LArPix-v2: Connectors and Cabling Discussion Dan Dwyer (LBNL) Jul. - - PowerPoint PPT Presentation

Dan Dwyer (LBNL)

• Jul. 18, 2019

LArPix-v2: Connectors and Cabling Discussion

V2 Pixel Tile: Mechanical Design

• Jul. 18, 2019

LArPix-v2: Cables and Connectors

Draft mechanical design for integration with 2x2 Demonstrator

(K. Skarpass)

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Connector edge V2 Pixel Tile ArgonCube Module

Connector/Cable Requirements

• Jul. 18, 2019

LArPix-v2: Cables and Connectors

Rough needs for connectors/cables for 2x2 Demonstrator

Independent cable (bundle?) from each tile to flange à allow independent depowering of tile

4 cables per module corner, 16 cables per module

Proposed Cable budget (per tile):

N Ground 4 Power (VDDA x2, VDDD x2) 1 Analog Monitor 1 ADC Test 1 Reset-Sync 1 External Trigger 2 Clock/Anti-Clock 16 Data I/O (4 MOSI/MISO pairs) 26 + NGnd Total conductors à Suggests 32-pin connector?

Length: ~1 m minimum to ~2 m maximum, depending on tile vertical position in 2x2 module Thermal: 87 K to room temp Chemical: Compatible with high-purity LAr (doesn’t emit electronegative impurities) Other: Negligible (<200 e- ENC) cross-talk from Clock, Data I/O to analog side (VDDA, Analog Monitor) Three options for Clock and Data I/O signals:

Option A: ‘LArPix-v2-I/O’

• Complementary CMOS (pseudo-differential), direct to/from ‘head node’ LArPix ASIC on tile

Option B: ‘Mitch-I/O’

• Custom discrete low-power LVDS to/from tile, small adapter circuit to/from ‘head node’ LArPix ASIC

(see last week’s presentation) Option C: ‘Carl-I/O’ - Integrated low-power LVDS to/from ‘head node’ LArPix ASIC.

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Net Voltage Other

VDDA +1.8 ~0.3 W/tile VDDD +0.8 to +1.8 ~0.3 W/tile Ana.Mon. 0 to VDDA

• ADC Test

0 to VDDA

• Reset

0 to VDDD CMOS, 5-10 MHz

• Ext. Trig.

0 to VDDD CMOS, 5-10 MHz CLK/~CLK 0 to VDDD See disc., 5-10 MHz Data I/O 0 to VDDD See disc., 5-10 MHz

Connector/Cable Implementations

• Jul. 18, 2019

LArPix-v2: Cables and Connectors

LArPix-v1 Approach:

Standard 0.1” two-row male header pin connectors 50-pin ribbon cable with 2x25 Female crimp connectors Advantages:

• Simple, cheap, functional

Disadvantages:

• Unknown cryo-longevity
• Susceptible to cross-talk
• Large size likely an issue for constrained ArgonCube 2x2 space

Some LArPix-v2 Options:

Option A: EXO approach (K. Skarpass)

• Etch/cut single-sided Kapton flex cables with desired geometry, bends
• PEEK flex cable connector

Option B: ProtoDUNE approach

• Custom LV twisted pair bundle or

data twin-axial cable bundles

• 40-pin Samtec connectors (?)

Option C: Other? Feedthrough: LArIAT-style

• PCB used as conflat gasket, feedthrough

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ProtoDUNE cables and connectors EXO cables and connectors

Twisted pair Twin-axial