A 1-GHZ FLASH-ADC MODULE FOR THE TAGGING SYSTEM OF THE CP-VIOLATION EXPERIMENT NA48

An 8-bit 1-GHz Flash-ADC module has been developed for the tagging sys tem of the CP-violation experiment NA48 at CERN. The module contains t wo independent channels with 500 MHz sampling rate, which can be inter leaved to obtain one channel with an effective sampling rate of 1 GHz. Both FADC chips run continuously and data samples are stored for 524 mu s in a ringbuffer memory until they are overwritten by new data. Du ring their ''lifetime'' data can be extracted from the ringbuffer with out disturbing the write cycles. The module fits into a VXI-D crate an d uses the VME bus. The design, construction, operation and performanc e of this module are presented.