APV Readout Controllers DAQ by Mikko Nykänen

Topic I try explain mainpoints of reading APV25-S1 chip in DAQ At begining I tell whole structure of DAQ, parts, main purpose and functions But main topic is APV chip and how we can adjust the timing in DAQ In APV we go through components, how much time is spend and what we can change in registers We also go throught little how we can change APV settings, mainly how mode affects to DAQ

ARCS Parts Control computer, with ISA Bus + PCMIO interface ARC Board Power +5V(1.5A) / -5V(0.15A) 2 x FE Adapters 2 x APV25-S1 chips Cables 50 pin, 2x20pin, and 2 APV and power cables

ARC Board Rate 20/40MHz 6 Channels Resolution 8bit Memory 8K x 8bit per channel External (NIM) or Internal trigger (software) Internal clock 40MHz or External up to 40MHz Expansion port Clock, trigger, synchronised trigger and APV trigger

Hybrid I/O 6 differential voltage -> 6 APVs in one port 50 Ohms resistance 3 Standard Buffered I2C 2 LVDS clock and 2 LVDS trigger lines Dimensions 19” crate or Double Euro Format

ARC – Block diagram Trigger&Clock Group 1&2 Local crystal oscillator, software/external trigger -> synchronised to system clock Trigger is distributed via link or missing clock pulses Group 1&2 2 groups of 3x8bit FADC For correct sample timing ->tune FADC clock 0-10x1.7ns Data is stored in 8Kbyte RAM in each channel Data lenght

Slow control LV control 2xI2C controller Hydrids powered by FE boards On/off switch if nessacery Hybrid currents are monitored by third I2C control

Address By using address via PCMIO you can read or write data in board or in APV Next colum tells what you can see in address Status register Write DAC/ Read RAM Write memory/soft trigger Write APV trigger data Slow control ADC clock delay Write stop address Write RAM data

Software ARC use LabView program Userfriedly program and easy to use But to main point in this prensentation DAQ For timing is the ADC clocks value important In APV register you can also change timing by changing latency But most important thing in DAQ is what is the mode in APV

APV25 Register In program you can change preamplifier, sharperer, bias current and few other values Latency is one of the value here E.g if you put latency to 132 you get 3.3us delay Mode Defines how APV behaves alltogether

Mode selection Basically you put value to mode and you are happy, not quite Mode number is based on 6bit number and when you select in table what you want to APV to do we calculate the numerical value

Mode register This picture is from APV user guide 2.2 So you select how the measurements are done and then put the to mode

APV25-S1 Analogue pipeline ASIC Idea is to process data prior to sending it APV chip has following parts: preamplifier, sharper, 192 column analogue memory(buffer) When APV collects data to buffer it can keep history of earlier events. In one channel there is data for last 4us period in pipeline. (25ns x192) Sharper and preamplifier use 50ns

Main point in APV is the buffer Main point in APV is the buffer. Data in there does not over write we make flag that is ready -> timing should be easy APV is ready to take data around every 5-6us This makes the chip dead-timeless, so even fast it can collect events quite efficient

Timing In software you can change two values. 1. is the latency in APV register(chip) 2. is the ADC clock, is used to fine tuning DAQ You should keep mind that when the trigger signal comes the DAQ starts after 70/35 clock pulse around 1.6-0.8us System clock 40MHz -> 25ns Delays from cables is not taken account

Times ADC clock 0-17ns APV register: Latency You can change this on fly and you can seek best position to collect data from screen Can be changed by moving the lever in ARCS software APV register: Latency Here you cant go over value 160 in settings Input value in APV register, latency Value 0 to reasonable 132, 0-3.3us delay

Few words We went through main points Soon I do better one presentation/ document and there I include more exact data and calculations Final goal is to make manual, how to build this system and how to use it. What tests does How settings affect to results But programs manual does this also so have to think different approach->to maybe find a way optimace latencys and delays Give working test setup and good manuam with it