter developments
CERN's user needs are compared to define the specifications of the ADC cards to be developed. Main input is coming from Stephane Deghaye.
Specification
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| FmcAdc100M14b4cha | FmcAdc100M14b4chb | FmcAdc100M14b2cha | FmcAdc100k14b8cha | FmcAdc100k14b2cha |
|-==========================================================================================================================================================================================================================-|
| | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| | jumper settable gain | autocal (offset, gain) | jumper settable gain | autocal (offset, gain) |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| bits/sample (effective) | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| Offset step size | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| max. input voltage offset | max. 15 mV | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| External trigger | TTL (0.7V) | TTL (0.7V) | TTL (0.7V) | TTL (0.7V) |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| External clock | via FMC carrier | via FMC carrier | via FMC carrier | via FMC carrier |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| Connectivity | FMC/FMA/MMCX? | FMC/FMA/MMCX? | Fanout cable | FMC/FMA/MMCX? |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| SNR | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| Crosstalk | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| | | | | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| Notes | Cancelled development | Should be able to replace SIS modules | Priorities: 1) input impedance programmable, 2) autocal, 3) offset autocal, 4) gain autocal | |
|=----------------------------*-------------------------*-----------------------------------------*-----------------------------------------------------------------------------------------------*-------------------------=|
| | | | | |
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| Notes |
|-===========================================================================================================-|
| Would be nice if SW could detect jumper settings. |
|=-----------------------------------------------------------------------------------------------------------=|
| Would Stephane need a sweeping (unstable) clock? This would not be possible to implement with serial ADC |
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> -----Original Message-----
> From: Stephane Deghaye
> Sent: Thursday 03 December 2009 17:36
> To: Erik Van Der Bij; Maciej Fimiarz; Javier Serrano
> Subject: RE: FMC ADC OHR page
>
> Without meeting:
>
> The offset could dependent on the full-scale (this is the
> usual case). However, if that can be done easily, a offset
> bigger than the full-scale is very convenient. Remember the
> example of the signal where the operation is interested by
> the full shape and the crest value. The bigger offset allows
> us to use a small full-scale (e.g. 1V) and still move the
> acquisition window on the top of the signal (e.g. +9V).
>
> I'll try to find out:
> - Typical full-scale (need to have a look at the global
> configurations)
> - Typical offset
> - Typical values of RF signals (not LLRF), CVORB/G, GFAS, PO
> (pulsed converters), kickers...
> - Typical sweep for external sampling frequencies (e.g. 96
> MHz in CTF).
>
> Cheers,
> Stephane
Status
- 30-11-2009 - FmcAdc100M14b4cha had too much SNR. Rethink user needs (e.g. programmable offset instead of programmable gain
- 2-12-2009 - Meeting with S. Deghaye on needs for ACCOR
-- ErikVanDerBij - 04 Dec 2009