THE DAC for the ATLAS ELMB

Page updated: 6 Nov. 2002
Finished

The following people have made a contribution to this project:

Design:	Paul Timmer,    Daniel Tascon Lopez,    Bjorn Hallgren
Realization:	Daniel Tascon Lopez
PCB layout:	Piet de Groen
Measurements:

Status of the project

-The schematic of the 16-channel current-output DAC iscomplete.

-The electronics of the output circuit has been tested.

-Temperature characteristics of the output circuit has to be tested

-The PCB layout is finished.

-Two PCB's has been made

-The first proto-type has been build and tested

-All the relevant documentation is available

ELMB + ELMB-DAC	This is a block schematic overview of the ELMB with the ELMB-DAC connected to it.
The ELMB DAC	Description of the ELMB DAC and the output circuit
pdf file	price estemates ELMB-DAC
pdf file	schematic diagram of the ELMB-DAC
txt file	Net list of the ELMB-DAC
HTML file	Parts list of the ELMB-DAC
pdf file	connectors, jumpers and resistor values
ZIP file	Schematic and PCB layout in Ultiboard / Electronic Workbench format
ZIP file	PCB layout files: Gerber files of all layers with aperture table and drill files
Link to HB&B	The ELMB-DAC is supported by the ELMB software from Henk Boterenbrood

If we make 100 LMB-DAC's, the estimated price of one channel is 17.5 Sfr This high price is caused by the high price of the semiconductors and the PCB. The price of semiconductors is based on real citations of real suppliers. The price of the PCB is based on a rough estimate.

The spec's of the ELMB-DAC

Max number of DAC boards to one ELMB	4
Number of channels	16
Resolution	12 bits
Max. non-linearity
MAX525A	+/- 0.5 LSB
MAX525B	+/- 1 LSB
Absolute accuracy *	1 % or 0.1 %
Offset	6 mV or 2 uA
With internal power supply
Output voltage	0 .. 1 V
Output current	0 .. 1 mA
With external power supply
Output voltage	0 .. 5 V
Output current	0 .. 20 mA
With software offset	4 .. 20 mA

* Depends on the accuracy of the resistors.