v6-0 to v6-1 changes

Introduction

To improve the reliability and stability of the FMC ADC 100M, some components need to be changed. It solves the problem that some capacitors are not enough derated in their operating voltage (and this has indeed given troubles by capacitors that became resistive after a few years of operating). See Issue 66.

Secondly it solves the problem that the LDO had an output capacitor that had in the end a too low capacitance. The reason is that the used capacitor has a much lower capacitance than specified if it is used at a lower operating voltage than it is specified for. See Issue 65.

See also Fmc adc 100m adc_power_noise_measurements

Required changes

1. Replace the following 16 capacitors by a 10uF +/-10% 16V 0603 X5R or similar specified capacitors.
   The Murata GRT188R61C106KE13 is the type that will be used in our 2022 upgrade program.

   • C47, C49, C56, C58, C64, C66, C72, C74, C76, C83, C87, C90, C93, C99, C100, C103

2. Replace L8 by a 0 Ohm 0805 jumper.

17 June 2022