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Entry  Thu May 8 23:23:19 2025, Jonathan Bradshaw, Clarification of full channel readout Screenshot_2025-05-09_093332.png
    Reply  Fri May 9 08:26:17 2025, Stefan Ritt, Clarification of full channel readout 
Message ID: 918     Entry time: Thu May 8 23:23:19 2025     Reply to this: 921
Author: Jonathan Bradshaw 
Subject: Clarification of full channel readout 

Hi all

We're working on a new product using the DRS4 IC, and want to do a full readout from cell 0 (not just Region of Interest).  I have a couple of questions I hope you can help me with:

  • We plan to do a full readout sequence, starting at cell 0.  Part of that sequence includes pulsing RSRLOAD and reading out the stop position as shown in v0.9 datasheet Figure 15.  What should the DRS4 address bits A3..0 be set to for reading out the stop position?  (I’m assuming it’s 1011 ‘Address Read Shift Register’)
  • What is the output delay from the falling edge of SRCLK to valid data at SROUT?
  • For channel readout, we pulse SRCLK to advance the read shift register.  The diagram shown in v0.9 datasheet Figure 12 appears to show that the analog output is updated on the rising edge of SRCLK. Is this correct or have I misread the diagram? (Other shift register transfers are clocked on the falling edge
  • The DRS4 v0.9 datasheet Figure 7 shows that the Configuration register is clocked on the falling edge of SRCLK.  Just below that is the text “The new register content becomes immediately active at the eighth rising edge of the SRCLK signal.” Should that perhaps read ‘… the eighth falling edge of the SRCLK signal’?
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