The FMC-Pico-1M4 is a standard FPGA Mezzanine Card (FMC - VITA 57.1) Low Pin Count (LPC) board that allows to monitor bipolar currents up to 1 mA with high sampling rate and high resolution.
The bord resolution is 20 bit, obtained from independent, simultaneous sampling and low-delay Analog to Digital Converters (ADCs).
Each channel has two full-scale measuring ranges, up to ±1 mA and ±1 uA respectively and the current source can be floating up to ±300 V respect to the FMC ground. The floating capability of the inputs is perfectly suitable for applications where the detector or current source needs to be biased.
The analog front-end is designed in order to achieve low noise, low temperature dependance and very small unbalance between channels. The analog characteristics can be further improved by requesting a factory calibration of the channels - calibration data are stored in the on-board EEPROM memory that can be read via an I2C bus on the FMC connector.
A metallic shield has the dual function of shielding the analog front end from external noise sources and also isolates the internal electronics that could be floating up to ±300 V.
A trigger signal can be fed on the FMC connector in order to start the conversion of data samples: this feature allows to synchronize the board acquisition to an external event - e.g. machine revolution frequency in storage rings.
Data readout can be performed via separate SPI links - i.e. one for each channel, sharing the same clock signal.