April 20, 2005
Super B Factory Workshop, Hawaii
Peter Križan, Ljubljana
VA64TAP is a low-power, low-noise ASIC with 64 channels, each with:
● preamplifier (ENC ~ 500 @ 10 pF)
● amplifier (can be switched off)
● fast CR-RC shaper (75 ns)
● discriminator with 4-bit trim-DAC
● threshold uniformity: +-200e-
● threshold nominal value: 3000e-
● power: 2.3 mW/ch.
● parallel output
● die size: 5.5mm x 5.4mm
Auxiliary chip LS64: logic level adapter, converts current logic (from VA64TAP) into CMOS logic (0V, 2.5V - 5V).
Same lateral dimensions, direct channel to channel bonding to VA64TAP
VA64TAP: backup read-out electronics