Parts on Detail

Diamond Detector Secondary Shower Acquisiton System

ICECAL_V3 Mezzanine > ADC41240 and THS4521 Dynamic Performance

1. Parts Tested

THS4524: Fully differential Rail-To Rail Output ampliffier (TID = 1kGy)

ADS41240: Quad 12Bit 40MSPS ADC with parallel LVDS outputs. (TID = 10MRad)

Procedure:

A 1.7Vpp sinusoid (to cover the complete ADC dynamic range 4095 counts) is injected in each ampliffier input, the THS4524 drivers on the board have been configured to perform single to differential conversion as shown on the schematic bellow. Parameters such as SNR, SINAD or ENOB will be analised.

Driver.PNG

Setup2.PNG

2. The Set-Up

The function generator used is Techtronics AFG3252, with 50 ohms output impedance. Each ADC driver has 50 ohms input impedance, however the set-up is not fully adapted since the splitter used is just a set of Lemo Tees. The function generator "sees" a load of four 50 ohms systems placed in parallel --> 12.5 Ohms. The scope signal is directly injected on the adc drivers, there is no filter to remove signal harmonics.

Set-Up_Dynamic.PNG

3.ADC Dynamic Parameters

Input Signal 1 Khz , Input Signal 2.5 Khz, Input Signal 4KHz, Input signal 1 MHz, Input signal 2.5 MHz, Input Signal 4 MHz, *Input Signal 10 MHz *

ADC Dynamic parameters for 2.5MHz Sinusoidal Input:

ADC_2.5MHZ.png

3.1. Graphical Summary of ADC Dynamic Parameters

Summary.PNG

Summary2.PNG

*DS : Information from K.Kloukinas et al 2005. Characterization and production testing of a quad 12 bit 40 Ms/sec A/D converter with automatic digital range selection for calorimetry.

4. Noise Distribution

The board was connected to an Tektronix AFG3252, with the F.Generator powered off, a window of 250us is taken per channel (10000 points per channel @ 40MSPS) and the noise distribution of the ADC and drivers checked with an histogram.

Noise_OFF.png

Considering that the ADC Vdiff = 1.8V and LSB = 4.39e-4 V

  • Noise sigma ~ 0.35 mV

5. Linearity Check with F.Generator using a Ramp

A triangular waveform is introduced on the four channels in parallel with the F.Generator Tektronix AFG3252. Only the first ramp signal from 0 to 4095 in the time domain has been considered for a linear fit, giving as a result a linear sweep in signal amplitude. A linear fit is performed on this segment of signal, the residuals of the fit in ADC counts show the approximated linearity of the ADC and Drivers.

Relative Linearity Error:

Linearity_Error_Relative.png

Absolute Linearity Error:

Linearity_Error_Absolute.png

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng ADC_10MHZ.png r1 manage 60.4 K 2016-02-12 - 10:30 UnknownUser  
PNGpng ADC_1KHZ.png r1 manage 57.8 K 2016-02-12 - 10:35 UnknownUser  
PNGpng ADC_1MHZ.png r1 manage 59.4 K 2016-02-12 - 10:22 UnknownUser  
PNGpng ADC_2.5KHZ.png r1 manage 57.7 K 2016-02-12 - 10:35 UnknownUser  
PNGpng ADC_2.5MHZ.png r1 manage 59.4 K 2016-02-12 - 10:24 UnknownUser  
PNGpng ADC_4KHZ.png r1 manage 57.3 K 2016-02-12 - 10:35 UnknownUser  
PNGpng ADC_4MHZ.png r1 manage 60.3 K 2016-02-12 - 10:29 UnknownUser  
PNGpng Driver.PNG r1 manage 41.4 K 2016-02-12 - 09:55 UnknownUser  
PNGpng Linearity_Error_Absolute.png r1 manage 92.3 K 2016-06-21 - 14:32 UnknownUser  
PNGpng Linearity_Error_Relative.png r1 manage 83.4 K 2016-06-21 - 14:32 UnknownUser  
PNGpng Noise_OFF.png r1 manage 26.7 K 2016-02-19 - 18:14 UnknownUser  
PNGpng Set-Up_Dynamic.PNG r1 manage 1431.7 K 2016-03-22 - 09:07 UnknownUser  
PNGpng Setup.PNG r1 manage 867.8 K 2016-02-12 - 09:30 UnknownUser  
PNGpng Setup2.PNG r1 manage 1298.8 K 2016-02-12 - 09:34 UnknownUser  
PNGpng Summary.PNG r1 manage 167.2 K 2016-02-16 - 09:20 UnknownUser  
PNGpng Summary2.PNG r1 manage 55.7 K 2016-02-16 - 09:22 UnknownUser  
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Topic revision: r7 - 2016-06-24 - unknown
 
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