CERN 1101701 V1 Preparation-SD22-v10 free download

File name 1101701_V1_Preparation-SD22-v10.pdf

AB-PO-HP/gf 31.8.2007 Setup of the 22-bit Delta-Sigma converter, v. 10.1 Objective The Delta-Sigma 22 bits, a third order modulator originally developed by John Pett, needs a few starting up adjustments, ageing and setup. It is only carried out once and the procedure is fully explained here. Further adjustments should not be necessary, but are replaced by a digital calibration explained elsewhere Tools required This procedure requires a 10 Volts reference (Metron PBC), an oscilloscope, a DVM (8.5 digits type HP 3458), a frequency/counter device, a soldering iron (SMD) and a set of precision resistors (E24 / 1206, SMD) from 1 to 30 Ohms. Normal lab tools will help, like screwdrivers and a pot-trimmer. A PC with SLAP running an FGC is necessary for the evaluation of the 500 kHz/1 MHz output data stream. Description of the subsystems There are two PCBs inside the module, the power supply card and the modulator card. The power supply provides +/-15V for the analog part, +5V for the digital control and +/-4Vfor the Peltier element. The