Caen V1724 Series Technical Information Manual
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Document type: Title: Revision date: Revision:User's Manual (MUT) Mod. V1724 8 Channel 14bit - 100MS/s Digitizer 06/11/2007 7NPO: Filename: Number of pages: Page:00103/05:V1724x.MUTx/07 V1724_REV7.DOC 63 34Data converted by channel ADC are brought to the FPGA via a 2 bit BUS. Data transfertiming is provided by TRG-CLK; the available bandwidth is 200 Mb/s.The FPGA ROC handles 8 bit data. Data rate is ¼ of TRG-CLK. Chx DATA representsthe 8 MSB of the converted sample. Data from 8 channels are summed; each channelcan be enabled (see Analog Monitor Register at § 4.34) to participate or not to the sum.The sum value is provided on 11 bit; a positive/negative offset (also encoded on 11bit)can be added to the sum (there is a sign bit in the Analog Monitor Register AMR to selectoffset polarity). The sum value can be multiplied by a fixed factor (MAGNIFY x1, x2, x4,x8). The final result (11 bit dynamics) allows to drive the DAC. The DAC output has 1Vdynamics and drives 50 Ohm.3.7.3.1. Procedure to enable “Analog Monitor” modeIn order to enable Analog Monitor mode is necessary to:− enable the channels to send data to FPGA ROC, by setting to 1 bit 7 of ChannelConfiguration register (see § 4.12). If this bit is set the datum sent is always 0.− Configure the Analog Monitor register with the desired settings.− Enable Analog Monitor mode: set to 2 the Monitor Mode register.3.7.3.2. Applications examplesThese examples show the effect of the channel/offset/magnify parameters over MONoutput.Single channel amplified on 0-1 V dynamics:Fig. 3.17: Example of Magnify parameter use on single channelThe assumption is an input signal on CH0 using the whole dynamics. Only such channelis enabled for Analog Monitor; the triangular waveform is just as example. FPGA AMC ofCH0 sends 8MSB to FPGA ROC with 25 Mhz rate (one sample out of four). If no outputis added and MAGNIFY factor 1x, the DAC produces a copy of the signal on channel 0with 0÷125 mV dynamics (1/8 of DAC dynamics). If a larger dynamics is desired, it isnecessary increase MAGNIFY factor; with MAGNIFY 8x one channel covers all the DACavailable dynamics. |
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