The Mod. V965 is a 1-unit wide VME 6U module housing 16 Charge-to-Digital Conversion channels with current integrating negative inputs (50 Ohm impedance). For each channel, the input charge is converted to a voltage level by a QAC (Charge to Amplitude Conversion) section. Each QAC output is then converted by two ADCs in parallel; one ADC is preceded by a x1 gain stage, the other by a x8 gain stage: a dual input range is then featured: 0 ÷ 900 pC (200 fC LSB) and 0 ÷ 100 pC (25 fC LSB); this allows to avoid saturation with big charge pulses while increasing resolution with small ones.

The outputs of the QAC sections are multiplexed and subsequently converted by two fast 12-bit ADCs. The ADCs use a sliding scale technique to improve the differential non-linearity. Programmable zero suppression, multi-event buffer memory, trigger counter and test features complete the flexibility of the unit.

The module works in A24/A32 addressing mode; the data transfer occurs in D16/D32/BLT32/MBLT64. The module also supports the chained block transfer (CBLT32/CBLT64) and the multicast commands.

The board supports the live insertion that allows inserting or removing it into the crate without switching it off.

Please refer to the manual for more details.

V965 Data Record format

The data records for the CAEN cards is exactly as produced by the cards with the addition of a header that 'wraps' the data for ORCA. It is a variable length record. Only the long form is used. The format is:

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

^^^^ ^^^^ ^^^^ ^^-----------------------Object ID (from header)

-----------------^^ ^^^^ ^^^^ ^^^^ ^^^^-n longs + 2

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

^^^^ ^^^^-------------------------------spare

----------^^^^--------------------------crate

---------------^^^^---------------------card

--------------------^^^^ ^^^^ ^^^^ ^^^^-spare

n longs of data follow immediately. The format

is as described in the card's documentation.