FMC-PICO-1M4

4-channel FMC - VITA 57.1 Low Pin Count (LPC) board for high precision low current monitoring

The board resolution is 20 bit, obtained from independent, simultaneous sampling and low-delay Analog to Digital Converters (ADCs) running at up to 1 MSPS.

Each channel has two full-scale measuring ranges, up to ±1 mA and ±1 µA (10 kHz bandwidth) for the FMC-PICO-1M4 version, up to ±110 µA and ±3 µA (35 kHz bandwidth) for the FMC-PICO-1M4-C1 version, up to ±10 mA and ±500 µA (300 kHz bandwidth) for the FMC-PICO-1M4-C3 version, up to ±1 mA and ±20 µA (200 kHz and 160 kHz bandwidth respectively) for the FMC-PICO-1M4-C4 version, up to ±10 mA and ±2.5 µA (300 kHz and 20 kHz bandwidth respectively) for the FMC-PICO-1M4-C5 version, up to ±1 mA and ±1 µA (25 kHz bandwidth respectively) for the FMC-PICO-1M4-C6 version, 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 dependence 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.

Channels can 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.