1. Readout Electronics: SIDECAR ASIC Hardware

2. SIDECAR ASIC
Two sets of Control Electronics used: ARC and SIDECAR ASIC
SIDECAR has great functionality; very powerful chip
Challenge is to write assembly code to achieve functionality
SIDECAR FEATURES
36 Analog Inputs
20 Digital I/O Clocks
20 Output Biases
36 16 bit ADCs
36 12 bit ADCs
Taken from Loose et al. SPIE 2002
Taken from Loose et al. SPIE 2007

3. SIDECAR ASIC and H4RG HXRG ASIC JADE Computer
SIDECAR ASIC set up at Rochester Imaging Detector Laboratory
All Clocks and Biases probed during power-up and regular operation
No Voltages above 3.3 V
going to detector
SIMPLE INTERFACE
HXRG
Hirose Connector
ASIC
JADE
SIDECAR ASIC attached to an H4RG and connected to DELL Laptop with a USB cable
Have tested ASIC over 125 foot fiber/USB cable
Computer
USB Cable

4. External Electronics: Data from ASIC
CONFIG AND SCIENCE DATA
TO/FROM SIDECAR =
Spartan 3- FPGA
Xilinx Firmware written by Teledyne
JADE CARD
No Unix libraries or source code available for USB microcontroller!
Only precompiled .dll files containing classes.
EZ-USB FX2LP(TM) USB Microcontroller
Quick USB DLL written by Bitwise =
MICROSOFT COM FUNCTIONS
HalWrapper.dll written in C# and .NET
COMPUTER
IDE Written by Teledyne
IDL Code or
Other interface

5. Setup used at ESO - Cryogenic ASIC sits inside dewar
Figure taken from Dorn et al. Evaluation of the Teledyne SIDECAR ASIC…’, SPIE 2006
- Cryogenic ASIC sits inside dewar
Standard LGA socket packaging provided by Teledyne
JADE Card sits outside of dewar; JADE not used by SNAP team

6. Readout Electronics: SIDECAR ASIC
Firmware
Note: Fine details, likely not necessary for Corner Raft Meeting

7. SIDECAR Video Inputs SIDECAR ASIC has capacitively coupled inputs
Capacitive feedback used for gain
Leakage currents cause voltage at node to rise
Very noticeable at room temperature
Must reset capacitors periodically to prevent large rise
Problem: kTC noise
Amplification – S3 and S6 are open
Special sample and hold circuitry able to sample voltage on Cfb as reference

8. kTC Noise Removal
Reset PreAmps once per frame Drift of voltage is apparent over the frame Reset PreAmps once per row Different voltage due to kTC noise appearing on caps is visible from row to row Reset PreAmps once per row with kTC removal Row to row noise is eliminated

9. SIDECAR ADC Averaging Noise of ADCs is ~2 ADU
To beat it down, average input on multiple ADCs
Input Routing Mux allows you to sample one input on 1-8 channels
Simplified Portion of Routing Mux
Detector Video Output
Channel 7
Channel 6
Channel 5
Channel 4
Channel 3
Channel 2
Channel 1
Channel 0

10. ADC Averaging Results Noise goes down as 1/ as expected
Only works if 4 or less outputs of HxRGs are used
Second generation of SIDECAR ASIC expected to have lower noise